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Review

Multi-Objective Optimization Models to Design a Responsive Built Environment: A Synthetic Review

by
Mattia Manni
* and
Andrea Nicolini
Department of Engineering, University of Perugia, 06125 Perugia, Italy
*
Author to whom correspondence should be addressed.
Energies 2022, 15(2), 486; https://doi.org/10.3390/en15020486
Submission received: 22 November 2021 / Revised: 29 December 2021 / Accepted: 5 January 2022 / Published: 11 January 2022
(This article belongs to the Special Issue Life Cycle Thinking for a Sustainable Built Environment)
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Abstract

:
A synthetic review of the application of multi-objective optimization models to the design of climate-responsive buildings and neighbourhoods is carried out. The review focused on the software utilized during both simulation and optimization stages, as well as on the objective functions and the design variables. The hereby work aims at identifying knowledge gaps and future trends in the research field of automation in the design of buildings. Around 140 scientific journal articles, published between 2014 and 2021, were selected from Scopus and Web of Science databases. A three-step selection process was applied to refine the search terms and to discard works investigating mechanical, structural, and seismic topics. Meta-analysis of the results highlighted that multi-objective optimization models are widely exploited for (i) enhancing building’s energy efficiency, (ii) improving thermal and (iii) visual comfort, minimizing (iv) life-cycle costs, and (v) emissions. Reviewed workflows demonstrated to be suitable for exploring different design alternatives for building envelope, systems layout, and occupancy patterns. Nonetheless, there are still some aspects that need to be further enhanced to fully enable their potential such as the ability to operate at multiple temporal and spatial scales and the possibility of exploring strategies based on sector coupling to improve a building’s energy efficiency.

1. Introduction

Construction of buildings and infrastructure is a significant contributor to global warming, due to the high involvement of machineries, land use change, and material consumption. More than six tenths of the global energy consumption and around four tenths of greenhouse gases (GHG) emissions can be attributed to the building sector [1]. Following this, several countries such as Japan, Norway, and Sweden have adopted zero-energy building (ZEB) goals and policies, whereas many others such as Morocco, Germany, and Italy have established thermal regulations for buildings that identify minimum energy performance levels for new constructions [2]. Within this framework, the building energy efficiency topic has aroused the interest of several researchers around the world. Strategies to improve the energy performance of buildings have been proposed which apply passive (i.e., building shape and orientation, envelope properties, natural ventilation) or active systems and technologies (i.e., heating, ventilation and air conditioning system, photovoltaic systems). However, building performance covers many targets in addition to energy efficiency such as indoor visual and thermal comfort, and environmental and economic sustainability. When improving building performance, these aspects can conflict with each other [3] and it is necessary to seek a balance among them. Exploring all the alternatives to find an efficient design is a time-consuming task; therefore, many authors developed simulation-based optimization workflows which couple building performance simulation (BPS) tools with optimization algorithms [4]. Since multiple variables and objectives occur in complex optimization problems such as the integrated building design, non-gradient-based algorithms such as genetic algorithms (GAs) are exploited to solve these discontinuous objective functions [5]. Such multi-objective optimization (MOO) models are mostly applied during the early stage of the design process when even the less accurate analysis (building components and materials properties are not defined in detail at this stage) can have a significant impact.
Building performance optimization (BPO) can be considered as a MOO problem and the solution consists of the trade-off between the different identified objectives. However, when it comes to mutually conflicting objectives, a set of non-dominated solutions results, which constitute the Pareto front. The Pareto front grouped the optimal Pareto solutions, and it is n-dimensional, where n is the number of objective functions evaluated. Evolutionary optimization algorithms such as multi-objective particle-swarm optimization (MOPSO), strength Pareto evolutionary algorithm (SPEA2), and non-sorting genetic algorithm (NSGA-II) are widely used to solve multi-objective problems. In particular, the NSGA-II turned out to be the most appreciated when it comes to BPO due to its efficient sorting of non-dominated solutions which ease the convergence, and also its capability of well distributing Pareto-optimal solutions along the Pareto front [6,7].
Despite the proven advantages of using GAs, the optimization process tends to be difficult when BPS requires a lot of time (a large building or too many objective functions are considered). To overcome this issue, metamodels were introduced to predict building performance, after being appositely trained, with a lower computational time [8]. Metamodels consist of, literally, a model of a model which permits studying correlations between inputs and outputs observed in a more complex model [9]. When applied to BPS, the artificial neural network (ANN) metamodels are trained on the basis of a representative sample of results from building performance analyses (outputs) for various sets of design variables (inputs). Then, ANN metamodels are generally coupled to GAs in order to conduct BPO.
The integrated building design has been widely investigated over the last decades. The introduction of metamodels enabled solving more complex MOO problems characterized by numerous objective functions or large building case studies, with a relatively low computational time [10,11]. Within this framework, the present work aims at reviewing the state of the art concerning MOO models applied to the integrated building design for identifying knowledge gaps and future trends in this research field. The review study focuses on (i) exploited optimization tools and the respective programming languages, (ii) objective functions and their combinations, (iii) explored design variables, and (iv) the capability of evaluating long-term impacts. Outcomes will provide a background for future research works dealing with BPO by contributing to the definition of the most effective MOO workflow to be followed.
The paper is arranged into four sections: an introductive section (Section 1), which provides the background about the topic of this synthetic review; the Method (Section 2), in which the methodology followed is outlined; the Results and discussion (Section 3) which is divided into three Sections about the general description of the selected journal articles (Section 3.1), reviewed MOO models (Section 3.2), and identified knowledge gaps and future trends (Section 3.3); the conclusive section (Section 4), where the main achievements are reported in brief.

2. Method

A synthetic review was conducted to investigate the applications of MOO models to integrated building design. Scientific journal articles that focused on the optimization of building and neighbourhoods’ performances (i.e., energy and environmental impact, thermal and visual comfort, solar accessibility) were reviewed. Two databases were considered as the sources to find these journal articles: Scopus and Web of Science (WoS). These were chosen as they return literature from highly reliable sources with wide geographic coverage. Identical search terms were used in both the databases, whereas the research to acquire relevant journal articles was conducted in three steps. Initially, the “building”, “multiobjective” and “optim*” terms were searched in titles, abstracts, and keywords from papers collected in the two databases (step one). The Boolean Operator “and” was used to connect the search fields in all databases to ensure consistency of searches. The chosen search terms were found in around 2690 and 4180 journal articles in Scopus and WoS, respectively. The order of the terms within a search field was found to not alter the returned literature: for example, “building multiobjective optimization” and “multiobjective optimization building” returned the same publications. However, this search was deemed ineffective as it returned a wide range of literature with topics not pertaining to the exploitation of MOO models in the integrated building design. To narrow the results, the terms “design” and “architectur*” were used together with “building”, “multiobjective”, and “optimiz*” to acquire a focused set of literature for reviewing (step two). Search terms were refined with the help of the VOS Visualizer tool with the aim of providing a view of how MOO models are used throughout the building design process with an emphasis on architectural applications. Indeed, this machine learning-based tool ranks the words in the titles, abstracts, and authors’ keywords of the collected scientific journal articles and then applies clustering models to classify the most used words in groups (Figure 1). The consequent density visualization provided a quick overview of the main areas in the bibliometric network highlighting the presence of journal articles about optimization of mechanical components of systems and plants (i.e., turbines, engines, compressors). To further narrow the results, the typology of the scientific journal articles to be included in the present review was defined as “article”, thus excluding conference proceedings, books, and other review studies (step three).
The term “multiobjective” was chosen to capture the optimization studies which handle more than one objective function in their approaches. The use of “building design” returned more specific literature when compared with the results from the “building” search term, thus the former was used for this study. The “optim*” search term was chosen to capture “optimization”, “optimized”, and “optimizing” in relevant articles. The review includes articles published and available online between 2014 and the end of 2021. The search returned 367 unique journal articles, which went through a further screening process. The abstracts of all downloaded papers were reviewed to assess whether the papers had a “structural and seismic”, “energy and comfort”, “environment and economy” or “other” focus. Papers classified as “structural and seismic” discussed the optimization of structural properties and seismic resistance of buildings; “energy and comfort” focused on minimizing energy demand while enhancing visual and thermal comfort; “environment and economy” focused on life-cycle analyses concerning building’s carbon intensity and costs; and “other” did not focus on the built environment or had a scope not relevant to the other categories such as systems and plant sizing. Following the screening process, 141 journal articles that were classified with “energy and comfort” and “environment and economy” focuses were reviewed in detail.

3. Results and Discussion

3.1. General Description of the Selected Journal Articles

A tabular review is reported in the Appendix A section (Table A1) in which the year of publication, the case study location, the investigated building typology, the objective functions, the temporal horizon of the impact assessment, the exploited simulation engine, the applied optimization method, and the optimization variables are reported for each reviewed journal article.
The temporal distribution of the reviewed research studies is reported in Figure 2. The number of published journal articles concerning the application of MOO model to integrated building design was increased by ten times over the last seven years, from 3 journal articles in 2014 to 37 journal articles in 2021.
Most of the investigated case studies were located in China (26), Italy (12), and Iran (10) (Figure 3). Alongside these, up to 11 journal articles evaluated the effectiveness of the proposed MOO models at various latitudes through comparative analyses (“miscellaneous” category). Less than 10 publications were found for the other locations.
In the reviewed journal articles, the MOO models were exploited to BPO at various scales ranging from the neighborhood scale (3) to the test room scale (7) (Figure 4). However, such workflows were mainly applied to design highly effective configurations of residential (62), office (36), and educational buildings (17). Fewer studies focus on commercial (2), sport (2), and miscellaneous buildings (3), whereas up to nine publications dealt with other building typologies such as tourist centers and community spaces.
Implemented GAs were mostly used for solving optimization problems with two (92) and three objective functions (43). Only six publications proposed the simultaneous optimization of more than four variables. Enhancing building’s energy performance levels (EN category in Figure 5) was included among the research goals of more than one hundred studies (115), whereas guaranteeing adequate thermal and visual comfort conditions (THERM and DAYL categories in Figure 5) was searched by authors of 73 and 57 journal articles, respectively (Figure 5). Finally, up to 53 studies aimed at minimizing life-cycle costs and other economical parameters (LCC category in Figure 5), whereas only 25 studies evaluated life-cycle emissions (LCA category in Figure 5).
The analysis of the possible combinations of two objective functions (Table 1) highlighted that the minimization of energy consumption was carried out along with thermal comfort optimization in 60 studies, and with visual comfort optimization in 45 studies. Furthermore, energy-related objective functions were solved together with life-cycle cost minimization in 37 studies.
To solve the aforementioned objective functions, the main simulation engines which were found to be used in BPS are TRNSYS and EnergyPlus for thermal and energy analyses, and Radiance for daylight and solar radiation assessment. These were utilized through different tools such as DIVA, Ladybug and Honeybee for Grasshopper, DesignBuilder, and Autodesk REVIT. Moreover, life-cycle cost (LCC) analyses were conducted through numerical models implemented in Visual Basic for Applications (VBA) and MATLAB environment, whereas life-cycle assessment (LCA) was mainly performed by SimaPro software.
Python, MATLAB, and Java were the most utilized programming languages to develop optimization algorithms (Figure 6). Python-based tools such as Opossum, Galapagos, Colibrì, and Octopus were utilized within the Grasshopper environment. Similarly, jEPlus and Optimo (both programmed in Python) were coupled to EnergyPlus and Dynamo, respectively. MATLAB was exploited to perform optimization analyses together with TRNSYS, ANSYS, and EnergyPlus software, in 38 studies. Finally, GenOpt tool from Java was integrated with TRNSYS and EnergyPlus in 5 studies. Despite the programming language, the NSGA-II was the GA applied by almost all of the authors.
Almost the totality of the reviewed studies performed multi-objective optimization analyses over short-term temporal horizons. It is worth highlighting that the authors of three studies carried out BPS analyses throughout the building’s life cycle, thus taking into account both current and future climate scenarios.
When it comes to the optimization variables, the reviewed MOO models were capable of exploring different design solutions or strategies for the building’s orientation (40), window-to-wall ratio (WWR) (71), window typologies (84), building’s shape (21), insulation properties of the building envelope (86), infiltration rate (18), heating system layout (34), shading devices (40), exploitation of natural ventilation (20), exploitation of renewable energy sources (RESs) (19), lighting appliances (10), and occupancy pattern (8) (Table 2). Most of the studies optimized from one to five independent variables (125), whereas only 16 studies were handling more than five variables. In particular, geometrical and physical properties of the building envelope such as orientation, shape, the extension of the glazed surface, shading solutions, and thermal insulation level of both opaque and transparent components were optimized together. Among these, the window typology was generally optimized along with the insulation properties of the outer walls/rooftop (68) or the WWR (57), whereas the WWR was mostly optimized together with the envelope insulation (52).

3.2. Multi-Objective Optimization Workflows

3.2.1. Python-Based Workflows

Python programming language was found to be the most utilized in the reviewed journal articles. Python libraries such as Numpy and Pandas exist, which enable solving MOO problems [12]. Moreover, some Python-based optimization tools can be easily coupled to simulation engines such as Radiance and EnergyPlus. Numerous studies included Octopus [13,14,15] and other optimization tools from Grasshopper such as Galapagos [16,17] and Colibrì [3,18] into their workflows (Figure 7). Zhuang et al. [19] proposed a performance-integrated BIM framework for building life-cycle energy efficiency and carbon optimization (Table 3). Ladybug and Honeybee were coupled to Octopus to improve indoor environmental quality and reduce LCCs of an education building case study. Similar approaches were followed by Zani et al. [20] for designing an educational building in Italy, by Lobaccaro et al. [21] for achieving the zero-emission target in a residential building in Norway, and by Pilechiha et al. [22] for exploring highly energy effective configurations of an office building in Iran (Table 3). Through its plug-ins, Grasshopper allowed for investigating different aspects of buildings, thus enabling a high number of objective functions. For instance, the GA from Negendahl and Nielsen [23] was capable to handle up to four objective functions: building energy use, capital cost, daylight distribution, and thermal indoor environment.
Several research studies developed Python-based algorithms linking EnergyPlus and TRNSYS simulation tools with jEPlus and Multi-Objective Building Optimization (MOBO) plug-ins, respectively [24,25,26]. In particular, Pajek and Košir [26] aimed at outlining the implications of passive design measures on the energy use of single-family residential buildings under European representative climates. Results demonstrated that it is difficult to neutralise the projected climate change effects on buildings’ energy use, even when applying the best performing combination of passive design measures. In the findings of Abdou et al. [2], the MOBO tool was applied to the exploration of design alternatives for retrofitting of an existing residential building, with the overall goal of meeting the zero-energy balance. The workflow permitted us to achieve significant energy savings in different Moroccan regions.
Finally, the Optimo tool was utilized within the Dynamo environment to perform optimizations about energy demand, thermal and visual comfort, and solar accessibility [27,28,29]. Such workflows, which showed a lower number of variables if compared with the others, were mainly exploited to identify high effective configurations of a building’s envelope.
As reported in Figure 8a, up to 50 publications describe MOO models capable of optimizing the building energy performance, whereas only 18 and 12 publications minimize life-cycle costs and emissions, respectively. Alongside these, solar accessibility (30) and thermal comfort (30) were included among the objective functions of 60 publications.
Table
Table 3. Tabular review of journal articles about Python-based MOO workflows.
Table 3. Tabular review of journal articles about Python-based MOO workflows.
Ref.YearOptimized ParametersLong-Term EvaluationOptimization Tool (Optimization Method)Parameters
LCCLCAEnergy PerformanceSolar AccessibilityThermal ComfortOrientationWWRWindows TypologyBuilding DimensionsEnvelope PropertiesInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy PatternOther
[27]2015 xx NOptimo xx
[23]2015x xx NOctopus x
[24]2016xxx NjEPlus x
[20]2017 x NOctopus x
[17]2017x x NGalapagos x x x
[25]2018x x NMOBO tool xx x
[21]2018 x x NOctopusxx xx
[16]2020 x NGalapagos xx xx
[15]2020 xx NOctopus x
[29]2020 xx NOptimo xx
[28]2020 xx NOptimo x
[22]2020 xx NOctopus x x
[2]2021x x NMOBOxxx xx
[12]2021xxx NPython x x
[26]2021 x YjEPlus xxxx x
[18]2021 xx NColibrì, Octopus xx
[19]2021x x NOctopus x x
[3]2021 xx NColibrixxxxx x
[14]2021 xx NOctopus x
[13]2021 xx NOctopus xx x

3.2.2. MATLAB-Based Workflows

Around 40 research studies presented workflows based on MATLAB. These were using MATLAB’s functions such as gamultiobj to identify the Pareto front (Figure 7). EnergyPlus, TRNSYS, and DAYSIM were the most exploited simulation engines to perform energy and solar analysis as well as to evaluate thermal and visual comfort conditions [30,31,32]. Alongside these, SimaPro software was also integrated into the MOO model developed by Islam et al. [33] to minimize life-cycle emissions and costs.
In particular, Yong et al. [34] proposed a multi-objective particle swarm algorithm coupled to EnergyPlus to optimize the energy performance of residential buildings (Table 4). Similarly, Ghaderian and Veysi [35] developed an optimization procedure based on combining surrogate models linked to EnergyPlus engine with a GA. This was applied to the enhancement of the building’s energy consumption and its occupants’ thermal comfort, simultaneously. Pareto’s multi-objective approach is applied by Ascione et al. [36] to a neighbourhood case study with the aim of achieving the ZEB standard while ensuring cost-effectiveness.
The MOO models implemented in the MATLAB environment were demonstrated to be suitable for handling a higher number of objective functions. Indeed, three out of the six reviewed journal articles which describe optimization processes involving more than three objective functions were implemented in the MATLAB environment [37,38,39]. Such workflows enable minimizing investment costs and carbon footprint while enhancing thermal comfort level. Moreover, the approaches proposed by Ascione et al. [38] and Chang et al. [39] also improve energy efficiency, whereas the one presented by Karatas and El-Rayes [37] permitted them to efficiently exploit daylight (Table 4).
The MATLAB programming language was also utilized for conducting BPS. The numerical model implemented by Lin et al. [40] allowed of solving a cluster of thermodynamic equations about energy performance and thermal comfort, whereas the numerical model proposed by Ferreira et al. [41] focused on LCC and LCA analyses.
Finally, the three objective functions which were most investigated in MATLAB-based MOO workflows were the energy performance (28), the LCC (22), and the thermal comfort (20) (Figure 8b). In addition to these, only 16 publications evaluated life-cycle emissions (8) and solar accessibility (8) in combination with other objective functions.
Table
Table 4. Tabular review of journal articles about MATLAB-based MOO workflows.
Table 4. Tabular review of journal articles about MATLAB-based MOO workflows.
Ref.YearOptimized ParametersLong-Term EvaluationOptimization Tool (Optimization Method)Parameters
LCCLCAEnergy PerformanceSolar AccessibilityThermal ComfortOrientationWWRWindows TypologyBuilding DimensionsEnvelope PropertiesInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy PatternOther
[37]2015xx x NMATLAB xx x x xx
[33]2015xx NLINDO x x
[30]2016x x NMATLAB x x
[31]2017x x NMATLAB x x x
[38]2018xxx NMATLAB x x x
[36]2020x xx NMATLAB x x x
[34]2020 xx NMATLABxxx x x x
[39]2020xxx NMATLAB x x x
[41]2020x x NMATLAB x x
[32]2020 xx NMATLAB x
[35]2021 x NMATLAB xxx x
[40]2021xx NMATLAB xx x xx

3.2.3. Java-Based Workflows

The core of the reviewed Java-based MOO models was represented by the GenOpt tool from the Java GAs package (Figure 7). Such a tool was utilized in five research studies in combination with EnergyPlus, Radiance, and TRNSYS simulation engines [42,43,44]. Objective functions concern the building’s energy demand and solar accessibility, and also thermal comfort and daylight exploitation (Table 5). When it comes to the optimization variables, these workflows explored different envelope configurations by varying WWR, windows’ typology, thermal insulation of building envelope, and shading systems.
Carlucci et al. [7] implemented a procedure to support the design of a nearly zero-energy house in order to minimize thermal and visual discomfort. The non-dominated sorting genetic algorithm, implemented in the GenOpt optimization engine, was used to instruct the EnergyPlus simulation engine. Similarly, the approach proposed by Ameur et al. [43] aimed at optimizing building thermal and lighting energy performance by coupling EnergyPlus and GenOpt tools.
Figure 8c shows that Java-based MOO workflows were not applied to the optimization of life-cycle costs and emissions. On the contrary, solar accessibility, thermal comfort, and energy performance were investigated in 3, 4, and 5 publications.

3.2.4. Other Workflows

In this section, all the MOO models which were developed in an unspecified environment or in an environment different from Python, MATLAB, and Java are reported.
The building performance optimization procedures carried out by Si et al. [45] and Giouri et al. [46] were based on ModeFRONTIER software (Figure 7 and Table 6) and they aim to implement integrated decision-making strategies to design high performing buildings. However, Si et al. [45] also exploited a surrogate model developed by an ANN metamodel to reduce the computing time.
A multi-criteria analysis of monocrystalline PV panels mounted on typical south-facing shading devices of office buildings in the Mediterranean region was performed through Visual PROMETHEE software by Stamatakis et al. [47]. A series of objective functions which include PV panels’ energy production, buildings’ energy efficiency, and users’ visual comfort were taken into account in this research study (Table 6).
When it comes to new methodologies, a multi-objective performance analysis (MOPA) model for early design of cost-optimal zero-energy lightweight construction was developed by Amer et al. [48]. Similarly to other MOO models, the MOPA workflow follows three consecutive steps such as modelling setup, BPS, and outcomes evaluation and selection. Alongside this, a VBA-based tool was implemented by Bayoumi and Fink [49] which enables design exploration of building façades for enhancing energy saving and energy generation. Such a tool was also capable of investigating the correlation between thermal and visual comforts.
Several journal articles described optimization procedures that were performed manually [50,51,52,53,54,55] (Figure 7). These studies mostly propose workflows to select the best among different pre-determined design alternatives through a comparative process. Design alternatives were not generated through GAs but implemented manually, thus reducing the results’ reliability. Carriço de Lima Montenegro Duarte et al. [55] followed a similar approach when designing windows and shading devices in an educational building in Brazil with the aim of minimizing energy demand while improving visual and thermal comfort. Conversely, a multi-criteria methodology for optimization of residential buildings which is based on sensitive analysis was presented in Croitoru et al. [56]. This work described a parametric study regarding the impact on energy consumption with different factors and the weighing associated.
Finally, Figure 8d highlights that the energy performance was the most investigated objective function (34), followed by thermal comfort (19), solar accessibility (14), and life-cycle costs (13).
Table
Table 6. Tabular review of journal articles about MOO workflows developed in an unspecified environment or in an environment different from Python, MATLAB, and Java.
Table 6. Tabular review of journal articles about MOO workflows developed in an unspecified environment or in an environment different from Python, MATLAB, and Java.
Ref.YearOptimized ParametersLong-Term EvaluationOptimization Tool (Optimization Method)Parameters
LCCLCAEnergy PerformanceSolar AccessibilityThermal ComfortOrientationWWRWindows TypologyBuilding DimensionsEnvelope PropertiesInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy PatternOther
[49]2014 xx NMS Excel xx x
[50]2015 xx NManually x
[56]2016 x NManuallyx x x
[47]2016 xx NVisual PROMETHEE x x
[51]2016 xx NManually xx
[52]2016 xx NManuallyxx x
[45]2019 x NmodeFRONTIER x x x
[53]2020 x NManually x
[48]2020x x NMOPA x x x
[54]2020 xx NManuallyx x
[46]2020 x NmodeFRONTIER xx xxx x
[55]2021 xx NManually xx xx

3.3. Knowledge Gaps and Future Trends

The review process of journal articles concerning MOO models for integrated building design permitted us to identify the knowledge gaps which are described in the following paragraphs. Firstly, almost the totality of the journal articles avoided taking into account climate change effects in their MOO models. Statistical weather files, which are based on mean values of climate variables calculated over the past 15 years, or monitored data were used by leading to biased optimization outcomes. Such a bias was more evident when the whole building life cycle was considered. In fact, the building lifetime is generally considered to be as high as 60 years, and climate parameters such as the near-surface air temperature and the radiative forcing are expected to change within this time interval. Therefore, the effectiveness of optimized strategies and technologies for cooling might be reduced throughout the building’s lifetime. Several research studies such as the ones carried out by Allouhi [57] and Zou et al. [58] started filling such a knowledge gap by proposing temporal dynamic optimization procedures which integrate BPO with medium- and long-term impact assessment of climate change effects.
Secondly, the reviewed workflows were found to perform optimization at a single scale such as neighbourhood, building, and room scale without linking them. A multi-scale approach is necessary to consider inter-building effects and mutual influences between the indoor and the outdoor environment. For example, the application of a highly reflective coating on a building façade for passively cooling the indoor environment may also lead to an increase in the solar radiation impinging on near urban surfaces (i.e., buildings envelopes, street surface, pedestrian areas) by worsening the thermal stress of pedestrians. Therefore, it is necessary to establish MOO models operating at multiple spatial scales which enable solving objective functions concerning different environments (i.e., the room and the whole building, the building and the street environment, the building and the neighbourhood) at the same time.
Thirdly, coupling different building typologies such as office, commercial, and residential can be an effective strategy to further improve building energy management and it might represent a relevant future trend in the integrated building design research field [59]. Several journal articles have already investigated how occupancy-related variables such as occupancy pattern, indoor temperature set-point, and lighting conditions can impact energy, users’ comfort, emissions, and costs [16,30,37,60,61]. Following this, future works should consider combining different occupancy typologies to enhance buildings’ energy, economic, and environmental sustainability.
Finally, around 15% of the reviewed journal articles performed LCA analyses, but they mostly focused on the operational stage by avoiding investigating emissions embodied in construction materials [62,63]. The building energy consumption is generally converted into carbon emissions through the energy mix factor. It is worth highlighting that such a knowledge gap has been partially filled by Azari et al. [64] and by Lobaccaro et al. [21], but further investigations are needed to develop multi-criteria workflows including embodied emissions assessment.
Following this, the future trends in designing a responsive built environment will concern the implementation of a new generation of MOO models capable to operate at multiple spatial and temporal scales with increased attention towards the minimization of emissions embodied in construction materials. Such a holistic approach to building and neighbourhood optimization will necessarily take advantage of benefits related to the combination of different building typologies in order to further enhance the building’s energy efficiency. All these aspects can now be taken into account thanks to the recent implementation of metamodels which enable lower computational time for BPS.

4. Conclusions

A synthetic review of MOO models is carried out in order to design responsive buildings and neighbourhoods. The review focused on the utilized software during both simulation and optimization stages, as well as on the identified objective functions and design variables. Results highlighted that MOO models are widely exploited for defining a trade-off between building energy efficiency (i.e., minimization of energy demand for heating and cooling, maximization of energy production from RES) and thermal and visual comfort. In addition to that, some research studies demonstrated that such GAs are suitable for minimizing construction costs as well as operational emissions. The reviewed MOO models can only perform optimization at a single scale, mainly handling variables related to characteristics of a building or a test room. Among the optimized design variables, the commonest were the ones describing the building’s envelope, the glazed surfaces, and the shading devices. The possibility of exploring different shape solutions for the building case study was only implemented in a few works.
Automation for integrated building design has been improving significantly between 2014 and 2021 due to the implementation of numerous MOO models that rapidly substituted the previous single-objective optimization algorithms. Nonetheless, there are still some aspects that need to be further enhanced to fully enable the potential of optimization tools in the design of responsive building solutions, in particular, the capability of optimizing design variables and of solving objective functions at multiple scales by also taking into account climate change effects. This is expected to be the future trend about such a research topic together with the development of MOO models that can investigate sector coupling solutions to achieve higher energy efficiency levels.
When it comes to the limitations of the work, it is worth underlining that this review study focused more on the methodology than on the results of the reviewed publications. Therefore, a partial overview of the potentialities of MOO models is provided by neglecting their effectiveness in designing responsive buildings. Following this, future developments of this study must necessarily consider this aspect when reviewing MOO models.

Author Contributions

Conceptualization, M.M.; methodology, A.N. and M.M.; software, M.M.; formal analysis, M.M.; investigation, A.N and M.M.; resources, A.N.; data curation, M.M.; writing—original draft preparation, M.M.; writing—review and editing, A.N.; visualization, M.M.; supervision, A.N. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

Nomenclature

GHGGreenhouse gases
ZEBZero-energy building
BPSBuilding performance simulation
GAGenetic algorithm
MOOMulti-objective optimization
BPOBuilding performance optimization
MOPSOMulti-objective particle-swarm optimization
SPEA2Strength Pareto evolutionary algorithm
NSGA-IINon-sorting genetic algorithm
ANNArtificial neural network
WoSWeb of Science
LCCLife-cycle cost
VBAVisual Basic for Applications
LCALife-cycle assessment
WWRWindow-to-wall ratio
RESRenewable energy source
MOBOMulti-objective building optimization
MOPAMulti-objective performance analysis

Appendix A

Table
Table A1. Tabular review of the selected journal articles.
Table A1. Tabular review of the selected journal articles.
Ref.YearLocationCase StudyOptimized ParametersLong-Term EvaluationSimulation EngineOptimization Tool (Optimization Method)Parameters
LCCLCAEnergy PerformanceSolar AccessibilityThermal ComfortOrientationWWRWindows TypologyBuilding DimensionsEnvelope PropertiesInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy PatternOther
[49]2014Saudi Arabiaoffice building xx NMS ExcelMS Excel xx x
[63]2014Germanyoffice buildingxxx NMS Exceln.d. x xxx
[65]2014Netherlandsoffice building xx NTRNSYS, Radiancen.d. xx x
[27]2015UKresidential building xx NAutodesk GBSOptimo xx
[50]2015Japanoffice building xx NRadiance, EnergyPlusManually x
[42]2015USAeducational building xx NRadiance, EnergyPlusGenOpt xx x x
[62]2015miscellaneousoffice building x NEnergyPlusPython xx x
[7]2015Italyresidential building x NEnergyPlusGenOpt x x xx
[23]2015Denmarkoffice buildingx xx NRadiance, Be10Octopus x
[37]2015USAresidential buildingxx x NEnergyPlusMATLAB xx x x xx
[66]2015miscellaneouscommercial buildingx x NEnergyPlusn.d.xxx x x x
[67]2015Hong Kongoffice buildingxx NTRNSYSMATLAB x
[68]2015Chinaresidential building x NEnergyPlusMATLABxxxxx
[33]2015Australiaresidential buildingxx NSimaProLINDO x x
[56]2016Romaniaresidential building x NDesignBuilderManuallyx x x
[47]2016Greeceoffice building xx Nn.d.Visual PROMETHEE x x
[51]2016Serbiaoffice building xx NRadiance, EnergyPlusManually xx
[69]2016Norwayresidential building x x NLadybug, HoneybeeOctopus x
[70]2016Argentinaresidential building x NEnergyPlusPythonxxx xx x
[6]2016miscellaneousresidential building x NDesignBuildern.d. xx x x
[24]2016Spainresidential buildingxxx NEnergyPlusjEPlus x
[71]2016Hong Kongresidential building x NEnergyPlusjEPlusxxx xx
[61]2016USAotherx NDesignBuilder, RSMeans, MySQLn.d. x x x xx
[72]2016Iranoffice building xx NEnergyPlusMATLABxx x
[64]2016USAoffice building xx NeQuest, AthenaIEn.d. xx x
[73]2016Chinaother x NLadybugOctopus x
[74]2016Irantest room x NEnergyPlusjEPlusxxx x x
[75]2016Portugalresidential building x NEnergyPlusn.d.x x x x
[30]2016Hong Kongoffice buildingx x NEnergyPlusMATLAB x x
[52]2016Indonesiaoffice building xx NRadianceManuallyxx x
[76]2016miscellaneousoffice building xx NRadiance, EnergyPlusOctopusxxxxx
[20]2017Italyeducational building x NLadybug, HoneybeeOctopus x
[31]2017Franceresidential buildingx x NTRNSYSMATLAB x x x
[77]2017Argentinaresidential building x NEnergyPlusPythonxxx xx xx
[17]2017Spainresidential buildingx x NDIVAGalapagos x x x
[78]2017miscellaneousresidential building xx NEnergyPlus, RjEPlusxxx xx
[38]2018Italyoffice buildingxxx NEnergyPlusMATLAB x x x
[79]2018Italyotherxxxx Nn.d.n.d. x
[25]2018miscellaneousresidential buildingx x NTRNSYSMOBO tool xx x
[21]2018Norwayresidential building x x NLadybug, HoneybeeOctopusxx xx
[80]2018Chinaresidential building x NEnergyPlusMATLABxxx xx xx
[44]2018Italyeducational building xx NTRNSYSGenOpt xx x x
[81]2018Polandresidential buildingx NEnergyPlusMATLABxxx xx
[82]2018Chinaresidential buildingx x NDesignBuildern.d.xx x xx
[83]2018Chinaresidential building x NEnergyPlusjEPlus xx xx x
[84]2018miscellaneousresidential buildingx x NTRNSYSMOBO tool xx x x
[85]2018Chinaother x NDesignBuilderMATLAB x x
[86]2018Chinaresidential buildingx x NDesignBuilderMATLAB x x x
[87]2018Iranresidential buildingx x NBCS19n.d. x x x
[88]2018Singaporeoffice building xx NpythonPythonx x x
[89]2018Chinasport building xx NLadybug, Honeybee, KarambamodeFRONTIER x x
[90]2018Japanoffice building x NStarCDn.d. xx x x
[60]2019Italyresidential buildingx NEnergyPlusMATLAB x
[91]2019Spaineducational buildingx x Nthermodynamic equationsn.d. x x
[92]2019Indiaother x NCFDn.d. x
[93]2019Canadaresidential buildingxx NTRNSYSPython xx x xxx
[94]2019Singaporeresidential buildingx xx NEnergyPlusjEPlusxxx x xxx x
[95]2019Norwaytest room xx NLadybug, HoneybeeOctopus x
[96]2019Mexicoresidential buildingx x NEnergyPlusPythonx x x xxx x
[97]2019Switzerlandoffice buildingxx NEnergyPlusOpossum x
[98]2019South Koreaeducational buildingx NEnergyPlusPython x x x
[99]2019Italyresidential buildingx x NEnergyPlusMATLABx x x x
[100]2019Italyoffice buildingx x NEnergyPlusMATLABxxx x xx
[45]2019Chinaother x NEnergyPlusmodeFRONTIER x x x
[101]2019Chinatest room xx NEnergyPlusn.d.xxx
[102]2019Swedenresidential building x NHoneybeeOctopusxx xx
[103]2020Chinaother x Nn.d.n.d. x
[53]2020Turkeyresidential building x NAutodesk CFD, eQUESTManually x
[104]2020n.d.other xx NData drivenn.d. x x x
[105]2020miscellaneousresidential building x x NLadybug, HoneybeeOctopusxx xx
[48]2020Belgiumotherx x NLadybug, HoneybeeMOPA x x x
[36]2020Italyneighborhoodx xx NEnergyPlusMATLAB x x x
[16]2020Iraneducational building x NLadybug, HoneybeeGalapagos xx xx
[57]2020Moroccocommercial buildingxx Yn.d.MATLAB x
[106]2020Polandresidential building x YEnergyPlusMATLAB x
[107]2020Denmarkoffice building x NEnergyPlusMOBO x
[34]2020Chinaresidential building xx NEnergyPlusMATLABxxx x x x
[39]2020Japanresidential buildingxxx NLadybug, HoneybeeMATLAB x x x
[15]2020USAoffice building xx NLadybug, HoneybeeOctopus x
[108]2020Omanresidential buildingx x NEnergyPlusMATLAB xx x x
[109]2020South Koreaoffice building x NEnergyPlusMATLAB x
[54]2020Swedenneighborhood xx NHoneybeeManuallyx x
[29]2020Australiaresidential building xx Nn.d.Optimo xx
[110]2020Portugalresidential building x NEnergyPlusn.d. x xx x
[111]2020Mauritiusresidential buildingxx NEnergyPlusjEPlusx x x
[112]2020Iranresidential buildingx x NEnergyPlusn.d. xx x
[28]2020Australiaresidential building xx NEnergyPlusOptimo x
[41]2020Portugalresidential buildingx x Nthermodynamic equationsMATLAB x x
[113]2020Italyresidential buildingxxx NEnergyPlusn.d.xxxxx x
[114]2020Hong Kongsport buildingx x NTRNSYS, MATLABn.d. x
[115]2020Turkeyresidential building xx NEnergyPlusGenOpt x
[116]2020Chinaresidential buildingxx NEnergyPlus, PythonPythonxxx xx
[117]2020Chinaeducational building xx NLadybug, HoneybeeOctopusxxxx
[118]2020USAresidential buildingx x NLadybug, HoneybeeOctopusx x x
[119]2020Chinaoffice building x NDesignBuilderjEPlusxxx x
[120]2020Republic of Koreaoffice building x NEnergyPlusMATLABxx
[121]2020miscellaneoustest room xx NLadybug, HoneybeeOctopus x
[43]2020Moroccoresidential building x NEnergyPlusGenOpt xx x xx
[122]2020Chinaoffice building xx NEnergyPlusPython xx x xx x
[32]2020Braziloffice building xx NDomus, DaysimMATLAB x
[22]2020Iranoffice building xx NLadybug, HoneybeeOctopus x x
[46]2020Greeceoffice building x NLadybug, HoneybeemodeFRONTIER xx xxx x
[123]2020Iranoffice building xx NEnergyPlusjEPlus x
[124]2020Argentinaresidential building x NEnergyPlusPythonxxx x x
[2]2021Moroccoresidential buildingx x NTRNSYSMOBOxxx xx
[12]2021Canadamiscellaneousxxx NSimaPro, HOT2000, HTAPPython x x
[125]2021Algeriaeducational building xx NLadybug, HoneybeeOctopusxxx x x
[55]2021Brazileducational building xx NInsight 360, DesignBuilderManually xx xx
[126]2021Chinaoffice building xx NDynamo, Radiance, Daysim, Green Building Studio, MATLAB (Self-Organizing Mapping)n.d. x x
[127] 2021UKoffice buildingxxx NData drivenn.d. x x x
[128]2021Chinatest room xx NLadybug, HoneybeeOctopus x
[58]2021Chinaeducational building xx YLadybug, HoneybeePythonxxxxx x
[129]2021Chinaresidential buildingx x NEnergyPlusMATLAB x x x
[130]2021Malaysiatest room xx NLadybug, HoneybeeOctopus x
[131]2021n.d.miscellaneous xNANSYSMATLAB x x
[132]2021Chinaeducational building x NDesignBuilderDesign-Expert xx x
[35]2021Iranoffice building x NEnergyPlusMATLAB xxx x
[26]2021miscellaneousresidential building x YEnergyPlusjEPlus xxxx x
[133]2021Italyneighbourhoodx x NEnergyPlusMATLAB x x x x
[134]2021Turkeyresidential buildingx x NEnergyPlusMATLABxxx x
[135]2021miscellaneouseducational building x NLadybug, ClimateStudio for RhinoDesign Space Exploration x x
[18]2021Iranoffice building xx NLadybug, Honeybee, EnergyPlus, OpenStudio, DaysimColibrì, Octopus xx
[136]2021USAoffice building xx NLadybug, Honeybeen.d. x
[137]2021Chinaresidential building x NQuVue, Eddy3dMATLAB x
[138]2021Serbiaresidential building x NDesignBuildern.d. xx x x
[139]2021Shanghairesidential buildingx NDesignBuildern.d. xx x xx x
[19]2021Chinaeducational buildingx x NLadybug, HoneybeeOctopus x x
[140]2021Australiatest room x NCFStracen.d. x
[141]2021Brazilresidential building x NEnergyPlusMATLAB x xx
[142]2021Italyeducational buildingx xx NLadybug, HoneybeeMATLABxxx x x
[143]2021Chinaeducational building x NDesignBuilderMATLAB xx x
[144]2021Iranresidential building xx NLadybug, Honeybee, RevitOctopus x x x
[145]2021Australiaresidential buildingx x NTRNSYSjEPlus xx x x
[146]2021Australiamiscellaneousx xx NRevit, InsightAMPL xx x x
[3]2021Chinaeducational building xx NLadybug, HoneybeeColibrixxxxx x
[147]2021South Korearesidential buildingxxx NTRNSYSMATLAB xx xx x
[148]2021Swedenresidential building xx NEnergyPlusPython x x
[8]2021Chinaeducational building x NEnergyPlus, EppyMATLAB x xxxx
[14]2021Malaysiaoffice building xx NLadybug, HoneybeeOctopus x
[40]2021Taiwanoffice buildingxx NNumerical modelMATLAB xx x xx
[13]2021Japanresidential building xx NLadybug, HoneybeeOctopus xx x

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Figure 1. Density visualization of words in the title, abstract, and authors’ keywords from the journal articles selected at the end of step two. The words included in the search (i.e., “multiobjective”, “design”) were excluded from the figure.
Figure 1. Density visualization of words in the title, abstract, and authors’ keywords from the journal articles selected at the end of step two. The words included in the search (i.e., “multiobjective”, “design”) were excluded from the figure.
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Figure 2. Temporal distribution of the reviewed journal articles.
Figure 2. Temporal distribution of the reviewed journal articles.
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Figure 3. Spatial distribution of the case studies investigated in the reviewed journal articles. Studies applying the MOO workflow to various latitudes are clustered in the “miscellaneous” category.
Figure 3. Spatial distribution of the case studies investigated in the reviewed journal articles. Studies applying the MOO workflow to various latitudes are clustered in the “miscellaneous” category.
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Figure 4. Case study typologies assessed in the reviewed journal articles. The “other” category includes other building typologies such as public buildings and tourist centers.
Figure 4. Case study typologies assessed in the reviewed journal articles. The “other” category includes other building typologies such as public buildings and tourist centers.
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Figure 5. Objective functions evaluated in the reviewed journal articles. A larger area corresponds to a higher number of works that optimized that function.
Figure 5. Objective functions evaluated in the reviewed journal articles. A larger area corresponds to a higher number of works that optimized that function.
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Figure 6. Programming languages utilized to write the MOO algorithms in the reviewed journal articles. A larger area corresponds to a higher number of algorithms based on that programming language. The “other” category also includes those journal articles which did not declare the programming language.
Figure 6. Programming languages utilized to write the MOO algorithms in the reviewed journal articles. A larger area corresponds to a higher number of algorithms based on that programming language. The “other” category also includes those journal articles which did not declare the programming language.
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Figure 7. Number of publications for each optimization engine exploited in the MOO models.
Figure 7. Number of publications for each optimization engine exploited in the MOO models.
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Figure 8. Number of publications for each objective function. Results are presented according to the used programming language: (a) Python, (b) MATLAB, (c) Jave, and (d) others.
Figure 8. Number of publications for each objective function. Results are presented according to the used programming language: (a) Python, (b) MATLAB, (c) Jave, and (d) others.
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Table
Table 1. The number of publications per each couple of objective functions. Color transparency is inversely proportional to the number of publications. The white color corresponds to zero, whereas the red color corresponds to the highest amount (60).
Table 1. The number of publications per each couple of objective functions. Color transparency is inversely proportional to the number of publications. The white color corresponds to zero, whereas the red color corresponds to the highest amount (60).
LCCLCAENDAYLWINDTHERM
5318379026LCC
25135010LCA
11545060EN
57024DAYL
10WIND
73THERM
Table
Table 2. The number of publications per each couple of optimization variables (i.e., there are 32 journal articles that optimize WWR and orientation at the same time). Color transparency is inversely proportional to the number of publications. The white color corresponds to zero, whereas the red color corresponds to the highest amount (68).
Table 2. The number of publications per each couple of optimization variables (i.e., there are 32 journal articles that optimize WWR and orientation at the same time). Color transparency is inversely proportional to the number of publications. The white color corresponds to zero, whereas the red color corresponds to the highest amount (68).
OrientationWWRWindows (Type)Building Dimension/ShapeEnvelope InsulationInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy Pattern
403230113388155231Orientation
7157135212132810353WWR
84768142030141074Windows (type)
2190031100Building dimension/shape
86182527111495Envelope insulation
18453122Infiltration rate
3487764Heating system
409230Shading device
20040Natural ventilation
1900RES
103Lighting appliances
8Occupancy pattern
Table
Table 5. Tabular review of journal articles about Java-based MOO workflows.
Table 5. Tabular review of journal articles about Java-based MOO workflows.
Ref.YearOptimized ParametersLong-Term EvaluationOptimization Tool (Optimization Method)Parameters
LCCLCAEnergy PerformanceSolar AccessibilityThermal ComfortOrientationWWRWindows TypologyBuilding DimensionsEnvelope PropertiesInfiltration RateHeating SystemShading DeviceNatural VentilationRESLighting AppliancesOccupancy PatternOther
[42]2015 xx NGenOpt xx x x
[7]2015 x NGenOpt x x xx
[44]2018 xx NGenOpt xx x x
[43]2020 x NGenOpt xx x xx
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Manni, M.; Nicolini, A. Multi-Objective Optimization Models to Design a Responsive Built Environment: A Synthetic Review. Energies 2022, 15, 486. https://doi.org/10.3390/en15020486

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Manni M, Nicolini A. Multi-Objective Optimization Models to Design a Responsive Built Environment: A Synthetic Review. Energies. 2022; 15(2):486. https://doi.org/10.3390/en15020486

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Manni, Mattia, and Andrea Nicolini. 2022. "Multi-Objective Optimization Models to Design a Responsive Built Environment: A Synthetic Review" Energies 15, no. 2: 486. https://doi.org/10.3390/en15020486

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