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Review

CO2 Emissions in Buildings: A Synopsis of Current Studies

by
Pedro J. Zarco-Periñán
1,*,
Fco Javier Zarco-Soto
1,
Irene M. Zarco-Soto
1,
José L. Martínez-Ramos
1 and
Rafael Sánchez-Durán
2
1
Departamento de Ingeniería Eléctrica, Escuela Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain
2
Endesa, Avenida de la Borbolla, 5, 41004 Sevilla, Spain
*
Author to whom correspondence should be addressed.
Energies 2022, 15(18), 6635; https://doi.org/10.3390/en15186635
Submission received: 28 June 2022 / Revised: 25 August 2022 / Accepted: 8 September 2022 / Published: 10 September 2022

Abstract

:
CO2 is the most emitted greenhouse gas and is mainly produced by human activity. In fact, about 75% is emitted in cities and 40% of global carbon emissions is produced by the building sector. Therefore, buildings are very important in terms of CO2 emissions. This importance is also reflected in the works that have been developed on this subject. This manuscript reviews the research that has shown or calculated the amounts of CO2 emitted in buildings. For a better understanding of the scope of the investigations, a classification is presented. With this, it is intended to help researchers interested in this area by summarizing the studies carried out to date on the amounts of CO2 emitted depending on the type of building.

1. Introduction

1.1. Overview

The world population living in cities reaches 55% and this percentage is expected to reach 68% in 2050. However, that percentage has already been reached in some areas. Thus, the urban population in North America, Latin America and the Caribbean is already over 80%; in Europe, it reaches 75% and in Oceania 68% [1]. In addition, 75% of CO2 emissions are produced in cities and they consume between 60 and 80% of energy [2]. In particular, 36% of energy is consumed and 40% of emissions are produced in buildings [3]. However, in 2020, these values decreased by 1% and 10%, respectively, due to the COVID-19 pandemic [4]. The usual form of energy consumption in buildings is as electricity and as natural gas for thermal consumption [5].
Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and hydrofluorocarbons (HFCs) are the main greenhouse gases (GHG). CO2 is the GHG that is emitted the most, reaching 80% of the total. In addition, it is mainly produced by human activity. 77% of this pollutant comes from energy, of which transport accounts for about a third [6].
Energy consumption and gas emissions in cities are important; however, the area occupied by them is small. For example, in the European Union, it is only 4% [7]. Hence the importance of any action that is carried out in cities in general and in buildings in particular. This is reflected in the guidelines issued by the different organizations and that appear in the Sustainable Development Goals of the United Nations through Goals 7, 11, 12 and 13 [2]. They refer to energy, cities, sustainable and responsible consumption and production, and the reduction of emissions, respectively. At the European level, the European Green Deal aims to stop producing net greenhouse gas emissions by 2050 [8]. In this regard, 100 European cities have been selected to be climate-neutral and smart cities by 2030 [9]. With this, it is intended that they serve as experimentation and innovation hubs that make it easier for other cities to also achieve this goal by 2050.

1.2. Aim of the Research

The importance that buildings have in the emission of GHG is clear. For this reason, this manuscript is focused on its emissions. A compilation and classification of publications that show or calculate CO2 emissions from buildings is presented. The sectors and groupings shown in the publications have been maintained. Thus, if one paper shows emissions from residential buildings and another from residential and commercial buildings, each one has been considered to belong to a different group. The classification has been made considering these groups. In this way, the researcher interested in analyzing the amounts of CO2 emitted in buildings has this information in an accessible and unified way. Thus, their studies have a clear starting point.

2. Classification

The search for studies that show or calculate CO2 emissions from buildings is carried out. The groupings used by researchers in their publications are considered. From this, a classification is proposed, and the papers are assigned to it.
Classifications with different approaches can be performed. Thus, it can be carried out taking into account the following: the type of building (residential, commercial, universities, etc.); its location (urban, rural, etc.); the characteristics of the resident (age, income level, size of the building, etc.); the origin of the emissions (heating, air conditioning, etc.); whether they are direct or indirect emissions; if the entire life cycle is considered; etc. Moreover, any of them with a greater or lesser breakdown or degree of aggregation may be taken into account. For example, if it is about residential buildings, then it is considered whether if it is a rural or urban environment or if it covers both together; if they are buildings of the tertiary sector, differentiating or unifying them; or even joining all the buildings without differentiating, whether they are residential or not. In other cases, the analyses of CO2 emissions have been carried out on a certain type of building or dwelling that has been taken as a sample, or with a certain geographical scope, which is usually a very broad region.
The goal of this work is to help researchers to know the state of the art and their bibliographic search. Therefore, it is necessary to consider the type of work that is usually carried out. From the point of view of the authors, a classification based on the type of building is the one that may be most useful for this purpose.
The grouping of the research works proposed in this manuscript is shown in Figure 1.

3. Airport Facilities

Today, airports are small cities through which billions of passengers pass each year. The energy consumption, the services they need, the waste they produce and the emissions they generate are like those of any city. Numerous manuscripts on aircraft emissions have been published. However, they have not been carried out on emissions from buildings. CO2 emissions from airport ground operations of 70 Chinese airports have been calculated. For this, fuel type consumed in on-ground airport operations and the CO2 emission factor were used. In addition, night light data from images obtained from satellites were used. It was concluded that the factors that have most effect are urbanization, direct foreign investment, tertiary industry, passenger turnover of civil aviation and passenger turnover of railways, the latter being negative [10].

4. University Centers

As in other buildings for tertiary use, university centers are active mostly in the day. They may consist of several buildings or just one. They include the academic zone, administrative zone and, in some cases, laboratories. Savings measures in university centers is one of the recurrent study topics. However, emissions of this type of building have been little studied. As is generally the case in buildings, natural gas and electricity are their main sources of energy. A prediction of daily consumption has been carried out from six explanatory variables [11]. Due to the cessation of academic activity on weekends, the day of the week is one of those variables considered. Five-year data and a multiple regression technique have been used to make the prediction. Data from a London university center have been used to test the forecast model and emissions, due to both electricity and natural gas having been calculated.

5. Hotel Facilities

The importance of hotels from the point of view of emissions is high, both because of the number of those that exist and because of the wide range of services that they offer to their clients. At the country level, Italy has been studied. Energy consumption has been evaluated to identify emissions. Subsequently, the potential energy savings and the possibility of implementing energy efficiency in them has been analyzed. The main saving measures are: substitutions of windows; substitution of current bulbs with LED bulbs; wall insulation; installation of condensing boilers; and installation of heat pumps [12]. Using a similar methodology at the city level, 28 hotels have been studied in Lagos (Nigeria) [13] and 17 in Hong Kong [14]. In the first case, the energy consumption per room was calculated, and in the second the consumption per m2. Based on that knowledge, their emissions were also evaluated, starting from the fuel emission coefficient in one case and from that of electricity in another. Another way of approaching these studies has been based on the characterization of the most common type of hotels in the United Kingdom. Studying only two hotels, 67% of the hotels were covered. One of them modern and specially designed, and another old and remodeled. With this, conclusions were obtained on the measures to be considered to reduce their emissions: ventilation heat recovery through a thermal wheel; wall insulation externally or internally through expanded polystyrene or mineral fiber; argon-filled triple glazing; efficiency improvements in lighting; electrical appliances and kitchen catering equipment; efficient motors for lifts; replacement of conventional gas heating by condensing boiler; and water heating using solar thermal collectors [15].
Benchmarking has also been done on the Singapore hotel industry. For this, 29 hotels have been studied, electricity being the main source of energy. As a relevant conclusion, It was obtained that the characteristic that serves to normalize hotels must be very well chosen because carbon intensity is very sensitive to it [16]. The complete life cycle of a hotel has also been studied. For this, 31 hotels in the Balearic Islands (Spain) were analyzed. Both CO2 emissions and generated waste were studied. The results show that the operation phase is the one with the greatest impact [17].

6. Public Buildings

CO2 emissions produced in public buildings have been analyzed in 119 buildings in China. Hospitals, office buildings and schools have been studied. The former are those that produce the greatest emissions and the latter those that produce the least, with a difference between them of more than 100%. Emissions are obtained from energy consumption. These have been compared with those of the United States, United Kingdom and Japan. Energy consumption per unit of construction area is lower in China than in the first two and close to the last [18].

7. Residential Buildings

CO2 emissions in the residential sector show sustained growth of 2% per year so far this century [19]. Studies of these buildings have been carried out from different points of view. In some cases, rural and urban areas are differentiated and, in others, they are studied together.

7.1. Rural Residential Buildings

Studies of emissions from residential buildings in rural areas are very scarce and limited to specific areas. Thus, the main source of energy in the province of Hubei (China) is biomass, coal and wood. A study of the emissions of the stoves used is carried out, showing which ones are better and calculating their emissions from field tests [20]. Furthermore, a study of the rural areas of Gansu, Qinghai and Ningxia provinces in China has been carried out. In this case, emissions were related to the type of agriculture developed, family income and family size. The following conclusions are reached: the highest proportion of emissions is due to the subsistence needs of families; emissions increase as income increases; and family size is inversely related to emissions [21]. Emissions in Wattwil (Switzerland) have also been shown from the statistical census. In this case, in addition to those due to residential buildings, those corresponding to land mobility have been included. In addition, the life cycle has been considered, identifying the factors that have the most influence on emissions [22].

7.2. Urban Residential Buildings

Studies that exclusively refer to urban residential buildings are few. The influence of one or several characteristics on the calculation of emissions is investigated. One of the most studied is income. The influence has been studied in China [23,24,25,26], India [27], Lebanon [28] and Melbourne [29]. In all cases, the higher the income, the higher the emissions. In the case of China, other characteristics were also included, such as the influence of urbanization, education, marital status and number of inhabitants per household. As for Indian cities, their emissions are like those of Chinese cities. For Lebanon, the number of residents was also considered. In addition, for the case of Melbourne, emissions due to automobiles were also included. In Japan, the influence that head-of-household age has on emissions was studied, being greater the older their age [30].
In urban areas, buildings are grouped into neighborhoods. In them, population density, accessibility to public transport [31], urban morphology and construction technologies influence emissions [32]. Furthermore, at the district and city level, calculation tools, emission assessment systems and efficiency measures at the urban level have been analyzed. These measures have been classified into urban morphology, buildings’ efficiency, systems’ efficiency and individual behaviors [33].

7.3. Rural and Urban Residential Buildings

Studies on emissions from residential buildings, without distinguishing between rural and urban or separating them, have been more numerous. They analyze the different factors that influence emissions. The income variable is once again recurrent in the studies. In addition to this, others that the researcher wants to highlight are included, such as, for example, the age of the residents [34], or the rural or urban location [35,36,37,38,39,40]. The conclusion reached with respect to the income level is that the higher it is, the higher the emissions. However, the emission intensities are the opposite in the Netherlands and United Kingdom [41].
Other factors have been analyzed individually. This is intended to improve emission-producing equipment and its environmental impact. This has been the case of air-conditioning equipment, whose use accounts for 33% of energy consumption in the homes analyzed [42], or the air or water adaptation systems inside the home [43], or the influence of the age of the dwelling [44]. Finally, the influence that government measures and the potential for emission reduction have in different countries has also been investigated [45,46,47,48].

7.4. Direct and Indirect Residential Emissions

CO2 emissions can have a direct or indirect origin. Those of direct origin come from the use of energy by consumers of residential origin. While those of indirect origin are a consequence of the purchase and use of products and services by consumers to satisfy their basic needs. These residential emissions are those that cause the greatest growth in direct and indirect CO2 emissions [49]. Thus, these two types of emissions represent more than 40% of carbon emissions in China [50], while estimates for the USA reach 80% [51].
Some studies have focused solely on the urban residential sector. Their conclusions are as follows: emissions are higher in cold regions and lower in larger cities [52]; depopulation of cities can generate higher emissions [53]; emissions increase with income [54]; the greater the number of people per household, the lower the emissions [55]. Regarding the region of study, in most of the investigations, no distinction has been made between rural and urban areas. The most studied country has been China, although Spain [56], USA [57], Ireland [58] and Denmark [59,60] have also been investigated. The conclusions obtained in all cases have been similar: indirect emissions increase more in urban areas, since there is a greater tendency towards tertiary industry products than in rural areas [61]; both total and direct and indirect emissions from urban households are greater than those from rural ones [62]; emissions due to indirect consumption in urban households are greater than those corresponding to direct consumption [63]; however, in rural households the opposite occurs [64]; the production and supply of electricity and hot water are the main factors that produce indirect emissions in both rural and urban households [65]; and household consumption has increased above the technological and efficiency improvements introduced [66].

7.5. Emissions in the Residential Construction Sector

The importance of CO2 emissions in the residential sector is also reflected in the construction of buildings. The containment or reduction of emissions must be achieved through different measures. Among them are not only the more efficient use of energy, the use of low-emission construction techniques or the design of buildings with low consumption, but also the establishment of government instructions that favor them [67].

7.6. Life Cycle Emissions of Residential Buildings

The life cycle of buildings encompasses the phases of materials manufacturing, transportation, construction, renovation, operational life, demolition and waste management. Embodied carbon includes all phases except the operational phase and accounts for 11% of emissions. Hence, the importance of reducing embodied carbon [68].
The life cycle in the residential sector has been studied, in particular, for Norway. The analysis of historical data from the residential sector [69] allows hypotheses to be made for the electricity needs in the building sector with different scenarios [70].

7.7. Simulation of Emissions in Households

An energy consumption and CO2 emission generation simulation game has been developed. The game allows the player to analyze how the changes made in the home and in consumption habits are effective. In addition, the costs of the measures implemented, and the savings achieved are detailed. In this way, it is possible to learn what the environmental habits to acquire and the technical measures to adopt should be [71].

8. Residential and Commercial Buildings

From the point of view of the emissions produced, residential and commercial buildings have a series of common characteristics. This makes them susceptible to being studied together. For this reason, numerous studies have analyzed them as if they were the same type of building. That is the reason why, in the classification, a different heading has been maintained from that of residential buildings: publications have been made with the sole scope of residential buildings and others join them with commercial ones. Residential and commercial buildings have been studied from different points of view: population density, reaching the conclusion that the greater the density, the greater the emissions [72]; economic income of the residents, eliminating the influence of the climate [73], without eliminating it [74], or analyzing only the effect of heating [75], observing in all cases that, the higher the income, the higher the CO2 emissions; size of the city, finding that the larger the city, the greater the emissions [76]; climate, obtaining as a result that the more extreme the climate, the greater the emissions [77]; heating and air conditioning, with a considerable increase expected due to the use of air conditioning [78]; or only heating, taking into account the forecast growth of gross domestic product (GDP) and population [79].
The life cycle has also been analyzed in Macau, concluding that around 66% of the total emissions are produced during the use stage, the rest being produced in the construction stage, since in the dismantling phase the emissions may even be negative [80].

9. Reviews

Some reviews about CO2 emissions in the residential sector have been made from different points of view. The lines of research carried out so far and their future trends have been reviewed [81]. It has been found that research in this field is interdisciplinary and more depth is needed at the city and individual level [82]. The review has also focused on quantification methods, influencing factors and measures to mitigate emissions [83].

10. Summary

A classification has been proposed. Publications showing or calculating CO2 emissions from buildings have been identified. In this way, they can be grouped according to classification. Table 1 shows the classification of the publications.
In addition, to achieve the environmental goals set by government authorities, it is necessary to reduce emissions from buildings. To apply measures that reduce them, it is necessary to know in advance what the sources are. Consequently, measures can be applied to reduce consumption and, therefore, emissions. Based on the publications analyzed in this work, the factors that most influence the production of emissions and the measures that can mitigate them are summarized.
The factors that most influence the production of emissions in the operation stage are: air conditioning; heating; ventilation; illumination; home appliances; and power motors. Analyzed publications that show these factors are shown in Table 2.
Regarding the measures that reduce emissions, the main ones are: wall insulation; substitutions of windows; efficiency improvements in lighting; efficient electrical appliances; installation of condensing boilers; installation of heat pumps; installation of efficient motors; and water heating using solar thermal collectors. Studied publications showing these measures are shown in Table 3.

11. Conclusions

CO2 is the most emitted gas among those that cause the greenhouse effect, accounting for up to 80%. In addition, human activity is the main producer, generating 75% in cities. In particular, 40% is produced in buildings. For this reason, any measure that affects the reduction of its emissions has a multiplier effect and will have a very favorable impact on the improvement of environmental quality. This is the reason why the study of CO2 emissions from buildings is so important.
The works published to date that have calculated or revealed the amounts of CO2 emitted by buildings have been reviewed in this work. A classification of these works has been carried out and they have been grouped by type of building. The sectors and groups presented in the publications have been maintained. These buildings can be dedicated to a tertiary purpose or be residential. In addition, they can be rural or urban. With the classification and review carried out in this paper, researchers have access to the state of the art according to the type of building they are studying.

Author Contributions

Conceptualization, P.J.Z.-P., F.J.Z.-S., I.M.Z.-S. and R.S.-D.; methodology, P.J.Z.-P. and F.J.Z.-S.; validation, P.J.Z.-P., I.M.Z.-S. and F.J.Z.-S.; formal analysis, P.J.Z.-P., F.J.Z.-S., I.M.Z.-S. and J.L.M.-R.; investigation, P.J.Z.-P., F.J.Z.-S. and I.M.Z.-S.; data curation, I.M.Z.-S. and F.J.Z.-S.; writing—original draft preparation, P.J.Z.-P., F.J.Z.-S. and I.M.Z.-S.; writing—review and editing, I.M.Z.-S., F.J.Z.-S. and P.J.Z.-P.; visualization, F.J.Z.-S. and I.M.Z.-S.; supervision, P.J.Z.-P., J.L.M.-R. and R.S.-D.; project administration, P.J.Z.-P.; funding acquisition, J.L.M.-R. All authors have read and agreed to the published version of the manuscript.

Funding

The authors would like to acknowledge the financial support of the Spanish State Research Agency: Project PID2020-116433RB-I00 funding by MCIN/AEI/10.13039/501100011033.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Acknowledgments

The authors are grateful to the reviewers for their valuable comments, since they undoubtedly allowed a better understanding of the work and served to improve it.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Grouping of research papers according to publications.
Figure 1. Grouping of research papers according to publications.
Energies 15 06635 g001
Table 1. Classification of papers.
Table 1. Classification of papers.
GroupPaper
Airport facilities[10]
University centers[11]
Hotel facilities[12,13,14,15,16,17]
Public buildings[18]
Residential buildings
Rural[20,21,22]
Urban[23,24,25,26,27,28,29,30,31,32,33]
Rural and urban[34,35,36,37,38,39,40,41,42,43,44,45,46,47,48]
Direct and indirect emissions[49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66]
Construction sector[67]
Life cycle[69,70]
Emissions simulation[71]
Residential and commercial buildings[72,73,74,75,76,77,78,79,80]
Reviews[81,82,83]
Table 2. Papers that reference factors that most influence the production of emissions.
Table 2. Papers that reference factors that most influence the production of emissions.
GroupPaper
Air conditioning[10,13,16,18,33,42,43,45,47,67,78,80]
Heating[10,13,16,22,33,43,44,45,47,49,65,67,78,80]
Ventilation[10,13,22,45,47,67]
Illumination[10,16,18,33,44,47,49,65,67]
Home appliances[43,44,47,49,66]
Power motors[10,15]
Table 3. Papers that point out measures that reduce emissions.
Table 3. Papers that point out measures that reduce emissions.
GroupPaper
Wall insulation[12,15,18,44,45,67,71]
Substitutions of windows[12,15,18,33,45,71,79]
Efficiency improvements in lighting[12,14,15,18,44,67,71]
Efficient electrical appliances[15,43,44,45,47,48,71]
Installation of condensing boilers[12,15,33,44,45,67,79]
Installation of heat pumps[12,14,45,48,79]
Installation of efficient motors[14,15,48]
Water heating using solar thermal collectors[14,15,45,48,67,79]
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Zarco-Periñán, P.J.; Zarco-Soto, F.J.; Zarco-Soto, I.M.; Martínez-Ramos, J.L.; Sánchez-Durán, R. CO2 Emissions in Buildings: A Synopsis of Current Studies. Energies 2022, 15, 6635. https://doi.org/10.3390/en15186635

AMA Style

Zarco-Periñán PJ, Zarco-Soto FJ, Zarco-Soto IM, Martínez-Ramos JL, Sánchez-Durán R. CO2 Emissions in Buildings: A Synopsis of Current Studies. Energies. 2022; 15(18):6635. https://doi.org/10.3390/en15186635

Chicago/Turabian Style

Zarco-Periñán, Pedro J., Fco Javier Zarco-Soto, Irene M. Zarco-Soto, José L. Martínez-Ramos, and Rafael Sánchez-Durán. 2022. "CO2 Emissions in Buildings: A Synopsis of Current Studies" Energies 15, no. 18: 6635. https://doi.org/10.3390/en15186635

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