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Energies
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Energy Conservation in Buildings: Renewable Energy Utilization Method
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Energy Conservation in Buildings: Renewable Energy Utilization Method

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "G: Energy and Buildings".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4008

Special Issue Editors

Prof. Dr. Fenghao Wang

E-Mail Website
Guest Editor
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: energy conservation in buildings; heating, ventilation, and air-conditioning technology; geothermal and air-source heat pump; renewable energy heating system
Prof. Dr. Yanfeng Liu

E-Mail Website
Guest Editor
School of Building Services Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China
Interests: solar energy utilization; building energy conservation; heat and humidity transfer in buildings; energy storage and integrated energy system optimization; human thermal comfort

Special Issue Information

Dear Colleagues,

In recent years, countries worldwide have consistently invested in energy technology and developed highly efficient, decarbonized, and renewable solutions. It is worth noting that the building sector for heating, ventilation, and air-conditioning accounts for about 40% of the total energy consumption, leading to a significant environmental impact in CO2 emission. For building systems, renewable energy has attracted growing applications due to its stability, environmental friendliness, and wide availability, possessing a considerable potential in reducing the carbon emission.

This special issue will be of interest to researchers all over the world pursuing a technology transition toward renewable solutions in building energy conservation (e.g., various heat pumps, solar energy, high-performance building simulations, load prediction).

In this Special Issue, potential topics may include but are not limited to the following:

(a). Methods, implements, prospects to simulate/design/operate renewable energy systems in buildings;

(b). Heat-pump technology: ground-source, air-source, water-source, etc.;

(c). Building performance simulation toward renewable facilities;

(d). Various renewable energy applications in buildings: solar, geothermal, etc.;

(e). State-of-the-art load prediction technology for buildings;

(f). Methods for operation and system control in buildings.

Prof. Dr. Fenghao Wang
Prof. Dr. Yanfeng Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • building energy conservation
  • renewable energy solutions
  • geothermal and air-source heat pump
  • solar energy utilization
  • building performance simulation
  • heating/cooling load prediction

Published Papers (2 papers)

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Research

19 pages, 948 KiB  
Article
Numerical Study on the Long-Term Performance and Load Imbalance Ratio for Medium-Shallow Borehole Heat Exchanger System
by Ruifeng Wang, Fenghao Wang, Yuze Xue, Jinghua Jiang, Yuping Zhang, Wanlong Cai and Chaofan Chen
Energies 2022, 15(9), 3444; https://doi.org/10.3390/en15093444 - 9 May 2022
Cited by 8 | Viewed by 1701
Abstract
To contribute to the goal of carbon neutralization, the closed-loop borehole heat exchanger system is widely applied to use geothermal energy for building cooling and heating. In this work, a new type of medium-shallow borehole heat exchanger (MSBHE) is proposed, which is coaxial [...] Read more.
To contribute to the goal of carbon neutralization, the closed-loop borehole heat exchanger system is widely applied to use geothermal energy for building cooling and heating. In this work, a new type of medium-shallow borehole heat exchanger (MSBHE) is proposed, which is coaxial type and has a depth range between 200 m to 500 m. To investigate the long-term performance of MSBHE in the area with unbalanced cooling and heating load of buildings and the sustainable load imbalance ratio under different design parameters, a comprehensive numerical model is established. The results show that the drilling depth significantly influences the sustainable load imbalance ratio of MSBHE. As the drilling depth is increased from 200 m to 500 m, the load imbalance ratio of the MSBHE increases from 20.76% to 60.29%. In contrast, the load imbalance ratio is always kept at the same level with different inlet velocities and operation modes. Furthermore, in a 9-MSBHE array system, the heat exchanger located in the middle of the array has the lowest load imbalance ratio of 48.97%, which is 15.98% lower than the borehole in the edge location. This is caused by the significant influence of the shifted-load phenomenon among MSBHEs in an array system. The findings of the work imply that this newly proposed MSBHE can sustain a notable load imbalance ratio, which is particularly applicable to the areas with a strong imbalance of annual building load. Full article
(This article belongs to the Special Issue Energy Conservation in Buildings: Renewable Energy Utilization Method)
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18 pages, 3623 KiB  
Article
Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
by Chao Huan, Sha Zhang, Xiaoxuan Zhao, Shengteng Li, Bo Zhang, Yujiao Zhao and Pengfei Tao
Energies 2021, 14(21), 7400; https://doi.org/10.3390/en14217400 - 5 Nov 2021
Cited by 4 | Viewed by 1675
Abstract
The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which can be used as the heat supply for buildings in mines and the surrounding [...] Read more.
The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which can be used as the heat supply for buildings in mines and the surrounding areas. The efficient performance of this system strongly depends on the thermal exchange process between the HET and its surrounding cemented paste backfill body (CPB). In this study, a validated simulation model is established to investigate the heat exchange performance of CPB, in which the nonuniformly distributed thermal properties in CPB are fully considered. The results indicate that the increase in the porosity has a negative effect on the heat exchange performance of CPB. With the increase in the porosity, the decreased rate of the conductive heat transfer in CPB could be up to approximately 18%. In conditions with seepage flow, the heat transfer capacity of CPB could be effectively improved. Generally, a higher hydraulic conductivity corresponds to a higher heat transfer performance of CPB. When the seepage velocity rose from 2 × 10−6 to 6 × 10−6 m/s, the thermal conductivity of CPB achieved a 114% increase from 1.843 to 3.957 W/(m·K). Furthermore, it was found that the thermal energy accumulates along the seepage flow direction, enhancing the thermal influencing radius of the HET in this direction. Thus, the arrangement of HETs should fully take into account the seepage flow effect. This proposed simulation model could provide a reference for parameter determination and optimization of CMBG systems. Full article
(This article belongs to the Special Issue Energy Conservation in Buildings: Renewable Energy Utilization Method)
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