Review and development of the contribution ratio of indoor climate (CRI)
An indoor thermal environment is affected by various heat elements, such as heat transfer through walls, solar radiation, and heat emissions from people, lighting and equipment. To promote both local thermal comfort and building energy efficiency, demand-oriented ventilation (such as personalized ve...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2022-10-01
|
| Series: | Energy and Built Environment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666123321000374 |
| _version_ | 1811291965002612736 |
|---|---|
| author | Weirong Zhang Yanan Zhao Peng Xue Kunio Mizutani |
| author_facet | Weirong Zhang Yanan Zhao Peng Xue Kunio Mizutani |
| author_sort | Weirong Zhang |
| collection | DOAJ |
| description | An indoor thermal environment is affected by various heat elements, such as heat transfer through walls, solar radiation, and heat emissions from people, lighting and equipment. To promote both local thermal comfort and building energy efficiency, demand-oriented ventilation (such as personalized ventilation) has been developed. When using this method, a good understanding on indoor temperature distribution becomes necessary. For this purpose, an index known as Contribution Ratio of Indoor Climate (CRI) has been developed through extraction from the calculation results of Computational Fluid Dynamics (CFD). This index can be used to analyze the independent contribution of each heat element to indoor temperature distribution. In this paper, a complete and detailed introduction of the CRI is given, including its basic premises, definitions, and mathematical meaning. Particularly, calculation method of the CRI in natural convection airflow fields is further developed. Two cases (forced and natural convection airflow fields) have been carried out in different scenarios, with results showing that the CRI of a heat source had higher values in the area around itself. Also, it had a larger influence range in forced convection airflow field because of the convective airflow, while relatively larger CRI values only appear in the area above the heat source in the natural convection airflow field because of the heat plume. As a useful index for understanding the form of indoor temperature field, the CRI has guiding significance for regulating air-conditioning/ventilation systems to build better indoor thermal environment. |
| first_indexed | 2024-04-13T04:37:14Z |
| format | Article |
| id | doaj.art-e55d17db23324e6aaccf130fcea2083c |
| institution | Directory Open Access Journal |
| issn | 2666-1233 |
| language | English |
| last_indexed | 2024-04-13T04:37:14Z |
| publishDate | 2022-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Energy and Built Environment |
| spelling | doaj.art-e55d17db23324e6aaccf130fcea2083c2022-12-22T03:02:07ZengKeAi Communications Co., Ltd.Energy and Built Environment2666-12332022-10-0134412423Review and development of the contribution ratio of indoor climate (CRI)Weirong Zhang0Yanan Zhao1Peng Xue2Kunio Mizutani3Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, China; Corresponding author.Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, ChinaKey Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing, ChinaJoint Usage/Research Center Wind Engineering Research Center Tokyo Polytechnic University, Tokyo Polytechnic University, Tokyo, JapanAn indoor thermal environment is affected by various heat elements, such as heat transfer through walls, solar radiation, and heat emissions from people, lighting and equipment. To promote both local thermal comfort and building energy efficiency, demand-oriented ventilation (such as personalized ventilation) has been developed. When using this method, a good understanding on indoor temperature distribution becomes necessary. For this purpose, an index known as Contribution Ratio of Indoor Climate (CRI) has been developed through extraction from the calculation results of Computational Fluid Dynamics (CFD). This index can be used to analyze the independent contribution of each heat element to indoor temperature distribution. In this paper, a complete and detailed introduction of the CRI is given, including its basic premises, definitions, and mathematical meaning. Particularly, calculation method of the CRI in natural convection airflow fields is further developed. Two cases (forced and natural convection airflow fields) have been carried out in different scenarios, with results showing that the CRI of a heat source had higher values in the area around itself. Also, it had a larger influence range in forced convection airflow field because of the convective airflow, while relatively larger CRI values only appear in the area above the heat source in the natural convection airflow field because of the heat plume. As a useful index for understanding the form of indoor temperature field, the CRI has guiding significance for regulating air-conditioning/ventilation systems to build better indoor thermal environment.http://www.sciencedirect.com/science/article/pii/S2666123321000374Contribution Ratio of Indoor Climate (CRI)CFDIndoor thermal environmentSensitivity analysisVentilation |
| spellingShingle | Weirong Zhang Yanan Zhao Peng Xue Kunio Mizutani Review and development of the contribution ratio of indoor climate (CRI) Energy and Built Environment Contribution Ratio of Indoor Climate (CRI) CFD Indoor thermal environment Sensitivity analysis Ventilation |
| title | Review and development of the contribution ratio of indoor climate (CRI) |
| title_full | Review and development of the contribution ratio of indoor climate (CRI) |
| title_fullStr | Review and development of the contribution ratio of indoor climate (CRI) |
| title_full_unstemmed | Review and development of the contribution ratio of indoor climate (CRI) |
| title_short | Review and development of the contribution ratio of indoor climate (CRI) |
| title_sort | review and development of the contribution ratio of indoor climate cri |
| topic | Contribution Ratio of Indoor Climate (CRI) CFD Indoor thermal environment Sensitivity analysis Ventilation |
| url | http://www.sciencedirect.com/science/article/pii/S2666123321000374 |
| work_keys_str_mv | AT weirongzhang reviewanddevelopmentofthecontributionratioofindoorclimatecri AT yananzhao reviewanddevelopmentofthecontributionratioofindoorclimatecri AT pengxue reviewanddevelopmentofthecontributionratioofindoorclimatecri AT kuniomizutani reviewanddevelopmentofthecontributionratioofindoorclimatecri |