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Cooling load characteristics of indoor spaces conditioned by decoupled radiant cooling unit with low radiant temperature

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Building Simulation 2022年第12期15卷 2067-2079页

作者： Yuying Liang Nan Zhang Huijun Wu Xinhua Xu Jianming Yang Gongsheng Huang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Department of Building Environment&Energy Engineering Huazhong University of Science and TechnologyWuhanChina School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Decoupled radiant cooling units(DRCUs)are capable of increasing the cooling capacity without increasing condensation risks even using a much lower cooling temperature than conventional radiant cooling units(CRCUs).However,it is unclear whether DRCUs using low radiant cooling temperature will increase the cooling load of the conditioned indoor *** this study,the cooling load characteristics of a thermal chamber conditioned by a DRCU was investigated through developing a steady-state analysis model suitable for both DRCUs and *** total/radiative heat flux,as well as the heat exchange with a thermal manikin and walls were analysed under different surface temperatures of *** effect of the emissivity of the thermal chamber’external wall on the cooling load was also *** indicated that the cooling load under the DRCU was slightly smaller than that under the CRCU when the same operative environment was *** the infrared emissivity of the exterior wall’s inner surface could lead to a significant decrease in the cooling load for both the DRCU and *** decreasing the wall emissivity from 0.9 to 0.1,the total cooling load of the DRCU can be decreased by 8.4%and the heat gain of the exterior wall decreased by 21.6%.This study serves as a reference for developing the analysis model and understanding the load characteristics when DRCUs are used to create the thermal environment for indoor spaces.

关键词： radiant cooling condensation-free computational fluid dynamics cooling load hot and humid climates

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