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Research Article

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

Yuying Liang1, Nan Zhang1, Huijun Wu2, Xinhua Xu3, Jianming Yang4, Gongsheng Huang1( )
Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
Department of Building Environment & Energy Engineering, Huazhong University of Science and Technology, Wuhan, China
School of Automation, Guangdong Polytechnic Normal University, Guangzhou 510665, China
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Abstract

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 spaces. In 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 CRCUs. The total/radiative heat flux, as well as the heat exchange with a thermal manikin and walls were analysed under different surface temperatures of DRCUs. The effect of the emissivity of the thermal chamber' external wall on the cooling load was also investigated. Results indicated that the cooling load under the DRCU was slightly smaller than that under the CRCU when the same operative environment was created. Decreasing 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 CRCU. By 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.

Keywords

computational fluid dynamicscooling loadradiant coolingcondensation-freehot and humid climates

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Building Simulation
Volume 15 Issue 12,
December 2022
Pages 2067-2079
DOI: 10.1007/s12273-022-0919-7
Cite this article:
Liang Y, Zhang N, Wu H, et al. Cooling load characteristics of indoor spaces conditioned by decoupled radiant cooling unit with low radiant temperature. Building Simulation, 2022, 15(12): 2067-2079. https://doi.org/10.1007/s12273-022-0919-7

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Received: 28 March 2022
Revised: 16 June 2022
Accepted: 27 June 2022
Published: 12 July 2022
© Tsinghua University Press 2022
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