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thermal environment investigation of asymmetric radiation coupled with convection heating

Building Simulation 2022年第7期15卷 1309-1321页

作者： Man Fan Jia Wang Lanlan Zhang Han Li Xiangfei Kong Chenxiao Zheng School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China State Key Laboratory of Building Safety and Built Environment Beijing 100013China National Engineering Research Center of Building Technology Beijing 100013China School of Mechanical Engineering Tianjin University of CommerceTianjin 300134China

The couple of radiation with convection heating owned advantages of less energy utilization,healthier and more comfortable indoor ***,local thermal discomfort was often induced by large vertical temperature difference and radiation asymmetry *** work studied indoor thermal environment characteristics under different coupling ways of radiation and convection heating terminals through experiments and CFD *** studied five scenarios were denoted as:(Ⅰ)lateral air supply+adjacent side wall radiation,(Ⅱ)lateral air supply+opposite side wall radiation,(Ⅲ)lateral air supply+floor radiation,(Ⅳ)lateral air supply+adjacent side wall radiation+floor radiation,and(Ⅴ)lateral air supply+opposite side wall radiation+floor *** overall thermal comfort indices(including air diffusion performance index(ADPI),predicted mean vote(PMV),and predicted percent of dissatisfaction(PPD))and local thermal comfort indices under different scenarios were *** Scenarios Ⅰ-Ⅲ,the local dissatisfaction rates caused by vertical air temperature difference were 0.4%,0.1%,and 0.2%,respectively,which belonged to"A”class according to the ISO-7730 *** the vertical asymmetric radiation temperature of Scenario Ⅰ-Ⅱ was about 6.5℃ lower than that of Scenario Ⅲ-Ⅳ-Ⅴ.The ADPI for Scenarios Ⅲ-Ⅴ were about respectively 5.7%,16.7%,and 21.0%higher than that of Scenarios Ⅰ-Ⅱ,indicating that a large radiation area and radiation angle coefficient could reduce the discomfort caused by radiant temperature *** coupling mode improved local discomfort by decreasing vertical temperature difference and radiation asymmetry temperature wherefore improving the PMV from-1.6 *** lateral air supply coupled with asymmetric radiation heating could potentially improve the thermal comfort of occupied area,while the comprehensive effect of thermal environmental improvement,energy-saving,and cost-effectiveness needes to be further investigated.

关键词： asymmetric radiation lateral air supply overall thermal comfort-local thermal comfort CFD simulation

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