基于沟槽结构的充液式辐射板供冷性能实验研究
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摘要
本文设计了1种新型沟槽结构充液式冷辐射板,并开展了辐射板供冷性能的实验研究。实验结果表明:沟槽结构及内部充液设计,可强化冷水与辐射板表面间的换热,显著提高辐射板表面温度分布的均匀性,消除局部低温,从而实现较好的热舒适性。在实验小室室温为27~34℃,冷水供水温度为15~17℃,供水流量为0.1~0.2 L/s时,本辐射板单位面积供冷量可达260~720 W/m2。实验工况下辐射板表面温度较为均匀,最大温差为2.9℃,辐射板下部垂直方向上温度梯度小于3℃/m。
A new type of grooved cold radiant panel filled with liquid is designed in this paper. The experimental study on the cooling performance of the radiant panel has been carried out and the research results show that the groove structure and liquid filled inside the channel can enhance the heat transfer between the cold water and the outer surface,significantly improve the uniformity of the surface temperature of the radiant panel,and eliminate the local low temperature. Therefore,the radiant panel has high thermal comfort in practical application. When the temperature of the chamber is 27 ~ 34 ℃,the water supply temperature will be 15 ~ 17 ℃ and the water supply flow rate will be 0. 1 ~ 0. 2 L/s,and the cooling capacity per unit area can reach 260 ~ 720 W/m2. The radiation wall temperature distribution is uniform,with the maximum temperature difference being 2. 9 ℃. The temperature gradient in the vertical direction below the radiant panel is lower than 3 ℃/m.
A new type of grooved cold radiant panel filled with liquid is designed in this paper. The experimental study on the cooling performance of the radiant panel has been carried out and the research results show that the groove structure and liquid filled inside the channel can enhance the heat transfer between the cold water and the outer surface,significantly improve the uniformity of the surface temperature of the radiant panel,and eliminate the local low temperature. Therefore,the radiant panel has high thermal comfort in practical application. When the temperature of the chamber is 27 ~ 34 ℃,the water supply temperature will be 15 ~ 17 ℃ and the water supply flow rate will be 0. 1 ~ 0. 2 L/s,and the cooling capacity per unit area can reach 260 ~ 720 W/m2. The radiation wall temperature distribution is uniform,with the maximum temperature difference being 2. 9 ℃. The temperature gradient in the vertical direction below the radiant panel is lower than 3 ℃/m.
引文
[1]Novoselac A,Srebric J.A critical review on the performance and design of combined cooled ceiling and displacement ventilation systems[J].Energy&Buildings,2002,34(5):497-509
[2]Stetiu C.Radiant cooling in US office buildings:Towards eliminating the perception of climate-imposed barriers[R].Office of Scientific&Technical Information Technical Reports,1998:1-4
[3]韩星,张旭,杨洁,等.采用常规冷水机组作为冷源的辐射供冷加新风系统形式分析及能耗计算[J].建筑科学,2007,23(10):40-43
[4]Qi J K,Kho S J,Abdullah J,et al.Evaluation of energy conservation potential and complete cost-benefit analysis of the slab-integrated radiant cooling system:A Malaysian case study[J].Energy&Buildings,2017,138:165-174
[5]Ning B,Chen Y,Liu H,et al.Cooling capacity improvement for a radiant ceiling panel with uniform surface temperature distribution[J].Building&Environment,2016,102:64-72
[6]Yuan Y,Zhang X,Zhou X.A study on inherent correlation of thermal performances and condensation free control of the radiant system[J].Energy&Buildings,2016,129:19-31
[7]黄立志,李念平,何颖东,等.不同辐射供冷方式下室内热舒适和能耗模拟分析[J].建筑科学,2017,33(8):90-96
[8]国际标准化组织.ISO 7730-2005适中的热环境—PMV与PPD指标的确定及热舒适条件的确定[s].2005:7
[2]Stetiu C.Radiant cooling in US office buildings:Towards eliminating the perception of climate-imposed barriers[R].Office of Scientific&Technical Information Technical Reports,1998:1-4
[3]韩星,张旭,杨洁,等.采用常规冷水机组作为冷源的辐射供冷加新风系统形式分析及能耗计算[J].建筑科学,2007,23(10):40-43
[4]Qi J K,Kho S J,Abdullah J,et al.Evaluation of energy conservation potential and complete cost-benefit analysis of the slab-integrated radiant cooling system:A Malaysian case study[J].Energy&Buildings,2017,138:165-174
[5]Ning B,Chen Y,Liu H,et al.Cooling capacity improvement for a radiant ceiling panel with uniform surface temperature distribution[J].Building&Environment,2016,102:64-72
[6]Yuan Y,Zhang X,Zhou X.A study on inherent correlation of thermal performances and condensation free control of the radiant system[J].Energy&Buildings,2016,129:19-31
[7]黄立志,李念平,何颖东,等.不同辐射供冷方式下室内热舒适和能耗模拟分析[J].建筑科学,2017,33(8):90-96
[8]国际标准化组织.ISO 7730-2005适中的热环境—PMV与PPD指标的确定及热舒适条件的确定[s].2005:7