高温高湿地区太阳能烟囱-土壤/空气换热器夏季自然通风系统实验研究
摘要：搭建了全尺寸实验平台，通过测试通风量、空气温度、空气相对湿度、地埋管制冷量、集热面温度、太阳辐照度等参数24 h内的变化，研究了高温高湿环境下土壤/空气换热器(EAHE)与太阳能烟囱(SC)耦合系统的通风和冷却能力。结果表明：尽管EAHE进口空气的温度和相对湿度分别为27～41℃和42.18%～95.58%,但其出口空气温度和相对湿度都较稳定，分别为27～28℃和90%～95%;空气通过EAHE埋管的最大温降为13℃,含湿量最大减小值为3.1 g/kg; EAHE的最大总制冷量为994 W,最大显热制冷量为750 W,最大潜热制冷量为317 W,最大潜热制冷量约占总制冷量的32%;系统最大通风量为166 m3/h,对应的太阳辐照度最大值为1 194 W/m2;该耦合系统在高温高湿地区应用有良好的降温性能。
关键词：高温高湿地区土壤/空气换热器太阳能烟囱实验测试自然通风制冷系统
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[3] WEI H B,DONG Y,WANG J L B,et al.Field experiments on the cooling capability of earth-to-air heat exchangers in hot and humid climate[J].Applied energy,2020,276:115493.
[4] DONG Y,ZHANG J P.Analysis and experiments on the periodically fluctuating air temperature in a building with earth-air tube ventilation[J].Building and environment,2015,85:29- 39.
[5] LIU S L,LI Y C.An experimental study on the thermal performance of a solar chimney without and with PCM[J].Renewable energy,2015,81(C):338- 346.
[6] LI Y C,LIU S L,LU J.Effects of various parameters of a PCM on thermal performance of a solar chimney[J].Applied thermal engineering,2017,127:1119- 1131.
[7] MAEREFAT M,HAGHIGHI A P.Passive cooling of buildings by using integrated earth to air heat exchanger and solar chimney[J].Renewable energy,2010,35(10):2316- 2324.
[8] LI H R,YU Y B,NIU F X,et al.Performance of a coupled cooling system with earth-to-air heat exchanger and solar chimney[J].Renewable energy,2014,62:468- 477.
[9] YU Y B,LI H R,NIU F X,et al.Investigation of a coupled geothermal cooling system with earth tube and solar chimney[J].Applied energy,2014,114:209- 217.
[10] GAN G H.Simulation of dynamic interactions of the earth-air heat exchanger with soil and atmosphere for preheating of ventilation air[J].Applied energy,2015,158:118- 132.
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Experimental study on solar chimney-earth-air heat exchanger in high temperature and high humidity zones in summer
Abstract: A full-scale experimental platform is built. By testing the changes of parameters such as ventilation volume, air temperature, air relative humidity, buried pipe cooling capacity, collector surface temperature and solar irradiance within 24 hours, the ventilation and cooling capacity of the coupled system of earth-air heat exchanger(EAHE) and solar chimney in high temperature and high humidity environment is studied. The results show that although the inlet air temperature and relative humidity of EAHE are 27 to 41 ℃ and 42.18% to 95.58%, respectively, the outlet air temperature and relative humidity are relatively stable, which are 27 to 28 ℃ and 90% to 95%, respectively. The maximum temperature drop of the air passing through the EAHE buried pipe is 13 ℃, and the maximum moisture content reduction value is 3.1 g/kg. The maximum total cooling capacity of EAHE is 994 W, the maximum sensible heat cooling capacity is 750 W, the maximum latent heat cooling capacity is 317 W, and the maximum latent heat cooling capacity accounts for about 32% of the total cooling capacity. The maximum ventilation capacity of the system is 166 m3/h, and the corresponding maximum solar irradiance is 1 194 W/m2. The coupled system has good cooling performance in high temperature and high humidity zones.
Keywords: high temperature and high humidity zone; earth-air heat exchanger; solar chimney; experimental test; natural ventilation; cooling system;
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