| With the acceleration of Chinese industrialization and urbanization process and the improvement of people’s living standards,people’s rigid demand for energy is growing rapidly,while the rapid increase in energy consumption has brought carbon dioxide,sulfur dioxide,nitrogen oxides,smoke and dust,etc.The massive discharge of pollutants has led to increasingly serious environmental and ecological problems,which have affected the sustainable development of the economy and society.At the same time,excessive pursuit of energy saving and abandonment of indoor air quality have led to serious building sickness syndrome and other related building air-conditioning diseases.In this context,it is particularly important to design and develop passive ventilation and air-conditioning technologies that utilize a variety of renewable energy sources.The passive ventilation and air-conditioning system studied should be able to provide fresh air for the building and regulate the indoor thermal environment.The coupling system composed of solar chimney and earth to air heat exchanger(SC-EAHE coupling system)can use solar energy and geothermal energy at the same time,and use the time delay between the temperature of a certain depth of the ground and the surface temperature to pre-cool and pre-heat the outdoor air.At the same time,solar chimneys that absorb solar radiation are used to provide driving force for the natural ventilation of the system,which can meet the requirements of passive ventilation and air conditioning technology.The system can significantly improve the indoor thermal environment in summer,preheat outdoor air in winter,and maintain stable indoor air temperature during transitional seasons,thereby greatly reducing building air conditioning energy consumption.The solar chimney is used in conjunction with the building envelope to provide driving force for the natural ventilation of the system for 24 hours.This paper uses the method of experimental testing to study the feasibility and applicability of the SC-EAHE coupling system in different seasons and different working conditions combined with the heat storage of the building envelope for natural ventilation.The main contents are as follows:(1)A full-scale experimental platform was built to verify the feasibility of the SCEAHE coupling system combined with the heat storage natural ventilation of the building envelope in different seasons and different working conditions.(2)Through the daily cycle test of the natural ventilation of the SC-EAHE coupling system in summer with different EAHE pipe diameters,the influence of different EAHE pipe diameters on the system’s ventilation capacity,EAHE cooling capacity,indoor temperature and other parameters is compared.At the same time,it discusses the natural ventilation principle of the SC-EAHE coupling system,that is,the natural ventilation process of the building envelope and the heat pressure produced by the solar chimney act simultaneously,alternately leading,and analyze the role of different buoyancy forces in the natural ventilation process and its influence changes in natural ventilation and cooling performance of the coupled system.(3)Through the test of the SC-EAHE coupling system running in summer and winter for a long period of time,the parameters of the system,such as soil temperature,air temperature and speed,internal and external surface temperature of the enclosure structure,are analyzed under the influence of the outdoor environment in winter and summer.The SC-EAHE coupling system’s long-period operation in winter and summer during the long-period operation of ventilation changes,the pre-cooling/pre-heating potential of outdoor air,and the change of ground temperature are studied.The feasibility of long-term operation of the SC-EAHE system in typical summer and winter seasons is discussed.(4)Through the test of the SC-EAHE coupling system in different working conditions of the daily cycle of the transition season,the impact of using EAHE or direct opening of the window and the size of the window area on the ventilation volume and indoor thermal environment in the transition season is analyzed and compared.The applicability of the SC-EAHE coupling system for natural ventilation in the transitional season was discussed. |
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