| Due to the problems of excessive heating energy consumption and serious environmental pollution in rural residential buildings based on decentralized heating in cold regions of northwest China,this paper proposes a shallow geothermal combined solar collector wall system based on passive solar houses.A new type of application of the combined shallow geothermal energy,on the one hand,utilizes a solar collector wall system to increase or decrease the indoor temperature,and on the other hand,uses the basement to adjust the heat in the upper room to improve the thermal comfort of the room.This paper selects the field test and numerical simulation method to study the operating conditions of the shallow geothermal joint solar collector wall system,and uses the passive solar energy test house of the experimental site of Shihezi University in Shihezi City,Xinjiang Province as the object,to study and test its optimal heating ventilation.Operating mode.In addition,one common farm house with the same floor area,structure and layout as the experimental house was selected as the control room for the corresponding thermal parameters test.In summer,the cooling effects of three ventilation modes and three ventilation times were compared and analyzed.The test results show that the indoor average temperature of the ventilation mode C3 using the shallow geothermal combined solar collector wall system is obviously better than other modes,the average temperature is reduced by 2.64 °C,and the passive cooling effect is better than the C5 mode with a ventilation time of 12 h.The other two models,and with the extension of the ventilation time,the passive cooling effect has declined.In winter,the heating effect under three different heating modes and different weather conditions(sunny days,cloudy days)was compared and analyzed.The test results show that the heating effect of the shallow geothermal combined solar collector wall heating mode C8 is better than other modes;on sunny days,the indoor temperature of the experimental house is basically maintained at 9.4 ~ 13 °C,and the room temperature during the day has 5 h ? 12 °C,basically meets the demand for heating of rural houses in the winter in the region;on cloudy days,the room temperature in the test room changes steadily throughout the day,basically maintaining around 4.3 °C;when the outdoor weather is sunny and the air quality index(AQI)When meeting the secondary standard limits,the test houses can rely on the shallow geothermal joint solar collector wall system to meet the indoor temperature requirements in October and November in the heating period,and in March and April in the following year.The effect is significant.At the same time,the numerical calculation method was used to simulate the shallow geothermal joint solar collector wall system.The effect of additional basement on the heating and ventilation effect of the solar pilot house in winter and summer was analyzed.The solar collector wall,the lower vent and the basement roof vent were analyzed.The effect of the on time on the system operation.The results of numerical simulation show that the shallow geothermal combined solar collector wall system is better than the solar collector wall system for heating and ventilation;it is suggested that the passive solar solar collector wall of the shallow geothermal combined solar collector wall system be used in the rural residential areas of Xinjiang in severe cold regions.The vents on the lower and upper vents and the roof vents in the basement are suitable for operation at about 12:00-13:00 and closed at about 18:00-19:00 in the afternoon.The vents on the roof of the basement should be at 0:00-8:00 in the evening.Segments remain open.This study provides a simple and practical technical reference for the selection and optimization of the heating and ventilation modes of the passive solar houses in the passive solar houses using the shallow geothermal combined solar collector wall system in the severe cold regions of Xinjiang. |
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