摘要
In this paper,the performance of a solar thermal system with a focus on space heating was investigated.A 70 m^(2) detached house was considered in the weather conditions of the city of Tehran,Iran.A thermosyphon solar water heater with a flat plate collector combined with an auxiliary electrical heater supplies the heating demand of the house.The proposed system was modeled and analyzed using TRNSYS software.In this regard,the TRNBuild module was employed for the building load calculation.The model has been simulated for one year of operation.The effects of the solar collector’s surface area and storage volume were assessed.The results show that for a solar collector with a 15 m^(2) surface area,the solar fraction is 0.29 in January,during which the solar radiation is the lowest.Using solar collectors of10 m^(2) and 5 m^(2) surface areas,the solar fraction falls to 0.23 and 0.14,respectively in January.Besides,two cases of 150 L and 300 L storage tanks are taken into account.Eventually,it is found that using a 15 m^(2) solar collector and a 150 L storage tank can appropriately provide the building’ s heating demand taking the thermal performance and economic aspects into consideration.
本文研究了空间采暖太阳能集热系统的性能。在伊朗德黑兰城市的天气条件下,以一座70m^(2)的独立住宅为研究对象。住宅的供暖需求由带有平板集热器和辅助电加热器的热虹吸太阳能热水器系统供应。采用TRNSYS软件对该系统进行建模和分析。采用TRNBuild模块进行建筑荷载计算,并对该模型进行一年的运行模拟。评估了太阳能集热器表面积和存储体积的影响。结果表明:对于表面积为15m^(2)的太阳能集热器,1月份的太阳辐射率最低,为0.29。对于表面积为10m^(2)和5m^(2)的太阳能集热器,1月份的太阳辐射率分别降至0.23和0.14。此外,还考虑了150 L和300 L的储罐两种情况。最终,考虑到热性能和成本,使用一个15m^(2)的太阳能集热器和一个150 L的储罐可以满足建筑的采暖需求。
