In order to better understand the real-life thermal performance of Solar domestic hot water (SDHW) systems, SDHW systems installed in dormitories in a university were selected for on-line monitoring. There are 50 dormitory buildings in this university, and each building contains around 430 students. A SDHW system is installed in each building, using the glass evacuated solar tube collector, with an average collector area of 260 m2 . Air source heat pumps are used as auxiliary heat sources in the collector side. All SDHW systems were equipped with data logging system and remotely monitored with online data. Thermal performance analysis and economic analysis of SDHW systems were presented in this paper. The results show that the thermal performance and economy of SDHW systems for dormitory buildings are very good because the domestic hot water demand of student dormitories is relatively concentrated in time and space. Therefore, SDHW systems has a good application prospect in dormitory buildings.
Keywords solar domestic hot water system, dynamic thermal performance, comprehensive evaluation, dormitory building