thermostat controller Flat-plate collector eat exchanger storage Antifreeze water A circulating-liquid solar collector system that provides hot water for space heating and domestic use. In a typical installation the collector will be on the roof of a building with the other components in an inside utility area 复旦大学环境科学与工程系 Department of Environmental Science and Engineering, Fudan UniversityA circulating-liquid solar collector system that provides hot water for space heating and domestic use. In a typical installation the collector will be on the roof of a building with the other components in an inside utility area