Solar energy water heating is one of the most mature, practical and economical solar utilization technology which can compete with conventional energy. Solar energy collector is the core component of solar water heater. The device is used to convert solar radiation to thermal which can be used to heat the working fluid. The advantages and disadvantages of flat plate solar collector and vacuum tube collector were compared. And the development trend of solar water heating technology were analyzed.
flat plate solar collectorvacuum tube collectorcoating technology