Water Temperature Control System For Solarheater Based On Micro Control Unit

With the improvement of living standard and public awareness of environmentalprotection, domestic solar water heaters have been into the average family. The solar waterheater has been the largest and fastest growing products on the market demand for renewableenergy in China. However, the solar water heater exist some problems on the China’s market,eg: single function of control system, complicated operation, inconvenient control, pooranti-interference ability, and poor temperature control. Even with the auxiliary heatingfunction, there will be often heated inadequate or excessive burning. As a result, it will notonly cause great security risk, but also waste a lot of energy.For these reasons, this paper presents a new control scheme of a new solar water heater.The control system is mainly composed by the microcontroller, temperature sensor, hot andcold water solenoid valve, water level switch and temperature settings, alarms and other parts,which doesn’t take into account the auxiliary heating. It is proved that the control system issimple effective and inexpensive. The control system has accurate temperature control, candisplay the current water heater’s temperature and automatically detects the actual temperatureof water heaters, and has the functions of the self-adjust temperature and the constanttemperature.