Forced Circulation Solar Water Heater
----------------------------------------

Name of the Components:-

1)Insulted tank 2)Auxiliary heater 3)Temperature sensor 4)Non return valve 5)Cold water supply system 6)Pump 7)Solar collector.

Forced Circulation Solar Water Heater

Solar Dryer
Theory

Forced circulation water heating system is suitable for supplying hot water to community center such as hotels, hostels and small industries. Array of flat-plate collectors are used and forced circulation is maintained with a water pump. The restriction to keep storage at higher level is not required. Depending on the size of storage tank, a group of flat plate collectors are selected and connected together in a panel.

The pump for maintaining the forced circulation is operated by an on-off controller, which senses the difference between the temperature of water at the exit of collectors and suitable location inside the storage tank.
A control unit permits the pump to operate only when the temperature of the water at the bottom of the tank is below that of the water in the upper header. A check valve is needed to be prevents reverse circulation. Auxiliary heater is provided to supplement the heating procedure in the night time and cloudy day.

To prevent the problem of freezing an anti-freezing solution is added, as the heat transport is medium.

Conclusion:

This type of solar water heaters is very suitable on large scale hot-water supply requirements.


Commercial Use of Solar Water Heater

Industrial Solar Water Heating system

Solar Heating Water Diagram

Solar Water Heater on the Roof