Desuperheater

A desuperheater is a secondary heat exchanger that transfers heat from the earth in the winter, and from your home in the summer, into your domestic hot water tank. The desuperheater is part of the geothermal heat pump's domestic hot water generating system.

Hot water generators only heat domestic water when your geothermal heat pump is heating or cooling your home. The hot water generator's water circulating pump moves the cold water from the bottom of your hot water tank through a water pipe to the desuperheater itself, where the water is heated by the heat that has been transferred from the earth when you are heating your home, and from the inside of your home when you are cooling your home. The heated water is then circulated back into your hot water tank.

For more details refer: Product/Manuals/Desuperheater

Not directly useful in solar heating system.....

Thank you sir for your response and useful docs.