Solar water heating installation in conventional water system - has inflowing cold water and outflowing hot water circulation reversed according to hot water supply and solar heating modes

摘要

The heater uses the conventional hot water storage system to store the collected energy. The sense of circulation of water at the cold water entry and at the sanitary hot water exit is inverted according to whether water is drawn from the system or the water is heated by the solar collectors. The drawing of water from the system gives binary electrical data through a pressure contact on a flow contactor. These data are used to control a solenoid valve incorporated in the water circuit of the solar collectors and to also stop the circulation pump. Water is always drawn from the upper part of the tank owing to the sterilisation of the temps. caused by the cold water entry at the lower part of the tank.