Heating system, powered directly by solar energy, has a second heater on stand-by during sunlight hours linked to the system through a three-way valve and using a recirculating heat-carrier medium

摘要

The heating system (1), heated directly by solar energy, has a second oil or gas or electric heat generator (2) in a pipe system (3), without system separation. The solar energy and second heat generator are separated by a three-way valve (4). The magnetic valve unit (9) is closed without current and, when the solar pump (7) has no current, the three-way valve blocks the path to the heating circuit (6). With sunlight, a temperature difference switch gives a direct heating on the heating circuit, and the second heater is switched to stand-by. The heat carrier is a recirculating mixture of water and glycol.