Heat pump for heating and cooling - has hot and cold water branches and three-way valves operated in cascade

摘要

The heat pump for heating and cooling purposes has a compressor (Co), a condenser (c), an evaporator (L) and a pressure reduction valve (D), around which the refrigerant is circulated, and a hot water circuit with a pump (Pc) which passes the water through a three-way valve (4) and heat exchangers (Bc), with a by-pass line (7) across them and a return line (9), and also through a cold circuit with another three-way valve (15) in series with the evaporator (E) and a cold unit (BF). It has also a by-pass line (12) and a return line (14). The whole is controlled by a heat regulator connected to the hot section and a multi-stage thermostat (RE) at the cold section, operated by the compressor. The two three-way valves are operated in cascade.