Heat pump

A heat pump installation including at least three heat pumps each including a compressor, condenser and evaporator, said heat pump installation utilizing as a source of low grade heat waste heat generated by an internal combustion engine and including as such source of low grade heat at least two heat exchangers, one of said heat exchangers arranged to extract heat from the exhaust gases of the internal combustion engine and the other from the engine coolant system such that one of said heat exchangers for extracting heat from the exhaust gases includes two coils each forming the evaporator of separate heat pumps and any one of said heat exchangers comprises an inner chamber through which such exhaust gases are ducted, an outer chamber surrounding said inner chamber, and evaporator coils in both said inner and outer chambers.

A heat pump installation comprising at least three heat pumps each having a compressor, condenser and evaporator for refrigerant, at least one of said condensers comprising coaxial tubing with a liquid to be heated flowing in one direction in the outer tubing and a refrigerant flowing in the opposite direction in the inner tubing, said heat pumps each utilizing as a source of low grade heat waste heat generated by an internal combustion engine and including as such source of low grade heat at least two heat exchangers, one of said heat exchangers arranged to extract heat from the exhaust gases of the internal combustion engine and the other of said heat exchangers arranged to extract heat from the exhaust gases of the internal combustion engine and the other of said heat exchangers arranged to extract heat from the engine coolant system, said heat exchangers forming the evaporators of respective heat pumps, said one of said heat exchangers arranged to extract heat from the exhaust gases including two coils each forming the evaporator of separate heat pumps, and at least one of said heat exchangers including an inner chamber through which such exhaust gases are ducted, an outer chamber surrounding said inner chamber, and evaporator coils in both said inner and outer chambers.

In a heat pump installation, including a compressor, condenser and evaporator, utilizing as a source of waste heat, waste heat in a duct from a kitchen appliance or the like, said evaporator being positioned in said duct and comprising a coil formed into a conical shape, said compressor and said condenser being immersed in a liquid bath, said liquid bath including therein a second heat pump for a room heating or air conditioning system.