Cascade heat pump for heating water and for cooling or...

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 29/00 (2006.01) F24D 5/12 (2006.01) F24D 17/02 (2006.01) F25B 7/00 (2006.01) F25B 30/02 (2006.01)

Patent

CA 1175251

Title CASCADE HEAT PUMP FOR HEATING WATER AND FOR COOLING OR HEATING A COMFORT ZONE Inventor James C. Wendschlag Abstract A heat pump system and method, wherein the system may be operated in cascade fashion to heat water using heat extracted from relatively cold outdoor ambient air, or in non-cascade fashion to provide supplemental heating or cooling in a comfort zone. The system uses a first and a second refrigerant fluid with separate compression cycle loops passing in heat transfer relationship through a tri- fluid heat exchanger. In a first mode of operation, the first refrigerant fluid condensed while heating water is vaporized in the tri-fluid heat exchanger to cool air supplied to the comfort zone, and in a second mode the first refrigerant fluid is vaporized by heat rejected from con- densing the second refrigerant fluid. In a third mode, wherein only the second refrigerant loop is operative, air passing through the tri-fluid heat exchanger to the com- fort zone is heated by condensation of the compressed second refrigerant fluid.

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