| 摘要 |
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 condensing 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 comfort zone is heated by condensation of the compressed second refrigerant fluid.
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