| 摘要 |
A vapor compression heat pump system comprising a lower temperature heat exchanger, a higher temperature heat exchanger and a compression path control (CPC) system. The CPC system increases the coefficient of performance (COP) obtainable with so me refrigerants, the environmentally benign refrigerant 718 (water) being an outstanding example. This is achieved by the controlled alteration of the quality of the suction vapor prior to compression so that the resulting path of compression entails a reduced work requirement relative to the refrigerating effect obtained. When the system i s employed with refrigerant 718 (water) the resulting COP is higher than those of the halo carbon refrigerants phased out by international agreement. Thus it offers improved performance as well as security against any future restrictions due to refrigerant environmental effects. The heat pump system can be used for heating or cooling or simultaneous heating and cooling; e.g., air conditioning and water heating. It is also readily adaptable to variable compression ratio operation, such as that which would result from providing the higher temperature heat exchanger with the capability of switching between sinks at different temperatures.
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