| 摘要 |
In disclosed embodiments of this invention, the main flow of refrigerant is subcooled by another refrigerant stream in an auxiliary heat exchanger. The auxiliary heat exchanger is either an economizer heat exchanger or a liquid-suction heat exchanger. In the case of the economizer heat exchanger, the smaller tapped portion of the refrigerant is returned into the intermediate compression stage. In the case of the liquid-suction heat exchanger, the refrigerant leaving the evaporator subcools the refrigerant in the main line as it leaves the condenser. In either case, the refrigerant approaching the evaporator is subcooled and greater cooling capacity is achieved. At the same time, the reheat function is provided by passing a stream of air over the auxiliary heat exchanger. This air additionally cools both refrigerant flows in the auxiliary heat exchanger, which is desirable as it further increases the subcooling of the liquid refrigerant and also reduces the temperature of the vapor refrigerant entering the compressor. This results in improved system efficiency and capacity, while at the same time air is being dehumidified in a reheat cycle.
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