VAPOR REFRIGERANT INJECTION TECHNIQUES FOR HEAT PUMP SYSTEMS: THE LATEST LITERATURE REVIEW AND DISCUSSION

This paper reviews the latest and major research on vapor refrigerant injection techniques. Various vapor refrigerant injection techniques are discussed and compared. Compared to the basic vapor injection (VI) cycle, double-expansion VI cycle, accumulator-VI cycle and the VI cycle in a cascade system are briefly explained. Studies about these various VI cycles do not only prove the performance of VI cycles, but also show variations of VI cycles. Discussions about the fundamental issues of the VI cycle are also presented.

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