REFRIGERANT SYSTEM WITH VAPOR INJECTION AND LIQUID INJECTION THROUGH SEPARATE PASSAGES

摘要

A refrigerant system is provided with economizer vapor injection and liquid injection functions. As is known, the economizer function enhances performance of the refrigerant system. The liquid injection lowers the discharge temperature of the refrigerant to provide reliable compressor/system operation. The liquid injection and economizer vapor injection functions are selectively provided through distinct fluid passages leading to separate compression pockets. Single or dual pocket injection scheme could be utilized in conjunction with either function. The location of the liquid injection is preferably downstream in the compression process in relation to the economizer vapor injection. In this manner, a refrigerant system designer can select the optimal location of injection for each of the two refrigerant flows. The refrigerant system can consists of a single compressor or multiple compressors either connected in series or in parallel.