Improvement of compressor efficiency using the alternative refrigerant is demanded strongly to reduce CO{sub}2 emission, which causes the global warming. Especially the compressor using in frozen temperature level has long lifetime, and the correspondence to above-mentioned is one of the most important subjects. The scroll compressor is the promising structure to solve this problem. A technical point is the controlling mechanism of the discharge gas temperature. In HCFC-22 scroll compressor, the injection system of the liquid refrigerant to the compression chambers is put in practical use. The numerical calculation program for the performance simulation using the alternative refrigerant was created to develop the new scroll compressor with the liquid injection system. By using this simulation, the development period can be shortened in the conventional half.
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