This paper compares the compressor efficiency between rotary and scroll type, premising that each type has the highest efficiency mechanism that can be designed at present, in the operation with R22 and its alternative refrigerants, R407C and R410A. The efficiency of compressors optimized for each refrigerants is theoretically figured out, and it is also experimentally confirmed. As the results, the upper limit of cooling capacity range, in which efficiency of rotary type is higher than that of scroll type, is about 8,000 Btu/h with R22 and R407C. In the case with R410A, rotary type is superior to scroll type in the range approximately up to 24,000 Btu/h. This study shows that the range in which rotary type operates more efficiently than scroll type will expand up to small capacity range of unitary air conditioners in the case with R410A.
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