Abstract: In the new energy efficiency national standard of room air conditioner, APF index will be used to evaluate the energy efficiency of single speed air conditioner. Degradation coefficient CD is a critical parameter to calculate APF, so it is necessary to study it deeply. This paper introduces the determination method of CD, through relevant experimental research, the method of optimizing CD is discussed. Suggestions are put forward to improve the test accuracy of CD, which will help enterprises to develop efficient single speed air conditioner.

Key words: Room air conditioner, Single-speed air conditioner, APF, CD