The refrigeration and heating performance of an air conditioner were tested by changing the outdoor environment temperature and relative humidity. The relative refrigerating capacity percentage (RRCP)

relative heating capacity percentage (RHCP)

relative power percentage (RPP)

and relative energy consumption percentage (RECP) are introduced to establish the relationship between the measured performance and rated parameters. The results show that the variation in outdoor relative humidity has little effect on the performance of the air conditioner. However

under the cooling conditions

the outdoor dry-bulb temperature increased from 24 to 43 ℃

RRCP decreased from 16.5% to ﹣13.2%

RPP increased from ﹣4.8% to 24%

and RECP decreased from 22.2% to ﹣30%. When the outdoor dry-bulb temperature is lower than the corresponding temperature of rated case

RECP exhibits a positive deviation

and the performance of air conditioner is excellent. When the outdoor dry-bulb temperature is higher than the corresponding temperature of rated case

RECP exhibits a negative deviation

and the performance of the air conditioner is bad

indicating wasted energy. Under the heating condition

when the outdoor dry-bulb temperature increased from ﹣6 to 16 ℃

RHCP increased from ﹣34% to 14%

RRP increased from ﹣24% to ﹣2%

and RECP increased from ﹣13% to 16.9%. When the outdoor dry-bulb temperature is lower than the corresponding temperature of rated case

RECP exhibits a negative deviation

and the performance of the air conditioner is poor; when the dry-bulb outdoor temperature is higher than the corresponding temperature of rated case

RECP exhibits a positive deviation

and the performance of the air conditioner is excellent

which is conducive to saving energy.