Abstract: In order to compare the influences of exhaust through the bypass channel and the main channel on the energy efficiency of the air conditioning system and the suction temperature, a single variable method was used to verify the performance under different conditions and different frequencies. The results showed that capacity increased 3%-4% and energy efficiency increased 2.6%-3.6% at low temperature for cooling. Capacity increased 4.6% and energy efficiency increased 6% in low temperature and low frequency for heating. Capacity increased 18.6% and energy efficiency increased 11.3% in high frequency for heating. Capacity increased 28.3% and energy efficiency increased 14.8% at rated heating conditions. The effect of energy saving was very obvious .

Key words: Air conditioning system, Exhaust bypass, Main channel, Suction tube, Capacity and energy efficiency, Energy saving