Patent ID: 9714795
Date: 2017-07-25
CPC Classifications: B21D,F24F,F25B,F28F

Claim:
1. An air conditioner comprising: an indoor machine equipped with an indoor heat exchanger constituted by a plurality of heat transfer tubes which pierce a plurality of fins, the plurality of heat transfer tubes having spiral grooves whose lead angle is 35 to 45 degrees formed on faces inside the tubes, and an outdoor machine equipped with an outdoor heat exchanger constituted by a plurality of heat transfer tubes which pierce a plurality of fins, the plurality of heat transfer tubes having spiral grooves, formed on faces inside the tubes, whose lead angle is smaller than the lead angle of the plurality of heat transfer tubes in the indoor heat exchanger, wherein the indoor heat exchanger functions as both an evaporator and a condenser, and the outdoor heat exchanger functions as both of an evaporator and a condenser, and wherein the lead angle of the spiral grooves formed in the plurality of heat transfer tubes in the outdoor heat exchanger is 25 to 35 degrees.