AIR CONDITIONER

To enable operation at the most efficient state to be performed with R1234yf noted for a small warming coefficient, which cannot be performed by conventional controls.SOLUTION: An air conditioner 100 uses a refrigerant including R1234yf and comprises: a compressor 1; a condenser 2; throttle means 3; an evaporator 4; an internal heat exchanger 5; condenser side inlet temperature detection means 6; evaporator side outlet temperature detection means 7; control means 8; first blowing means 9; and second blowing means 10. The condenser side inlet temperature detection means 6 detects a refrigerant temperature at a condenser side inlet of the internal heat exchanger 5, the evaporator side outlet temperature detection means 7 detects a refrigerant temperature at an evaporator side outlet of the internal heat exchanger 5, and each transmit the respective temperature information to the control means 8. The control means 8 adjusts opening of the throttle means 3 on the basis of the refrigerant temperatures detected by the condenser side inlet temperature detection means 6 and the evaporator side outlet temperature detection means 7.SELECTED DRAWING: Figure 1 【課題】温暖化係数の小さいことで注目されているＲ１２３４ｙｆでは、従来の制御では、最も効率の良いところで運転できないという課題がある。【解決手段】空気調和機１００は、Ｒ１２３４ｙｆを含む冷媒を使用し、圧縮機１と、凝縮器２と、絞り手段３と、蒸発器４と、内部熱交換器５と、凝縮器側入口温度検知手段６と、蒸発器側出口温度検知手段７と、制御手段８と、第一の送風手段９と、第二の送風手段１０と、を備える。 凝縮器側入口温度検知手段６は、内部熱交換器５の凝縮器側入口の冷媒温度を検知し、蒸発器側出口温度検知手段７は、内部熱交換器５の蒸発器側出口の冷媒温度を検知し、それぞれ制御手段８へ温度情報を伝える。制御手段８は、凝縮器側入口温度検知手段６と蒸発器側出口温度検知手段７が検知した冷媒温度に基づいて絞り手段３の開度を調整する。【選択図】 図１