| 摘要 |
<p>Provided is a heat pump type air conditioner capable of improving the estimation accuracy of supercooling by improving the reliance of the refrigerant used in estimation of supercooling. The present invention provides a heat pump type air conditioner comprising an external heat exchanger (1); multiple indoor units (2, 3); a first fluid path (91) combining the ejection ports in heating of multiple indoor heat exchanger (21, 31) and connecting the joint portion and an air suction port in heating the external heat exchanger (1); and a refrigerant circuit (A) having compressors (51, 52). The heat pump type air conditioner has a temperature estimation unit (102) estimating the temperature of the refrigerant after joining in the first fluid path (91) when heating, based on the value corresponding to the maximum flux of the refrigerant of indoor expansion valves (23, 33) and the openness of the indoor expansion valves (23, 33) as a result of detecting temperature sensors (24, 34) of indoor fluid pipes; and a supercooling estimation unit (103) calculating the supercooling of the refrigerant circuit (A) by using the estimated temperature estimated in the temperature estimation unit (102). [Reference numerals] (AA) Air heating;(BB) Air cooling</p> |
