| abstract |
[Problem] To ensure comfortable cabin heating by preventing or suppressing frost formation on an outdoor heat exchanger of an air-conditioning device of so-called heat pump type.n[Solution] A controller calculates, in the absence of frost formation on an outdoor heat exchanger (7), a non-frost forming requested refrigerant evaporation temperature (TXObaseQtgt), which is a refrigerant evaporation temperature of the outdoor heat exchanger (7) when a requested heating capacity (Qtgt), which is a requested heating capacity from the radiator (4), is realized, and controls heating by the radiator (4) and heating by a heat medium-air heat exchanger (40) of a heat medium circulating circuit (23) on the basis of the non-frost forming requested refrigerant evaporation temperature (TXObaseQtgt) and a frost point (Tfrost), so that the requested heating capacity (Qtgt) can be achieved without causing frost formation on the outdoor heat exchanger (7). |