Air-conditioning apparatus with multiple operational modes

摘要

An air-conditioning apparatus has a heating only temporary operation mode in which, in changing from a heating main operation mode to a heating only operation mode, when an outside air temperature is at or above a predetermined temperature, at least one of heat exchangers functioning as a condenser in the heating main operation mode continues functioning as the condenser, and the refrigerant is not supplied to the intermediate heat exchanger functioning as an evaporator in the heating main operation mode and a cooling only temporary operation mode in which, in changing from a cooling main operation mode to a cooling only operation mode, when the outside air temperature is at or below a predetermined temperature, at least one of heat exchangers functioning as the evaporator in the cooling main operation mode continues functioning as the evaporator, and the refrigerant is not supplied to the intermediate heat exchanger functioning as the condenser in the cooling main operation mode.

主权项

1. An air-conditioning apparatus comprising:
an outdoor unit including a compressor, a first refrigerant flow switching device, and a heat source side heat exchanger; a relay unit including a plurality of intermediate heat exchangers, a plurality of expansion devices, and a plurality of second refrigerant flow switching devices; and at least one indoor unit including a use side heat exchanger, wherein the compressor, the first refrigerant flow switching device, the expansion devices, the second refrigerant flow switching devices, and the intermediate heat exchangers are connected by a refrigerant pipe to form a refrigeration cycle through which a refrigerant circulates, the intermediate heat exchangers and the use side heat exchanger are connected by a heat medium pipe to form a heat medium circulation circuit through which a heat medium different from the refrigerant circulates, the air-conditioning apparatus switches the second refrigerant flow switching devices corresponding to the intermediate heat exchangers and causes each of the intermediate heat exchangers to function as a condenser or an evaporator, and the air-conditioning apparatus has
a heating only operation mode in which all the intermediate heat exchangers function as condensers,a heating main operation mode in which at least one of the intermediate heat exchangers functions as the condenser, at least one thereof functions as the evaporator, and a heating load is larger than a cooling load,a heating only temporary operation mode in which, in changing from the heating main operation mode to the heating only operation mode, when an outside air temperature is at or above a predetermined temperature, at least one of the intermediate heat exchangers functioning as the condenser in the heating main operation mode continues functioning as the condenser, and the refrigerant is not supplied to the intermediate heat exchanger functioning as the evaporator in the heating main operation mode,a cooling only operation mode in which all the intermediate heat exchangers function as evaporators,a cooling main operation mode in which at least one of the intermediate heat exchangers functions as evaporator, at least one thereof functions as the condenser, and the cooling load is larger than the heating load,a cooling only temporary operation mode in which, in changing from the cooling main operation mode to the cooling only operation mode, when the outside air temperature is at or below a predetermined temperature, at least one of the intermediate heat exchangers functioning as the evaporator in the cooling main operation mode continues functioning as the evaporator, and the refrigerant is not supplied to the intermediate heat exchanger functioning as the condenser in the cooling main operation mode, the air conditioning apparatus further comprising an operation mode controller that detects whether an operation mode is the heating only operation mode, the heating main operation mode, the cooling only operation mode, and the cooling main operation mode on the basis of an operation of the indoor unit and an air conditioning load of the indoor unit, wherein in changing from the heating main operation mode to the heating only operation mode, when the operation mode controller detects that the operation mode is the heating only operation mode, the operation mode controller changes the operation mode set in the operation mode controller from the heating main operation mode to the heating only temporary operation mode, and in changing from the cooling main operation mode to the cooling only operation mode, when the operation mode controller detects that the operation mode is the cooling only operation mode, the operation mode controller changes the operation mode set in the operation mode controller from the cooling main operation mode to the cooling only temporary operation mode.