JP-WO2025177330-A5 -

Dates

Publication Date

20260508

Application Date

20240219

Description

Furthermore, one aspect of the present disclosure is an air conditioner comprising an indoor unit having at least the indoor heat exchanger and an outdoor unit having at least the compressor and the outdoor heat exchanger, wherein the air conditioner has a refrigerant circuit in which a refrigerant is circulated, and the indoor unit has at least the indoor heat exchanger and the outdoor unit has at least the compressor and the outdoor heat exchanger, wherein the air conditioner comprises a discharge pressure sensor for detecting the discharge pressure which is the pressure of the refrigerant discharged from the compressor, a discharge temperature sensor for detecting the discharge temperature which is the temperature of the refrigerant discharged from the compressor, a space temperature sensor for detecting the air temperature in the space in which the heat exchanger, which functions as a condenser, is installed, and a control unit that performs a start-up control process to control the rotation speed of the compressor so that the discharge pressure becomes a target discharge pressure which is the pressure that makes the air temperature detected by the space temperature sensor the saturation temperature, for a period of time after the compressor has been started, until the discharge superheat, which is the value obtained by subtracting the saturation temperature of the discharge pressure calculated based on the discharge pressure detected by the discharge pressure sensor from the discharge temperature detected by the discharge temperature sensor, becomes equal to or greater than a preset threshold. Furthermore, one aspect of the present disclosure is an air conditioner having a refrigerant circuit in which a refrigerant circulates, with a compressor whose rotational speed can be changed, an expansion valve, and a heat exchanger including an outdoor heat exchanger and an indoor heat exchanger connected by refrigerant piping, and comprising an indoor unit having at least the indoor heat exchanger, an outdoor unit having at least the compressor and the outdoor heat exchanger, a discharge pressure sensor for detecting the discharge pressure which is the pressure of the refrigerant discharged from the compressor, a discharge temperature sensor for detecting the discharge temperature which is the temperature of the refrigerant discharged from the compressor, and a space temperature sensor for detecting the air temperature in the space in which the heat exchanger, which functions as a condenser, is installed, wherein the control unit performs a start control process to control the rotational speed of the compressor after starting the compressor, for a period of time until the discharge superheat, which is the value obtained by subtracting the saturation temperature of the discharge pressure calculated based on the discharge pressure detected by the discharge pressure sensor from the discharge temperature detected by the discharge temperature sensor, becomes equal to or greater than a preset threshold, so that the discharge pressure becomes a target discharge pressure which is the pressure that makes the air temperature detected by the space temperature sensor the saturation temperature. The outdoor unit ambient temperature sensor 33 detects the ambient temperature Tm2 (an example of air temperature Tm), which is the ambient temperature of the air surrounding the outdoor unit 10. The outdoor unit ambient temperature sensor 33 detects, for example, the air temperature at the air intake of the outdoor unit 10. The outdoor unit ambient temperature sensor 33 outputs the detected ambient temperature Tm2 to the outdoor unit control unit 30. The outdoor unit ambient temperature sensor 33 is an example of a spatial temperature sensor that detects the ambient temperature Tm (Tm2) in the space where the heat exchanger (outdoor heat exchanger 13), which functions as a condenser, is installed during cooling operation. In this embodiment, the outdoor unit control unit 30 (an example of a control unit) starts the compressor 11 and, during the period until the discharge superheat (Shd) reaches a preset threshold Tth1 or higher (for example, 3 degrees or higher), it performs a start-up control process to control the rotation speed of the compressor 11 so that the discharge pressure Pd becomes a target discharge pressure Pdm1, which is the pressure at which the saturation temperature is a preset set temperature (air temperature Tm). The discharge superheat is the same as in the first embodiment, obtained by subtracting the saturation temperature Th of the discharge pressure Pd, which is calculated based on the discharge pressure Pd detected by the discharge pressure sensor 32, from the discharge temperature Td detected by the discharge temperature sensor 31 (Shd = Td - Th). In this embodiment, the outdoor unit control unit 30 (an example of a control unit) starts the compressor 11 and, during the period until the discharge superhea