JPWO2023105607A5

JPWO2023105607A5 -

Info

Publication number: JPWO2023105607A5
Application number: JP2022523635A
Authority: JP
Filing date: 2021-12-07
Publication date: 2023-11-09

Description

上記の目的を達成するため、本開示に係る空気調和機は、冷媒回路と、温度センサと、コントローラとを備える。冷媒回路は、冷媒を圧縮する圧縮機、冷媒と外気を熱交換させる室外熱交換器、冷媒を減圧して膨張させる膨張装置および、冷媒と室内空気を熱交換させる室内熱交換器が、圧縮機、室外熱交換器、膨張装置、室内熱交換器の順序で接続されている。また、温度センサは、外気温度を測定する。さらに、コントローラは、冷媒の臨界温度未満の第一温度領域と冷媒の臨界温度以上の第二温度領域とを含む複数の温度領域と、温度領域それぞれで膨張装置が冷媒を膨張させる膨張の程度とが対応付けられた関数に、温度センサが測定した外気温度の値をあてはめて、外気温度に対応する冷媒の膨張の程度を決め、決めた膨張の程度に冷媒が膨張する状態に膨張装置を駆動する。そして、複数の温度領域のうち、第二温度領域を含む、冷媒の臨界温度以上の超臨界温度範囲にある温度領域の数は、第一温度領域を含む、冷媒の臨界温度未満の亜臨界温度範囲にある温度領域の数よりも多い。 In order to achieve the above object, an air conditioner according to the present disclosure includes a refrigerant circuit, a temperature sensor, and a controller. The refrigerant circuit consists of a compressor that compresses the refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outside air, an expansion device that decompresses and expands the refrigerant, and an indoor heat exchanger that exchanges heat between the refrigerant and indoor air. , outdoor heat exchanger, expansion device, and indoor heat exchanger are connected in this order. Further, the temperature sensor measures the outside temperature. Further, the controller has a plurality of temperature ranges including a first temperature range below the critical temperature of the refrigerant and a second temperature range above the critical temperature of the refrigerant, and a degree of expansion in which the expansion device expands the refrigerant in each temperature range. The value of the outside air temperature measured by the temperature sensor is applied to the function associated with , the degree of expansion of the refrigerant corresponding to the outside air temperature is determined, and the expansion device is driven to a state where the refrigerant expands to the determined degree of expansion. do. Among the plurality of temperature regions, the number of temperature regions in the supercritical temperature range above the critical temperature of the refrigerant, including the second temperature region, is the subcritical temperature range below the critical temperature of the refrigerant, including the first temperature region. more than the number of temperature regions in the range.

Claims

The compressor includes a compressor that compresses a refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outside air, an expansion device that decompresses and expands the refrigerant, and an indoor heat exchanger that exchanges heat between the refrigerant and indoor air. , a refrigerant circuit connected in the order of the outdoor heat exchanger, the expansion device, and the indoor heat exchanger;
A temperature sensor that measures outside temperature;
a plurality of temperature regions including a first temperature region below the critical temperature of the refrigerant and a second temperature region above the critical temperature of the refrigerant; and a degree of expansion in which the expansion device expands the refrigerant in each of the temperature regions; A state in which the value of the outside air temperature measured by the temperature sensor is applied to the function to which the temperature sensor is associated to determine the degree of expansion of the refrigerant corresponding to the outside air temperature, and the refrigerant expands to the determined degree of expansion. a controller that drives the expansion device;
Equipped with
Among the plurality of temperature regions, the number of temperature regions in the supercritical temperature range above the critical temperature of the refrigerant, including the second temperature region, is in the supercritical temperature range below the critical temperature of the refrigerant, including the first temperature region. The air conditioner has more temperature regions than the subcritical temperature range .

The function is defined by a table in which the plurality of temperature regions and the degree of expansion of the refrigerant in each of the temperature regions are associated,
The controller determines which of the plurality of temperature ranges the outside air temperature measured by the temperature sensor belongs to, and determines the degree of expansion of the refrigerant corresponding to the temperature range determined to belong based on the table. decide,
The air conditioner according to claim 1.

The expansion device is connected to a first capillary tube in parallel with the first capillary tube and in series with a solenoid valve, and the flow rate of the refrigerant flowing therein is adjusted by the opening degree of the solenoid valve. a capillary tube circuit including a second capillary tube;
The controller expands the refrigerant flowing out of the capillary tube circuit to the degree of expansion determined by itself by changing the opening degree of the solenoid valve.
The air conditioner according to claim 1 or 2 .

the refrigerant is carbon dioxide;
The air conditioner according to any one of claims 1 to 3 .

The refrigerant circuit is installed in a railway vehicle, and the indoor heat exchanger exchanges heat between the refrigerant and indoor air of the railway vehicle.
The air conditioner according to any one of claims 1 to 4 .

The compressor includes a compressor that compresses a refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outside air, an expansion device that decompresses and expands the refrigerant, and an indoor heat exchanger that exchanges heat between the refrigerant and indoor air. , a refrigerant circuit connected in the order of the outdoor heat exchanger, the expansion device, and the indoor heat exchanger;
A temperature sensor that measures outside temperature;
A method for controlling an air conditioner, comprising:
a plurality of temperature regions including a first temperature region below the critical temperature of the refrigerant and a second temperature region above the critical temperature of the refrigerant; and a degree of expansion in which the expansion device expands the refrigerant in each of the temperature regions; applying the value of the outside air temperature measured by the temperature sensor to the function associated with the temperature sensor to determine the degree of expansion of the refrigerant corresponding to the outside air temperature;
driving the expansion device to a state where the refrigerant expands to the degree of expansion determined in the step of determining the degree of expansion of the refrigerant;
Equipped with
Among the plurality of temperature regions, the number of temperature regions in the supercritical temperature range above the critical temperature of the refrigerant, including the second temperature region, is in the supercritical temperature range below the critical temperature of the refrigerant, including the first temperature region. A method of controlling an air conditioner that has more temperature regions than subcritical temperature ranges .