Vapor compression refrigerant cycle
AssigneeDenso Corporation
InventorHiromi Ohta
Life of this patent
Estimating the term…
Abstract
In a vapor compression refrigerant cycle using refrigerant having a critical temperature equal to or less than sixty degrees Celsius, when refrigerant temperature detected by a sensor as a parameter of a low-pressure side refrigerant pressure is higher than a saturation temperature corresponding to a predetermined pressure that is equal to or less than a critical pressure, a volume of air passing through an evaporator is controlled smaller than a predetermined volume by controlling operation of a blower unit. Because heat exchange rate (heat absorbing rate) in the evaporator is controlled, the pressure of the low-pressure side refrigerant is maintained below the critical pressure. Alternatively, the heat exchange rate is controlled by reducing a flow rate of the refrigerant in the evaporator.
Claims14
A vapor compression refrigerant cycle for transferring heat from low-temperature refrigerant to high-temperature refrigerant, the cycle comprising:
- a compressor for compressing refrigerant;
- a first heat exchanger for cooling high-pressure refrigerant compressed in the compressor;
- and
- a second heat exchanger for vaporizing low-pressure refrigerant after being decompressed,
- wherein the refrigerant has a critical temperature equal to or lower than sixty degrees Celsius,
- wherein a pressure of the refrigerant in the second heat exchanger is controlled equal to or lower than a critical pressure of the refrigerant.
A vapor compression refrigerant cycle for transferring heat from low-temperature refrigerant to high-temperature refrigerant, the cycle comprising:
- a compressor for compressing refrigerant;
- a first heat exchanger for cooling high-pressure refrigerant compressed in the compressor;
- and
- a second heat exchanger for vaporizing low-pressure refrigerant after being decompressed, wherein
- the refrigerant has a critical temperature equal to or lower than sixty degrees Celsius,
- a pressure of the refrigerant in the second heat exchanger is controlled equal to or lower than a predetermined pressure;
- and
- the pressure of the refrigerant in the second heat exchanger is controlled equal to or lower than a pressure that a product of latent heat of vaporization of the refrigerant and density of gas refrigerant is on a maximum level.
A vapor compression refrigerant cycle comprising:
- a compressor compressing refrigerant;
- a radiator for cooling high-temperature and high-pressure refrigerant compressed in the compressor;
- a low-pressure side heat exchanger for vaporizing low-pressure and low-temperature refrigerant;
- an ejector including a nozzle for decompressing and expanding the refrigerant discharged from the radiator by converting pressure energy of the refrigerant to velocity energy, and a pressure increasing portion for increasing pressure of the refrigerant by converting the velocity energy to the pressure energy while mixing the refrigerant jetted from the nozzle and the refrigerant sucked from the low-pressure side heat exchanger;
- a gas-liquid separator for separating the refrigerant discharged from the ejector into gas refrigerant and liquid refrigerant, supplying the gas refrigerant to an inlet of the compressor and supplying the liquid refrigerant to the low-pressure side heat exchanger;
- and
- a valve provided on a refrigerant passage connecting the ejector and the gas-liquid separator,
- wherein the valve is closed when a pressure of the refrigerant in the low-pressure side heat exchanger is higher than a predetermined pressure that is equal to or lower than a critical pressure.
Dependencies are inferred from the claim text.