JP2016125746A5

JP2016125746A5 -

Info

Publication number: JP2016125746A5
Application number: JP2014266465A
Authority: JP
Filing date: 2014-12-26
Publication date: 2017-07-20
Anticipated expiration: 2034-12-26

Claims

A plurality of compressors, condensers, first expansion means and evaporators provided in series in the refrigerant circuit;
A gas cooler for cooling the discharged gas refrigerant of each compressor, provided in the refrigerant circulation path connecting the outlet of each compressor and the inlet of the next stage compressor in the plurality of stages of compressors;
A regenerative heat exchanger for exchanging heat between the gas refrigerant from the evaporator toward the compressor and the liquid refrigerant from the condenser toward the first expansion means,
Inversely, including an isothermal heat release process by the condenser, an isothermal heat absorption process by the evaporator, an isobaric heat release process in the liquid region and an isobaric heat absorption process in the superheated steam region performed by heat exchange in the regeneration heat exchanger. While forming the Ericsson cycle,
The partial process performed in the superheated steam region in the isothermal heat dissipation process is replaced with a plurality of adiabatic compression processes by the multistage compressor and a multistage isobaric heat dissipation process by the gas cooler and the condenser. And
The gas side of the regenerative heat exchanger is disposed between the evaporator and the compressor, and the liquid side of the regenerative heat exchanger is disposed between the condenser and the first expansion means,
The temperature of the liquid refrigerant at the outlet of the regeneration heat exchanger on the liquid side becomes the end point of the isobaric heat dissipation process when saturated gas refrigerant is introduced into the regeneration heat exchanger in the isobaric heat absorption process. From the refrigerant temperature Th at the sensible heat limit supercooling point, the wetness limit supercooling point that is the end point of the isobaric heat release process when the end point of the adiabatic expansion process by the first expansion means is located on the saturated refrigerant liquid line A refrigeration or air conditioning apparatus, further comprising a control device for controlling the temperature to reach a temperature between the refrigerant temperature Td .

When the condensation pressure of the refrigerant in the condenser is Pc, the evaporation pressure of the refrigerant in the evaporator is Pe, and the number of stages of the plurality of compressors is n, the plurality of stages of adiabatic compression strokes The compression ratio r between the compressors is (Pc / Pe) ^{1 / n} ,
The said control apparatus cools the discharge gas refrigerant | coolant (condensation temperature + (alpha)) of each step | paragraph to the condensing temperature vicinity in the said multiple steps | paragraphs isobaric heat radiation process by the said gas cooler. The refrigeration or air conditioner described.

A first liquid gas separator provided in the refrigerant circuit between the regenerative heat exchanger and the first expansion means;
A second expansion means provided in the refrigerant circuit on the inlet side of the first liquid gas separator;
An intermediate gas passage for supplying gas refrigerant of the first liquid gas separator to a refrigerant passage connected to an outlet of a low-stage compressor of the plurality of stages of compressors and an inlet of a next-stage compressor; The refrigeration or air conditioning apparatus according to claim 1, further comprising an intermediate cooling apparatus having the intermediate cooling apparatus.

A second liquid gas separator provided in the refrigerant circuit between the regenerative heat exchanger and the first expansion means;
Third expansion means provided in the refrigerant circuit on the inlet side of the second liquid gas separator;
An economizer device having an economizer gas path for supplying a gas refrigerant of the second liquid gas separator to an intermediate pressure region of a low-stage compressor of the plurality of stages of compressors. The refrigeration or air conditioning apparatus according to any one of claims 1 to 3.

The refrigeration or air conditioning apparatus according to any one of claims 1 to 4, wherein the number of stages of the plurality of compressors is two or three.

A plurality of compressors, condensers, first expansion means and evaporators provided in series in the refrigerant circuit;
A gas cooler for cooling the discharged gas refrigerant of each compressor, provided in the refrigerant circulation path connecting the outlet of each compressor and the inlet of the next stage compressor in the plurality of stages of compressors;
A regenerative heat exchanger for exchanging heat between the gas refrigerant from the evaporator toward the compressor and the liquid refrigerant from the condenser toward the first expansion means, and the gas side of the regenerative heat exchanger In the control method of the refrigeration or air conditioner in which the liquid side of the regenerative heat exchanger is disposed between the condenser and the first expansion means between the evaporator and the compressor .
Inverse Ericsson mainly including an isothermal heat release process in the condenser, an isothermal heat absorption process in the evaporator, an isobaric heat release process in the liquid region and an isobaric heat absorption process in the superheated steam region performed by heat exchange in the regenerative heat exchanger Forming a cycle,
The partial process performed in the superheated steam region in the isothermal heat dissipation process is replaced with a plurality of adiabatic compression processes by the multistage compressor and a multistage isobaric heat dissipation process by the gas cooler and the condenser. The first step,
The temperature of the liquid refrigerant at the outlet of the regeneration heat exchanger on the liquid side becomes the end point of the isobaric heat dissipation process when saturated gas refrigerant is introduced into the regeneration heat exchanger in the isobaric heat absorption process. From the refrigerant temperature Th at the sensible heat limit supercooling point, the wetness limit supercooling point that is the end point of the isobaric heat release process when the end point of the adiabatic expansion process by the first expansion means is located on the saturated refrigerant liquid line And a second step of controlling the temperature so as to reach a temperature between the refrigerant temperature Td .

The refrigeration or air conditioning apparatus according to claim 6, wherein the second stroke is performed by at least rotation speed control of a motor that drives the plurality of stages of compressors and control of the first expansion means. Control method.

The second stroke is
A first step of detecting a temperature at the outlet of the regenerative heat exchanger of liquid refrigerant from the condenser toward the first expansion means;
And a second step of controlling the temperature detection value detected in the first step to a temperature between the refrigerant temperature at the sensible heat limit supercooling point and the evaporation temperature of the refrigerant in the evaporator. The control method of the refrigerating or air-conditioning apparatus of Claim 6 or 7.