# US 8,539,791 B2 · Manufacturing method of transition critical refrigerating cycle device

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- Number: US 8,539,791 B2
- Document ID: US8539791B2
- Status: Granted
- Kind: B2
- Application number: 11/727,708
- Filed: 2007-03-28
- Published: 2007-10-04
- Granted: 2013-09-24
- Earliest claimed: 2006-03-28
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: Satoshi Hariu; Jun Sato; Hiroshi Tamayama
- Inventors: Satoshi Hariu; Jun Sato; Hiroshi Tamayama
- Web page: https://patentgrep.com/patent/US8539791B2

## CPC

- F25B 9/008: {the refrigerant being carbon dioxide}
- F25B 1/10: with multi-stage compression (with cascade operation F25B7/00)
- F28D 1/0426: {with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element}
- F28D 1/0477: {the conduits being bent in a serpentine or zig-zag}
- F25B 40/00: Subcoolers, desuperheaters or superheaters
- F25B 2309/061: with cycle highest pressure above the supercritical pressure
- F25B 2500/01: Geometry problems, e.g. for reducing size
- F25B 2500/18: Optimization, e.g. high integration of refrigeration components
- F25D 23/003: {for cooling refrigerating machinery}
- F28D 2021/0073: {Gas coolers}
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B)

## Abstract

A manufacturing method of a transition critical refrigerating cycle device in which a gas cooler and a sub-cooler are integrated to constitute one heat exchanger so as to most efficiently cool a refrigerant in the device. The transition critical refrigerating cycle device is constituted by successively connecting a compressor, the gas cooler, a capillary tube and an evaporator, and having a supercritical pressure on a high-pressure side of the device. The sub-cooler cools an intermediate-pressure refrigerant of the device. A ratio of the number of refrigerant pipes of the sub-cooler to the number of refrigerant pipes of the whole heat exchanger is set to 20% or more and 30% or less. The refrigerant pipes of the sub-cooler have a uniform heat transfer area per unit length of each refrigerant pipe.

## Claims

### Claim 1

A manufacturing method of a transition critical refrigerating cycle device constituted by successively connecting a compressor, a gas cooler, a throttling device and an evaporator and having a supercritical pressure on a high-pressure side of the device, the method comprising:
providing the gas cooler which cools a high-pressure refrigerant of the compressor by the flow of a refrigerant through refrigerant pipes of the gas cooler and the flow of air as the heat absorber over the refrigerant pipes of the gas cooler;
providing a sub-cooler which cools an intermediate-pressure refrigerant of the compressor by the flow of the refrigerant through refrigerant pipes of the sub-cooler and the flow of air as the heat absorber over the refrigerant pipes of the sub-cooler, wherein the refrigerant pipes of the sub-cooler have a uniform heat transfer area per unit length of each refrigerant pipe;
integrating the gas cooler and the sub-cooler to constitute a heat exchanger;
setting a ratio of the number of refrigerant pipes of the sub-cooler to the number of refrigerant pipes of the whole heat exchanger to 20% or more and 30% or less;
positioning the gas cooler on the air inflow side of the heat exchanger and positioning the sub-cooler on the air outflow side of the heat exchanger;
arranging the refrigerant pipes of the sub-cooler in parallel with one another in a vertical direction on a refrigerant inlet side; and
arranging the refrigerant pipes of the sub-cooler obliquely in relation to a vertical direction on a refrigerant downstream side, whereby
the refrigerant pipes on the refrigerant inlet side of the sub-cooler are less densely arranged than the refrigerant pipes on the refrigerant downstream side of the sub-cooler.

### Claim 2 (depends on 1)

The manufacturing method of the transition critical refrigerating cycle device according to claim 1, wherein the ratio of the number of the refrigerant pipes of the sub-cooler to the number of the refrigerant pipes of the whole heat exchanger is set to 23% or more and 28% or less.

### Claim 3 (depends on 2)

The manufacturing method of the transition critical refrigerating cycle device according to claim 2, wherein carbon dioxide is used as the refrigerant.

### Claim 4 (depends on 2)

The manufacturing method of the transition critical refrigerating cycle device according to claim 2, wherein the compressor includes low-stage compression means and high-stage compression means;
the refrigerant discharged from the low-stage compression means enters the sub-cooler;
the refrigerant cooled by the sub-cooler is sucked into the high-stage compression means; and
the refrigerant discharged from the high-stage compression means enters the gas cooler.

### Claim 5 (depends on 4)

The manufacturing method of the transition critical refrigerating cycle device according to claim 4, wherein carbon dioxide is used as the refrigerant.

### Claim 6 (depends on 1)

The manufacturing method of the transition critical refrigerating cycle device according to claim 1, wherein the compressor includes low-stage compression means and high-stage compression means;
the refrigerant discharged from the low-stage compression means enters the sub-cooler;
the refrigerant cooled by the sub-cooler is sucked into the high-stage compression means; and
the refrigerant discharged from the high-stage compression means enters the gas cooler.

### Claim 7 (depends on 6)

The manufacturing method of the transition critical refrigerating cycle device according to claim 6, wherein carbon dioxide is used as the refrigerant.

### Claim 8 (depends on 1)

The manufacturing method of the transition critical refrigerating cycle device according to claim 1, wherein carbon dioxide is used as the refrigerant.