IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0579100
(2004-11-25)
|
등록번호 |
US-7526924
(2009-07-01)
|
우선권정보 |
JP-2003-398271(2003-11-28) |
국제출원번호 |
PCT/JP04/017458
(2004-11-25)
|
§371/§102 date |
20070207
(20070207)
|
국제공개번호 |
WO05/052467
(2005-06-09)
|
발명자
/ 주소 |
- Wakamoto, Shinichi
- Kouda, Toshihide
- Sugihara, Masahiro
- Unezaki, Fumitake
- Kakuta, Masayuki
|
출원인 / 주소 |
- Mitsubishi Denki Kabushiki Kaisha
|
대리인 / 주소 |
Leydig, Voit & Mayer, Ltd.
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
5 |
초록
▼
A refrigerator has a coolant cooler for cooling a coolant at the entrance of a flow control valve when the cooling amount in the coolant cooler is deficient as well as excessive. The refrigerator includes a compressor for compressing the coolant, a radiator for radiating heat from the coolant, a coo
A refrigerator has a coolant cooler for cooling a coolant at the entrance of a flow control valve when the cooling amount in the coolant cooler is deficient as well as excessive. The refrigerator includes a compressor for compressing the coolant, a radiator for radiating heat from the coolant, a coolant cooler for cooling the coolant, a flow control valve for regulating the flow volume of the coolant, an evaporator for evaporating the coolant, and a heat-exchange-amount control for controlling the amount of heat exchanged in the cooler. The coolant is circulated through the compressor, the radiator, the coolant cooler, the flow control valve, and the evaporator, in that sequence.
대표청구항
▼
What is claimed is: 1. A refrigerator comprising: a first compressor for compressing carbon dioxide as a first coolant; a radiator for radiating heat from the first coolant; a first flow control valve for regulating flow volume of the first coolant; a first evaporator for evaporating the first cool
What is claimed is: 1. A refrigerator comprising: a first compressor for compressing carbon dioxide as a first coolant; a radiator for radiating heat from the first coolant; a first flow control valve for regulating flow volume of the first coolant; a first evaporator for evaporating the first coolant; coolant cooling means for cooling the first coolant and including: a second compressor for compressing a second coolant having an energy consumption efficiency higher than that of the first coolant; a condenser for radiating heat from the second coolant; a second flow control valve for regulating flow volume of the second coolant; and a second evaporator for evaporating, with heat from the first coolant, the second coolant; and heat-exchange-amount control means for controlling quantity of heat exchanged in the coolant cooling means, wherein the heat-exchange-amount control means includes: drying-ratio estimation means for estimating, from a value measured using a sensor, a drying ratio between drying rate of the first coolant exiting the first flow control valve and drying rate when the first coolant exiting the radiator is decompressed to its evaporation temperature, drying-ratio control-range determination means for determining a control range of the drying ratio, so that a coefficient of performance (COP) value is obtained, in which the difference between the COP value and the maximum COP value obtained when the drying ratio is varied under predetermined operational conditions is within a predetermined ranges, and control means for controlling the quantity of heat exchanged in the coolant cooling means, so that the drying ratio estimated by the drying-ratio estimation means is within the control range; the first coolant is circulated through the first compressor, the radiator, the coolant cooling means, the first flow control valve, and the first evaporator, in that sequence; and the second coolant is circulated through the second compressor, the condenser, the second flow control valve, and the second evaporator, in that sequence. 2. The refrigerator as claimed in claim 1, wherein the sensor includes: at least one of first pressure-measuring means for measuring pressure of the first coolant between exiting the first flow control valve and entering the first evaporator, and first temperature-measuring means for measuring temperature of the first coolant exiting the first flow control valve; second pressure-measuring means for measuring pressure of the first coolant between the first compressor and the first flow control valve; second temperature-measuring means for measuring temperature of the first coolant entering the first flow control valve; and third temperature-measuring means for measuring temperature of the first coolant exiting the radiator. 3. The refrigerator as claimed in claim 1, wherein the sensor includes: first temperature-measuring means for measuring temperature of the first coolant exiting the first flow control valve; second temperature-measuring means for measuring temperature of the first coolant entering the first flow control valve; third temperature-measuring means for measuring temperature of the first coolant exiting the radiator; fourth temperature-measuring means for measuring temperature of the first coolant entering the radiator; and fifth temperature-measuring means for measuring temperature of the first coolant entering the first compressor. 4. The refrigerator as claimed in claim 1, further comprising at least one of pressure-measuring means for measuring pressure of the first coolant between exiting the first flow control valve and entering the first evaporator, and temperature-measuring means for measuring temperature of the first coolant exiting the first flow control valve, wherein the drying-ratio control-range determination means determines a control range of the drying ratio, using either the pressure of the first coolant measured by the pressure-measuring means or the temperature of the first coolant measured by the temperature-measuring means. 5. The refrigerator as claimed in claim 1, further comprising pressure-measuring means for measuring pressure of the first coolant between exiting the radiator and entering the first flow control valve, wherein the drying-ratio control-range determination means determines a control range of the drying ratio, using the pressure of the first coolant measured by the pressure-measuring means. 6. A refrigerator comprising: a first compressor for compressing carbon dioxide as a first coolant; a radiator for radiating heat from the first coolant; a first flow control valve for regulating flow volume of the first coolant; a first evaporator for evaporating the first coolant; coolant cooling means for cooling the first coolant and including: a second compressor for compressing a second coolant having an energy consumption efficiency higher than that of the first coolant; a condenser for radiating heat from the second coolant; a second flow control valve for regulating flow volume of the second coolant; and a second evaporator for evaporating, with heat from the first coolant, the second coolant; and heat-exchange-amount control means for controlling quantity of heat exchanged in the coolant cooling means, wherein the heat-exchange-amount control means includes: drying-ratio estimation means for estimating, from a value measured using a sensor, a drying ratio between drying rate of the first coolant exiting the first flow control valve and drying rate when the first coolant exiting the radiator is decompressed to its evaporation temperature, drying-ratio control-range determination means for determining a control range of the drying ratio, so that a coefficient of performance (COP) value is obtained, in which the difference between the COP value and the maximum COP value obtained when the drying ratio is varied under predetermined operational conditions is within a predetermined range, and control means for controlling the flow volume of the second coolant flowing in the coolant cooling means, so that the drying ratio estimated by the drying-ratio estimation means is within the control range; the first coolant is circulated through the first compressor, the radiator, the coolant cooling means, the first flow control valve, and the first evaporator, in that sequence; and the second coolant is circulated through the second compressor, the condenser, the second flow control valve, and the second evaporator, in that sequence.
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