IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0362756
(2001-08-31)
|
우선권정보 |
NO-20004369 (2000-09-01); NO-20005575 (2000-11-03) |
국제출원번호 |
PCT//NO01/00354
(2003-07-21)
|
§371/§102 date |
20030721
(20030721)
|
국제공개번호 |
WO02//18854
(2002-03-07)
|
발명자
/ 주소 |
- Aflekt, K?re
- Brendeng, Einar
- Hafner, Armin
- Neks?, Petter
- Pettersen, Jostein
- Rekstad, H?vard
- Skaugen, Geir
- Zakeri, Gholam Reza
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
6 |
초록
▼
A method of defrosting of a heat exchanger (evaporator) in a vapor compression system including, downstream of a heat exchanger (evaporator) (3) to be defrosted, at least a compressor (1), a second heat exchanger (condenser/heat rejecter) (2), and an expansion device (6) connected by conduits in an
A method of defrosting of a heat exchanger (evaporator) in a vapor compression system including, downstream of a heat exchanger (evaporator) (3) to be defrosted, at least a compressor (1), a second heat exchanger (condenser/heat rejecter) (2), and an expansion device (6) connected by conduits in an operable manner to form an integral closed circuit. The heat exchanger (3) to be defrosted is subjected to essentially the same pressure as the compressor's (1) discharge pressure. Thus, the heat exchanger (3) is defrosted as the high-pressure discharge gas from the compressor (1) flows through to the heat exchanger, giving off heat to the heat exchanger (3). In the circuit, in connection with the expansion device (6) a first bypass loop 23 with a first valve (16′), is provided. A pressure reducing device (6′) is provided in a second bypass loop in conjunction with a second valve (16′″) disposed downstream of the heat exchanger (3) being defrosted, whereby the first valve (16′) is open and the second valve (16′″) is closed when defrosting takes place.
대표청구항
▼
1. A method of defrosting a first heat exchanger in a vapor compression system, comprising:arranging the first heat exchanger to be defrosted, a compressor, a second heat exchanger, and an expansion device so as to be interconnected by conduits to form an integral closed circuit; and aligning the fi
1. A method of defrosting a first heat exchanger in a vapor compression system, comprising:arranging the first heat exchanger to be defrosted, a compressor, a second heat exchanger, and an expansion device so as to be interconnected by conduits to form an integral closed circuit; and aligning the first heat exchanger, the compressor, the second heat exchanger, and the expansion device within the integral closed circuit in such a manner that, during a defrosting cycle of the first heat exchanger, refrigerant in gas form flows through the first heat exchanger at a pressure substantially identical to a pressure of refrigerant gas discharged from the compressor so that the refrigerant in gas form flowing through the first heat exchanger gives off heat to the first heat exchanger to thereby defrost the first heat exchanger. 2. The method of claim 1, further comprising adding heat to the refrigerant in the integral closed circuit using a heating device located at a point along a path of the refrigerant flowing through the integral closed circuit.3. The method of claim 2, wherein said adding of heat comprises using a heating device located in a pressure receiver.4. The method of claim 1, further comprising heating the refrigerant during the defrosting cycle using at least one of compression heat from the compressor and heat from a compressor motor.5. The method of claim 1, further comprising heating the refrigerant during the defrosting cycle using at least one of heat accumulated in the second heat exchanger, a storage tank, and another part of the integral closed circuit.6. The method of claim 1, wherein said aligning comprises, during the defrosting cycle of the first heat exchanger, coupling the first heat exchanger and the second heat exchanger in series, supplying the refrigerant gas from the compressor through the second heat exchanger to allow the refrigerant gas to give off some heat, and then supplying the cooled refrigerant gas from the second heat exchanger through the first heat exchanger to defrost the first heat exchanger.7. The method of claim 1, wherein said aligning comprises, during the defrosting cycle of the first heat exchanger, coupling the first heat exchanger and the second heat exchanger in parallel, and simultaneously supplying the refrigerant gas from the compressor through the first heat exchanger and the second heat exchanger to allow the refrigerant gas to simultaneously give off some heat through both the first heat exchanger and the second heat exchanger.8. The method of claim 1, wherein said aligning comprises aligning the first heat exchanger, the compressor, the second heat exchanger, and the expansion device so that a refrigeration cycle or heat pump cycle is trans-critical.9. The method of claim 1, wherein the refrigerant is carbon dioxide.10. The method of claim 1, wherein said aligning comprises aligning the first heat exchanger, the compressor, the second heat exchanger, and the expansion device so that the defrosting cycle is trans-critical.11. The method of claim 1, further comprising actively controlling the pressure of the refrigerant gas discharged from the compressor so as to adjust the temperature and specific enthalpy of the refrigerant gas at the outlet of the compressor during the defrosting cycle.12. The method of claim 1, wherein said arranging further includes arranging a pressure receiver in the integral closed circuit, and said aligning comprises aligning the pressure receiver so that the refrigerant flows through the pressure receiver.13. A defrosting system for defrosting a first heat exchanger in a vapor compression system, comprising:said first heat exchanger to be defrosted; a compressor for discharging refrigerant gas; a second heat exchanger; an expansion device; a first bypass loop having a first valve, said first bypass loop being arranged to bypass said expansion device; and a second bypass loop having a pressure reducing device, said second bypass loop being arranged downstream of said first heat exchanger and being arranged to bypass a second valve downstream of said first heat exchanger, wherein said first heat exchanger, said compressor, said second heat exchanger, said expansion device, said first bypass loop, and said second bypass loop are interconnected by conduits so as to form an integral closed circuit, and wherein said first bypass loop and said second bypass loop are arranged to have refrigerant flowing therethrough during a defrosting cycle of said first heat exchanger. 14. The defrosting system of claim 13, wherein said first bypass loop connects an outlet of said compressor to an inlet of said first heat exchanger to be defrosted.15. The defrosting system of claim 13, further comprising a pressure receiver in said integral closed circuit.16. The defrosting system of claim 13, wherein said first heat exchanger and said second heat exchanger are coupled in series.17. The defrosting system of claim 13, wherein said first heat exchanger and said second heat exchanger are coupled in parallel.18. The defrosting system of claim 17, further comprising a 3-way valve downstream of said compressor so as to allow at least a portion of the refrigerant gas discharged by said compressor to be directed to said first heat exchanger via said first bypass loop.19. The defrosting system of claim 13, wherein said first bypass loop is arranged to bypass at least a portion of said second heat exchanger.20. The defrosting system of claim 13, further comprising a third internal heat exchanger in said integral closed circuit, said first bypass loop being arranged to bypass said third internal heat exchanger.
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