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US 7,743,621 B2Granted
Multi-range composite-evaporator type cross-defrosting system
OwnerLung-Tan Huinventor
Life of this patent
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Abstract
The present invention provides a multi-range composite-evaporator type cross-defrosting system for continuous heating operation under an environment temperature range from 20 degree to negative 40 degree Celsius. Said system employs a combination of two defrosting methods under different temperature and humidity conditions; the first defrosting method is used for the outdoor temperature range of 20 degree Celsius to 0 degree Celsius, the second defrosting method is used in the outdoor temperature range of 10 degree Celsius to negative 40 degree Celsius, and a control system will adjust the appropriate threshold for switching between the two defrosting methods.
Claims14
A multi-range composite-evaporator type cross-defrosting system comprising:
- a) a refrigeration circuit comprising of four sections, which are a refrigerant-compressing section, a refrigerant-condensing section, a refrigerant-evaporating section, and a cross-defrosting section;
- said refrigerant-compressing section provides a flow of pressurized-refrigerant to said refrigerant-condensing section and said cross-defrosting section;
- said refrigerant-condensing section will condense said flow of pressurized-refrigerant therein, and release the heat energy for air-conditioning;
- said refrigerant-condensing section provides a flow of refrigerant to said refrigerant-evaporating section;
- said refrigerant-evaporating section absorbs heat from the outdoor environment and evaporates said flow of refrigerant therein, and then produces a flow of evaporated-refrigerant into said refrigerant-compressing section;
- b) said refrigerant-compressing section comprises at least one compressor (101);
- c) said refrigerant-condensing section comprises at least one main condenser (102);
- d) said refrigerant-evaporating section comprises at least two composite-evaporator units, which are first composite-evaporator (103) and second composite-evaporator (104);
- each of said composite-evaporator consists of one set of evaporation coil and one set of defrost-condensation coil;
- e) said cross-defrosting section comprises one refrigerant passage from said main compressor (101) to the defrost-condensation coil (105) of first composite-evaporator (103) and one refrigerant passage from said main compressor (101) to the defrost-condensation coil (106) of second composite-evaporator (104);
- f) flow control means for independently initiating a flow of pressurized refrigerant from said refrigerant-compressing section to the defrost-condensation coil (105) of said first composite-evaporator (103) during cross-refrigerant defrosting process of said first composite-evaporator (103);
- g) flow control means for independently initiating a flow of pressurized refrigerant from said refrigerant-compressing section to the defrost-condensation coil (106) of said second composite-evaporator (104) during cross-refrigerant defrosting process of said second composite-evaporator (104);
- h) flow control means for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of first composite-evaporator (103) during the cross-air defrosting process of first composite-evaporator (103) and the cross-refrigerant defrosting process of first composite-evaporator (103);
- i) flow control means for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of second composite-evaporator (104) during the cross-air defrosting process of second composite-evaporator (104) and the cross-refrigerant defrosting process of second composite-evaporator (104);
- j) a control system for commencing a defrost-cycle of cross-refrigerant defrosting process by controlling said flow control means and outdoor-air-intake means.
12 more elements
A multi-range composite-evaporator type cross-defrosting system comprising:
- a) a refrigeration circuit comprising of four sections, which are a refrigerant-compressing section, a refrigerant-condensing section, a refrigerant-evaporating section, and a cross-defrosting section;
- b) said refrigerant-compressing section comprises at least one compressor (101);
- c) said refrigerant-condensing section comprises at least one main condenser (102);
- d) said refrigerant-evaporating section comprises at least two composite-evaporator units, which are first composite-evaporator (103) and second composite-evaporator (104);
- each of said composite-evaporator consists of one set of evaporation coil and one set of defrost-condensation coil;
- e) said cross-defrosting section comprises one refrigerant passage from said main compressor (101) to the defrost-condensation coil (105) of first composite-evaporator (103) and one refrigerant passage from said main compressor (101) to the defrost-condensation coil (106) of second composite-evaporator (104);
- f) flow control means for independently initiating a flow of pressurized refrigerant from said refrigerant-compressing section to the defrost-condensation coil (105) of said first composite-evaporator (103) during cross-refrigerant defrosting process of said first composite-evaporator (103);
- g) flow control means for independently initiating a flow of pressurized refrigerant from said refrigerant-compressing section to the defrost-condensation coil (106) of said second composite-evaporator (104) during cross-refrigerant defrosting process of said second composite-evaporator (104);
- h) flow control means for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of first composite-evaporator (103) during the cross-air defrosting process of first composite-evaporator (103) and the cross-refrigerant defrosting process of first composite-evaporator (103);
- i) flow control means for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of second composite-evaporator (104) during the cross-air defrosting process of second composite-evaporator (104) and the cross-refrigerant defrosting process of second composite-evaporator (104);
- j) independent air-intake means and heat insulation means for each composite-evaporator for independently heat air conservation during the associated cross-refrigerant defrosting process of each composite evaporator;
- k) sensor means for detecting the frost condition of each composite-evaporator, and a control system for adjusting the operation threshold for switching between the defrost-cycle of cross-air defrosting process and the defrost cycle of cross-refrigerant defrosting process, wherein:
- during the defrost cycle of cross-refrigerant defrosting process, at least one of said composite-evaporators will continue the refrigerant-evaporation process, thereby sustaining a continuous supply of evaporated refrigerant to said main compressor;
- during the defrost cycle of cross-refrigerant defrosting process, the composite-evaporator that is defrosting will enable a flow of pressurized refrigerant to the associated defrost-condenser, and the associated air-intake means will adjust the venting rate of the outdoor air to conserve the heat air inside the associated heat insulation space, thereby creating a hot environment.
11 more elements
A multi-range composite-evaporator type cross-defrosting system:
- a) a refrigeration circuit comprising of four sections, which are a refrigerant-compressing section, a refrigerant-condensing section, a refrigerant-evaporating section, and a cross-defrosting section;
- said refrigerant-compressing section provides a flow of pressurized-refrigerant to said refrigerant-condensing section and said cross-defrosting section;
- said refrigerant-condensing section will condense said flow of pressurized-refrigerant therein, and release the heat energy for air-conditioning;
- said refrigerant-condensing section provides a flow of refrigerant to said refrigerant-evaporating section;
- said refrigerant-evaporating section absorbs heat from the outdoor environment and evaporates said flow of refrigerant therein, and then produces a flow of evaporated-refrigerant into said refrigerant-compressing section;
- b) said refrigerant-compressing section comprises at least one compressor (101);
- c) said refrigerant-condensing section comprises at least one main condenser (102);
- d) said refrigerant-evaporating section comprises at least two composite-evaporator units, which are first composite-evaporator (103) and second composite-evaporator (104);
- said first composite-evaporator (103) consists of one set of evaporation coil and one set of defrost-condensation coil (105);
- said second composite-evaporator (104) consists of one set of evaporation coil and one set of defrost-condensation coil (106);
- e) said cross-defrosting section comprises one refrigerant passage from said main compressor (101) to the defrost-condensation coil (105) of the first composite-evaporator (103), and said refrigerant passage will be controlled with a first defrost-flow-valve (114) to provide a flow of pressurized refrigerant only during the cross-refrigerant defrosting process of the first composite-evaporator (103);
- f) said cross-defrosting section comprises one refrigerant passage from said main compressor (101) to the defrost-condensation coil (106) of the second composite-evaporator (104), and said refrigerant passage will be controlled with a second defrost-flow valve (113) to provide a flow of pressurized refrigerant only during the cross-refrigerant defrosting process of the second composite-evaporator (104);
- g) air-intake means and heat insulation means for conserving heat air in the first composite-evaporator (103) when the first composite-evaporator (103) is defrosting with the cross-refrigerant defrosting process;
- h) air-intake means and heat insulation means for conserving heat air in the second composite-evaporator (104) when the second composite-evaporator (104) is defrosting with the cross-refrigerant defrosting process;
- i) a first control valve (112) for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of first composite-evaporator (103) when the first composite-evaporator (103) is defrosting with the cross-refrigerant defrosting process;
- j) a second control valve (111) for independently disabling the refrigerant passage from said main compressing section to the evaporation coil of second composite-evaporator (104) when the second composite-evaporator (104) is defrosting with the cross-refrigerant defrosting process;
- k) sensor means for detecting the frost condition of each composite-evaporator;
- l) a control system for commencing the full capacity heating operation and the defrost-cycle of the cross-refrigerant defrosting process by controlling said control valves and air-intake means, wherein:
- said control system will adjust each process duration of said defrost-cycle of the cross-refrigerant defrosting process according to the frost condition of each composite-evaporator;
- during the defrost cycle of the cross-refrigerant defrosting process, at least one of said composite-evaporators will continue the refrigerant-evaporation process, thereby sustaining a continuous supply of evaporated refrigerant to said main compressor (101);
- during the defrost cycle of the cross-refrigerant defrosting process, the composite-evaporator that is defrosting will enable a flow of pressurized refrigerant to the associated defrost-condenser, and the associated air-intake means will adjust the venting rate of the outdoor air to conserve the heat air inside the associated heat insulation space, thereby creating a hot environment;
- during the defrost cycle of the cross-refrigerant defrosting process, the defrost-condenser associated with the composite-evaporator that is defrosting will receive a flow of pressurized refrigerant from said main compressor (101), said flow of pressurized refrigerant will condense and be circulated to the other composite-evaporator of said refrigerant-evaporating section via pressure regulating means.
19 more elements
Dependencies are inferred from the claim text.