US Patent No: 6,209,334
Number of patents in Portfolio can not be more than 2000
Systems and methods for capacity regulation of refrigeration systems
Stats
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Apr 3, 2001
Issued date -
Jul 18, 2000
filing date -
09/618,292
serial no -
In Force
status
Importance
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Abstract
An arrangement is provided for insuring that excessive demand is not placed on a refrigeration unit that supplies pressurized subcooled refrigerant to different channels having independent needs for use of refrigeration capacity. A separate reference channel receives a portion of the refrigerant and expands the refrigerant fully to a gas phase to establish a minimum level reference temperature. In the operative channels the refrigerant flows into individual evaporators/heat exchangers at rates set by external command signals, the refrigerant being in heat exchange relation with thermal transfer fluid in the evaporator/heat exchanger. Evaporation of refrigerant in each channel thus brings the thermal transfer fluid for that channel to the target temperature. By comparing the post evaporation temperature in each channel to the reference temperature and reducing the refrigerant flow rate whenever the difference is below a threshold, individual channels are not overtaxed and the system remains stable.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,632,358 Automotive air conditioning system including electrically operated expansion valve | 35 | 1985 | |
| 4,794,762 Refrigerant flow control system | 18 | 1987 | |
| 4,841,734 Indicating refrigerant liquid saturation point | 28 | 1987 | |
| 4,835,976 Controlling superheat in a refrigeration system | 26 | 1988 | |
| 4,995,240 Controlling refrigeration having control module directly attached on valve body | 11 | 1989 | |
| 4,984,735 Sensing refrigerant temperature in a thermostatic expansion valve | 21 | 1990 | |
| 5,187,944 Variable superheat target strategy for controlling an electrically operated refrigerant expansion valve | 11 | 1992 | |
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| 6,102,113 Temperature control of individual tools in a cluster tool system | 15 | 1997 | |
| 6,109,047 Systems and methods for capacity regulation of refrigeration systems | 9 | 1998 | |
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| 4,461,635 Cryopump or heat pump circuit | 8 | 1982 | |
| 4,475,686 Valve for liquid injection into a refrigerant evaporator | 22 | 1983 | |
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| 5,148,978 Cooling machine and an optimalized thermostatic expansion valve therefor | 10 | 1991 | |
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| 5,546,757 Refrigeration system with electrically controlled expansion valve | 32 | 1994 | |
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| 5,515,695 Refrigerating apparatus | 19 | 1995 | |
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| 4,811,568 Refrigeration sub-cooler | 15 | 1988 | |
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| 4,745,767 System for controlling flow rate of refrigerant | 47 | 1987 | |
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| 5,201,190 Refrigerator with subcooling flow control valve | 8 | 1992 | |
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| 5,195,331 Method of using a thermal expansion valve device, evaporator and flow control means assembly and refrigerating machine | 25 | 1991 | |
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| 4,879,879 Apparatus for controlling a thermostatic expansion valve | 18 | 1988 | |