Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Reexamination Certificate
2007-04-24
2007-04-24
Jiang, Chen-Wen (Department: 3744)
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
C062S217000, C062S200000, C062S223000
Reexamination Certificate
active
10843756
ABSTRACT:
A method for regulating a most loaded circuit of a refrigeration system is provided. Each circuit includes at least one case and an EEPR valve. At least one controller communicates with the EEPR valves for receiving signals from the circuits corresponding to operating conditions for each circuit, and for issuing command signals to the EEPR valves and compressor. The operation of each circuit is monitored and a load signal is calculated for each circuit. The load signals for each circuit are compared and the most loaded circuit is determined. The EEPR valve of the most loaded circuit is adjusted to be approximately 100 percent open and a suction pressure of the compressor is adjusted to move a circuit temperature of the most loaded circuit to a target temperature. The process of selecting and regulating the most loaded circuit is repeated after a predetermined period of time.
REFERENCES:
patent: 4084388 (1978-04-01), Nelson
patent: 5867995 (1999-02-01), Lewis
patent: 6301911 (2001-10-01), Reason et al.
patent: 6449968 (2002-09-01), Singh et al.
patent: WO 01/67014 (2001-09-01), None
Bendtsen Christian
Jessen Lars Mou
Danfoss A/S
Jiang Chen-Wen
McCormick Paulding & Huber LLP
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