Methods and apparatus for operating a refrigeration system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-043/02
F25B-013/00
출원번호
US-0919799
(1992-07-27)
발명자
/ 주소
Sjoholm Lars I. (Burnsville MN) Freund Peter W. (Bloomington MN) Kwon Sung L. (Burnsville MN) Naley Lowell B. (Minnetonka MN) Erickson Lee J. (Eagan MN) Taylor David H. (Minneapolis MN)
출원인 / 주소
Thermo King Corporation (Minneapolis MN 02)
인용정보
피인용 횟수 :
34인용 특허 :
0
초록▼
A refrigeration system of the type having an economizer cycle is provided with a null cycle, in addition to heating and cooling cycles, without shutting a compressor prime mover down, to preserve air flow in a conditioned space. First, second and third controllable valves respectively: (1) select ma
A refrigeration system of the type having an economizer cycle is provided with a null cycle, in addition to heating and cooling cycles, without shutting a compressor prime mover down, to preserve air flow in a conditioned space. First, second and third controllable valves respectively: (1) select main and auxiliary condensers, (2) open and close a liquid line, and (3) open and close a line which provides a warm liquid to an economizer heat exchanger. The valves are controlled in at least one predetermined open/close pattern during a null cycle, and preferably in a plurality of selectable predetermined open/close patterns, to provide a null cycle at any instant which substantially matches the net heat gain or loss taking place in the conditioned space. Thus, the temperature of the served space will be more apt to remain in a null temperature range close to set point, providing smoother and more accurate control over the temperature of the conditioned space for longer shelf life of perishables stored therein.
대표청구항▼
A method of operating a refrigeration system which achieves and holds a predetermined set point temperature in a conditioned space via cooling and heating cycles, with the refrigeration system including a refrigerant compressor which includes a suction port, an intermediate pressure port, and a disc
A method of operating a refrigeration system which achieves and holds a predetermined set point temperature in a conditioned space via cooling and heating cycles, with the refrigeration system including a refrigerant compressor which includes a suction port, an intermediate pressure port, and a discharge port, a compressor prime mover, a hot gas compressor discharge line, first and second hot gas lines, first controllable valve means having first and second positions which respectively connect the hot gas compressor discharge line to the first and second hot gas lines, a main condenser connected to the first hot gas line, an evaporator associated with the conditioned space, an evaporator expansion valve, -an auxiliary condenser associated with the conditioned space, which is connected to the second hot gas line, economizer heat exchanger means having first and second refrigerant flow paths, an economizer expansion valve which controls, the rate of refrigerant flow through the second refrigerant flow path, a main liquid line which connects the main condenser to the evaporator expansion valve via the first refrigerant flow path of the economizer heat exchanger means, an auxiliary liquid line which connects the auxiliary condenser to the economizer heat exchanger means, a main suction line which connects the evaporator to the suction port of the compressor, an auxiliary suction line which connects the second flow path of the economizer heat exchanger means to the intermediate pressure port of the compressor, second controllable valve means having first and second positions which respectively block and unblock the main liquid line, and third controllable valve means for selectively adding heat to the economizer heat exchanger means, characterized by the steps of: providing at least one predetermined null related pattern of valve positions for the first, second and third controllable valve means, providing a null cycle when the temperature of the conditioned space is in a predetermined null temperature range adjacent to the predetermined set point temperature while maintaining operation of the refrigerant compressor, said step of providing a null cycle including the step of selecting said at least one predetermined null associated pattern of valve positions.
Senf, Jr., Raymond L.; Stockbridge, Michael; Reason, John R., Closed loop capacity and power management scheme for multi stage transport refrigeration system.
Hanson Jay L. (Bloomington MN) Nixon James E. (Woodbury MN) Hoium Stanley O. (Eagan MN) Freund Peter W. (Bloomington MN), Methods and apparatus for operating a refrigeration unit.
Freund Peter W. (Bloomington MN) Sjoholm Lars I. (Burnsville MN) LaBossiere Joseph E. (Lino Lakes MN), Refrigeration system and method utilizing combined economizer and engine coolant heat exchanger.
Hoium Stanley O. ; Freund Peter W., Temperature control system and method for efficiently obtaining and maintaining the temperature in a conditioned space.
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