Sequential defrosting of refrigerated display cases
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25D-021/06
F25B-047/02
출원번호
US-0877565
(2001-06-07)
발명자
/ 주소
Wellman, Keith E.
대리인 / 주소
Fellers, Snider, et al.
인용정보
피인용 횟수 :
12인용 특허 :
3
초록▼
The invention is a method and a defroster control circuit to sequentially defrost a series of refrigerated display cases. The method begins by operating the series of refrigerated display cases during a normal refrigeration mode. At the beginning of the refrigeration mode, a refrigeration time is se
The invention is a method and a defroster control circuit to sequentially defrost a series of refrigerated display cases. The method begins by operating the series of refrigerated display cases during a normal refrigeration mode. At the beginning of the refrigeration mode, a refrigeration time is set to zero and an elapsed refrigeration time is subsequently monitored. When the refrigeration time equals an activation time, a defrost mode begins and a defrost cycle for the first case starts. The defrost mode for the first case terminates based either on a defrost time criterion or a defrost temperature criterion. After the first refrigerated display case is defrosted, a refrigeration mode is restarted for the first case. After the first refrigerated display case is defrosted, the other refrigerated display cases in the series of refrigerated display cases are then sequentially defrosted.
대표청구항▼
The invention is a method and a defroster control circuit to sequentially defrost a series of refrigerated display cases. The method begins by operating the series of refrigerated display cases during a normal refrigeration mode. At the beginning of the refrigeration mode, a refrigeration time is se
The invention is a method and a defroster control circuit to sequentially defrost a series of refrigerated display cases. The method begins by operating the series of refrigerated display cases during a normal refrigeration mode. At the beginning of the refrigeration mode, a refrigeration time is set to zero and an elapsed refrigeration time is subsequently monitored. When the refrigeration time equals an activation time, a defrost mode begins and a defrost cycle for the first case starts. The defrost mode for the first case terminates based either on a defrost time criterion or a defrost temperature criterion. After the first refrigerated display case is defrosted, a refrigeration mode is restarted for the first case. After the first refrigerated display case is defrosted, the other refrigerated display cases in the series of refrigerated display cases are then sequentially defrosted. UB>or, in the case of orifice tube systems with clutch cycling switch of LPmin,HPmax,HPmax-APmin,HPmax-BPmin; Timin,ton,toff,with a set of parameters of reference, and transmission of messages D1, D2, . . . according to predetermined sequences of conditions wherein said values overcome or are less than said parameters. 7. A device for testing and diagnosing air-conditioning apparatus on vehicles, said systems comprising a high pressure side with a condenser, a low pressure side with an evaporator from which cool air is created, said sides being respectively downstream and upstream of a compressor, comprising: means for measuring the pressure HP on the high pressure side; means for measuring the pressure LP on the low pressure side; means for measuring the environment temperature Ta characterized in that it comprises: means for measuring the temperature Ti of the air coming from the evaporator; a microprocessor computing unit, operatively connected with said means for measuring, for storing the values of the pressures (AP,BP) and of the temperature (Ta and Ti) measured in a predetermined range of time (t) from said means for measuring, in said unit a program residing of diagnosis suitable for being run on the basis of the stored values; means for producing diagnosis messages calculated by said program responsive to the measured values. 8. Device according to claim 7 wherein in the case of orifice tube system with clutch cycling switch means are provided for measuring the average time ton of operation of the compressor of the apparatus and of the average time toffof disconnection of the compressor responsive to the environment temperature (Ta) in normal conditions of operation of the apparatus. 9. Device according to claim 7, wherein means are provided for the input of parameters of the conditioning apparatus, among which: type of refrigerant used, chosen between R12 or R134a, type of conditioning system present, chosen among traditional system (expansion valve system), orifice tube system with or without clutch cycling switch or orifice tube system without clutch cycling switch. 10. Device according to claim 9, wherein said means for input comprise an insertable magnetic support on which said parameters of the circuit have been previously stored, said device providing means for reading said magnetic support connected to said microprocessor computing unit.
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이 특허에 인용된 특허 (3)
Willitts, Benjamin R.; Zickwolf, Elmer D., Automatic defrost control for refrigeration systems.
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