Refrigerating system and method for controlling the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-001/00
F25B-041/04
F25B-041/06
F25B-009/00
출원번호
US-0682440
(2007-10-10)
등록번호
US-10254025
(2019-04-09)
국제출원번호
PCT/EP2007/008818
(2007-10-10)
§371/§102 date
20100712
(20100712)
국제공개번호
WO2009/046740
(2009-04-16)
발명자
/ 주소
Gassen, Heinz
Leweke, Peter
출원인 / 주소
Carrier Corporation
대리인 / 주소
O'Shea Getz P.C.
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
A refrigerating system according to the invention includes a refrigerant circuit having at least one compressor, a condenser/gascooler, an intermediate pressure container, at least one evaporator and a respective expansion device before said at least one evaporator, and refrigerant pipes connecting
A refrigerating system according to the invention includes a refrigerant circuit having at least one compressor, a condenser/gascooler, an intermediate pressure container, at least one evaporator and a respective expansion device before said at least one evaporator, and refrigerant pipes connecting said elements and circulating a refrigerant therethrough; a high pressure regulating device between the condenser/gascooler and the intermediate pressure container, expanding the refrigerant from a high pressure level to an intermediate pressure level; an intermediate pressure sensor sensing the intermediate pressure level; and a control unit controlling the high pressure regulating device. The control unit in operation limits the maximum refrigerant flow through the high pressure regulating device to a maximum flow value FMax, if the sensed intermediate pressure level exceeds a predetermined threshold value PIntTh.
대표청구항▼
1. Refrigerating system having a refrigerant circuit comprising: at least one compressor, a condenser/gascooler, an intermediate pressure container, at least one evaporator and a respective expansion device before said at least one evaporator, and refrigerant pipes connecting said elements and circu
1. Refrigerating system having a refrigerant circuit comprising: at least one compressor, a condenser/gascooler, an intermediate pressure container, at least one evaporator and a respective expansion device before said at least one evaporator, and refrigerant pipes connecting said elements and circulating a refrigerant therethrough;a high pressure regulating device between the condenser/gascooler and the intermediate pressure container, expanding the refrigerant from a high pressure level to an intermediate pressure level;an intermediate pressure sensor sensing the intermediate pressure level; anda control unit controlling the high pressure regulating device;wherein the control unit is configured to set a maximum flow value FMax as a limit for a refrigerant flow through the high pressure regulating device,wherein the control unit is configured to compare the sensed intermediate pressure level to a fixed predetermined threshold value PIntTh, wherein the predetermined threshold value PIntTh is between a fixed reference intermediate pressure value PIntRef, being the desired operating point of the intermediate pressure level, and a maximum allowable intermediate pressure value PIntMax,wherein the control unit is configured, as a function of said comparison of the sensed intermediate pressure level to the predetermined threshold value PIntTh, to set the maximum flow value FMax to less than a maximum flow value FTecMax that the high pressure regulating device technically supports,wherein the refrigerant circuit additionally comprises a high pressure sensor sensing the high pressure level, wherein the control unit is configured to set a desired actual flow value for the refrigerant flow through the high pressure regulating device based on the sensed high pressure level, wherein the desired actual flow value does not exceed the maximum flow value FMax. 2. Refrigerating system according to claim 1, wherein the predetermined threshold value PIntTh is set according to the formula: PIntTh=PIntRef+CTh(PIntMax−PIntRef),wherein CTh is a constant lying between 0.25 and 0.5. 3. Refrigerating system according to claim 1, wherein the control unit in operation sets the maximum flow value FMax using a monotonically decreasing function of the intermediate pressure level PInt. 4. Refrigerating system according to claim 3, wherein the maximum flow value FMax is set according to the formula: FMax=FTecMax(1−CP(PInt−PIntTh)),wherein CP is a proportionality constant. 5. Refrigerating system according to claim 4, wherein the proportionality constant CP is adaptable to adjust the refrigerating system to various operating conditions. 6. Refrigerating system according to claim 1, wherein the refrigerant flow through the high pressure regulating device is adjusted by changing a degree of aperture thereof. 7. Refrigerating system according to claim 1, wherein the intermediate pressure container in operation separates liquid refrigerant from gaseous refrigerant. 8. Refrigerating system according to claim 7, wherein the refrigerant circuit also comprises a gaseous refrigerant refeed pipe connecting a gas space of the intermediate pressure container with the at least one compressor and an intermediate pressure regulating device arranged within the gaseous refrigerant refeed pipe. 9. Refrigerating system according to claim 1, wherein the condenser/gascooler and the intermediate pressure container each have at least one safety valve associated therewith, the safety valves being adapted to release refrigerant when a pressure reaches a critical level in the respective elements of the refrigerating system. 10. Refrigerating system according to claim 1, wherein, in case of the high pressure level approaching a critical value, the control unit stops limiting the refrigerant flow to the maximum refrigerant flow FMax. 11. Refrigerating system according to claim 1, wherein, in case of the high pressure level approaching a critical value, the control unit subsequently switches off compressor stages of the at least one compressor. 12. Refrigerating system according to claim 1, wherein the refrigerant is CO2. 13. Method for controlling a refrigerating system comprising a refrigerant circuit having at least one compressor, a condenser/gascooler, an intermediate pressure container, at least one evaporator and a respective expansion device before said at least one evaporator, and refrigerant pipes connecting said elements and circulating a refrigerant therethrough; a high pressure regulating device between the condenser/gascooler and the intermediate pressure container, expanding the refrigerant from a high pressure level to an intermediate pressure level; an intermediate pressure sensor sensing the intermediate pressure level; and a high pressure sensor sensing the high pressure level; the method comprising the steps of:comparing the sensed intermediate pressure level to a fixed predetermined threshold value PIntTh, wherein the predetermined threshold value PIntTh is between a fixed reference intermediate pressure value PIntRef, being the desired operating point of the intermediate pressure level and a maximum allowable intermediate pressure value PIntMax,on the basis of said step of comparing the sensed intermediate pressure level to the predetermined threshold value PIntTh, setting a maximum flow value FMax, which maximum flow value is set to less than a maximum flow value FTecMax that the high pressure regulating device technically supports,limiting a refrigerant flow through the high pressure regulating device to the maximum flow value FMax, andsetting a desired actual flow value for the refrigerant flow through the high pressure regulating device based on the sensed high pressure level, wherein the desired actual flow value does not exceed the maximum flow value FMax.
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이 특허에 인용된 특허 (5)
Tobias H. Sienel, High pressure regulation in economized vapor compression cycles.
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