Optimum condenser water temperature for water cooled chiller
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-025/00
A61K-048/00
F24F-001/00
출원번호
US-0622321
(2012-09-18)
등록번호
US-9278142
(2016-03-08)
발명자
/ 주소
Goodnow, Christopher A.
출원인 / 주소
Amazon Technologies, Inc.
대리인 / 주소
Kilpatrick Townsend & Stockton LLP
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A computer-implemented method generates a set-point temperature for an evaporative cooler supplying cooled water to a chiller. Under the control of one or more computer systems configured with executable instructions, an achievable temperature for water supplied to the chiller by the evaporative coo
A computer-implemented method generates a set-point temperature for an evaporative cooler supplying cooled water to a chiller. Under the control of one or more computer systems configured with executable instructions, an achievable temperature for water supplied to the chiller by the evaporative cooler is generated based at least in part on an outside wet bulb temperature. A set-point temperature for the water supplied to the chiller by the evaporative cooler is then generated. The set-point temperature is the greater of the achievable temperature and a minimum temperature for water that can be used by the chiller without causing damage to the chiller.
대표청구항▼
1. A computer-implemented method for controlling an evaporative cooler supplying cooled water to a chiller, the method comprising: under the control of one or more computer systems configured with executable instructions, generating an achievable temperature for water supplied to the chiller by the
1. A computer-implemented method for controlling an evaporative cooler supplying cooled water to a chiller, the method comprising: under the control of one or more computer systems configured with executable instructions, generating an achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature and an approach temperature for the evaporative cooler;generating a set-point temperature for the water supplied to the chiller by the evaporative cooler, the set-point temperature being the greater of the achievable temperature and a minimum temperature; andoperating the evaporative cooler by using the set-point temperature to control the evaporative cooler. 2. The computer-implemented method of claim 1, wherein the minimum temperature comprises a low temperature limit for avoidance of oil migration in a refrigerant in the chiller. 3. The computer-implemented method of claim 1, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 55 percent to 90 percent of the maximum operational level of the evaporative cooler. 4. The computer-implemented method of claim 3, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 65 percent to 80 percent of the maximum operational level of the evaporative cooler. 5. The computer-implemented method of claim 1, further comprising: under the control of one or more computer systems configured with executable instructions, generating an updated achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on a second outside wet bulb temperature and the approach temperature for the evaporative cooler;generating an updated set-point temperature for the water supplied to the chiller by the evaporative cooler, the updated set-point temperature being the greater of the minimum temperature and the updated achievable temperature; andoperating the evaporative cooler by using the updated set-point temperature to control the evaporative cooler. 6. The computer-implemented method of claim 1, wherein the achievable temperature is equal to the outside wet bulb temperature plus a temperature offset that varies as a function of the minimum temperature, the outside wet bulb temperature, and the approach temperature for the evaporative cooler. 7. A computer-implemented method for generating a set-point temperature for an evaporative cooler supplying cooled water to a chiller, the method comprising: under the control of one or more computer systems configured with executable instructions, generating an achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature; andgenerating a set-point temperature for the water supplied to the chiller by the evaporative cooler, the set-point temperature being the greater of the achievable temperature and a minimum temperature. 8. The computer-implemented method of claim 7, wherein the minimum temperature comprises a low temperature limit for avoidance of oil migration in a refrigerant in the chiller. 9. The computer-implemented method of claim 7, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 55 percent to 90 percent of the maximum operational level of the evaporative cooler. 10. The computer-implemented method of claim 7, wherein the minimum temperature is calculated via: Tempmin=18.75+Tempout-(1.5⨯Evapdeltatemp⨯(percentloadchiller/100))+(22.0⨯(percenttoadchiller/100))+(manufactureroffset)Where: Tempmin=the minimum temperature of the cool water received by the chiller from the evaporative cooler necessary to avoid oil migration and possible associated damage to the chiller;Tempout=temperature of the chilled water output by the chiller, in Fahrenheit;Evapdelta—temp=the evaporative delta temperature at full load for the chiller;percent_loadchiller=the operating load percentage for the chiller; andmanufacturer offset=an offset that is provided to make sure that the evaporative cooler is operating within the safe temperatures defined by the chiller manufacturer. 11. The computer-implemented method of claim 7, further comprising: under the control of one or more computer systems configured with executable instructions, generating an updated achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an updated outside wet bulb temperature; andgenerating an updated set-point temperature for the water supplied to the chiller by the evaporative cooler, the updated set-point temperature being the greater of the minimum temperature and the updated achievable temperature. 12. The computer-implemented method of claim 7, wherein the achievable temperature is equal to the outside wet bulb temperature plus a temperature offset that varies as a function of the minimum temperature, the outside wet bulb temperature, and an approach temperature for the evaporative cooler. 13. A system for supplying cooled water to a chiller, the system comprising: an evaporative cooler for coupling with a chiller to supply cooled water to the chiller and to receive return water from the chiller;an outside wet bulb temperature source that supplies an outside wet bulb temperature; andone or more computer systems configured with executable instructions to, generate an achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature; andgenerate a set-point temperature for the water supplied to the chiller by the evaporative cooler, the set-point temperature being the greater of the achievable temperature and a minimum temperature. 14. The system of claim 13, wherein the one or more computer systems are configured with executable instructions to operate the evaporative cooler by using the set-point temperature to control the evaporative cooler. 15. The system of claim 13, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 55 percent to 90 percent of the maximum operational level of the evaporative cooler. 16. The system of claim 15, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 65 percent to 80 percent of the maximum operational level of the evaporative cooler. 17. The system of claim 13, wherein the one or more computer systems are configured with executable instructions to: generate an updated achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature; andgenerate an updated set-point temperature for the water supplied to the chiller by the evaporative cooler, the updated set-point temperature being the greater of the minimum temperature and the updated achievable temperature. 18. The system of claim 13, wherein the achievable temperature is equal to the outside wet bulb temperature plus a temperature offset that varies as a function of the minimum temperature for water supplied to the chiller, the outside wet bulb temperature, and the approach temperature for the evaporative cooler. 19. A non-transitory tangible computer readable medium storing instructions executable by one or more computer systems to generate a set-point temperature for an evaporative cooler supplying cooled water to a chiller, the instructions operable to cause the one or more computer systems to: generate an achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature; andgenerate a set-point temperature for the water supplied to the chiller by the evaporative cooler, the set-point temperature being the greater of the achievable temperature and a minimum temperature. 20. The computer readable medium of claim 19, wherein the instructions are further operable to cause the one or more computer systems to operate the evaporative cooler by using the set-point temperature to control the evaporative cooler. 21. The computer readable medium method of claim 19, wherein the achievable temperature corresponds to an operational level of the evaporative cooler in a range of 55 percent to 90 percent of the maximum operational level of the evaporative cooler. 22. The computer readable medium method of claim 21, wherein the minimum temperature is calculated via: Tempmin=18.75+Tempout-(1.5⨯Evapdeltatemp⨯(percentloadchiller/100))+(22.0⨯(percenttoadchiller/100))+(manufactureroffset)Where: Tempmin=the minimum temperature of the cool water received by the chiller from the evaporative cooler necessary to avoid oil migration and possible associated damage to the chiller;Tempout=temperature of the chilled water output by the chiller, in Fahrenheit;Evapdelta—temp=the evaporative delta temperature at full load for the chiller;percent_loadchiller=the operating load percentage for the chiller; andmanufacturer offset=an offset that is provided to make sure that the evaporative cooler is operating within the safe temperatures defined by the chiller manufacturer. 23. The computer readable medium of claim 19, wherein the instructions are further operable to cause the one or more computer systems to: generate an updated achievable temperature for water supplied to the chiller by the evaporative cooler based at least in part on an outside wet bulb temperature; andgenerate an updated set-point temperature for the water supplied to the chiller by the evaporative cooler, the set-point temperature being the greater of the updated achievable temperature and the minimum temperature. 24. The computer readable medium of claim 19, wherein the achievable temperature is equal to the outside wet bulb temperature plus a temperature offset that varies as a function of the minimum temperature for water supplied to the chiller, the outside wet bulb temperature, and an approach temperature for the evaporative cooler.
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이 특허에 인용된 특허 (3)
Robbins Maurice A. (13137 Crewe St. North Hollywood CA 91605), Automatic control for evaporative coolers and the like.
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