Staging control for an evaporative media system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F24F-005/00
F28C-003/08
A61L-002/10
B01F-003/04
F25B-039/02
F25D-007/00
G05D-009/12
F24F-006/04
F24F-001/00
출원번호
US-0598880
(2015-01-16)
등록번호
US-9675719
(2017-06-13)
발명자
/ 주소
Kirkwold, Mark Allen
Farley, Cole K.
Lundgreen, James M.
출원인 / 주소
Dri-Steem Corporation
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
1인용 특허 :
5
초록▼
A staging control process for an evaporative media cooling system having a plurality of media stages is disclosed. In one step, a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system is received or defined. In one aspect, an expected media exit dry bulb temp
A staging control process for an evaporative media cooling system having a plurality of media stages is disclosed. In one step, a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system is received or defined. In one aspect, an expected media exit dry bulb temperature is calculated for each media stage based on a dry bulb temperature and a wet bulb temperature of air entering the media cooling system and based on a measured or assigned condition of the media. In another aspect, an estimated combined leaving dry bulb temperature is calculated for different combinations of activated and deactivated media stages. Once the estimated leaving temperature is known, the method can then activate the media stage(s) associated with the combination that has an estimated combined leaving dry bulb temperature that is nearest to but less than the leaving air dry bulb temperature setpoint.
대표청구항▼
1. A staging control process for an evaporative media cooling system having a plurality of media stages, the staging control process including the steps of: a. defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system;b. calculating an exp
1. A staging control process for an evaporative media cooling system having a plurality of media stages, the staging control process including the steps of: a. defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system;b. calculating an expected media exit dry bulb temperature for each media stage based on a dry bulb temperature and a wet bulb temperature of air entering the media cooling system and based on a measured or assigned condition of the media;c. calculating an estimated combined leaving dry bulb temperature for different combinations of activated and deactivated media stages; andd. activating the media stage(s) associated with the combination that has an estimated combined leaving dry bulb temperature that is nearest to but less than or equal to the leaving air dry bulb temperature setpoint. 2. The staging control process of claim 1, further comprising the steps of: a. defining a plurality of allowed unit staging configurations, each of which representing a different combination of activated and deactivated media stages from all other allowed unit staging configurations. 3. The staging control process of claim 2, wherein: a. the step of calculating an estimated combined leaving dry bulb temperature for each different combination of activated and deactivated media stages includes calculating an estimated combined leaving dry bulb temperature for each allowed unit staging configuration. 4. The staging control process of claim 2, wherein: a. the step of defining a plurality of allowed unit staging configurations includes defining: i. a first configuration in which a first media stage is activated and a second media stage is deactivated;ii. a second configuration in which the second media stage is activated and the first media stage is deactivated;iii. a third configuration in which both the first and second media stages are activated. 5. The staging control process of claim 4, wherein: a. the step of defining a first configuration includes selecting a first media stage that has an output capacity that is about one third of a total output capacity of the system; andb. the step of defining a second configuration includes selecting a second media stage that has an output capacity that is about two thirds of a total output capacity of the system. 6. The staging control process of claim 1, wherein: a. wherein the step of calculating an estimated combined leaving dry bulb temperature for each different combination of activated and deactivated media stages includes assigning each deactivated media stage a leaving dry bulb temperature equal to the entering air dry bulb temperature and assigning each activated media stage a leaving dry bulb temperature equal to the expected media exit dry bulb temperature. 7. The staging control process of claim 1, wherein: a. the step of calculating an estimated combined leaving dry bulb temperature for different combinations of activated and deactivated media stages includes calculating an estimated combined leaving dry bulb temperature for every possible combination of activated and deactivated media stages. 8. The staging control process of claim 1, wherein: a. the step of activating the media stages includes operating one or more pumps associated with each activated stage. 9. The staging control process of claim 1, wherein: a. the step of defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system includes receiving the setpoint from an electronic controller associated with an air handling system within which the evaporative media system is installed, or defining the setpoint in an electronic controller associated with the evaporative media system. 10. The staging control process of claim 1, wherein: a. the step of calculating an expected media exit dry bulb temperature based on a measured or assigned condition of the media, includes one of: i. using a constant value for the condition of the media;ii. calculating a value for the condition of the media based on operating parameters of the evaporative media system;iii. using a user input value for the condition of the media; andiv. measuring a value for the condition of the media based on operating parameters of the evaporative media system. 11. A staging control process for an evaporative media cooling system having a plurality of media stages, the staging control process including the steps of: a. defining a plurality of allowed unit staging configurations, each of which represents a combination of activated and deactivated media stages;b. defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system;c. calculating an estimated combined leaving dry bulb temperature for each allowed unit staging configuration, wherein each deactivated media stage in the configuration is assigned a first leaving dry bulb temperature and wherein each activated media stage is assigned a second dry bulb temperature; andd. activating the stages associated with the allowed unit staging configuration that has an estimated combined leaving dry bulb temperature that is nearest to but less than or equal to the leaving air dry bulb temperature setpoint. 12. The staging control process of claim 11, further comprising the steps of: a. each of the allowed unit staging configurations represents a different combination of activated and deactivated media stages from all other allowed unit staging configurations. 13. The staging control process of claim 11, wherein: a. the step of defining a plurality of allowed unit staging configurations includes defining: i. a first configuration in which a first media stage is activated and a second media stage is deactivated;ii. a second configuration in which the second media stage is activated and the first media stage is deactivated;iii. a third configuration in which both the first and second media stages are activated. 14. The staging control process of claim 11, wherein: a. the step of defining a plurality of allowed unit staging configurations includes defining configurations based on activating and deactivating different combinations of a first media stage, a second media stage, and a third media stage. 15. The staging control process of claim 14, wherein a. the step of defining a plurality of allowed unit staging configurations includes selecting a first media stage that has an output capacity that is about 15 percent of a total output capacity of the system, selecting a second media stage that has an output capacity that is about 30 percent of the total output capacity of the system, and selecting a second media stage that has an output capacity that is about 55 percent of the total output capacity of the system. 16. The staging control process of claim 11, wherein: a. the step of activating the media stages includes activating a pump associated with each activated stage. 17. A control system for an evaporative media cooling system comprising a plurality of media stages, the control system comprising: a. a controller having a processor and a non-transient storage medium or memory configured to selectively activate and deactivate each media stage;b. the controller being further configured to implement a staging control process including the steps of: i. defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system;ii. calculating an expected media exit dry bulb temperature for each media stage based on a dry bulb temperature and a wet bulb temperature of air entering the media cooling system and based on a measured or assigned condition of the media;iii. calculating an estimated combined leaving dry bulb temperature for different combinations of activated and deactivated media stages; andiv. activating the media stage(s) associated with the combination that has an estimated combined leaving dry bulb temperature that is nearest to but less than or equal to the leaving air dry bulb temperature setpoint. 18. The control system of claim 17, wherein: a. the controller is an electronic controller that is configured to generate an output signal to one or more fluid pumps associated with the media stages. 19. The control system of claim 17, wherein: a. the controller is configured to implement the step of calculating an expected media exit dry bulb temperature based on a measured or assigned condition of the media by implementing one of: i. using a constant value for the condition of the media;ii. calculating a value for the condition of the media based on operating parameters of the evaporative media system;iii. using a user input value for the condition of the media; andiv. measuring a value for the condition of the media based on operating parameters of the evaporative media system. 20. The control system of claim 17, wherein: a. the step of defining or receiving a leaving air dry bulb temperature setpoint for air exiting the evaporative media cooling system includes receiving the setpoint from an second controller associated with an air handling system within which the evaporative media system is installed.
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