Granted Patent B2

US 12,287,149 · App. 18/629,557 · Granted Apr 29, 2025

Inventors: Preston Blay (Silver Spring, MD); Yoon K. Shin (Ellicott City, MD); David Andrew Aaron (Reisterstown, MD)

Assignee: Baltimore Aircoil Company, Inc.

F28C1/14F28F27/003F28C2001/006

Abstract

Claims (71)

1. A heat rejection apparatus comprising:

an air inlet;

an air outlet;

an evaporative heat exchanger;

a primary fan operable to direct first ambient air into the air inlet, cause the first ambient air to interact with the evaporative heat exchanger to produce heated air, and discharge the heated air from the air outlet;

a base;

an adjustable damper of the base, the adjustable damper having:

an open configuration wherein the adjustable damper permits second ambient air from beneath the heat rejection apparatus to enter the heat rejection apparatus and contact the heated air upstream of the air outlet; and

a closed configuration wherein the adjustable damper permits less of the second ambient air to enter the heat rejection apparatus from below the heat rejection apparatus than in the open configuration;

a controller operatively connected to the primary fan and the adjustable damper, the controller configured to shift the adjustable damper from the closed configuration to the open configuration to abate plume.

2. The heat rejection apparatus of claim 1 wherein the adjustable damper in the open configuration thereof permits the second ambient air to flow upwardly into the heat rejection apparatus from beneath the heat rejection apparatus.

3. The heat rejection apparatus of claim 1 further comprising a plenum downstream of the evaporative heat exchanger and upstream of the air outlet; and

wherein the adjustable damper in the open configuration permits the second ambient air to flow into the plenum from beneath the heat rejection apparatus.

4. The heat rejection apparatus of claim 1 further comprising a plume abatement fan operatively connected to the controller; and

wherein the controller is configured to operate the plume abatement fan to direct third ambient air into contact with the heated air to abate plume.

5. The heat rejection apparatus of claim 4 wherein the primary fan is downstream of the evaporative heat exchanger; and

wherein the plume abatement fan is operable to direct the third ambient air into contact with the heated air downstream of the primary fan.

6. The heat rejection apparatus of claim 1 wherein the evaporative heat exchanger includes heat transfer elements, a liquid distribution system configured to distribute a liquid onto the heat transfer elements, and a basin to collect the liquid; and

wherein the adjustable damper is horizontally offset from the heat transfer elements.

7. The heat rejection apparatus of claim 1 wherein the evaporative heat exchanger includes heat transfer elements and a liquid distribution system configured to distribute a liquid onto the heat transfer elements; and

wherein the base is configured to isolate the adjustable damper from the liquid distributed onto the heat transfer elements.

8. The heat rejection apparatus of claim 1 wherein the base includes a basin to collect liquid from the evaporative heat exchanger; and

wherein the base is configured to direct liquid collected in the basin about the adjustable damper.

9. The heat rejection apparatus of claim 1 wherein the base includes a floor; and

wherein the floor includes the adjustable damper.

10. The heat rejection apparatus of claim 1 wherein the evaporative heat exchanger includes heat transfer elements and a liquid distribution system configured to distribute a liquid onto the heat transfer elements;

wherein the base includes a basin for collecting the liquid of the evaporative heat exchanger, the basin including an upper basin portion below the heat transfer elements and a lower basin portion with a liquid outlet, the lower basin portion configured to receive the liquid from the upper basin portion; and

wherein the upper basin portion includes the adjustable damper.

11. The heat rejection apparatus of claim 10 wherein the base includes a divider wall to direct the liquid about the adjustable damper as the liquid travels from the upper basin portion to the lower basin portion.

12. The heat rejection apparatus of claim 1 wherein the controller has a cooling mode wherein the controller causes the adjustable damper to be in the closed configuration.

13. The heat rejection apparatus of claim 1 further comprising a sensor to detect an air variable of at least one of the first ambient air, the second ambient air, and the heated air;

wherein the controller is configured to determine a plume formation condition based at least in part upon the air variable; and

wherein the controller is configured to shift the adjustable damper from the closed configuration to the open configuration based at least in part upon determining the plume formation condition.

14. The heat rejection apparatus of claim 13 wherein the controller is configured to:

receive a setpoint temperature for a process fluid discharged from the heat rejection apparatus;

determine a cooling demand for the heat rejection apparatus based at least in part upon the setpoint temperature;

determine whether the heat rejection apparatus is able to satisfy the cooling demand while performing plume abatement; and

cause the adjustable damper to be in the open configuration based at least in part upon determining the plume formation condition and determining the heat rejection apparatus is able to satisfy the cooling demand while performing plume abatement.

15. The heat rejection apparatus of claim 13 wherein the controller is configured to:

receive a setpoint temperature for a process fluid discharged from the heat rejection apparatus;

determine a cooling demand for the heat rejection apparatus based at least in part upon the setpoint temperature;

determine whether the heat rejection apparatus is able to satisfy the cooling demand while performing plume abatement; and

cause the adjustable damper to be in the closed configuration based at least in part upon determining the plume formation condition and determining the heat rejection apparatus is unable to satisfy the cooling demand while performing plume abatement.

16. The heat rejection apparatus of claim 1 wherein the heat rejection apparatus comprises an outer structure that includes the air inlet, air outlet, and base; and

wherein evaporative heat exchanger is in the outer structure.

17. The heat rejection apparatus of claim 1 wherein the adjustable damper includes a motor, the motor operable to reconfigure the adjustable damper between the open configuration and the closed configuration in response to a signal from the controller.

18. The heat rejection apparatus of claim 1 wherein the evaporative heat exchanger comprises a first evaporative heat exchanger and a second evaporative heat exchanger;

wherein the adjustable damper includes a first adjustable damper and a second adjustable damper;

wherein the first adjustable damper in the open configuration thereof directs a first portion of the second ambient air into contact with the heated air exiting the first evaporative heat exchanger; and

wherein the second adjustable damper in the open configuration thereof directs a second portion of the second ambient air into contact with the heated air exiting the second evaporative heat exchanger.

19. A method of operating a heat rejection apparatus, the method comprising:

operating a primary fan to direct first ambient air into an air inlet of the heat rejection apparatus, causing the first ambient air to interact with an evaporative heat exchanger and produce heated air, and discharging the heated air from an air outlet of the heat rejection apparatus;

determining a plume formation condition based at least in part on an ambient air variable; and

based at least in part upon determining the plume formation condition, opening an adjustable damper of a base of the heat rejection apparatus to direct second ambient air from beneath the heat rejection apparatus into contact with the heated air upstream of the air outlet of the heat rejection apparatus to cool the heated air and abate plume.

20. The method of claim 19 wherein opening the adjustable damper of the base comprises opening the adjustable damper to permit the second ambient air to flow upwardly into the heat rejection apparatus from beneath the heat rejection apparatus.

21. The method of claim 19 wherein opening the adjustable damper of the base comprises opening the adjustable damper to permit the second ambient air to flow into a plenum of the heat rejection apparatus, the plenum downstream of the evaporative heat exchanger and upstream of the air outlet.

22. The method of claim 19 further comprising closing the adjustable damper based at least in part upon a determination of an absence of the plume formation condition.

23. The method of claim 19 further comprising operating a plume abatement fan to direct third ambient air into contact with the heated air downstream of the evaporative heat exchanger.

24. The method of claim 23 wherein operating the plume abatement fan comprises directing the third ambient air into contact with the heated air downstream of the primary fan.

25. The method of claim 19 further comprising causing a liquid distribution system of the evaporative heat exchanger to distribute liquid onto heat transfer elements of the evaporative heat exchanger, the heat transfer elements being horizontally offset from the adjustable damper.

26. The method of claim 19 further comprising:

collecting liquid distributed onto heat transfer elements of the evaporative heat exchanger; and

directing the collected liquid about the adjustable damper.

27. The method of claim 19 further comprising:

receiving a setpoint temperature for a process fluid discharged from the heat rejection apparatus;

wherein causing the first ambient air to interact with the evaporative heat exchanger comprises cooling the process fluid;

determining a cooling demand for the heat rejection apparatus based at least in part upon the setpoint temperature;

determining whether the heat rejection is able to satisfy the cooling demand while performing plume abatement; and

wherein opening the adjustable damper of the base includes opening the adjustable damper in response to determining the plume formation condition and determining the heat rejection apparatus is able to satisfy the cooling demand while performing plume abatement.

28. The method of claim 19 wherein the base of the heat rejection apparatus comprises a floor, the floor including the adjustable damper; and

wherein opening the adjustable damper includes opening the adjustable damper of the floor of the heat rejection apparatus to permit the second ambient air to flow upwardly into the adjustable damper from beneath the floor of the heat rejection apparatus.

Assignments (2)

Continuity (3)

References Cited (203)