TRANSPORTATION REFRIGERATION SYSTEM WITH UNEQUAL SIZED HEAT EXCHANGERS

• US 20190316827A1
• Filed: 03/01/2019
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Senf, Jr., Raymond L., Call, Herbert J.
• Granted Patent: US 11,098,943 B2
• Time in Patent Office: Days
• CPC Class Codes: B60H 1/323 characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
• CPC Class Codes: B60H 1/3232 particularly adapted for load transporting vehicles B60H1/3226 takes precedence
• CPC Class Codes: F25B 2600/112 of evaporator fans
• CPC Class Codes: F25B 2600/2513 Expansion valves
• CPC Class Codes: F25B 49/02 for compression type machines, plants or systems
• CPC Class Codes: F25B 5/02 arranged in parallel
• CPC Class Codes: F25D 11/003 Transport containers
• CPC Class Codes: F25D 11/022 with two or more evaporators
• CPC Class Codes: F25D 17/06 by forced circulation
• CPC Class Codes: F25D 2317/061 through special compartments
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A transportation refrigeration system includes a refrigeration circuit that includes a compressor, a condenser, a first expansion device upstream of a first heat exchanger and a second expansion device upstream of a second heat exchanger. The first heat exchanger includes a first cooling capacity that is different from a second cooling capacity of the second heat exchanger.

Claims

1. A transportation refrigeration system comprising:

a refrigeration circuit including a compressor, a condenser, a first expansion device upstream of a first heat exchanger, and a second expansion device upstream of a second heat exchanger, wherein the first heat exchanger includes a first cooling capacity that is different from a second cooling capacity of the second heat exchanger.

2. The transportation refrigeration system of claim 1, further comprising a first compartment passageway having a first compartment passageway inlet located upstream of the first heat exchanger and a first fan located downstream of the first heat exchanger.

3. The transportation refrigeration system of claim 2, including a first nozzle downstream of the first fan having a first compartment outlet.

4. The transportation refrigeration system of claim 3, further comprising a second compartment passageway having a second compartment passageway inlet located upstream of the second heat exchanger and a second fan located downstream of the second heat exchanger.

5. The transportation refrigeration system of claim 4, including a second nozzle downstream of the second fan having a second compartment outlet.

6. The transportation refrigeration system of claim 5, wherein the first compartment outlet is spaced from the second compartment outlet.

7. The transportation refrigeration system of claim 5, wherein the first cooling capacity is greater than the second cooling capacity, the first fan includes a first maximum flow rate, and the second fan includes a second maximum flow rate that is less than the first maximum flow rate.

8. The transportation refrigeration system of claim 1, wherein the first cooling capacity includes at least 55% of a total cooling capacity of the refrigeration system and the second cooling capacity includes no more than 45% of the total cooling capacity of the refrigeration system.

9. The transportation refrigeration system of claim 8, wherein the first cooling capacity includes at least two thirds of the total cooling capacity of the refrigeration system and the second cooling capacity includes no more than one third of the total cooling capacity of the refrigeration system.

10. The transportation refrigeration system of claim 8, wherein the first heat exchanger includes a first fin density and the second heat exchanger includes a second fin density and the first fin density is different from the second fin density.

11. The transportation refrigeration system of claim 8, wherein the first heat exchanger includes a first exchanger face surface area and the second heat exchanger includes a second exchanger face surface area and the first exchanger face surface area is greater than the second exchanger face surface area.

12. The transportation refrigeration system of claim 8, wherein the first expansion device is a first electronically controlled expansion valve and the second expansion device is a second electronically controlled expansion valve and a controller is configured to control refrigerant flow to the first heat exchanger by controlling the first electronically controlled expansion valve and is configured to control refrigerant flow to the second heat exchanger by controlling the second electronically controlled expansion valve.

13. A method of operating a refrigeration cycle comprising the steps of:

conditioning a first compartment in a cargo space to a first temperature with a first heat exchanger having a first cooling capacity; and

conditioning a second compartment in the cargo space to a second temperature with a second heat exchanger having a second cooling capacity;

wherein the first cooling capacity is greater than the second cooling capacity.

14. The method of claim 13, wherein the first cooling capacity includes at least 55% of a total cooling capacity of the refrigeration system and the second cooling capacity includes no more than 45% of the total cooling capacity of the refrigeration system.

15. The method of claim 14, wherein the first cooling capacity includes at least two thirds of the total cooling capacity of the refrigeration system and the second cooling capacity includes no more than one third of the total cooling capacity of the refrigeration system.

16. The method of claim 14, wherein the first heat exchanger includes a first fin density and the second heat exchanger includes a second fin density and the first fin density is different from the second fin density.

17. The method of claim 14, wherein the first heat exchanger includes a first exchanger face surface area and the second heat exchanger includes a second exchanger face surface area and the first exchanger face surface area is greater than the second exchanger face surface area.

18. The method of claim 14, further comprising:

operating a first fan associated with the first heat exchanger at a first maximum flow rate; and

operating a second fan associated with the second heat exchanger at a second maximum flow rate that is less than the first maximum flow rate.

19. The method of claim 18, wherein operating the first fan includes drawing air from the first compartment into a first compartment passageway inlet, over the first heat exchanger and through a first nozzle having a first compartment passageway outlet.

20. The method of claim 19, wherein operating the second fan includes drawing air from the second compartment into a second compartment passageway inlet, over the second heat exchanger and through a second nozzle having a second compartment passageway outlet spaced from the first compartment passageway outlet.