Air-conditioning system

Patent metadata

Field	Value
Publication number	US-11226112-B2
Application number	US-202117190229-A
Country	US
Kind code	B2
Filing date	Mar 2, 2021
Priority date	Sep 28, 2018
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

In an air-conditioning system including a thermal storage heat exchanger, a refrigerant circuit is configured such that an indoor heat exchanger and a receiver communicate with the thermal storage heat exchanger when an operational mode of the refrigerant circuit is switched to a cooling operation in which the thermal storage heat exchanger serves as a radiator and the indoor heat exchanger serves as an evaporator.

First claim

The invention claimed is:

1. An air-conditioning system having a refrigerant circuit to which a thermal storage heat exchanger is connected, the air-conditioning system comprising:
a refrigerant container capable of introducing a liquid refrigerant, wherein
the refrigerant circuit is configured such that the refrigerant container and an indoor heat exchanger of the refrigerant circuit are connected in parallel with respect to the thermal storage heat exchanger when an operational mode is switched to a first cooling operation in which the thermal storage heat exchanger serves as a radiator and the indoor heat exchanger serves as an evaporator, such that parts of the refrigerant flowing out of the thermal storage heat exchanger dividedly flow into the refrigerant container and the indoor heat exchanger, respectively.

2. The air-conditioning system of claim 1 , further comprising
a first valve configured to open and close a refrigerant introduction pipe connected to the thermal storage heat exchanger and the refrigerant container.

3. The air-conditioning system of claim 1 , further comprising
a first valve configured to open and close a refrigerant introduction pipe connected to the thermal storage heat exchanger and the refrigerant container, wherein
the refrigerant container includes a venting pipe releasing a gas refrigerant out of the refrigerant container, and
in the first cooling operation, the venting pipe is connected to a low-pressure pipe of the refrigerant circuit via a second valve.

4. The air-conditioning system of claim 2 , further comprising
a control unit configured to adjust the valve so as to open the first valve when the operational mode is switched to the first cooling operation.

5. The air-conditioning system of claim 3 , further comprising
a control unit configured to adjust only the first valve so as to open the first valve, or adjust both the first valve and the second valve so as to open both the first valve and the second valve when the operational mode is switched to the first cooling operation.

6. The air-conditioning system of claim 4 , wherein
the first valve has an opening degree that is adjustable, and
the control unit is configured to control the opening degree of the first valve such that a pressure of a refrigerant in the thermal storage heat exchanger reaches a target value.

7. The air-conditioning system of claim 4 , wherein
the first valve has an opening degree that is adjustable, and
the control unit is configured to control the opening degree of the first valve such that a degree of subcooling of a refrigerant on an outlet side of the thermal storage heat exchanger reaches a target value.

8. The air-conditioning system of claim 5 , wherein
at least one of the first valve and the second valve has an opening degree that is adjustable, and
the control unit is configured to control the opening degree of the at least one of the first valve and the second valve such that a pressure of a refrigerant in the thermal storage heat exchanger reaches a target value.

9. The air-conditioning system of claim 5 , wherein
at least one of the first valve and the second valve has an opening degree that is adjustable, and
the control unit is configured to control the opening degree of the at least one of the first valve and the second valve such that a degree of subcooling of a refrigerant on an outlet side of the thermal storage heat exchanger reaches a target value.

10. The air-conditioning system of claim 1 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

11. The air-conditioning system of claim 1 , wherein
the refrigerant circuit includes an accumulator connected to an intermediate portion of a low-pressure gas pipe of the refrigerant circuit, and the accumulator serves as the refrigerant container.

12. The air-conditioning system of claim 2 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

13. The air-conditioning system of claim 3 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

14. The air-conditioning system of claim 4 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

15. The air-conditioning system of claim 5 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

16. The air-conditioning system of claim 6 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

17. The air-conditioning system of claim 7 , wherein
the refrigerant circuit includes a receiver connected to an intermediate portion of a high-pressure liquid pipe of the refrigerant circuit, and the receiver serves as the refrigerant container.

18. The air-conditioning system of claim 2 , wherein
the refrigerant circuit includes an accumulator connected to an intermediate portion of a low-pressure gas pipe of the refrigerant circuit, and the accumulator serves as the refrigerant container.

19. The air-conditioning system of claim 3 , wherein
the refrigerant circuit includes an accumulator connected to an intermediate portion of a low-pressure gas pipe of the refrigerant circuit, and the accumulator serves as the refrigerant container.

20. The air-conditioning system of claim 4 , wherein
the refrigerant circuit includes an accumulator connected to an intermediate portion of a low-pressure gas pipe of the refrigerant circuit, and the accumulator serves as the refrigerant container.

Assignees

• Daikin Ind Ltd

Inventors

• Ukibune Masanori
• Yasuo Kouichi
• Ohno Masao

Classifications

• F25B2313/02732

  using two three-way valves · CPC title

• F25B2313/0231

  with simultaneous cooling and heating · CPC title

• F24F1/0068 Primary

  characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing · CPC title

• F25B43/00

  Arrangements for separating or purifying gases or liquids (in analysers or rectifiers F25B33/00); Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat (F25B40/00 takes precedence) · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title