AIR CONDITIONING SYSTEM

• US 20090288437A1
• Filed: 07/20/2007
• Published: 11/26/2009
• Est. Priority Date: 07/24/2006
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Kurihara, Toshiyuki, Matsuoka, Hiromune
• Granted Patent: US 8,156,752 B2
• Time in Patent Office: Days
• US Class Current: 62/238.600
• CPC Class Codes: F24F 2221/54 Heating and cooling, simultaneously or alternatively
• CPC Class Codes: F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
• CPC Class Codes: F24F 5/0017 using cold storage bodies, e.g. ice
• CPC Class Codes: F24F 5/0096 combined with domestic apparatus
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2309/061 with cycle highest pressure above the supercritical pressure
• CPC Class Codes: F25B 2313/0252 with bypasses
• CPC Class Codes: F25B 2313/0254 in series arrangements
• CPC Class Codes: F25B 2313/02741 using one four-way valve
• CPC Class Codes: F25B 25/005 using primary and secondary systems
• CPC Class Codes: F25B 9/008 the refrigerant being carbon dioxide
• CPC Class Codes: Y02E 60/14 Thermal energy storage

Abstract

An air conditioning system includes a compressor, a first heat source-side heat exchanger for heating or cooling a refrigerant, a second heat source-side heat exchanger for exchanging heat between the refrigerant and a heat delivery medium, a first utilization-side heat exchanger for performing indoor cooling by using the refrigerant cooled in the first heat source-side heat exchanger, a second utilization-side heat exchanger for performing indoor heating by using the heat delivery medium subjected to heat exchange in the second heat source-side heat exchanger, and a connection mechanism. The connection mechanism can switch between a first connection state in which refrigerant is circulated sequentially through the compressor, the first heat source-side heat exchanger, the first utilization-side heat exchanger and the compressor; and a second connection state in which the refrigerant is circulated sequentially through the compressor, the second heat source-side heat exchanger, the first heat source-side heat exchanger, and the compressor.

Claims

1. An air conditioning system being configured to switch between indoor heating and cooling, the air conditioning system comprising:

a compressor being configured to compress a refrigerant to critical pressure or greater;

a first heat source-side heat exchanger being configured to heat or to cool the refrigerant;

a second heat source-side heat exchanger being configured to exchange heat between the refrigerant and a heat delivery medium;

a first utilization-side heat exchanger being configured to perform indoor cooling by using the refrigerant cooled in the first heat source-side heat exchanger;

a second utilization-side heat exchanger being configured to perform indoor heating by using the heat delivery medium subjected to heat exchange in the second heat source-side heat exchanger; and

a connection mechanism being configured to switch between a first connection state in which the refrigerant discharged from the compressor is circulated sequentially through the first heat source-side heat exchanger, the first utilization-side heat exchanger, and the compressor, and a second connection state in which the refrigerant discharged from the compressor is circulated sequentially through the second heat source-side heat exchanger, the first heat source-side heat exchanger, and the compressor,

the compressor, the first heat source-side heat exchanger, the second heat source-side heat exchanger, and the connection mechanism constituting a heat source unit,

the first utilization-side heat exchanger constituting a utilization unit, and

the utilization unit and heat source unit being connected via refrigerant communication pipes.

2. The air conditioning system as recited in claim 1, wherein

the connection mechanism has a first connection mechanism and a second connection mechanism,

the first connection mechanism is configured to switch between a first switching state in which the discharge side of the compressor and one end of the first heat source-side heat exchanger are connected and the intake side of the compressor and one end of the first utilization-side heat exchanger are connected in the first connection state, and a second switching state in which the discharge side of the compressor and one end of the second heat source-side heat exchanger are connected and the intake side of the compressor and the one end of the first heat source-side heat exchanger are connected in the second connection state, and

the second connection mechanism is configured to switch between a first pressure reduction state in which the refrigerant cooled in the first heat source-side heat exchanger is reduced in pressure and sent to the first utilization-side heat exchanger in the first connection state, and a second pressure reduction state in which the refrigerant subjected to heat exchange in the second heat source-side heat exchanger is reduced in pressure and sent to the first heat source-side heat exchanger in the second connection state.

3. The air conditioning system as recited in claim 2, wherein

the first connection mechanism is configured to switch to the first switching state and the second connection mechanism is configured to switch to a third pressure reduction state in which the refrigerant cooled in the first heat source-side heat exchanger is reduced in pressure and sent to the first utilization-side heat exchanger, and in which the refrigerant subjected to heat exchange in the second heat source-side heat exchanger is reduced in pressure and sent to the first heat source-side heat exchanger.

4. The air conditioning system as recited in claim 3, wherein the heat delivery medium is water.

5. The air conditioning system as recited in claim 4, wherein the refrigerant is carbon dioxide.

6. The air conditioning system as recited in claim 3, wherein the refrigerant is carbon dioxide.

7. The air conditioning system as recited in claim 2, wherein the heat delivery medium is water.

8. The air conditioning system as recited in claim 7, wherein the refrigerant is carbon dioxide.

9. The air conditioning system as recited in claim 2, wherein the refrigerant is carbon dioxide.

10. The air conditioning system as recited in claim 1, wherein the heat delivery medium is water.

11. The air conditioning system as recited in claim 10, wherein the refrigerant is carbon dioxide.

12. The air conditioning system as recited in claim 1, wherein the refrigerant is carbon dioxide.