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Air conditioner

An air-conditioning device and control device technology, which is applied to air-conditioning systems, space heating and ventilation, and control input involving air characteristics, etc. Solve the insufficiency of ability and avoid the effect of persistent insufficiency for a long time

Active Publication Date: 2011-05-04
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in an air conditioner using a supercritical refrigerant, when heating, sometimes the room temperature does not reach the set temperature even though the refrigerant outlet temperature of the radiator has reached the target value, and in Patent Document 1 there is no Publicize the solution to the problem

Method used

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Examples

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Embodiment Construction

[0049]

[0050] figure 1 It is a block diagram of the air conditioner which concerns on embodiment of this invention. The air conditioner 1 uses CO 2 whose high pressure side is equal to or higher than the critical pressure as a refrigerant.

[0051] The air conditioner 1 is a multi-connected air conditioner for a building. Multiple indoor units 3 are connected in parallel to one or more outdoor units 2. In order to allow the refrigerant to circulate, a compressor 11, a four-way switching valve 12, an outdoor heat exchanger, etc. An exchanger 13 , an outdoor expansion valve 14 and an indoor expansion valve 15 serving as an expansion mechanism, and an indoor heat exchanger 16 are connected to form a refrigerant circuit 10 . The indoor fan 22 introduces indoor air into the indoor heat exchanger 16 .

[0052] In addition, an outlet temperature sensor 41 is provided on the piping on the refrigerant outlet side (during heating) of the indoor heat exchanger 16 , and a room tempe...

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Abstract

An air conditioner capable of always exhibiting necessary heating capacity by using a supercritical coolant. In a heating mode, the air conditioner (1) allows an indoor heat exchanger (16) to dissipate heat from the supercritical coolant to the air. A control unit (4) maintains the high-pressure side pressure of the cooling cycle including the indoor heat exchanger (16) constantly. The controller(4) allows an outlet temperature sensor (41) to detect the coolant outlet temperature Tgc of the indoor heat exchanger (16) and a room temperature sensor (42) to detect the room temperature Ta. The controller (4) increases / decreases the target value of the high-pressure side pressure when it judges that the capacity is insufficient in view of the room temperature Ta of the room to be heated even if the coolant outlet temperature Tgc of the indoor heat exchanger (16) in the heating mode reaches the target value Tgcs.

Description

technical field [0001] The present invention relates to an air conditioning unit using a refrigerant operating at supercritical pressure on the high pressure side. Background technique [0002] From the viewpoint of protecting the global environment and improving efficiency, the use of supercritical refrigerants operating at supercritical pressure on the high pressure side as refrigerants for air conditioners has been studied (for example, refer to Patent Document 1). The device described in Patent Document 1 uses CO2 refrigerant, and controls the high-pressure pressure within a range in which the coefficient of performance COP is near the maximum according to the value of the refrigerant outlet temperature of the radiator, thereby performing operation with a high coefficient of performance COP. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2002-130770 [0004] However, in an air conditioner using a supercritical refrigerant, when heating, sometimes the room tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/02
CPCF24F3/065F25B9/008F25B13/00F25B49/027F25B2309/061F25B2313/0233F25B2313/02741F25B2313/0314F25B2600/17F25B2700/2104F24F11/30F24F2110/10F24F2140/12F24F2140/20F24F11/84F24F11/61F24F11/46F24F11/63F24F11/86F24F11/62
Inventor 冈本哲也笠原伸一
Owner DAIKIN IND LTD
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