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Use of an adjustable expansion vavle to control dehumidification

a technology of expansion valve and expansion valve, which is applied in the direction of refrigeration components, lighting and heating apparatus, heating types, etc., can solve the problem that the superheat of the evaporator cannot be controlled to control the dehumidification of the air being delivered, and achieve the effect of reducing the cooling load

Inactive Publication Date: 2010-09-30
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]In a disclosed embodiment of this invention, a control for an electronic expansion valve (EXV) achieves a desired refrigerant superheat at the evaporator exit such that the dehumidification provided by the refrigerant system to the air delivered into a conditioned environment can be controlled. In one embodiment, the “dehumidification” mode of superheat control is only entered if a reduced cooling load p

Problems solved by technology

Control of the evaporator superheat has been provided for a variety of functions, however, the evaporator superheat has not been controlled to control dehumidification of the air being delivered into an environment to be conditioned.

Method used

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  • Use of an adjustable expansion vavle to control dehumidification
  • Use of an adjustable expansion vavle to control dehumidification

Examples

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Embodiment Construction

[0009]FIG. 1 shows a refrigerant system 20 incorporating a compressor 22 for compressing a refrigerant and delivering it downstream to a heat rejection heat exchanger 24. From the heat rejection heat exchanger 24, the refrigerant passes through an electronic expansion valve 26, and then to an evaporator 30. As shown, air moving over the evaporator 30 is delivered into an environment to be conditioned 32. The environment to be conditioned 32 is provided with a control 43 that allows an occupant to select desired temperature and / or humidity levels to be provided by the air being delivered into the environment.

[0010]A control 28 is shown for the electronic expansion device 26. Moreover, transducers or other sensors 34 and 36 are shown in various locations within the refrigerant system 20. As shown, a transducer 34 is provided downstream of the compressor and may sense the pressure and / or temperature at the discharge of the compressor 22. Similarly, a sensor 36 may sense the pressure an...

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PUM

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Abstract

A refrigerant system is provided with a control for its expansion device. The control operates the expansion device to adjust the superheat of the refrigerant leaving an evaporator to have desired dehumidification for air being delivered into an environment to be conditioned.

Description

BACKGROUND OF THE INVENTION[0001]This application relates to a refrigerant system incorporating an adjustable expansion valve, and more particularly, to a refrigerant system wherein this adjustable expansion valve is controlled to achieve desired dehumidification within a climate-controlled environment. A typical example of such an adjustable expansion device is an electronic expansion valve.[0002]Refrigerant systems are known in the HVAC&R (heating, ventilation, air conditioning and refrigeration) art, and operate to compress and circulate a refrigerant throughout a closed-loop refrigerant circuit, connecting a plurality of components, to condition a secondary fluid to be delivered to a climate-controlled space. In a basic refrigerant system, refrigerant is compressed in a compressor from a lower to a higher pressure and delivered to a heat rejection heat exchanger (condenser or gas cooler). From the heat rejection heat exchanger, where heat is typically transferred from the refrig...

Claims

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Application Information

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IPC IPC(8): F25B1/00F25B41/00F25B41/04
CPCF24F3/1405F25B41/062F25B2700/21152F25B2600/2513F25B2700/1931F25B2600/21F25B41/34Y02B30/70
Inventor LIFSON, ALEXANDERTARAS, MICHAEL F.
Owner CARRIER CORP