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Air cycle system with variable mix recuperator

Inactive Publication Date: 2007-04-19
IMPERIAL RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such land-based open air cycle systems are more inefficient during their initial starting phase than when operating at steady state conditions, resulting in higher power requirements of the system during the startup.
Therefore, for most of these systems, the power units are sized for the work required in the startup phase and are not optimized for steady state operations, even though the systems are run in steady state conditions most of the time.

Method used

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  • Air cycle system with variable mix recuperator
  • Air cycle system with variable mix recuperator
  • Air cycle system with variable mix recuperator

Examples

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Embodiment Construction

[0012] Referring to the accompanying drawings in which like reference numbers indicate like elements, FIG. 1 illustrates an air cycle system 10 that provides a conditioned airflow 12 to a compartment 14 from an air cycle machine 16. The air cycle machine 16 includes a compressor 18, a pair of heat exchangers 20, 22, an expander 24, and a bypass system 26. The airflow travels between these components via corresponding ducts 28. The heat exchanger 20 immediately downstream of the compressor 18 preferably includes a fan 30 that blows ambient air 32 over the ambient heat exchanger 20 to cool the airflow that has increased in temperature due to the compression of the air. The other heat exchanger 22 is regenerative because the expanded airflow 12″ directed through the bypass system 26 is used to further cool the compressed airflow 12′ prior to entering the expander 24. Additionally, a water separator 34 is preferably situated between the expander 24 and the regenerative heat exchanger 22...

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PUM

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Abstract

An open air cycle machine includes a compressor, a pair of heat exchangers, an expander, and a bypass system that can selectively recirculate the expanded, cooled airflow prior to entering the compartment being cooled. One of the heat exchangers is regenerative, and the bypass system directs the expanded airflow through the regenerative heat exchanger to further cool the compressed airflow prior to entering the expander. The bypass system includes a bypass duct and a mixer, and the mixer has a valve and a controller.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] None. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an open air cycle cooling system and more particularly, to an air cycle machine with a pair of heat exchangers and a bypass system which recirculates the expanded airflow through the second heat exchanger. [0004] 2. Related Art [0005] It is generally known that an air cycle machine can be used in cooling and refrigeration systems, such as taught by U.S. Pat. No. 6,622,499. It is also known that, for air cycle machines that recirculate the expanded, cooled airflow, such air cycle machines may also include a recuperative heat exchanger in addition to the primary heat exchanger, such as taught by U.S. Pat. Nos. 4,295,518, 6,381,973 and 6,672,081. Typically, a regenerative heat exchanger, or recuperator, is positioned upstream of the expander to use the expanded airflow further reduce the temperature of the compressed airflow before it...

Claims

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Application Information

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IPC IPC(8): F25B9/00F28B9/00F25D9/00
CPCF25B9/004F28D17/00
Inventor HEIZER, CHARLES K.
Owner IMPERIAL RES