Advances in Fixed-Area Expansion Devices

Fang, X.

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https://hdl.handle.net/2142/13327 Copy

Description

Title

Advances in Fixed-Area Expansion Devices

Author(s)

Fang, X.

Issue Date

1999-08

Keyword(s)

fixed-area expansion devices

Abstract

Fixed-area expansion devices are widely used in refrigerators, air-conditioners, and heat pumps of up to 3.5 kW capacity with variable operating conditions. A fixed-area expansion device falls into one of the three categories: an orifice, a short tube, and a capillary tube. The earliest studies on orifices began in 1900s, with the interest in metering fluid flow rate. The research on capillary tubes began to be active in 1940s. Since then, the study of fixed-area expansion devices has been one of main activities in refrigerating. With the increasing need to replace the ozone-depleting CFC and HCFC refrigerants, refrigerators, air-conditioners, and heat pump systems have to be redesigned to accommodate new replacement refrigerants so that research activities in fixed-area expansion devices have been intensified since early 1980s. This paper gives a detailed review of the literature on fixed-area expansion devices. The main topics include the mass flow rate through orifices, the mass flow rate through short tubes, rating capillary tubes, metastable flow, the friction factor and friction pressure drop, and mathematical solution of fixed-area expansion device.

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center CR-20

Type of Resource

text

Language

en

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http://hdl.handle.net/2142/13327

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