Designing Systems to Use Simpler Expansion Devices

Bullard, C.W.; Davidson, I.E.

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https://hdl.handle.net/2142/12909 Copy

Description

Title

Designing Systems to Use Simpler Expansion Devices

Author(s)

• Bullard, C.W.
• Davidson, I.E.

Issue Date

2006-09

Keyword(s)

expansion devices

Abstract

This report analyzes a broad spectrum of strategies for actively or passively controlling the inlet state of fixed-geometry expansion devices such as capillary and orifice tubes, to match compressor mass flow rates with minimal performance degradation in an efficient R410A a/c system. A TXV system was selected as the baseline for an exhaustive series of design options, including from heat exchanger sizing to use of receivers, internal heat exchangers, bladder accumulator and simple air flow modulation. Results yielded insights that can be generalized to other refrigerants and systems. Orifice tubes were found to produce higher efficiency than capillary tubes across the entire range of operating conditions, although the difference can be mitigated by proper choice of the latter’s length and diameter. Only one configuration appears to be capable of matching TXV system performance across a wide range of operating conditions: a short tube orifice with low side receiver and internal heat exchanger.

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 TR-249

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/12909

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Project 180

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