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ACRC Technical Report 249PDF


Title:Designing Systems to Use Simpler Expansion Devices
Author(s):Bullard, C.W.; Davidson, I.E.
Subject(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.
Issue Date:2006-09
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-249
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 180
Date Available in IDEALS:2009-06-24

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