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Cycling and Quasi-Steady Behavior of a Refrigerator

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PDF TR058.pdf (887KB) ACRC Technical Report 58 PDF
Title: Cycling and Quasi-Steady Behavior of a Refrigerator
Author(s): Krause, P.E.; Bullard, C.W.
Subject(s): cycling performance
Abstract: The cycling losses of a domestic refrigerator-freezer are quantified to gain a better understanding of the adjustments needed to enable a steady-state refrigerator model to be used to design for cycling operation. A refrigerator with a capillary tube/suction line heat exchanger and a rotary compressor was instrumented extensively for these experiments. Refrigerant migration during the off-cycle was found to increase the cabinet heat load by 2 to 6%, with the greater percentage increase occurring at lower ambient temperatures. Compared to a quasi-steady machine, the efficiency is degraded by 3 to 5% during the on-cycle due to power and capacity losses. The capacity loss, ranging from 3.9 to 5.6%, plays a greater role in the efficiency loss than the power penalty, 0 to 1.5%. During the first minute of the on-cycle, when the refrigerant is being redistributed from the evaporator to the oil sump, 2 to 3.3% of the capacity is lost and the power demand may increase by as much as 1.7%. After the first minute of the on-cycle, while some refrigerant is being redistributed back into the evaporator, there is a 0.8 to 3.0% capacity loss and a negligible power penalty.
Issue Date: 1994-07
Publisher: Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report: Air Conditioning and Refrigeration Center TR-58
Genre: Technical Report
Type: Text
Language: English
Sponsor: Air Conditioning and Refrigeration Center Project 30
Date Available in IDEALS: 2009-04-06

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