Cycling and Quasi-Steady Behavior of a Refrigerator

Krause, P.E.; Bullard, C.W.

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https://hdl.handle.net/2142/10738 Copy

Description

Title

Cycling and Quasi-Steady Behavior of a Refrigerator

Author(s)

• Krause, P.E.
• Bullard, C.W.

Issue Date

1994-07

Keyword(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.

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-58

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/10738

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Center Project 30

Owning Collections