Evaluation of defrost options for secondary coolants in multi-temperature indirect transport refrigeration part I: experimental results

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Title: Evaluation of defrost options for secondary coolants in multi-temperature indirect transport refrigeration part I: experimental results
Authors: Finn, Donal
Cabello-Portoles, Andreas
Smyth, Shane
Brophy, B.
Permanent link: http://hdl.handle.net/10197/4690
Date: 2008
Abstract: This paper examines defrost performance issues associated with a finned-tube air chiller, utilised as a heat exchanger in an indirect multi-temperature transport refrigeration system, where a glycol antifreeze mixture is deployed as a secondary working fluid. Two approaches to defrost are examined: a direct electric defrost mode which effects defrost by localised resistance heating of the secondary working fluid; and a hot gas primary circuit, that indirectly heats the secondary working fluid by means of a primary to secondary heat exchanger. Investigation into the different defrost modes were carried out for chamber set point conditions of -20, -12, 0oC, for a number of defrost rated inputs between 0.5 and 3.9 kW. For a unit mass of frost, the duration of defrost was found to be inversely proportional to defrost energy input, however this relation was found to be non-linear. Defrost efficiency was found to decrease with defrost energy input, whereas the required specific total energy for defrost was found to increase with defrost energy input.
Type of material: Conference Publication
Publisher: The International Institute of Refrigeration
Copyright (published version): 2008 the authors
Keywords: Defrost;Secondary coolants;Multi-temperature indirect transport refrigeration
Language: en
Status of Item: Not peer reviewed
Conference Details: 8th IIR Gustav Lorentzen Conference on Natural Working Fluids, Copenhagen, 2008
Appears in Collections:Mechanical & Materials Engineering Research Collection

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