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Evaluation of defrost options for secondary coolants in multi-temperature indirect transport refrigeration part I: experimental results
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| Finn IIR Copenhagen done.pdf | 560.3 kB | Adobe PDF | Download |
| 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| Defrost;Secondary coolants;Multi-temperature indirect transport refrigeration | Language: | en | Status of Item: | Not peer reviewed | Conference Details: | 8th IIR Gustav Lorentzen Conference on Natural Working Fluids, Copenhagen, 2008 |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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