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Proceedings of Symposium on Energy Engineering in the 21<sup>st</sup> Century (SEE2000) Volume I-IV

ISSN:
1-56700-132-7 (Print)

TEMPERATURE CONTROL IN REFRIGERATED TRANSPORT WITH A SNOW BAG

W. Reinaldo Da Veiga
Department of Mechanical and Manufacturing Engineering, Rand Afrikaans University, PO Box 524, Auckland Park, 2006, Johannesburg, South Africa

Josua Petrus Meyer
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, Private Bag X20, Hatfield, 0028, South Africa

Abstract

Snow shooting is a recently patented process that is used in refrigerated transport. Pressurised liquid carbon dioxide is injected via a "snow" lance into a permeable snow bag mounted near the ceiling of the insulated container. The decrease in pressure causes the liquid carbon dioxide to convert to "snow" and vapour inside the snow bag. It is the purpose of the paper to develop a model that can be used to predict the heat transfer and more specifically the heat transfer coefficient of a snow bag. This model could then be used to predict the amount of snow and/or size of the snow bag for a given size of body and heat load. This is done with experimental and theoretical energy balances over the container walls and the snow bag.