Numerical simulation to optimize the design of double glazed doors for closed refrigerated vertical display cabinets

Paper


Mossad, Ruth. 2006. "Numerical simulation to optimize the design of double glazed doors for closed refrigerated vertical display cabinets." de Vahl Davis, Graham and Leonardie, Eddie (ed.) 13th International Heat Transfer Conference IHTC-13. Sydney, Australia 13 - 18 Aug 2006 Redding, CT, USA.
Paper/Presentation Title

Numerical simulation to optimize the design of double glazed doors for closed refrigerated vertical display cabinets

Presentation TypePaper
Authors
AuthorMossad, Ruth
Editorsde Vahl Davis, Graham and Leonardie, Eddie
Journal or Proceedings TitleAnnals of the Assembly for International Heat Transfer Conference 13: Proceeding of the 13th International Heat Transfer Conference IHTC-13
Journal Citation13
Number of Pages11
Year2006
Place of PublicationRedding, CT, USA
ISBN1567002269
Web Address (URL) of Paperhttp://www.begellhouse.com/journals/IHTC13,27848c3122dc0c30,12b1179f2a1b6cdc.html
Conference/Event13th International Heat Transfer Conference IHTC-13
Event Details
13th International Heat Transfer Conference IHTC-13
Event Date
13 to end of 18 Aug 2006
Event Location
Sydney, Australia
Abstract

Due to the great awareness of global warming, energy savings should be on the mind of all design engineers. Saving energy in refrigerated vertical display cabinets, which is a major supermarket appliance, is of great importance to users and manufacturers. The aim of this paper is to investigate how to minimize energy usage of refrigerated vertical display cabinets by optimizing the design of its double glazed door. Choosing the gap width can be crucial for optimizing the refrigerator efficiency.

The computational fluid dynamics software ‘Fluent’ is used to predict the heat gain through the double glazed door by solving a steady 2-D model for the natural convection in the air gap including heat transfer due to radiation. The air gap investigated is 1.5m high and assumed to have different width 5, 10, 15, 17, 20, 25, 30 & 35 mm which gives aspect ratios in the range 300–43. Results show that as the gap size increases (i.e. aspect ratio decreases) the heat gain due to natural convection decreases up to a limit and then reaches almost a constant value while the radiation heat transfer shows an opposite trend. However, the total heat transfer gain decreases until it reaches a constant value. These results suggest that increasing the gap width improves the door’s efficiency; but only up to a certain limit after which the increase in the gap width does not affect the heat transfer anymore. Results also show that at the small gap width (i.e. high aspect ratio), heat transfer due to convection and radiation is almost equal and as the gap width increases, the radiation component starts to have more dominance. This suggests that the use of a type of glass with lower emittance properties may enhance the thermal effectiveness of the door.

Keywordsnumerical modelling, double glazed doors, display cabinets, CFD
ANZSRC Field of Research 2020401205. Experimental methods in fluid flow, heat and mass transfer
401706. Numerical modelling and mechanical characterisation
Byline AffiliationsDepartment of Mechanical and Mechatronic Engineering
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