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Thermal performance of skin-type, hot-wall condensers, Part II: Design guidelines for household applications.

Author(s) : ESPINDOLA R. S., KNABBEN F. T., MELO C., et al.

Type of article: Article, IJR article

Summary

This work presents a numerical and experimental approach focused on design guidelines for hot-wall condensers applied to domestic refrigerators. To this end, seven refrigerators were manufactured with distinct condenser designs. The design parameters were the following: (i) adhesive tape (aluminum or polyethylene), (ii) tube outer diameter (4 or 4.76 mm), (iii) total length (10 or 11.5 m) and (iv) lay-out. An in-house mathematical model for hot-wall condensers was added to an in-house system simulation tool to predict the refrigerators performance. Experiments were conducted in a climate-controlled test chamber. It was found that the model predictions are close to the energy consumption measurements with deviations of the order of ±10%. It has also been found that the heat load is increased on average by 7.7% when a hot-wall condenser is added to the system. An extensive sensitivity analysis was also put forward, showing that the hot-wall condenser and thus the refrigerator performance is very much affected by the outer sheet thermal conductivity and thickness, but mainly by the tape thermal conduc- tivity. The contact area between tube and outer sheet also plays a significant role in the heat transfer, meaning that a cheaper polymeric tape could be used if enough contact area is provided. Additionally, it has been found that there is a tube pitch which minimizes the energy consumption in despite of the condenser geometry.

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Pages: 262-267

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Details

  • Original title: Thermal performance of skin-type, hot-wall condensers, Part II: Design guidelines for household applications.
  • Record ID : 30027303
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 110
  • Publication date: 2020/02
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2019.11.011

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