Characteristics of air flow and heat transfer in serpentine condenser pipes with attached convection plates in open channel

Edy Susanto, M. Idrus Alhamid, Nasruddin, Budihardjo, Prabowo, Sentot Novianto

Research output: Contribution to journalArticlepeer-review

Abstract

Many efforts have been made to reduce the energy consumption of household refrigerators. One method is to place the pipe condenser to increase the rate of heat release. This numerical study examines the effect of changing the gap ratio on the flow characteristics and natural convection heat transfer of 20 pipes attached vertically to the convection plate with aluminum foil coating. The gap ratio was varied between 1.05 and 4.20 using ANSYS-FLUENT software to obtain velocity vector, temperature contour, tangential velocity, and local Nusselt number, both inside and outside the channel. With the change in gap ratios from 1.05 to 2.10, the rate of heat transfer increased significantly, reaching 2.2% while tangential velocity also increased considerably. At gap ratios of 3.15 and 4.20, the rate of heat transfer increased more gradually, local Nusselt number increased slightly where the influence of convection walls was smaller, and tangential velocity showed a very small increase. Flow characteristics were similar, with air flowing upward across the inner and outer channels.

Original languageEnglish
Pages (from-to)564-573
Number of pages10
JournalInternational Journal of Technology
Volume11
Issue number3
DOIs
Publication statusPublished - 21 Jul 2020

Keywords

  • Gap ratio
  • Household refrigerator
  • Natural convection
  • Nusselt number
  • Vertical channel

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