Simulation of a wet-surface bare rod heat exchanger

Abdul Raheem Shaik, Ali Al-Alili, Saeed M. Alhassan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, a CFD analysis is carried out in ANSYS Fluent to investigate the enhancement of heat transfer and vapor condensation rate in a novel air-to-solid micro bare rod heat exchanger. Literature indicates that the enhancement of heat transfer occurs at the cost of increasing pressure drop across the heat exchanger; due to proximity of the rods. The heat exchanger is first modeled in Engineering Equation Solver (EES) to perform under Abu Dhabi's hot and humid climate conditions. The heat exchanger is modelled to operate at low Reynolds number to increase the air residue time and allow condensation to occur. In the model, copper rods of diameter 1 mm are evenly spaced out between 2 plates to form the heat exchanger. Fixing the space occupied by the heat exchanger, i.e. volume occupied, the diameter of the copper rods is varied from 0.5 to 5 mm. The effect of the copper rods' diameter and the spacing between the rods on the rate of vapor condensation, heat transfer, and pressure drop are investigated. Correlations for a micro bare rod heat exchanger exposed to a humid air stream are not available in the literature. Thus, using CFD modeling, the j (dry and wet side) and f factor correlations are determined for this novel heat exchanger operating at low Reynolds numbers. Lastly, the performance of the novel heat exchanger is compared to a fintube heat exchanger occupying the same volumetric space operating at the same conditions.

Original languageBritish English
Title of host publicationProceedings of the ASME 2021 15th International Conference on Energy Sustainability, ES 2021
ISBN (Electronic)9780791884881
DOIs
StatePublished - 2021
EventASME 2021 15th International Conference on Energy Sustainability, ES 2021 - Virtual, Online
Duration: 16 Jun 202118 Jun 2021

Publication series

NameProceedings of the ASME 2021 15th International Conference on Energy Sustainability, ES 2021

Conference

ConferenceASME 2021 15th International Conference on Energy Sustainability, ES 2021
CityVirtual, Online
Period16/06/2118/06/21

Keywords

  • ANSYS fluent
  • Bare rod heat exchanger
  • Condensation
  • Moist air

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