Air-cooled heat exchanger modelling

David, Chamberlain (2011). Air-cooled heat exchanger modelling B.Sc Thesis, School of Engineering, The University of Queensland.

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Author David, Chamberlain
Thesis Title Air-cooled heat exchanger modelling
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2011
Thesis type B.Sc Thesis
Supervisor Hal Gurgenci
Kamel Hooman
Total pages 69
Language eng
Subjects 091405 Mining Engineering
0913 Mechanical Engineering
Formatted abstract
The aim of this investigation is to validate a porous media formulation (PMF) proposed by Gurgenci and Hooman (2010) and determine if this method of heat exchanger performance analysis can be used for a variety of air-cooled heat exchanger applications. The porous media formulation uses the porosity of the heat exchanger to predict the normalized heat transfer coefficient and air side pressure drop.

A review of past literature was conducted and design cases to represent different applications were developed. The design cases were then be applied to both the past literature and porous media formulation. The resulting heat transfer coefficients and air side pressure drops show how the porous media formulation compares to past methods of modelling heat exchanger performance.

The limits of each correlation including the porous media formulation were found to be important when assessing the results. Many of the correlations were used with data beyond their recommended limits however results appeared reasonable in most cases. The porous media results showed the porous media formulation cannot be used beyond its limits as the functions don.t continue to represent appropriate results. The porous media formulation appears to be acceptable for all applications considered if the data is within its limits.

This investigation concludes that the porous media formulation would be acceptable for use as a preliminary design tool as it predicts the heat transfer coefficient and pressure drop within the range of the correlation results in most cases. The porous media formulation may also be useful where correlations don.t exist for a particular design and the porosity is within the limits of the formulation. Where possible, the relative correlation should be used to obtain more accurate estimates of the heat transfer coefficient and air side pressure drop during detailed design. In most cases the porous media formulation is seen to produce an over estimate of the heat transfer coefficient, however the pressure drop is unpredictable.

Further investigation could be conducted using experimental data from air-cooled heat exchangers to verify the results of this investigation. Spread sheets developed during this investigation would allow many more data sets to be added with ease. Therefore, a greater range of data could be added for further investigations.
Keyword Heat exchanger modelling

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Fri, 12 Sep 2014, 09:55:58 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service