Development of a direct contact heat exchanger using phase change materials

Allwood, Andrew (2002). Development of a direct contact heat exchanger using phase change materials Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Allwood, Andrew
Thesis Title Development of a direct contact heat exchanger using phase change materials
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2002
Thesis type Honours Thesis
Supervisor Dr Michael Wendt
Total pages 74
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract

This thesis investigates a Direct Contact Heat Exchanger using Phase Change Materials. In the experiments, room temperature air is bubbled through hot paraffin wax. The wax is observed as it cools and solidifies, with the phase change region of particular interest. Measurements are made of temperature, pressure and flowrates, and this data is used as the basis for the analysis of the heat exchanger. The two primary elements analysed are the heat transfer and the pressure drop. The temperature efficiency is determined, and the energy efficiency is explained qualitively. Whilst the wax is liquid, the pressure drop was observed to be very small, and weakly related to the airflow rate. The pressure drop dramatically increases during phase change. A phase change material mixture, or slurry, is proposed to avoid the problems that we observed in the results and found in the analysis. Areas for future work are then outlined.

Keyword Direct contact heat exchanger
Phase change materials
Temperature efficiency
Additional Notes * Mechanical engineering undergraduate theses. Sem 2, 2002

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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