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Heat Transfer Efficiency and Capital Cost Evaluation of a Three-Phase Direct Contact Heat Exchanger for the Utilisation of Low-Grade Energy Sources

Mahood, HB, Campbell, AN, Thorpe, RB and Sharif, AO (2015) Heat Transfer Efficiency and Capital Cost Evaluation of a Three-Phase Direct Contact Heat Exchanger for the Utilisation of Low-Grade Energy Sources Energy Conversion and Management, 106. pp. 101-109.

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Abstract

Low-grade energy cycles for power generation require efficient heat transfer equipment. Using a three-phase direct contact heat exchanger instead of a surface type exchanger, such as a shell and tube heat exchanger, potentially makes the process more efficient and economic. This is because of its ability to work with a very low temperature driving force, as well as its low cost of construction. In this study, an experimental investigation of the heat transfer efficiency, and hence cost, of a three-phase direct contact condenser has been carried out utilising a short Perspex tube of 70 cm total height and 4 cm internal diameter. Only 48 cm was used for the direct contact condensation. Pentane vapour with three different initial temperatures (40℃, 43.5℃ and 47.5℃) was contacted with water with an inlet temperature of 19℃. In line with previous studies, the ratio of the fluid flow rates was shown to have a controlling effect on the exchanger. Specifically, the heat transfer efficiency increased virtually linearly with this ratio, with higher efficiencies also being observed with higher flow 2 rates of the continuous phase. The effect of the initial temperature of the dispersed phase was shown to have a lower order impact than flow rate ratio. The capital cost of the direct contact condenser was estimated and it was found to be less than the corresponding surface condenser (shell and tube condenser) by 30 times. An optimum value of the continuous phase flow rate was observed at which the cost of the condenser is at a minimum. Keywords: Three-phase direct contact condenser, heat transfer efficiency, costing

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
AuthorsEmailORCID
Mahood, HBUNSPECIFIEDUNSPECIFIED
Campbell, ANUNSPECIFIEDUNSPECIFIED
Thorpe, RBUNSPECIFIEDUNSPECIFIED
Sharif, AOUNSPECIFIEDUNSPECIFIED
Date : December 2015
Identification Number : 10.1016/j.enconman.2015.09.023
Additional Information : © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Symplectic Elements
Date Deposited : 06 Oct 2015 09:41
Last Modified : 01 Dec 2016 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/808573

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