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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/26616

Title: Optimal passage size for solar collector microchannel and tube-on-plate absorbers
Authors: Moss, Roger
Shire, Stan
Henshall, Paul
Eames, Philip C.
Arya, Farid
Hyde, Trevor
Keywords: Solar collector
Solar absorber
Single pass
Double pass
Thermal
Flat panel
Heat transfer
Laminar
Turbulent
Microchannel
Serpentine
Pressure drop
Pumping power
Optimisation
Issue Date: 2017
Publisher: © The Authors. Published by Elsevier
Citation: MOSS, R. ...et al., 2017. Optimal passage size for solar collector microchannel and tube-on-plate absorbers. Solar Energy, 153, pp. 718-731.
Abstract: © 2017 The Authors Solar thermal collectors for buildings use a heat transfer fluid passing through heat exchange channels in the absorber. Flat plate absorbers may pass the fluid through a tube bonded to a thermally conducting plate or achieve lower thermal resistance and pressure drop by using a flooded panel or microchannel design. The pressure drop should be low to minimise power input to the circulating pump. A method is presented for choosing the optimum channel hydraulic diameter subject to geometric similarity and pumping power constraints; this is an important preliminary design choice for any solar collector designer. The choice of pumping power is also illustrated in terms of relative energy source costs. Both microchannel and serpentine tube systems have an optimum passage diameter, albeit for different reasons. Double-pass and flooded panel designs are considered as special microchannel cases. To maintain efficiency, the pumping power per unit area must rise as the passage length increases. Beyond the optimum pumping power the rise in operating cost outweighs the increase in collector efficiency.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: The authors are grateful to the Engineering and Physical Sciences Research Council (EPSRC) for funding this work as part of a collaborative programme between Warwick, Loughborough and Ulster universities, reference P/K009915/1, EP/K010107/1 and EP/K009230/1.
Version: Published
DOI: 10.1016/j.solener.2017.05.030
URI: https://dspace.lboro.ac.uk/2134/26616
Publisher Link: https://doi.org/10.1016/j.solener.2017.05.030
ISSN: 0038-092X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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