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The evolutionary thermal performance and development of a novel thermal diode pre-heat solar water heater under simulated heat flux conditions

Smyth, Mervyn, Quinlan, Patrick, Mondol, Jayanta, Zacharopoulos, Aggelos, McLarnon, Dominic and Pugsley, Adrian (2017) The evolutionary thermal performance and development of a novel thermal diode pre-heat solar water heater under simulated heat flux conditions. Renewable Energy, 113 . pp. 1160-1167. [Journal article]

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DOI: 10.1016/j.renene.2017.06.080

Abstract

This paper presents the development through experimental performance characterisation of a pre-heat ICSSWH that utilises a novel thermal diode operation to reduce ambient heat loss during non-collection periods. Using a bespoke thermal flux simulation test facility, 4 prototype versions of the pre-heat thermal diode ICSSWH were produced and evaluated (Mark I to IV) at Ulster University. Each prototype was developed and evolved on the previous design, encompassing performance improvements and fabrication enhancements. The concept has been designed and developed to be a sustainable, pre-heat alternative to other solar water heating systems traditionally used in DHW installations in retro-fit and social housing applications. The highest 6 h and 3 h collection efficiency was 33.2% and 41.97%, respectively under thermally simulated conditions for a unit with capillary matting and 150 mbar internal pressure (MIIIb 17). The lowest system ‘U’ value was 0.98Wm-2K-1 (long and thin raised pockets, MIV 12) under thermal (solar) flux simulation testing and no draw-off conditions. When the current prototype ICS units are compared with other conventional ICS systems, particularly in terms of thermal retention during non-collection periods, an improved performance is clearly demonstrated. The measured thermal losses were approximately 50% less than other similarly measured systems.

Item Type:Journal article
Keywords:ICSSWH; Pre-heat; Thermal flux simulation; Thermal diode
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute > Centre for Sustainable Technologies (CST)
Built Environment Research Institute
ID Code:38340
Deposited By: Dr Mervyn Smyth
Deposited On:10 Jul 2017 08:34
Last Modified:10 Jul 2017 08:34

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