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.
Original language | English |
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Pages (from-to) | 1160-1167 |
Journal | Renewable Energy |
Volume | 113 |
Early online date | 22 Jun 2017 |
DOIs | |
Publication status | Published (in print/issue) - 31 Dec 2017 |
Keywords
- ICSSWH
- Pre-heat
- Thermal flux simulation
- Thermal diode
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Aggelos Zacharopoulos
- Belfast School of Architecture & the Be - Senior Lecturer
- Faculty Of Computing, Eng. & Built Env. - Senior Lecturer
Person: Academic