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

Mervyn Smyth, Patrick Quinlan, Jayanta Mondol, Aggelos Zacharopoulos, Dominic McLarnon, Adrian Pugsley

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.
LanguageEnglish
Pages1160-1167
JournalRenewable Energy
Volume113
Early online date22 Jun 2017
DOIs
Publication statusPublished - Dec 2017

Fingerprint

Solar water heaters
Heat flux
Diodes
Fluxes
Hot Temperature
Test facilities
Heat losses
Heating
Fabrication

Keywords

  • ICSSWH
  • Pre-heat
  • Thermal flux simulation
  • Thermal diode

Cite this

@article{9a5ab23f1aea48e49539bc5f3267f859,
title = "The evolutionary thermal performance and development of a novel thermal diode pre-heat solar water heater under simulated heat flux conditions",
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.",
keywords = "ICSSWH, Pre-heat, Thermal flux simulation, Thermal diode",
author = "Mervyn Smyth and Patrick Quinlan and Jayanta Mondol and Aggelos Zacharopoulos and Dominic McLarnon and Adrian Pugsley",
year = "2017",
month = "12",
doi = "10.1016/j.renene.2017.06.080",
language = "English",
volume = "113",
pages = "1160--1167",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier",

}

TY - JOUR

T1 - The evolutionary thermal performance and development of a novel thermal diode pre-heat solar water heater under simulated heat flux conditions

AU - Smyth, Mervyn

AU - Quinlan, Patrick

AU - Mondol, Jayanta

AU - Zacharopoulos, Aggelos

AU - McLarnon, Dominic

AU - Pugsley, Adrian

PY - 2017/12

Y1 - 2017/12

N2 - 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.

AB - 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.

KW - ICSSWH

KW - Pre-heat

KW - Thermal flux simulation

KW - Thermal diode

U2 - 10.1016/j.renene.2017.06.080

DO - 10.1016/j.renene.2017.06.080

M3 - Article

VL - 113

SP - 1160

EP - 1167

JO - Renewable Energy

T2 - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -