Performance assessment of tank fluid purging and night cooling as overheating prevention techniques for photovoltaic-thermal (PV-T) solar water heating systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Tank fluid purging and night cooling are two overheating prevention techniques with potential to prevent photovoltaic-thermal collectors from experiencing temperatures capable of undermining their longevity and commercial appeal. Both techniques are readily available, inexpensive but inherently wasteful to use. Dynamic numerical simulations were conducted to determine the primary energy efficiency and the level of protection afforded by these techniques in active residential grid-connected solar domestic hot water systems. Also evaluated was the use of occupancy rate information, possible via so-called “smart systems”, to complement the techniques. The results revealed better performances for systems using stagnation control schemes relative to those not using them. Also, night cooling was shown to be unable to prevent overheating reliably while tank fluid purging proved to be more apt but resulted in substantial waste of water annually, which was slightly reduced by combining it with night cooling, which in turn proved to be the most energy efficient solution.

Original languageEnglish
Title of host publicationTechnological Innovation for Smart Systems - 8th IFIP WG 5.5/SOCOLNET Advanced Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2017, Proceedings
PublisherSpringer New York LLC
Pages337-347
Number of pages11
Volume499
ISBN (Print)9783319560762
DOIs
Publication statusPublished - 2017
Event8th IFIP WG 5.5/SOCOLNET Advanced Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2017 - Costa De Caparica, Portugal
Duration: 3 May 20175 May 2017

Publication series

NameIFIP Advances in Information and Communication Technology
Volume499
ISSN (Print)1868-4238

Conference

Conference8th IFIP WG 5.5/SOCOLNET Advanced Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2017
CountryPortugal
CityCosta De Caparica
Period3/05/175/05/17

Keywords

  • Cooling
  • Night
  • Photovoltaic
  • Purging
  • Stagnation
  • Thermal

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    Magalhães, P. M. L. P., Martins, J. F. A., & Joyce, A. L. M. (2017). Performance assessment of tank fluid purging and night cooling as overheating prevention techniques for photovoltaic-thermal (PV-T) solar water heating systems. In Technological Innovation for Smart Systems - 8th IFIP WG 5.5/SOCOLNET Advanced Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2017, Proceedings (Vol. 499, pp. 337-347). (IFIP Advances in Information and Communication Technology; Vol. 499). Springer New York LLC. https://doi.org/10.1007/978-3-319-56077-9_33