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2017 | OriginalPaper | Buchkapitel

Performance Assessment of Tank Fluid Purging and Night Cooling as Overheating Prevention Techniques for Photovoltaic-Thermal (PV-T) Solar Water Heating Systems

verfasst von : Pedro M. L. P. Magalhães, João F. A. Martins, António L. M. Joyce

Erschienen in: Technological Innovation for Smart Systems

Verlag: Springer International Publishing

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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.

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Metadaten
Titel
Performance Assessment of Tank Fluid Purging and Night Cooling as Overheating Prevention Techniques for Photovoltaic-Thermal (PV-T) Solar Water Heating Systems
verfasst von
Pedro M. L. P. Magalhães
João F. A. Martins
António L. M. Joyce
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-56077-9_33