Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector

Manolis Souliotis, Patrick Quinlan, Mervyn Smyth, Yiannis Tripanagnostopoulos, Aggelos Zacharopoulos, Miguel Ramirez, Panagiotis Yianoulis

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

A novel integrated collector storage solar water heater (ICSSWH) was designed, optically analysed and experimentally studied. The unit was based around a heat retaining ICS vessel design consisting of two concentric cylinders mounted horizontally inside a stationary truncated asymmetric compound parabolic concentrating (CPC) reflector trough. The annulus between the cylinders was partially evacuated and contained a small amount of water, which changed phase at low temperature, producing a vapour and creating a thermal diode transfer mechanism from the outer absorbing surface to the inner storage vessel surface. The absorbing outer vessel surface covered with selective absorber film and was partially exposed to solar radiation. The remaining vessel surface area (including the vessel ends) was thermally insulated to improve heat retention during the night. Curved reflectors with a high reflectance along with high transmittance glazing were also used to improve effective operation of the ICS system. The thermal behaviour of the ICS system was compared to that of a Flat Plate Thermosiphonic Unit (FPTU). The experimental results showed that the ICS system is as effective during daily operation as it is during the night. Furthermore, the thermal loss coefficient during night gives similar values between the ICS system and FPTU.
Original languageEnglish
Pages (from-to)2474-2487
JournalSolar Energy
Volume85
Issue number10
DOIs
Publication statusPublished - 2011

Keywords

  • Integrated collector storage solar water heaters (ICSSWH)
  • Compound parabolic concentrating (CPC) reflector troughs
  • Optical study
  • Thermal performance

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