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

48 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.
LanguageEnglish
Pages2474-2487
JournalSolar Energy
Volume85
Issue number10
DOIs
Publication statusPublished - 2011

Fingerprint

Solar water heaters
Solar radiation
Diodes
Vapors
Hot Temperature
Water

Keywords

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

Cite this

Souliotis, Manolis ; Quinlan, Patrick ; Smyth, Mervyn ; Tripanagnostopoulos, Yiannis ; Zacharopoulos, Aggelos ; Ramirez, Miguel ; Yianoulis, Panagiotis. / Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector. In: Solar Energy. 2011 ; Vol. 85, No. 10. pp. 2474-2487.
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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.",
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author = "Manolis Souliotis and Patrick Quinlan and Mervyn Smyth and Yiannis Tripanagnostopoulos and Aggelos Zacharopoulos and Miguel Ramirez and Panagiotis Yianoulis",
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Souliotis, M, Quinlan, P, Smyth, M, Tripanagnostopoulos, Y, Zacharopoulos, A, Ramirez, M & Yianoulis, P 2011, 'Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector', Solar Energy, vol. 85, no. 10, pp. 2474-2487. https://doi.org/10.1016/j.solener.2011.07.005

Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector. / Souliotis, Manolis; Quinlan, Patrick; Smyth, Mervyn; Tripanagnostopoulos, Yiannis; Zacharopoulos, Aggelos; Ramirez, Miguel; Yianoulis, Panagiotis.

In: Solar Energy, Vol. 85, No. 10, 2011, p. 2474-2487.

Research output: Contribution to journalArticle

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T1 - Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector

AU - Souliotis, Manolis

AU - Quinlan, Patrick

AU - Smyth, Mervyn

AU - Tripanagnostopoulos, Yiannis

AU - Zacharopoulos, Aggelos

AU - Ramirez, Miguel

AU - Yianoulis, Panagiotis

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Integrated collector storage solar water heaters (ICSSWH)

KW - Compound parabolic concentrating (CPC) reflector troughs

KW - Optical study

KW - Thermal performance

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JO - Solar Energy

T2 - Solar Energy

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SN - 0038-092X

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