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Integrated collector storage solar water heater under partial vacuum

Souliotis, Manolis, Papaefthimiou, Spiros, Caouris, Yiannis, Zacharopoulos, Aggelos, Quinlan, Patrick and Smyth, Mervyn (2017) Integrated collector storage solar water heater under partial vacuum. Energy, 139 . pp. 991-1002. [Journal article]

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DOI: 10.1016/j.energy.2017.08.074

Abstract

The work focuses on the experimental study of the heat diode mechanism in an Integrated Collector Storage Solar Water Heater (ICSSWH) for domestic applications. The solar device combines a horizontal cylindrical vessel with an asymmetric reflector trough (Compound Parabolic Concentrator e CPC). The cylindrical storage tank comprises two concentric cylindrical vessels: the outer absorbing vessel and the inner storage vessel. The annulus between the cylindrical vessels is partially depressurized and contains a small amount of water serving as Phase Change Material (PCM), which changes phase (mainly at low temperatures) thus producing vapor and creating a thermal diode transfer mechanism from the outer to the inner surfaces of the vessels. Several experimental results, including uncertainty analysis, are demonstrated through diagrams depicting temperature variations, mean daily efficiency and thermal losses coefficient. Additionally results from the variation of the temperature and the total pressure inside annulus are also presented. The results clearly show that the vapor's pressure plays the most important role regarding the thermal performance of the device.

Item Type:Journal article
Keywords:heat diode, ICSSWH, Compound Parabolic Concentrator, Phase Change Material, pressure
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute > Centre for Sustainable Technologies (CST)
Built Environment Research Institute
ID Code:39172
Deposited By: Dr Mervyn Smyth
Deposited On:21 Dec 2017 09:15
Last Modified:02 Jan 2018 16:20

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