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      MEASUREMENT OF THE EFFICIENCY OF EVACUATED TUBE SOLAR COLLECTORS UNDER VARIOUS OPERATING CONDITIONS

      1 , 2

      Journal of Green Building

      College Publishing

      solar collector, evacuated tube, solar hot water

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          Abstract

          The operating efficiency of evacuated tubes themselves under varying environmental conditions and installation scenarios, independent of water and space heating auxiliary equipment, are not readily available values. Further, Manitoba specific data has not been established. The purpose of this research program was to measure the efficiency of evacuated tube solar collectors under various operating conditions including: the angle of inclination towards the incident solar radiation, heat transfer fluid flow rate, glazing installation, and number of evacuated tubes. The operating conditions and configurations were chosen to represent realistic or probable installation scenarios and environmental conditions. Furthermore, the research aimed to identify the suitability of evacuated tube solar collectors to each of the scenarios. These design values are of use for appropriate sizing of water or space heating systems, system configuration and optimization, and calculation of return on investment. The scope of the research project was limited to the efficiency of various configurations of a 32-tube panel, not the entire solar domestic hot water or space heating system. Thus, factors such as heat loss in the tubing, solar storage tank, and heat exchanger efficiency were not investigated. The findings indicated that efficiency varied by approximately 5% between the different collector configurations, as observed from the overlay graph of results. When the efficiency of a collector is considered within a system it is proposed that effectiveness may be a better measure of overall performance.

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          Most cited references 10

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          Solar thermal collectors and applications

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            Water-in-glass evacuated tube solar water heaters

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              Performance of water-in-glass evacuated tube solar water heaters

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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Summer 2012
                : 7
                : 3
                : 114-130
                Author notes

                1Graduate Student, Department of Biosystems Engineering, University of Manitoba, Winnipeg, Canada.

                2Associate Professor, Director of the Alternative Village, Department of Biosystems Engineering, University of Manitoba, Winnipeg, Canada, kjdick@ 123456ms.umanitoba.ca .

                Article
                jgb.7.3.114
                10.3992/jgb.7.3.114
                © 2012 College Publishing

                Volumes 1-7 of JOGB are open access and do not require permission for use, though proper citation should be given. To view the licenses, visit https://creativecommons.org/licenses/by-nc/4.0/

                Page count
                Pages: 17
                Product
                Categories
                RESEARCH ARTICLES

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