A new TRNSYS collector model for evacuated tubular collectors with tubular absorbers is developed. Traditional flat plate collector performance equations have been integrated over the whole absorber circumference. On each tube the model determines the size and position of the shadows caused by the neighbor tube. An all glass tubular collector with tubular absorbers with 14 tubes connected in parallel is investigated theoretically with the model and experimentally in an outdoor collector test facility. Performance calculations with the new model are compared with measured results and a good degree of similarity between the measured and calculated results is found. Further, it is illustrated how the model can be used for geometrical parameter studies both for constant collector mean fluid temperatures and for varying temperature conditions in a solar heating plant. These investigations are performed for two climates: Copenhagen (Denmark) and Uummannaq (Greenland).
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e-mail: ljs@byg.dtu.dk
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August 2005
Research Papers
Modeling Shadows on Evacuated Tubular Collectors With Cylindrical Absorbers
Louise Jivan Shah,
Louise Jivan Shah
Department of Civil Engineering,
e-mail: ljs@byg.dtu.dk
Technical University of Denmark
, Building 118, DK-2800 Kgs. Lyngby, Denmark
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Simon Furbo
Simon Furbo
Department of Civil Engineering,
Technical University of Denmark
, Building 118, DK-2800 Kgs. Lyngby, Denmark
Search for other works by this author on:
Louise Jivan Shah
Department of Civil Engineering,
Technical University of Denmark
, Building 118, DK-2800 Kgs. Lyngby, Denmarke-mail: ljs@byg.dtu.dk
Simon Furbo
Department of Civil Engineering,
Technical University of Denmark
, Building 118, DK-2800 Kgs. Lyngby, DenmarkJ. Sol. Energy Eng. Aug 2005, 127(3): 333-342 (10 pages)
Published Online: November 8, 2004
Article history
Received:
July 8, 2004
Revised:
November 8, 2004
Citation
Shah, L. J., and Furbo, S. (November 8, 2004). "Modeling Shadows on Evacuated Tubular Collectors With Cylindrical Absorbers." ASME. J. Sol. Energy Eng. August 2005; 127(3): 333–342. https://doi.org/10.1115/1.1878872
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