Article | World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden | Experimental Performance of Unglazed Transpired Solar Collector for Air Heating

Title:
Experimental Performance of Unglazed Transpired Solar Collector for Air Heating
Author:
Hoy-Yen Chan: Department of Architecture and Built Environment, University of Nottingham, Nottingham, UK Saffa Riffat: Department of Architecture and Built Environment, University of Nottingham, Nottingham, UK Jie Zhu: Department of Architecture and Built Environment, University of Nottingham, Nottingham, UK
DOI:
10.3384/ecp110571853
Download:
Full text (pdf)
Year:
2011
Conference:
World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden
Issue:
057
Article no.:
015
Pages:
1853-1859
No. of pages:
7
Publication type:
Abstract and Fulltext
Published:
2011-11-03
ISBN:
978-91-7393-070-3
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


Unglazed transpired solar collectors are usually mounted on the side of the building that receives the most sunlight. It is a fan-assisted system; whereby air is drawn through the holes into the plenum and the warm air is then ducted into the building. The primary reason for using the unglazed transpired metal plate as the solar collector is not only to absorb the solar heat but also to reduce the convection heat loss. These in return will have higher heat exchange effectives and heating efficiency. Though many research have been carried out to study the Nusselt number correlations; heat exchange effectiveness; wind effects and pressure drop; yet only hand full of research that involved heat transfer study that including the vertical airflow in the plenum. This paper is to assess the heating performance of this system through experimental tests which involve the study of temperature rise along the vertical air flow in the plenum. Results show that the temperature of the air flowing vertically is increasing gradually from the bottom to the top of the plenum. This is contrast with the previous studies which assumed that the temperature of the air in the plenum is constant and same as the outlet air temperature at the top of the plenum. The temperature rise is increasing with solar radiation intensity. Temperature rise along the plenum contributes between 30 to 60% of the total temperature rise at a constant suction velocity. On the other hand; temperature rise is decreasing with suction velocity. Values of temperature rise along the plenum are between 30 to 50% of the total temperature rise for suction velocity of 0.03 to 0.05 ms-1 at 600Wm-2 of solar radiation. Therefore; this study has proved that heat transfer of vertical airflow in the plenum has a crucial heating effect.

Keywords: Unglazed transpired solar collector; Air heating; Solar façade

World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Author:
Hoy-Yen Chan, Saffa Riffat, Jie Zhu
Title:
Experimental Performance of Unglazed Transpired Solar Collector for Air Heating
DOI:
10.3384/ecp110571853
References:
[1] Kutscher C. F; Heat exchange effectiveness and pressure drop for air flow through perforated plates with and without crosswinds; J Heat Transfer 116; 1994; pp. 391‚Äď9. doi: 10.1115/1.2911411.
[2] M. Augustus Leon; S. Kumar; Mathematical modeling and thermal performance analysis of unglazed transpired solar collectors; Solar Energy 81; 2007; pp. 62-75. doi: 10.1016/j.solener.2006.06.017.
[3] Kutscher; C.F.; Christensen; C.B.; Barker; G.M; Unglazed transpired solar collectors: heat loss theory; ASME Journal of Solar Engineering 115; 1993; pp. 182‚Äď8. doi: 10.1115/1.2930047.
[4] Dymond C.; and Kutscher; C.; Development of a flow distribution and design model for transpired solar collectors; Solar Energy 60; 1997; pp. 291-300. doi: 10.1016/S0038-092X(96)00157-0.
[5] L. H. Gunnewiek; E. Brundrett; K. G. T. Hollands; Flow distribution in unglazed transpired plate solar air heaters of large area; Solar Energy 58; 1996; pp. 227-37. doi: 10.1016/S0038-092X(96)00083-7.
[6] Kutscher C. F.; An investigation of heat transfer for air flow through low porosity perforated plates; Colorado: University of Colorado; 1992.

World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Author:
Hoy-Yen Chan, Saffa Riffat, Jie Zhu
Title:
Experimental Performance of Unglazed Transpired Solar Collector for Air Heating
DOI:
10.3384/ecp110571853
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