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Experimental Study of Wind Effects on Unglazed Transpired Collectors

Title:

Experimental Study of Wind Effects on Unglazed Transpired Collectors

Vasan, Neetha (2012) Experimental Study of Wind Effects on Unglazed Transpired Collectors. Masters thesis, Concordia University.

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Abstract

Unglazed transpired collectors (UTC) are one of the most efficient solar heating technologies available today. High wind velocity affects the performance of UTC; indeed, wind flow on the collector’s surface reduces useful heat transferred to the collector fluid by effecting convective heat losses and suction in the pores and thereby outflow from the plenum. Wind does not impinge uniformly on all points on a large area; the velocity distribution depends on wind direction and surroundings.
This thesis presents an experimental study in the Building Aerodynamics Laboratory at Concordia University and an analytical parametric study to assess the effect of wind velocity distribution on UTCs under the influence of approach wind direction and surrounding structures. Velocity measurements from wind tunnel experiments were applied to analytical models of UTC performance evaluation. The common assumption, in UTC analysis, that a reference wind velocity acts uniformly over the UTC surface, as opposed to the more realistic non-uniform distribution, has been shown to underestimate the values of convective heat loss coefficients. The study, when applied to the context of the JMSB solar-wall, indicated a reduction of thermal efficiency by 20 percentage points due to wind. Influence of surroundings on wind flow around the JMSB building has been evaluated. The study casts light on the importance of using actual velocity distributions in UTC analysis.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Thesis (Masters)
Authors:Vasan, Neetha
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Building Engineering
Date:20 December 2012
Thesis Supervisor(s):Stathopoulos, Theodore
Keywords:wind tunnel, unglazed transpired collectors, convective heat transfer
ID Code:975080
Deposited By: NEETHA VASAN
Deposited On:05 Jun 2013 15:40
Last Modified:18 Jan 2018 17:39
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References:

Athienitis, A. K., Bambara, J., O'Neill, B. & Faille, J., 2010. A prototype photovoltaic/thermal system integrated with transpired collector. Solar Energy, 85(1), pp. 139-153.

Augustus Leon, M. & Kumar, S., 2007. Mathematical modeling and thermal performance analysis of unglazed transpired solar collectors. Solar Energy, 81(1), pp. 62-75.

Bambara, J., 2012. Experimental Study of a Façade-integrated Photovoltaic/thermal System, M.A.Sc thesis: Concordia University, Montreal, Canada.

Blocken, B., Defraeye, T., Derome, D. & Carmeliet, J., 2009. High-resolution CFD simulations for forced convection heat transfer coefficients at the facade of a low-rise building.
Building and Environment, 44(12), pp. 2396-2412.

CIBS, 1979. Chartered Institute of Building Services Guide Book A, Section A3. London: Cited in : Sharples, S., 1984. Full-scale measurements of convective energy losses from exterior building surfaces. Building and Environment, 19(1), pp. 31-39.

CIBSE, 2006. Chartered Institute of Building Services Engineers Guide Book A, Section A3. 7 ed. London: CIBSE.

Conserval Engineering Inc., n.d. Company Info. [Online]
Available at: http://solarwall.com
[Accessed 8 May 2012].

Cordeau, S. & Barrington, S., 2011. Performance of unglazed solar ventilation air pre-heaters for broiler barns. Solar Energy, 85(7), pp. 1418-1429.

Davenport, A. G., 1967. The dependence of wind loads on meteorological parameters. Ottawa, Proceedings of the International Conference on Wind Effects on Buildings and Structures: University of Toronto Press, pp. 19-82.

Defraeye, T., Blocken, B. & Carmeliet, J., 2010. CFD analysis of convective heat transfer at the surfaces of a cube immersed in a turbulent boundary layer. International Journal of Heat and Mass Transfer, 53(1-3), pp. 297-308.

Defraeye, T., Blocken, B. & Carmeliet, J., 2011. Convective heat transfer coefficients for exterior building surfaces: Existing correlations and CFD modelling. Energy Conservation and Management, 52(1), pp. 512-522.

Defraeye, T. & Carmeliet, J., 2010. A methodology to assess the influence of local wind conditions and building orientation on the convective heat transfer at building surfaces. Environmental Modelling & Software, 25(12), pp. 1813-1824.

Delisle, V., 2008. Analytical and experimental study of a PV/thermal transpired solar collector, PhD Thesis: University of Waterloo, Waterloo, Ontario.

Djunaedy, E., Hensen, J. L. M. & Loomans, M. G. L. C., 2004. Comparing internal and external run-time coupling of CFD and building energy simulation software. Coimbra, Portugal, Proceedings of the 9th ROOMVENT International Conference on Air Distribution in Rooms, 5-8 September 2004, University of Coimbra, pp. 393-396.

Dymond, C. & Kutscher, C., 1997. Development of a flow distribution and design model for transpired solar collectors. Solar Energy, 60(5), pp. 291-300.

Environment Canada, 2012. National Climate Data and Information Archive. [Online]
Available at: http://climate.weatheroffice.gc.ca/climateData/canada_e.html
[Accessed October 2012].

Fleck, B. A., Meier, R. M. & Matovic, M. D., 2002. A field study of the wind effects on the performance of an unglazed transpired solar collector. Solar Energy, 73(3), pp. 209-216.

Gawlik, K. M. & Kutscher, C. F., 2002. Wind heat loss from corrugated, transpired solar collectors. Journal of Solar Energy Engineering, 124(3), pp. 256-261.

Gunnewiek, L. H., Hollands, K. G. T. & Brundrett, E., 2002. Effect of wind on flow distribution in unglazed transpired-plate collectors. Solar Energy, 72(4), pp. 317-325.

Heinrich, M., 2007. Transpired Solar Collectors - Results of a Field Trial, Juddgeford, New Zealand: BRANZ Ltd.

Holmes, J. D., 2007. Wind loading of structures. In: New York, USA: Taylor & Francis, pp. 55-60.

Ito, N., Kimura, K. & Oka, J., 1972. A field experiment study on the convective heat transfer coefficient on exterior surface of a building. ASHRAE Transactions, 79(1), pp. 184-191.

Jürges , W., 1924. Der Wärmeübergang an einer ebenen Wand. Beihefte zum Gesundheits-Ingenieur, 1(19), pp. 1227-1249. Cited in : Sharples, S., 1984. Full-scale measurements of convective energy losses from exterior building surfaces. Building and Environment, 19(1), pp. 31-39.

Kutscher, C. F., 1992. An investigation of heat transfer for air flow through low porosity perforated plates, PhD Thesis: University of Colorado, Colorado, USA.

Kutscher, C. F., 1994. Heat exchange effectiveness and pressure drop for air flow through perforated plates with and without crosswind. Journal of Heat Transfer, 116(2), pp. 391-399.

Kutscher, C. F., Christensen, C. B. & Barker, G. M., 1993. Unglazed transpired solar collectors: heat loss theory. Journal of Solar Energy Engineering, 115(3), pp. 182-188.

Liu, Y. & Harris, D. J., 2007. Full-scale measurements of convective coefficient on external surface of a low-rise building in sheltered conditions. Building and Environment, 42(7), pp. 2718-2736.

Loveday, D. L. & Taki, A. H., 1996. Convective heat transfer coefficients at a plane surface on a full-scale building facade. International Journal of Heat and Mass Transfer, 39(8), pp. 1729-1742.

Mirsadeghi, M., Blocken, B. & Hensen, J. L. M., 2008. Validation of external BES-CFD coupling by inter-model comparison. Kyoto, Japan. In Murakami, S (Ed.), 29th AIVC Conference, 14-16 October 2008, pp. 193-198.

Moore, R., 2005. Solar air heating and cooling, Camberwell, Australia: ISS Institute Inc..

Morse, E. S., 1881. Warming and ventilating apartments by the sun's rays. Massachusetts, U.S.A, Patent No. 246626.

NRCan, 2010. Solar Thermal. [Online]
Available at: http://canmetenergy.nrcan.gc.ca
[Accessed 15 November 2012].

NREL, 1998. Transpired Collectors (Solar Preheaters for Outdoor Ventilation Air), Golden, Colorado: U.S. Department of Energy.

O'Neill, B., Chen, Y. & Koziol, A., 2011. Description of the JMSB BIPV/T solar system, monitoring and database, Solar Buildings Research Network: Concordia University, Montreal.

REN21, 2012. Renewables 2012 Global Status Report, Paris: REN21 Secretariate.

R. M. Young Company, n.d. Wind Monitor. [Online]
Available at: http://www.youngusa.com/products/7/8.html
[Accessed 20 December 2012].

Shao, J. et al., 2010. Field measurement of the convective heat transfer coefficient on vertical external building surface using naphthalene sublimation method. Journal of Building Physics, 33(4), pp. 307-326.

Sharples, S., 1984. Full-scale measurements of convective energy losses from exterior building surfaces. Building and Environment, 19(1), pp. 31-39.

Simiu, E., 1981. Modern developments in wind engineering : Part 1. Engineering Structures, 3(4), pp. 233-241.

Stathopoulos, T., 1984. Design and fabrication of a wind tunnel for building aerodynamics. Journal of Wind Engineering and Industrial Aerodynamics, 16(2-3), pp. 361-376.

Stathopoulos, T., 2007. In: T. Stathopoulos & C. C. Baniotopoulos, eds. Wind effects on buildings and design of wind-sensitive structures. International Center for Mechanical Sciences, Udine, Italy: Springer Wien New York, pp. 1-15.

Test, F. L., Lessmann, R. C. & Johary, A., 1981. Heat transfer during wind flow over rectangular bodies in the natural environment. Journal of Heat Transfer, 103(2), pp. 262-267.

Van Decker, G. W. E., Hollands, K. G. T. & Brunger, A. P., 2001. Heat-exchange relations for unglazed transpired solar collectors with circular holes on a square or triangular pitch. Solar Energy, 71(1), pp. 33-45.

Vasan, N. & Stathopoulos, T., 2012. Wind Tunnel Assessment of the Wind Velocity Distribution on. Halifax, Canada, Proceedings of eSim 2012: The Canadian Conference on Building Simulation, 1-4 May, pp. 61-74.
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