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IJSTR >> Volume 7 - Issue 8, August 2018 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Effect Of Enclosed Air Gap And Empty Gap For Thermal Screens In PV Cells Isolation Inside The Hybrid Photovoltaic-Thermal Channel On A Rooftop Designed For Natural Ventilation In Bioclimatic Buildings

[Full Text]

 

AUTHOR(S)

Y. Nougbléga, K. Kpode, K. Atchonouglo, M. Banna, J.C.Dupré

 

KEYWORDS

Empty air gap, Enclosed air gap, Mixed convection, Hybrid Photovoltaic/Thermal collectors, Thermal and electrical Efficiencies.

 

ABSTRACT

The present paper reports numerical investigation results of mixed convection in the inclined Hybrid Photovoltaic–Thermal (PV/T) channel using the empty or enclosed air gaps for the solar PV cells isolation. The aim of this work is to evaluate streamlines and isotherms patterns in order to analyze the effect of thermal screens on PV/T Performances using a stream function-vorticity formulation. Results are presented in terms of streamlines, isotherms, outlet velocity, heat transfer, electrical output and thermal efficiency of the PV/T with variation in control parameters such as Reynolds number (2  Re  250), the Grashof number(10  Gr 106), the Aspect ratio (2  A  10), and the enclosed air gap width (0%  B  60%). The results show that empty and enclosed air gaps can respectively significantly improve electrical efficiency and air draught reducing back flow in the channel.

 

REFERENCES

[1] H.P. Garg and R.S. Adhkari, “Conventional hybrid photovoltaic/thermal (PV/T) air heating collectors: steady-state simulation”,Renewable energy, Vol. 11, No 3, pp. 363-385, 1997.
[2] V.B. Omubo-Pepple, C. Israel-Cookey, G.I. Alaminokuma, “ Effects of Temperature, Solar flux and Relative Humidity the Efficient conversion of solar energy to electricity”,European Journal of Scientific Research, Vol.35, No2 pp.173-180, 2009.
[3] A. Guiavarch, B. Peuportier, “Photovoltaic collectors efficiency according to their integration in buildings,Solar Energy, Vol. 80, pp. 65-77, 2006.
[4] BrinkworthBJ.Cross ,BM,Marshall, “Thermal Regulation of Photovoltaic cladding”,Solar Energy, 61(3): 169-78, 1997
[5] P. Trinuruk, C.Sorapipatana and D. Chenvidhya, “Effects of Air Gap Spacing betweena Photovoltaic Panel and Building Envelope on Electricity Generation andHeat Gains through a Building”,Asian J. Energy Environ., Vol. 8, Issue 1 and 2, pp. 73-95., 2007.
[ 6] A. Raji, M. Hasnaoui, A. Bahlaoui, “ Numerical study of natural convection dominated heat transfer in a ventilated cavity: Case of forced flow playing simultaneousassisting and opposing roles”,International Journal of Heat and Fluid Flow, Vol. 29 1174–1181, 2008
[7] E.Bilgen, H.Oztop, “ Natural convection heat transfer in partially open inclined square cavities”, International Journal of Heat and Mass Transfer, Vol. 48, pp. 1470- 1479, 2005.
[8] T.B.Thong, L.M.Quaan and O.K. Seng, “ Simulations of Flow in a solar roof collector driven by natural convection”, 16thAustralasian Fluid Mechanics ConferenceCrown Plaza, Gold Coast, Australia2-7 December 2007, pp. 666- 670.
[9] S.L. Sinha, R.C. Arora, S. Roy, “ Numerical simulation of two-dimensional room air flow with and without buoyancy”, Energy and Buildings, Vol.32, pp.121–129,2000
[10] Woods L.C., “A note of numerical solution of fourth differential equations”, Aero. Q., Vol.5, pp. 176-l 84, 1954.
[11] O. Aydin, A.Unal, T.Ayhan, “Natural convection in rectangular enclosures heated from one side and cooled from the ceiling“,International Journal of Heat and Mass Transfer, Vol.42 , pp.2345-2355, 1999
[12] K. Sopian, H.T Liu, S Kakac, T.N Veziroglu,“Performance of a double pass photovoltaic thermal solar collector suitable for solar drying systems”,Energy conversion & Management, Vol. 41 353-365, 2000.