TY  - JOUR
T1  - A Numerical Study on Determination of the Optimal Hole Diameter and Pitch Value for the Unglazed Transpired Solar Collectors
TT  - A Numerical Study on Determination of the Optimal Hole Diameter and Pitch Value for the Unglazed Transpired Solar Collectors
AU  - Khanları, Ataollah
AU  - Ay, İlker
PY  - 2019
DA  - March
DO  - 10.2339/politeknik.477094
JF  - Politeknik Dergisi
PB  - Gazi Üniversitesi
WT  - DergiPark
SN  - 2147-9429
SP  - 163
EP  - 168
VL  - 22
IS  - 1
LA  - en
AB  - This investigation is concerned with the unglazedtranspired solar collector (solar wall) type. With this purpose, the optimumhole arrangement has been determined by investigating the effect of hole diameterand pitch on the thermal efficiency of the system for different environmentalcondition. A thermodynamic model is used to simulate the heating process withinthe system. As a result, for extremely small hole diameters or extremely largehole pitches, the system works as a Trombe wall (glazed thermal storage wall)rather than an unglazed transpired solar collector because of the fact thatthere is not enough air flow through the absorber.
KW  - Unglazed solar collectors
KW  - solar wall
KW  - hole diameter
KW  - pitch
KW  - efficiency
N2  - This investigation is concerned with the unglazedtranspired solar collector (solar wall) type. With this purpose, the optimumhole arrangement has been determined by investigating the effect of hole diameterand pitch on the thermal efficiency of the system for different environmentalcondition. A thermodynamic model is used to simulate the heating process withinthe system. As a result, for extremely small hole diameters or extremely largehole pitches, the system works as a Trombe wall (glazed thermal storage wall)rather than an unglazed transpired solar collector because of the fact thatthere is not enough air flow through the absorber.
CR  - 1] 	www.solarwall.com.
CR  - [2]	Kutscher C.F., “An investigation of heat transfer for air flow through low porosity perforated plates”, Ph.D. Thesis, University of Colorado, Department of Mechanical Engineering, Colorado, USA, (1992).
CR  - [3] 	Hollick J.C. “Unglazed solar wall air heaters”, Renewable Energy, 5, 415-421, (1994).
CR  - [4] 	Hollick J.C. “Solar cogeneration panels”, Renewable Energy, 15, 195-200, (1998).
CR  - [5] 	Shukla A., Nkwetta D.N., Cho Y.J., Stevenson V. and Jones P., “A state of art review on the performance of transpired solar collector”, Renewable and Sustainable Energy Reviews, 16, 3975-3985, (2012).
CR  - [6] 	Kutscher C.F. “Heat exchange effectiveness and pressure drop for air flow through perforated plates with and without crosswind”, Journal of Heat Transfer, 116, 391-399, (1994).
CR  - [7] 	Augustus Leon M. and Kumar S., “Mathematical modeling and thermal performance analysis of unglazed transpired solar collectors”, Solar Energy, 81, 62-75, (2007).
CR  - [8] 	Summers D.N. “Thermal Simulation and Economic Assessment of Unglazed Transpired Collector Systems”, M.Sc. Thesis, University of Wisconsin-Madison, USA, (1995).
CR  - [9] 	Van Decker G.W.E., Hollands K.G.T., and Brunger A.P., “Heat-exchange relations for unglazed transpired solar collectors with circular holes on a square or triangular pitch”, Solar Energy, 71, 33-45, (2001).
CR  - [10] 	Motahar S., and Alemrajabi A.A., “An Analysis of Unglazed Transpired Solar Collectors Based on Exergetic Performance Criteria”, International Journal of Thermodynamics, 13, 153-160, (2010).
CR  - [11] 	Kutscher C.F., Christensen C., and Barker G., “Unglazed transpired solar collectors: heat loss theory”, Journal of Solar Engineering, 115, 182-188, (1993).
CR  - [12] 	Moaveni S., Tebbe P.A., Schwartzkopf L., Dobmeier J., Gehrke J., and Simones M.A., “numerical model for thermal performance of an unglazed transpired solar collector,” ASME 5th International Conference on Energy Sustainability, 1-5, (2011).
CR  - [13] 	Gunnewıek L.H., Brundrett E., and Hollands K.G.T., “Flow distribution in unglazed transpıred plate solar aır heaters of large area”, Solar Energy, 58, 221-237, (1996).
CR  - [14] 	Fleck B.A., Meier R.M., and Matovic M.D., “A field study of the wind effects on the performance of an unglazed transpired solar collector,” Solar Energy, 73, 209-216, (2002).
CR  - [15] 	Tırıs Ç., and Söhmen H.M., “Türkiye’de üretilen güneş enerjili su ısıtma sistemlerinde kullanılan güneş kollektörleri,” Güneş günü sempozisyomu, 99, 1999, 25-27, (1999).
CR  - [16] 	Goswami D.Y., Kreith F., and Kreider J.F., “Principles of Solar Engineering”, Second Edition. Taylor &Farncis Publishing Company, (2000).
CR  - [17] 	Incropera F.P., DeWitt D.P., Bergman T.L., and Lavine AS., “Fundamentals of Heat and Mass Transfer”, 6th Edition. John Wiley&SonsPublishing Company, (2007).
CR  - [18] 	Balagurusamy E., “Numerical Methods”, 25th Reprint. Tata McGraw-Hill Publishing Company, (2008).
UR  - https://doi.org/10.2339/politeknik.477094
L1  - https://dergipark.org.tr/tr/download/article-file/565048
ER  -