Journals / Politeknik Dergisi / 2019 / Cilt: 22 - Sayı: 1

A Numerical Study on Determination of the Optimal Hole Diameter and Pitch Value for the Unglazed Transpired Solar Collectors

Pages
163–168
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

As a result, for extremely small hole diameters or extremely large hole pitches, the system works as a Trombe wall (glazed thermal storage wall) rather than an unglazed transpired solar collector because of the fact that there is not enough air flow through the absorber.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This investigation is concerned with the unglazed transpired solar collector (solar wall) type.
📊
Key Findings & Data:With this purpose, the optimum hole arrangement has been determined by investigating the effect of hole diameter and pitch on the thermal efficiency of the system for different environmental condition.
💡
Conclusion & Impact:As a result, for extremely small hole diameters or extremely large hole pitches, the system works as a Trombe wall (glazed thermal storage wall) rather than an unglazed transpired solar collector because of the fact that there is not enough air flow through the absorber.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Unglazed solar collectors · solar wall · hole diameter

Abstract

This investigation is concerned with the unglazed transpired solar collector (solar wall) type. With this purpose, the optimum hole arrangement has been determined by investigating the effect of hole diameter and pitch on the thermal efficiency of the system for different environmental condition. A thermodynamic model is used to simulate the heating process within the system. As a result, for extremely small hole diameters or extremely large hole pitches, the system works as a Trombe wall (glazed thermal storage wall) rather than an unglazed transpired solar collector because of the fact that there is not enough air flow through the absorber.

Özet

This investigation is concerned with the unglazed transpired solar collector (solar wall) type. With this purpose, the optimum hole arrangement has been determined by investigating the effect of hole diameter and pitch on the thermal efficiency of the system for different environmental condition. A thermodynamic model is used to simulate the heating process within the system. As a result, for extremely small hole diameters or extremely large hole pitches, the system works as a Trombe wall (glazed thermal storage wall) rather than an unglazed transpired solar collector because of the fact that there is not enough air flow through the absorber.

🔖

Cite This Article

KHANLARI, A., AY, İ. (2019). A Numerical Study on Determination of the Optimal Hole Diameter and Pitch Value for the Unglazed Transpired Solar Collectors. Politeknik Dergisi, Cilt: 22 - Sayı: 1, 163–168. https://ajindex.com/articles/307091

References (1)

  1. 1] www.solarwall.com. [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). [3] Hollick J.C. “Unglazed solar wall air heaters”, Renewable Energy, 5, 415-421, (1994). [4] Hollick J.C. “Solar cogeneration panels”, Renewable Energy, 15, 195-200, (1998). [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). [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). [7] Augustus Leon M. and Kumar S., “Mathematical modeling and thermal performance analysis of unglazed transpired solar collectors”, Solar Energy, 81, 62-75, (2007). [8] Summers D.N. “Thermal Simulation and Economic Assessment of Unglazed Transpired Collector Systems”, M.Sc. Thesis, University of Wisconsin-Madison, USA, (1995). [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). [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). [11] Kutscher C.F., Christensen C., and Barker G., “Unglazed transpired solar collectors: heat loss theory”, Journal of Solar Engineering, 115, 182-188, (1993). [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). [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). [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). [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). [16] Goswami D.Y., Kreith F., and Kreid