Double Pass Solar Air Heater with Transvers Fins and without Absorber Plate

Authors: A. J. Mahmood, L. B. Y. Aldabbagh

Abstract:

The counter flow solar air heaters, with four transverse fins and wire mesh layers are constructed and investigated experimentally for thermal efficiency at a geographic location of Cyprus in the city of Famagusta. The absorber plate is replaced by sixteen steel wire mesh layers, 0.18 x 0.18cm in cross section opening and a 0.02cm in diameter. The wire mesh layers arranged in three groups, first and second include 6 layers, while the third include 4 layers. All layers fixed in the duct parallel to the glazing and each group separated from the others by wood frame thickness of 0.5cm to reduce the pressure drop. The transverse fins arranged in a way to force the air to flow through the bed like eight letter path with flow depth 3cm. The proposed design has increased the heat transfer rate, but on other hand causes a high pressure drop. The obtained results show that, for air mass flow rate range between 0.011-0.036kg/s, the thermal efficiency increases with increasing the air mass flow. The maximum efficiency obtained is 65.6% for the mass flow rate of 0.036kg/s. Moreover, the temperature difference between the outlet flow and the ambient temperature, ΔT, reduces as the air mass flow rate increase. The maximum difference between the outlet and ambient temperature obtained was 43°C for double pass for minimum mass flow rate of 0.011kg/s. Comparison with a conventional solar air heater collector shows a significantly development in the thermal efficiency.

Keywords: Counter flow, solar air heater (SAH), Wire mesh, Fins, Thermal efficiency.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070503

References:

[1] Alvarez, A., Cabeza, O., Muniz, M.C., Varela, L.M., Experimental and numerical investigation of a flat-plate solar collector. Energy 35 (2010) 3707-3716.
[2] Romdhane, ben salma, The air solar collectors comparative study introduction of baffles to favor the heat transfer. Solar Energy 81 (2007) 139-149.
[3] Adnane Labed, Noureddine Moummi, Adel Benchabane, Kamel Aoues & Abdelhafid Moummi, Performance investigation of single- and double-pass solar air heaters through the use of various fin geometries. International Journal of Sustainable Energy, 30 (2011) 1-12
[4] Esen, H., Ozgen, F., Esen, M., Sengur, A., Modelling of a new solar air heater through least-squares support vector machines. Expert Systems Applications 36 (2009) 10673-10682.
[5] Ozgen, F., Esen, M., Esen, H., Experimental investigation of thermal performance of a double-flow solar air heater having aluminum cans. Renewable Energy 34 (2009) 2391-2398.6. W.B. Thompson, Kinetic Theory of Plasma, in M.N. Rosenbluth (ed.), Advanced Plasma Theory, chap. 1, Academic Press, New York, 1964.
[6] Omojaro AP, Aldabbagh LBY. Experimental performance of single and double pass solar air heater with fins and steel wire mesh as absorber. Apply Energy 87 (2010) 3759-3765.
[7] Choudhuri, C., Garg, H.P., Performance of air heating collectors with packed air flow passage. Solar Energy 50 (1993) 205-221.
[8] C. Choudhury, H.P. Garg, J. Prakash, Design studies of packed- bed solar air heaters. Energy Conversion and Management 34 (1993) 125- 138.
[9] Fahmy, M.F.M., Labib, A.M., Modeling and analysis of a matrix solar air heater. Energy Conversion and Management 31 (1991) 121-128.
[10] Sharma, V.K., Rizzi, G., Garg, H.P., Design and development of a matrix type solar air heater. Energy Conversion and Management 31 (1991) 379-388.
[11] Sodha, M.S., Bansal, N.K., Singh, D., Bhawadwaj, S.S., Performance of a matrix air heater. Journal of Energy 6 (1982) 334-339.
[12] Sahu MM, Bhagoria JL. Augmentation of heat transfer coefficient by using 90o broken transverse ribs on absorber plate of solar air heater. Renewable Energy 30 (2005) 2057-2073.
[13] Youcef-Ali, S., 2005. Study and optimization of the thermal performances of the offset rectangular plate fin absorber plates, with various glazing. Renewable Energy 31 (2005) 271-280.
[14] El-Sebaii AA, Aboul-Enein S, Ramadan MRI, El-Bialy E. Year round performance of double pass solar air heater with packed bed. Energy Convers Manage 48 (2007) 990-1003.
[15] Yeh HM, Ho CD. Effect of external recycle on the performances of flatplate solar air heaters with internal fins attached. Renew Energy 34 (2009) 1340-1347.
[16] Ozgen, F., Esen, M., Esen, H., Experimental investigation of thermal performance of a double-flow solar air heater having aluminum cans. Renewable Energy 34 (2009) 2391-2398.
[17] A. A. El. Sebaii, S. Aboul- Euein, M. R. I. Ramadan, S. M. Shalaby, B. M. Moharram, Thermal performance investigation of double passfinned plate solar air heater. Energy 88 (2011) 1727-1739.
[18] Omojaro AP, Aldabbagh LBY. Experimental performance of single and double pass solar air heater with fins and steel wire mesh as absorber. Apply Energy 87 (2010) 3759-3765.
[19] M.F. El-khawajah, L.B.Y. Aldabbagh, F. Egelioglu. The effect of using transverse fins on a double pass flow solar air heater using wire mesh as an absorber. Solar Energy 85 (2011) 1479-1487.
[20] S.B. Prasad, J.S. Saini, Krishna M. Singh, Investigation of heat transfer and friction characteristics of packed bed solar air heater using wire mesh as packing material. Solar Energy 83 (2009) 773-783.
[21] Bashria A, A. Yousef and Adam N. M, K Sopian, A. Zaharim and M. Alghoul, Analysis of single and double passes V-grooves solar collector with and without porous media. International Journal Of Energy And Environment 1 (2007) Issue 2.
[22] Sopian, K., Supranto, W.R.W., Daud, M.Y., Othman, B.Y., Thermal performance of the double-pass solar collector with and without porous media. Renewable Energy 18 (1999) 557-564.