Thermohydraulic Performance of Double Flow Solar Air Heater with Corrugated Absorber
This paper deals with the analytical investigation of thermal and thermohydraulic performance of double flow solar air heaters with corrugated and flat plate absorber. A mathematical model of double flow solar air heater has been presented, and a computer program in C++ language is developed to estimate the outlet temperature of air for the evaluation of thermal and thermohydraulic efficiency by solving the governing equations numerically using relevant correlations for heat transfer coefficients. The results obtained from the mathematical model is compared with the available experimental results and it is found to be reasonably good. The results show that the double flow solar air heaters have higher efficiency than conventional solar air heater, although the double flow corrugated absorber is superior to that of flat plate double flow solar air heater. It is also observed that the thermal efficiency increases with increase in mass flow rate; however, thermohydraulic efficiency increases with increase in mass flow rate up to a certain limit, attains the maximum value, then thereafter decreases sharply.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131465Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 907
 Ho-Ming Yeh, Chii-Dong Ho, Jun-Ze Hou, “The improvement of collector efficiency in solar air heaters by simultaneously air flow over and under the absorbing plate,” Energy, vol. 24, pp. 857-71, 1999.
 Wenxian Lin, Wenfeng Gao, Tao Liu, “A parametric study on the thermal performance of cross corrugated solar air collectors,” Applied Thermal Engineering, vol. 26, pp. 1043-53, 2006.
 Wenfeng Gao, Wenxian Lin, Tao Liu, “Analytical and experimental studies on the thermal performance of cross corrugated and flat pate solar air heaters,” Applied Energy, vo. 84, pp. 425-41, 2007.
 Paisarn Naphon, “Effect of porous media on the performance of the double pass flat plate solar air heater,” International Communications in Heat and Mass Transfer, vol. 32, pp. 140-50, 2005.
 Stasiek JA., “Experimental studies of heat transfer and fluid flow across corrugated-undulated heat exchanger surfaces,” International Journal of Heat and Mass Transfer,” vol. 41, pp. 899-914, 1998.
 Chouksey Vimal Ku., Sharma SP., “Investigations on thermal performance characteristic of wire screen packed bed solar air heater,” Solar Energy, vol. 132, pp. 591-605, 2016.
 Taymaz I., Koc I., Islamoglu Y., “Experimental study on forced convection heat transfer characteristics in a converging diverging heat exchanger channel,” Heat Mass Transfer, vol. 44, pp. 1257-62, 2008.
 Fabbri G., “Heat transfer optimization in corrugated wall channels,” International Journal of Heat and Mass Transfer, vol. 43, pp. 4299-4310, 2000.
 Naphon P., “Heat transfer characteristics and pressure drop in channel with V-corrugated upper and lower plates,” Energy Conversion and Management, vol. 48, pp. 1516-24, 2007.
 Piao Y, Hauptmann EG, Iqbal M., “Forced convective heat transfer in cross-corrugated solar air heaters,” Transactions of the ASME. Journal of Solar Energy Engineering, vol. 116, pp. 212-14, 1994.
 Piao Y., “Natural, forced and mixed convection in a vertical cross-corrugated channel,” M. Sc. Thesis, The University of British Columbia, Canada, 1992.
 Noorshahi S, Hall CA, Glakpe EK., “Natural convection in a corrugated enclosure with mixed boundary conditions,” Transactions of the ASME. Journal of Solar Energy Engineering, vol. 118, pp. 50-57, 1996.
 Gao WF., “Analysis and performance of a solar air heater with cross corrugated absorber and back-plate,” M. Sc. Thesis, Yunnan Normal University, China, 1996.
 Gao WF, Lin WX, Lu E., “Numerical study on natural convection inside the channel between the flat-plate cover and sine-wave absorber of a cross-corrugated solar air heater,” Energy Conversion and Management, vol. 41, pp. 145-51, 2000.
 Saha. S.N., and Sharma S.P., “Analysis of thermohydraulic performance of double flow v-corrugated absorber solar air heater,” International Energy Journal, vol. 16, pp. 131-142, 2016.
 Klein, S.A., “Calculation of flat plate loss coefficients,” Solar energy, vol. 17, pp. 79-80, 1975.
 McAdams, W.H., Heat transmission. New York: McGraw-Hill, 1954.
 Hottel, H.C. and Woertz, B.B., “Performance of flat plate solar heat collectors,” Trans ASME, vol. 64, pp. 91-104, 1942.
 Karim, M.A., Perez, E. and Amin, Z.M., “Mathematical modelling of counter flow v-grove solar air collector, Renewable Energy, vol. 67, pp. 192-201, 2014.
 Hollands, K.G.T. and Shewen, E.C., “Optimization of flow passage geometry for air heating plate type solar collectors,” ASME J Solar Energy Eng, vol. 103, pp. 323-30, 1981.
 Heaton, H.S., Reynolds, Wc. and Kays, W.M., “Heat transfer in annular passages. Simultaneous development of velocity and temperature fields in laminar flow,” Int J Heat Mass Transfer, vol. 7, pp. 763-81, 1964.
 Kays, W.M., Convective heat and mass transfer. New York: McGraw Hill, 1980.
 Ahmad, A., Saini, J.S. and Varma, H.K., “Thermohydraulic performance of packed bed solar air heaters,” Energy Convers, vol. 37, pp. 205-214, 1996.
 Bahrehmand, D., Ameri, M. and Gholampour, M., “Energy and exergy analysis of different solar air collector systems with forced convection,” Renewable Energy, vol. 83, pp. 1119-1130, 2015.
 Wong, H.Y., Handbook of essential formula and data on heat transfer for engineers, London: Longman, 1977.
 Choudhury, C., Andersen, S.L. and Pekstad, J., “A solar air heater for low temperature applications,” Solar Energy, vol. 40, pp. 77, 1988.
 Tan, H.M. and Charters, W.W.S., “Effect of thermal entrance region on turbulent forced convective heat transfer for an asymmetrically heated rectangular duct with uniform heat flux,” Solar Energy, vol. 12, pp. 513, 1969.
 Douglas, J.F., Gasiorek, J.M. and Swaffield, J.A., Fluid mechanics. 2nd ed. England: Longman Singapor Publishers, 1992.
 Hegazy, A.A., “Thermohydraulic performance of air heating solar collectors with variable width, flat absorber plates,” Energy Convers Manage, vol. 41, pp. 1361-78, 2000.
 Griggs, E.I. and Sharifabad, F.K., “Flow characteristics in rectangular ducts,” ASHRAE Trans, vol. 98(1), pp. 116-27, 1992.
 El-Sebaii, A.A., Aboul-Enein, S., Ramadan, M.R.I., Shalaby, S.M. and Moharram, B.M., “Investigation of thermal performance of double pass flat and v-corrugated plate solar air heaters,” Energy, vol. 36, pp. 1076-1086, 2011.