Document Type : Research Article


Department of Mechanical Engineering, School of Engineering, University of Shahid Bahonar of Kerman, P. O. Box: 76169-14111, Iran.



In this research, the performance of an asphalt solar air collector was experimentally tested and the daily thermal and exergy efficiencies of the collector were analyzed. The sun's radiant energy is absorbed by asphalt and converted into thermal energy. Then, it is transmitted to aluminum pipes buried under the asphalt and, finally, to the air passing through the pipes. A suction fan induces the ambient air to the collector. The experimental results show that the daily thermal efficiencies at mass flow rates of 0.007 (kg/s) and 0.014 (kg/s) are 11.98% and 24.10% and daily exergy efficiencies are 0.34% and 0.66%, respectively, showing the increase in daily energy and exergy efficiencies with increasing the air mass flow rate. In addition, results show that as the flow rate increases, the outlet air temperature decreases. The presence of temperature difference between the inlet and outlet of the collector in the last hours of the day, when the sun's radiation is low, indicates that asphalt acts as a thermal energy storage medium.


Main Subjects

[1]   S. Gandjalikhan Nassab and M. Moein Addini, "Performance Augmentation of Solar Air Heater for Space Heating Using a Flexible Flapping Guide Winglet," Iranian (Iranica) Journal of Energy & Environment, vol. 12, no. 2, pp. 161-172, 2021.(
[2]   R. Daghigh and A. Shafieian, "Thermal performance of a double-pass solar air heater," Journal of Renewable Energy and Environment, vol. 3, no. 2, pp. 35-46, 2016.(
[3]   S. Nnamchi, O. Nnamchi, E. Sangotayo, S. Ismael, O. Nkurunziza, and V. Gabriel, "Design and simulation of air-solar preheating unit: An improved design of a flat plate solar collector," Iranian (Iranica) Journal of Energy & Environment, vol. 11, no. 2, pp. 97-108, 2020.(
[4]   R. O'Hegarty, O. Kinnane, and S. J. McCormack, "Concrete solar collectors for façade integration: An experimental and numerical investigation," Applied energy, vol. 206, pp. 1040-1061, 2017.(
[5]   O. Larsson and S. Thelandersson, "Estimating extreme values of thermal gradients in concrete structures," Materials and structures, vol. 44, no. 8, pp. 1491-1500, 2011.(
[6]   V. Bobes-Jesus, P. Pascual-Muñoz, D. Castro-Fresno, and J. Rodriguez-Hernandez, "Asphalt solar collectors: a literature review," Applied Energy, vol. 102, pp. 962-970, 2013.(
[7]   A. Chiarelli, A. Al-Mohammedawi, A. Dawson, and A. Garcia, "Construction and configuration of convection-powered asphalt solar collectors for the reduction of urban temperatures," International Journal of Thermal Sciences, vol. 112, pp. 242-251, 2017.(
[8]   E. H. Zaim, H. Farzan, and M. Ameri, "Assessment of pipe configurations on heat dynamics and performance of pavement solar collectors: An experimental and numerical study," Sustainable Energy Technologies and Assessments, vol. 37, p. 100635, 2020.(
[9]   A. P. Masoumi, E. Tajalli-Ardekani, and A. A. Golneshan, "Investigation on performance of an asphalt solar collector: CFD analysis, experimental validation and neural network modeling," Solar Energy, vol. 207, pp. 703-719, 2020.(
[10] H. Farzan, S. M. Jaafarian, and M. Ameri, "Experimental and Theoretical Investigation of Flow Rate Effect on Dynamic and Efficiency of Asphalt Solar Collector in Real Operating Condition," (in eng), Modares Mechanical Engineering, vol. 20, no. 5, pp. 1271-1282, 2020. [Online]. (
[11] H. Farzan, E. H. Zaim, and M. Ameri, "Study on effect of glazing on performance and heat dynamics of asphalt solar collectors: An experimental study," Solar Energy, vol. 202, pp. 429-437, 2020.(
[12] H. Saad, K. Kaddah, A. Sliem, A. Rafat, and M. Hewhy, "The effect of the environmental parameters on the performance of asphalt solar collector," Ain Shams Engineering Journal, vol. 10, no. 4, pp. 791-800, 2019.(
[13] S. J. Kline, "Describing uncertainty in single sample experiments," Mech. Engineering, vol. 75, pp. 3-8, 1953.(
[14] A. Kabeel, M. H. Hamed, Z. Omara, and A. Kandeal, "Influence of fin height on the performance of a glazed and bladed entrance single-pass solar air heater," Solar Energy, vol. 162, pp. 410-419, 2018.(
[15] S. A. Kalogirou, Solar energy engineering: processes and systems. Academic press, 2013.(
[16] M. Ameri, R. Sardari, and H. Farzan, "Thermal performance of a V-Corrugated serpentine solar air heater with integrated PCM: A comparative experimental study," Renewable Energy, vol. 171, pp. 391-400, 2021.(
[17] P. J. Pritchard and J. W. Mitchell, Fox and McDonald's introduction to fluid mechanics. John Wiley & Sons, 2016.(
[18] J. Coventry and K. Lovegrove, "Development of an approach to compare the ‘value’of electrical and thermal output from a domestic PV/thermal system," Solar Energy, vol. 75, no. 1, pp. 63-72, 2003.(
[19] R. Petela, "Exergy of undiluted thermal radiation," Solar energy, vol. 74, no. 6, pp. 469-488, 2003.(
[20] S. A. Kalogirou, S. Karellas, K. Braimakis, C. Stanciu, and V. Badescu, "Exergy analysis of solar thermal collectors and processes," Progress in Energy and Combustion Science, vol. 56, pp. 106-137, 2016.(
[21] J. P. Holman, Heat transfer. McGraw-hill, 1986.(
[22] M. Gholampour and M. Ameri, "Energy and exergy analyses of Photovoltaic/Thermal flat transpired collectors: Experimental and theoretical study," Applied energy, vol. 164, pp. 837-856, 2016.(