Energetic and exergetic study of a flat plate collector based solar water heater - investigation of the absorber size





solar flat plate collector, absorber size, energy analysis, exergy analysis


Small sized absorber in a flat plate solar collector is beneficial in terms of cost and minimum heat losses. However, its detailed thermal performance compared to standard size collector is still not fully understood. There is a paucity of research to appreciate thermal performance of solar water heating collector with consideration of a small absorber size (below 1m2) and a standard absorber size (2 m2).  The present study attempts to investigate the energy and exergy efficiencies of flat plate solar water heating collector with two absorber plate areas (2 m2 and 0.74 m2) to enumerate size of the absorber required for improved first and second law thermal efficiencies of the collector. The efficiencies of these two collector designs are experimentally compared with the help of a test facility available in the site for given operating temperatures and rate of flow. The combined experimental uncertainty due to the measuring instruments and the measured parameters is also ascertained. The obtained results highlight the significance of the larger absorber size (2m2) for higher thermal efficiency, and lower absorber size (0.74m2) for higher exergetic efficiency. The highest thermal efficiency obtained is 77.38% for larger absorber size, and the highest exergy efficiency of 13.21% is obtained for lower absorber size collector. It is demonstrated that larger and lower absorber size of the collector have higher thermal efficiency and higher exergy efficiency, respectively, than some of the published works.


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Dutta D., Podder B., Biswas A. Solar Energy Potential of Silchar, Assam, India-A Resource Assessment. Advances in Optical Science and Engineering, Springer Proceedings in Physics. 2015; Vol. 166:119. DOI: https://doi.org/10.1007/978-81-322-2367-2_16

Duffie, J.A., Beckman, W.A. and Blair, N. Solar engineering of thermal processes, photovoltaics and wind. John Wiley & Sons.2020.

Kafle, B.P., Basnet, B., Timalsina, B., Deo, A., Malla, T.N., Acharya, N. and Adhikari, A. Optical, structural and thermal performances of black nickel selective coatings for solar thermal collectors. Solar Energy.2022; Vol.234:262-274. DOI: https://doi.org/10.1016/j.solener.2022.01.042

Herrera-Zamora, D.M., Lizama-Tzec, F.I., Santos-González, I., Rodríguez-Carvajal, R.A., García-Valladares, O., Arés-Muzio, O. and Oskam, G. Electrodeposited black cobalt selective coatings for application in solar thermal collectors: Fabrication, characterization, and stability. Solar Energy. 2022; Vol. 207:1132-1145. DOI: https://doi.org/10.1016/j.solener.2020.07.042

Liu, B., Wang, C., Bazri, S., Badruddin, I.A., Orooji, Y., Saeidi, S., Wongwises, S. and Mahian, O. Optical properties and thermal stability evaluation of solar absorbers enhanced by nanostructured selective coating films. Powder Technology.2021; Vol.377:939-957. DOI: https://doi.org/10.1016/j.powtec.2020.09.040

Reddy, J., Roy, S. and Das, B. Performance evaluation of sand coated absorber based solar air collector. Journal of Building Engineering.2021; Vol.44:102973. DOI: https://doi.org/10.1016/j.jobe.2021.102973

Babu J.S., Senthilvel S., Gregory F.P, Gopi T. Springer Proceedings in Energy, Adv. Energy Res. Vol. 2. Springer; 2020. Chapter 25, Investigations on improving the efficiency of solar air heater using extended surfaces; 261-272. DOI: https://doi.org/10.1007/978-981-15-2662-6_25

A.E. Kabeel, M.H. Hamed, Z.M. Omara, A.W. Kandeal. Influence of fin height on the performance of a glazed and bladed entrance single-pass solar air heater. Solar Energy. 2018; Vol. 162: 410-419. DOI: https://doi.org/10.1016/j.solener.2018.01.037

Kumar R., Chand P. Performance prediction of extended surface absorber solar air collector with twisted tape inserts. Solar Energy. 2018;Vol.169:40-8.. DOI: https://doi.org/10.1016/j.solener.2018.04.021

Saravanan A, Jaisankar S. Heat transfer augmentation techniques in forced flow V-trough solar collector equipped with V-cut and square cut twisted tape. International Journal of Thermal Sciences. 2019 ;Vol.140:59-70. DOI: https://doi.org/10.1016/j.ijthermalsci.2019.02.030

Vengadesan E., Senthil R. Experimental study on the thermal performance of a flat plate solar water collector with a bifunctional flow insert. Sustainable Energy Technologies and Assessments. 2022; Vol.50:101829. DOI: https://doi.org/10.1016/j.seta.2021.101829

Reddy J., Das B., Negi S. Energy, exergy, and environmental (3E) analyses of reverse and cross-corrugated trapezoidal solar air collectors: An experimental study. Journal of Building Engineering. 2021 ;Vol.41:102434. DOI: https://doi.org/10.1016/j.jobe.2021.102434

A.D. Tuncer, A. Khanlari, A. Sozen, E.Y. Gürbüz, C. Sirin, A. Gungor. Energy-exergy and enviro-economic survey of solar air heaters with various air channel modifications. Renew. Energy. 2020; Vol. 160: 67-85. DOI: https://doi.org/10.1016/j.renene.2020.06.087

Kabeel A.E., Hamed M.H., Omara Z.M., Kandel A.W. On the performance of a baffled glazed-bladed entrance solar air heater. Applied Thermal Engineering. 2018;Vol.139:367-75. DOI: https://doi.org/10.1016/j.applthermaleng.2018.04.141

Debnath S., Das B., Randive P. Energy and exergy analysis of plain and corrugated solar air collector: Effect of seasonal variation. International Journal of Ambient Energy. 2020; 1-12. DOI: https://doi.org/10.1080/01430750.2020.1778081

Jha P., Gupta R., Das B. Energy Metrics Assessment of a Photovoltaic Thermal Air Collector (PVTAC): A Comparison between Flat and Wavy Collector. EnergySources, Part A: Recovery, Utilization, and Environmental Effects. 2020; 1-19. DOI: https://doi.org/10.1080/15567036.2020.1809563

H.J. Jouybari, S. Saedodin, A. Zamzamian, M.E. Nimvari, S. Wongwises. Effects of porous material and nanoparticles on the thermal performance of a flat plate solar collector: an experimental study. Renewable Energy. 2017; Vol 114: 1407–1418. DOI: https://doi.org/10.1016/j.renene.2017.07.008

Hussien S.Q., Farhan A.A. The effect of metal foam fins on the thermohydraulic performance of a solar air heater. Int. J. Renew. Energy Resour. 2019; Vol. 9: 840-847.

Das B., Mondol JD., Debnath S., PugsleyA., Smyth M., Zacharopoulos A. Effect of the absorber surface roughness on the performance of a solar air collector: an experimental investigation. Renewable Energy. 2020; Vol 152: 567-572. DOI: https://doi.org/10.1016/j.renene.2020.01.056

Farhan A.A., M.Ali A.I, Ahmed H.E. Energetic and exergetic efficiency analysis of a v-corrugated solar air heater integrated with twisted tape inserts. Renewable Energy. 2021; Vol. 169: 1373-1385. DOI: https://doi.org/10.1016/j.renene.2021.01.109

Balaji K, Iniyan S., Swami M.V. Exergy, economic and environmental analysis of forced circulation flat plate solar collector using heat transfer enhancer in riser tube. Journal of Cleaner Production. 2017; Vol. 171: 1118-1127. DOI: https://doi.org/10.1016/j.jclepro.2017.10.093

Jafarkazemi F., Ahmadifard E. Energetic and exergetic evaluation of flat plate solar collectors. Renewable Energy. 2013; Vol. 56: 55-63. DOI: https://doi.org/10.1016/j.renene.2012.10.031

Gunjo D.G., Mahanta P., Robi P.S. CFD and experimental investigation of flat plate solar water heating system under steady state condition. Renewable Energy. 2017; Vol. 106: 24-36. DOI: https://doi.org/10.1016/j.renene.2016.12.041

Akram, N., Montazer, E., Kazi, S.N., Soudagar, M.E.M., Ahmed, W., Zubir, M.N.M., Afzal, A., Muhammad, M.R., Ali, H.M., Márquez, F.P.G., Sarsam, W.S. Experimental investigations of the performance of a flat-plate solar collector using carbon and metal oxides based nanofluids. Energy. 2021; Vol. 227:120452. DOI: https://doi.org/10.1016/j.energy.2021.120452

Farahat, S., Sarhaddi, F., Ajam, H. Exergetic optimization of flat plate solar collectors. Renewable Energy. 2009; Vol. 34: 1169–1174. DOI: https://doi.org/10.1016/j.renene.2008.06.014

Luminosu I, Fara L. Determination of the optimal operation mode of a flat solar collector by exergetic analysis and numerical simulation. Energy. 2005; Vol. 30: 731–747 DOI: https://doi.org/10.1016/j.energy.2004.04.061

Tong Y., Lee H., Kang W., Cho H. Energy and exergy comparison of a flat-plate solar collector using water, Al2O3 nanofluid, and CuO nanofluid. Journal of Applied Thermal Engineering. 2019; Vol 159: 113959. DOI: https://doi.org/10.1016/j.applthermaleng.2019.113959

Rostami S., Sepehrirad M., Dezfulizadeh A., Hussein A.K., Goldanlou A.S., Shadloo M.S. Exergy Optimization of a Solar Collector in Flat Plate Shape Equipped with Elliptical Pipes Filled with Turbulent Nanofluid Flow: A Study for Thermal Management. Water. 2020; Vol. 12(8): 2294 DOI: https://doi.org/10.3390/w12082294

D.G. Gunjo, P. Mahanta, P.S. Robi, Exergy and energy analysis of a novel type solar collector under steady state condition: experimental and CFD analysis. Renewable Energy. 2017; Vol. 114: 655–669. DOI: https://doi.org/10.1016/j.renene.2017.07.072

Sakhrieh, A., Al-Ghandoor, A. Experimental investigation of the performance of five types of solar collectors. Energy Conversion and Management. 2013; Vol. 65: 715–720. DOI: https://doi.org/10.1016/j.enconman.2011.12.038

Hashim WM, Shomran AT, Jurmut HA, Gaaz TS, Kadhum AA, Al-Amiery AA. Case study on solar water heating for flat plate collector. Case studies in thermal engineering. 2018;Vol.12:666-71. DOI: https://doi.org/10.1016/j.csite.2018.09.002

Alwan, N.T., Shcheklein, S.E. and Ali, O.M. Experimental analysis of thermal performance for flat plate solar water collector in the climate conditions of Yekaterinburg, Russia. Materials Today: Proceedings.2021; Vol. 42:2076-2083. DOI: https://doi.org/10.1016/j.matpr.2020.12.263




How to Cite

Chandra KA, Podder B, Das S, Biswas A. Energetic and exergetic study of a flat plate collector based solar water heater - investigation of the absorber size. EAI Endorsed Trans Energy Web [Internet]. 2024 Feb. 20 [cited 2024 Apr. 21];11. Available from: https://publications.eai.eu/index.php/ew/article/view/1350