Electromechanical Engineering Dept.,University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.


It is well known that photovoltaic (PV) can be connected in parallel, series, and parallel series. In this study, four PV panels are connected in four different ways, i.e., 4panels parallel (4p), 3panels parallel*1panel series (3p*1s), 2panels parallel*2panels parallel (2p*2p) connected in series, and 2panels series *2panels series (2s*2s) connected in parallel, to determine the best PV panels configuration for supplying DC power to the Variable Speed Compressor (VSC) with the highest average exergy efficiency and minimum exergy losses under sunny daylight hours. Experimental data is used to calculate the exergy efficiency of the mentioned configurations. The best results are delivered by (2p*2p) configuration with average exergy efficiency of 43.77% and exergy efficiency of 88.05%. Whereas the percentage of improvement for the average exergy efficiency of this configuration compared with the (2s*2s), (4p), and (3p*1s) are (55.93%), (63.69%) and (78.9%) respectively.


  • The average exergy efficiency of the case 2p*2p compared with case 2s*2s was55.9%.
  • The average exergy efficiency of the case 2p*2p compared with case 4p was63.69%.
  • The average exergy efficiency of the case 2p*2p compared with case 3p*1s was78.9%.


Main Subjects

[1] A. Shukla, K. Kant, A. Sharma, and P. H. Biwole, Cooling methodologies of photovoltaic module for enhancing electrical efficiency: A review, Solar Energy Materials and Solar Cells, 160 (2017) 275–286.
[2] S. Deshmukh and S. Kalbande, Performance Evaluation of Photovoltaic System Designed for DC Refrigerator, Int. J. Sci. Res., 4 (2015) 18–23, [Online]. Available:
[3] K. Sudhakar and T. Srivastava, Energy and exergy analysis of 36 W solar photovoltaic module, Int. J. Ambient Energy, 35 (2014) 51–57, doi: 10.1080/01430750.2013.770799.
[4] A. Shukla, M. Khare, and K. N. Shukla, Experimental Exergetic Performance Evaluation of Solar PV Module, Int. J. Sci.Res. Publ., 5 (2015) 1–9, [Online]. Available:
[5] M. B. Özalp, Mehmet, A comparative thermodynamic analysis on different exergetic efficiency methods for a solar photovoltaic module, Int. J. Exergy, 24 (2017) 325–343.
[6] P. R. Prommas, Ratthasak, Sahachai Phiraphat, Energy and exergy analyses of PV roof solar collector, Int. J. Heat Technol., 37 (2019) 303–312.
[7] T. J. Kotas, The exergy method of thermal plant analysis, Elsevier, 2013.
[8] K. F.Wong, Thermodynamics for engineers, CRC Press LLC.
[9] R. Petela, An approach to the exergy analysis of photosynthesis, Sol. Energy, 82 (2008) 311–328, doi: 10.1016/j.solener.2007.09.002.
[10] R. Petela, Exergy of undiluted thermal radiation, Sol. Energy, 74 (2003) 469–488.
[11] H. Farahat, S., Sarhaddi, F. and Ajam, Exergetic optimization of flat plate solar collectors, Renew. Energy, 3492009) 1169–1174.
[12] S. F. and F. S. H. Ajam, Exergetic Optimization of Solar Air Heaters and Comparison with Energy Analysis, Int. J. Thermodyn., 8 (2005) 183–190.
[13] C. P. U. Jones, A. D., A modelling method for building-integrated photovoltaic power supply, Build. Serv. Eng. Res. Technol., 23 (2015) 167–177.