Electromechanical Eng. Dep., University of Technology, Baghdad, Iraq.


Novel techniques to enhance thermal performance using a helical coil receiver tube and Nano-fluid materials are presented in this paper. Two different applied techniques to enhance thermal performance are used as a new application on parabolic trough solar collector (PTSC). In the present work, PTSC has been fabricated using Dioxide Silicon SiO2 with an average particle size of 40nm by taking volume fraction of SiO2 0.1, 0.2 and 0.3%. Distilled water based Nano-fluid as a working fluid and a helical coil receiver tube were used in this paper. Varying the flow rate of Nano-fluids 100,150 and 200l/h are used, respectively. A solar tracking mechanism experimentally has been used with the PTSC. As per ASHRAE standard, the experimental results showed that at volume fraction 0.3 % and flow rate of 200 l/h, the highest increase in the energy absorbed factor FR(τα) was 14.6 % and energy removal factor FRUL was 29.4 % compared with distilled water. The changes in FR(τα) vary from 11.8% to 14.6% while in FRUL, they vary from 20.5% to 29.4% as compared with the distilled water case. The maximum efficiency was about 76.6 % as the heat loss parameter [(Ti–Ta)/GT] =0 at a volume fraction of 0.3 % and the flow rate of 200 l/h.


[1] R. Loni, E. AskariAsli-ardeh, B. Ghobadian, A.B. Kasaeian, Sh. Gorjian, “Thermodynamic analysis of a solar dish receiver using different Nano fluids,” Energy, vol. 133,pp. 749-760, 2017.
[2] A. G. Fernandez, H. Galleguillos, E. Fuentealba, F. J. Perez, “Thermal characterization of HITEC molten salt for energy storage in solar linear concentrated technology,” Journal of Thermal Analysis and Calorimetry , vol. 5, no. 122-1, pp. 3-9, 2015.
[3] E. Mathioulakis, E. Papanicolaou, V. Belessiotis, “Optical performance and instantaneous efficiency calculation of linear Fresnel solar collectors,” International Journal of Energy Research, pp. 1-15, 2017.
[4] E. Bellos, C. Tzivanidis, A. Papadopoulos, “Enhancing the performance of a linear Fresnel reflector using Nano fluids and internal finned absorber,” Journal of Thermal Analysis and Calorimetry, 2018.
[5] W. Fuqiang, C. Ziming, T. Jianyu, Y. Yuan, S. Yong, L. Linhua, “Progress in concentrated solar power technology with parabolic trough collector system: A comprehensive review,” In Renewable and Sustainable Energy Reviews, vol. 79, pp. 1314-1328, 2017.
[6] H.M. Sandeep, U.C. Arunachala, “Solar parabolic trough collectors: A review on heat transfer augmentation techniques,” Renewable and Sustainable Energy Reviews, vol. 69, pp. 1218-1231, 2017.
[7] Z. Huang, Z.-Y. Li, G.-L.Yu, W.-Q. Tao,” Numerical investigations on fully developed mixed turbulent convection in dimpled parabolic trough receiver tubes,” Applied Thermal Engineering, vol. 114, pp. 1287-1299, 2017.
[8] G. Xiangtao, W. Fuqiang, W. Haiyan, T. Jianyu , L. Qingzhi, H. Huaizhi, “Heat transfer enhancement analysis of tube receiver for parabolic trough solar collector with pin fin arrays inserting,” Solar Energy, vol. 144, pp. 185-202, 2017.
[9] E. Bellos, C. Tzivanidis, D. Tsimpoukis, “Multi-criteria evaluation of parabolic trough collector with internally finned absorbers,” Applied Energy, vol. 205, pp. 540-561, 2017.
[10] A. Mwesigye, T. Bello-Ochende, J.P. Meyer, “Heat transfer and entropy generation in a parabolic trough receiver with wall-detached twisted tape inserts,” International Journal of Thermal Sciences, vol. 99, pp. 238-257, 2016.
[11] B. Bhanvase, S.D. Sayankar, A. Kapre, P.J. Fule,S.H. Sonawane, “Experimental investigation on intensified convective heat transfer coefficient of water based PANI Nano fluid in vertical helical coiled heat exchanger,” Applied Thermal Engineering, vol. 128, pp. 134–140, 2018.
[12] M. Bahiraei, RezaRahmani, Ali Yaghoobi, Erfan Khodabandeh, Ramin Mashayekhi, Mohammad Amani, “Recent research contributions concerning use of nanofluids in heat exchangers: A critical review,” Applied Thermal Engineering, vol. 133, no. 137, pp. 137–159, 2018.
[13] S. Kumar, K Vasudev Karanth, “Numerical analysis of a helical coiled heat exchanger using CFD,” Int. Journal of Thermal Technologies, vol.3, pp. 126-130, 2013.
[14] A. Alimoradi, “Study of thermal effectiveness and its relation with NTU in shell and helically coiled tube heat exchanger,” Elsevier Case Studies in Thermal Engineering, vol.9, pp. 100–107, 2017.
[15] R. Gupta, S. Kalmegh, P. Warghade, K. Padghan ,“Experimental study on helical tube heat exchanger by varying cross section using nanoParticles,” IRJET, vol.5, 6, pp. 2746-2749, 2018.
[16] S. U. Choi, J. Eastman, “Enhancing thermal conductivity of fluids with nanoparticles,” Argonne National Lab, IL (United States), 1995.
[17] O. Mahian, A. Kianifar, A.Z. Sahin, S. Wongwises, “Entropy generation during Al2O3/water nano fluid flow in a solar collector: effects of tube roughness, nanoparticle size, and different thermophysical models,” Int. Journal of Heat and Mass Transfer, vol. 78, pp. 64-75, 2014.
[18] K. Sunil, L. Kundan, S. Sumeet, “Performance evaluation of a Nano fluid based parabolic solar collector-an experimental study,” In Proceedings of twelfth IRF international conference, Chennai, India, pp. 29–35, 2014.
[19] S. Chaudhari, P. V. Walke, U. S. Wankhede, R. S. Shelke, “An experimental investigation of a nano fluid (Al2O3+H2O) based parabolic trough solar collectors,” Br. J. Appl. Sci. Technol. vol. 9, pp. 551–557, 2015.