CFD Analysis of Heat Transfer Enhancement in a Flat-Plate Solar Collector with Different Geometric Variations in the Superficial Section

William Quitiaquez, José Estupinán-Campos, César Nieto-Londoño, C.A. Isaza-Roldán, Patricio Quitiaquez, Fernando Toapanta-Ramos


Nowadays, there is an increasing need for improving the inefficient ways for obtaining thermal energy from renewable sources to fulfil the industrial and typical needs in heat transfer processes that may be covered using solar assisted heat pumps due to their appropriate performance in the thermal energy transfer process. To improve the efficiency of the collector/evaporator by increasing the heat flux to the refrigerant, in this research, a numerical and computational fluid dynamics (CFD) analysis is conducted with geometrical variations in the surface section of a collector/evaporator. The performance was compared to the results of a base case, replicating its limit and environmental conditions such as the initial temperature of 5.5 °C, incident solar radiation of 464.1 W·m-2, the operating temperature of 17.6 °C and other parameters. The surface geometrical variations involved in this study show a surface area similar to the base case. However, different lengths of the fluid path were considered due to the new geometrical shapes represented with less thermal resistances and correct distribution of the fluid in the collector/evaporator, obtaining temperature variations of 3.78, 5.47, 5.56 °C and a maximum value of 5.63 °C, including the corresponding variation of the heat flux. Considering the geometric changes in the superficial section of a flat-plate solar collector, it is possible to implement these variations in different kinds of heat exchangers in order to analyze the efficiency in these devices and the impact in the global systems where the heat exchangers are used.


Energy; heat; surface section; efficiency; temperature.

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Z. Badiei, M. Eslami, and K. Jafarpur, “Performance improvements in solar flat plate collectors by integrating with phase change materials and fins: A CFD modeling,” Energy, vol. 192, 2020.

S. Vaishak and P. V. Bhale, “Photovoltaic/thermal-solar assisted heat pump system: Current status and future prospects,” Sol. Energy, vol. 189, no. November 2018, pp. 268–284, 2019.

L. Evangelisti, R. De Lieto Vollaro, and F. Asdrubali, “Latest advances on solar thermal collectors: A comprehensive review,” Renew. Sustain. Energy Rev., vol. 114, no. August, 2019.

F. Gorozabel Chata and T. Carbonell Morales, “Diseños experimentales aplicados a una bomba de calor de expansión directa con energía solar,” Ing. Mecánica, vol. 20, no. 2, pp. 160–168, 2018.

W. Ji, J. Cai, J. Ji, and W. Huang, “Experimental study of a direct expansion solar-assisted heat pump (DX-SAHP) with finned-tube evaporator and comparison with conventional DX-SAHP,” Energy Build., vol. 207, 2020.

H. M. C. Bastos, P. J. G. Torres, and C. E. Castilla Álvarez, “Numerical simulation and experimental validation of a solar-assisted heat pump system for heating residential water,” Int. J. Refrig., vol. 86, pp. 28–39, 2018.

L. Zhou, Y. Wang, and Q. Huang, “CFD investigation of a new flat plate collector with additional front side transparent insulation for use in cold regions,” Renew. Energy, vol. 138, pp. 754–763, 2019.

H. N. Panchal and N. Patel, “ANSYS CFD and experimental comparison of various parameters of a solar still,” Int. J. Ambient Energy, vol. 39, no. 6, pp. 551–557, 2018.

C. Abeykoon, “Compact heat exchangers – Design and optimization with CFD,” Int. J. Heat Mass Transf., vol. 146, 2020.

K. Ma, Z. Wang, X. Li, P. Wu, and S. Li, “Structural optimization of collector/evaporator of direct-expansion solar/air-assisted heat pump,” Alexandria Eng. J., vol. 60, no. 1, pp. 387–392, 2021.

M. R. Saffarian, M. Moravej, and M. H. Doranehgard, “Heat transfer enhancement in a flat plate solar collector with different flow path shapes using nanofluid,” Renew. Energy, vol. 146, pp. 2316–2329, 2020.

J. Yao, S. Zheng, D. Chen, Y. Dai, and M. Huang, “Performance improvement of vapor-injection heat pump system by employing PVT collector/evaporator for residential heating in cold climate region,” Energy, vol. 219, 2021.

W. Quitiaquez et al., “Analysis of the thermodynamic performance of a solar-assisted heat pump using a condenser with recirculation,” Energía, vol. 16, no. 2, pp. 111–125, 2020.

W. Quitiaquez, J. Estupinan-Campos, C. A. Isaza-Roldan, C. Nieto-Londono, P. Quitiaquez, and F. Toapanta-Ramos, “Numerical simulation of a collector/evaporator for direct-expansion solar-assisted heat pump,” 2020 Ieee Andescon, Andescon 2020, 2020.

W. Quitiaquez, J. Estupiñan-Campos, C. A. Isaza Roldán, F. Toapanta-Ramos, and A. Lobato-Campoverde, “Análisis numérico de un sistema de calentamiento de agua utilizando un colector solar de placa plana,” Ingenius, no. 24, pp. 97–106, 2020.

H. Shi, M. Li, P. Nikrityuk, and Q. Liu, “Experimental and numerical study of cavitation flows in venturi tubes: From CFD to an empirical model,” Chem. Eng. Sci., vol. 207, pp. 672–687, 2019.

T. Luo, C. Yu, R. Liu, M. Li, J. Zhang, and S. Qu, “Numerical simulation of LNG release and dispersion using a multiphase CFD model,” J. Loss Prev. Process Ind., vol. 56, no. August 2017, pp. 316–327, 2018.

A. Aghagoli and M. Sorin, “Thermodynamic performance of a CO2 vortex tube based on 3D CFD flow analysis,” Int. J. Refrig., vol. 108, pp. 124–137, 2019.

Z. Wang and M. Liu, “Semi-resolved CFD–DEM for thermal particulate flows with applications to fluidized beds,” Int. J. Heat Mass Transf., vol. 159, 2020.

W. M. Duarte, T. F. Paulino, J. J. G. Pabon, S. Sawalha, and L. Machado, “Refrigerants selection for a direct expansion solar assisted heat pump for domestic hot water,” Sol. Energy, vol. 184, no. April, pp. 527–538, 2019.

M. Granda, M. Trojan, and D. Taler, “CFD analysis of steam superheater operation in steady and transient state,” Energy, vol. 199, 2020.

D. W. Theobald, B. Hanson, M. Fairweather, and P. J. Heggs, “Implications of hydrodynamics on the design of pulsed sieve-plate extraction columns: A one-fluid multiphase CFD model using the volume of fluid method,” Chem. Eng. Sci., vol. 221, 2020.



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