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Analysis of the effect of eccentricity and operational parameters in PCM-filled single-pass shell and tube heat exchangers

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  • Pahamli, Younes
  • Hosseini, Mohammad J.
  • Ranjbar, Ali A.
  • Bahrampoury, Rasool

Abstract

In the present study, melting behavior of RT50 as a phase change material in a shell and tube heat exchanger is considered. Therefore the effects of parameters including a geometrical property (eccentricity) and flow specifications (mass flow rate and inlet temperature of heat transfer fluid) on different decisive parameters of the PCM are investigated. The selected parameters which are critical for every storage systems are liquid fraction, melting time and thermal storage performance. Enthalpy porosity method is used for the modeling of phase change process and pure conduction and natural convection are considered in the simulation. The differential governing equations are solve using SIMPLE algorithm in which momentum and energy equation are discretized employing QUICK differentiating scheme. The grid size and the time step were chosen after careful examination of the independency of the results to these parameters. The details of the process progression are presented via temperature contours and streamlines. The study declares that the initial stages as well as ending portion of melting process are dominated by weak mechanism of conduction. Results show that the average temperature of the PCM isn’t a function of eccentricity as long as there is solid PCM above the inner tube. Generally by increasing the eccentricity the rate of heat transfer and average temperature at the last stages of melting process increases. The Results indicated that although increasing eccentricity and inlet temperature of the heat transfer fluid influences the rate of heat transfer in the heat exchanger especially when both variations are considered simultaneously, mass flow rate does not leave such a significant impression on the rate even in eccentric cases.

Suggested Citation

  • Pahamli, Younes & Hosseini, Mohammad J. & Ranjbar, Ali A. & Bahrampoury, Rasool, 2016. "Analysis of the effect of eccentricity and operational parameters in PCM-filled single-pass shell and tube heat exchangers," Renewable Energy, Elsevier, vol. 97(C), pages 344-357.
    • Handle: RePEc:eee:renene:v:97:y:2016:i:c:p:344-357
    DOI: 10.1016/j.renene.2016.05.090
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    References listed on IDEAS

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    1. Tay, N.H.S. & Belusko, M. & Bruno, F., 2012. "Experimental investigation of tubes in a phase change thermal energy storage system," Applied Energy, Elsevier, vol. 90(1), pages 288-297.
    2. Tay, N.H.S. & Bruno, F. & Belusko, M., 2013. "Comparison of pinned and finned tubes in a phase change thermal energy storage system using CFD," Applied Energy, Elsevier, vol. 104(C), pages 79-86.
    3. Joulin, Annabelle & Younsi, Zohir & Zalewski, Laurent & Lassue, Stéphane & Rousse, Daniel R. & Cavrot, Jean-Paul, 2011. "Experimental and numerical investigation of a phase change material: Thermal-energy storage and release," Applied Energy, Elsevier, vol. 88(7), pages 2454-2462, July.
    4. Esapour, M. & Hosseini, M.J. & Ranjbar, A.A. & Pahamli, Y. & Bahrampoury, R., 2016. "Phase change in multi-tube heat exchangers," Renewable Energy, Elsevier, vol. 85(C), pages 1017-1025.
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    4. Ebrahimi, A. & Hosseini, M.J. & Ranjbar, A.A. & Rahimi, M. & Bahrampoury, R., 2019. "Melting process investigation of phase change materials in a shell and tube heat exchanger enhanced with heat pipe," Renewable Energy, Elsevier, vol. 138(C), pages 378-394.
    5. Pahamli, Y. & Hosseini, M.J. & Ranjbar, A.A. & Bahrampoury, R., 2018. "Inner pipe downward movement effect on melting of PCM in a double pipe heat exchanger," Applied Mathematics and Computation, Elsevier, vol. 316(C), pages 30-42.
    6. Mehdaoui, Farah & Hazami, Majdi & Messaouda, Anis & Taghouti, Hichem & Guizani, AmenAllah, 2019. "Thermal testing and numerical simulation of PCM wall integrated inside a test cell on a small scale and subjected to the thermal stresses," Renewable Energy, Elsevier, vol. 135(C), pages 597-607.
    7. Ali Motevali & Mohammadreza Hasandust Rostami & Gholamhassan Najafi & Wei-Mon Yan, 2021. "Evaluation and Improvement of PCM Melting in Double Tube Heat Exchangers Using Different Combinations of Nanoparticles and PCM (The Case of Renewable Energy Systems)," Sustainability, MDPI, vol. 13(19), pages 1-19, September.
    8. Jourabian, Mahmoud & Rabienataj Darzi, A. Ali & Akbari, Omid Ali & Toghraie, Davood, 2020. "The enthalpy-based lattice Boltzmann method (LBM) for simulation of NePCM melting in inclined elliptical annulus," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 548(C).
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