Journal ArticleDOI
Experimental investigation of phase change in a multitube heat exchanger
TLDR
In this paper, the melting and solidification processes in a multitube heat exchanger were investigated and the thermal characteristics of the units involving melting front, heat transfer rate and Nusselt number were also analyzed.Abstract:
The present paper investigates melting and solidification processes in a multitube heat exchanger. The shell side is filled with paraffin (RT35) while water flows through the tube passes as the heat transfer fluid (HTF). The arrangements of one, two, three and four inner tubes cases are studied for HTF inlet temperatures of 70 °C, 75 °C and 80 °C. The thermal characteristics of the units involving melting front, heat transfer rate and Nusselt number are also analyzed. Results indicate that increasing the number of inner tubes results in a faster pace of melting and solidification. The effect is so pronounced that, when the HTF inlet temperature is 80 °C, application of 4-tube heat exchanger reduces the duration required for complete melting and solidification up to 43 and 50 percent, respectively as compared to the corresponding single-HTF-tube case. The results also show that by increasing the number of tubes, the surface-averaged Nusselt number decreases. This can be attributed to the inhibition of upper pipes against PCM melt movement. Also a correlation is proposed to calculate Nusselt number of tubes. Comparing the temperatures recorded by the thermocouples in rotational direction, it is indicated that the variation of the inner tube arrangement affects solidification process more than melting.read more
Citations
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Journal ArticleDOI
Melting performance enhancement of PCM based thermal energy storage system using multiple tubes and modified shell designs
TL;DR: In this article, experimental and numerical investigations are performed for heat transfer enhancement in a horizontal Latent Thermal Energy Storage System using multiple heat transfer tubes and modified shell designs, where Stearic acid is used as phase change material and it is placed in the annulus of steel shell and copper tubes carrying water as the heat transfer fluid.
Journal ArticleDOI
Investigation on the energy performance of using air-source heat pump to charge PCM storage tank
TL;DR: In this article, the authors investigated the relationship between the charge water flowrate and the charging completion time and the total energy use and evaluated quantitatively using case studies, according to which optimal water flow rate was identified.
Journal ArticleDOI
Energy and exergy analysis of an experimentally examined latent heat thermal energy storage system
TL;DR: In this article, an experimental investigation is carried out on a Latent Heat Thermal Energy Storage system (LHTES). All the experimental data are optimized using thermodynamic principles in which exergy analysis is conducted to examine the system performance at different time constants.
Journal ArticleDOI
A numerical study on the effect of the number and arrangement of tubes on the melting performance of phase change material in a multi-tube latent thermal energy storage system
TL;DR: In this paper, the effect of the number and arrangement of tubes on the melting performance of a phase change material (PCM) in a multi-tube shell-and-tube latent heat thermal energy storage (LHTES) system was numerically investigated.
Journal ArticleDOI
Numerical investigation of PCM melting using different tube configurations in a shell and tube latent heat thermal storage unit
TL;DR: In this paper, three inner tubes of heat transfer fluid were employed with four different arrangements: inline-central array (normal case, Case A), downward and upward triangle arrays (Case B and C), and an arc array at the shell bottom (Case D).
References
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Journal ArticleDOI
A comparative study of thermal behaviour of a horizontal and vertical shell-and-tube energy storage using phase change materials
TL;DR: In this paper, thermal behavior in a vertical and horizontal shell-and-tube energy storage system using phase change materials (PCMs) is investigated and compared using a combined conduction and convection heat transfer model.
Journal ArticleDOI
Experimental and computational evolution of a shell and tube heat exchanger as a PCM thermal storage system
TL;DR: In this article, a combined experimental and numerical study has been designed to study thermal behavior and heat transfer characteristics of Paraffin RT50 as a phase change material (PCM) during constrained melting and solidification processes inside a shell and tube heat exchanger.
Journal ArticleDOI
A numerical method for PCM-based pin fin heat sinks optimization
TL;DR: In this paper, a numerical investigation on geometric optimization of PCM-based pin fin heat sinks is presented, where Paraffin RT44HC is used as PCM while the fins and heat sink base is made of aluminum.
Journal ArticleDOI
Experimental and numerical evaluation of longitudinally finned latent heat thermal storage systems
TL;DR: In this article, the effect of longitudinal fins in a double-pipe heat exchanger containing PCM is examined during charging process, where eight rectangular fins are mounted around the HTF (heat transfer fluid) carrying tube.
Journal ArticleDOI
Phase change in multi-tube heat exchangers
TL;DR: In this paper, the effect of number of inner tubes as a geometrical parameter during charging process was investigated and the consequences of increasing operational parameters including the HTF mass flow rate and inlet temperature were studied.