Optimization of melting time of solar thermal energy storage unit containing spring type heat transfer enhancer by Taguchi based grey relational analysis

2021 ◽  
pp. 103671
Author(s):  
Oğuz Kaan Çinici ◽  
Mehmet Emin Canlı ◽  
Ramazan Çakıroğlu ◽  
Adem Acır
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Melting Time ◽  
Solar Thermal Energy ◽  
Storage Unit ◽  
Energy Storage Unit ◽  
Relational Analysis ◽  
Spring Type ◽  
Grey Relational

scholarly journals Effect of the Quasi-Petal Heat Transfer Tube on the Melting Process of the Nano-Enhanced Phase Change Substance in a Thermal Energy Storage Unit

2021 ◽  
Vol 13 (5) ◽  
pp. 2871
Author(s):  
Mohammad Ghalambaz ◽  
Seyed Abdollah Mansouri Mehryan ◽  
Reza Kalantar Feeoj ◽  
Ahmad Hajjar ◽  
Obai Younis ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Capric Acid ◽  
Melting Time ◽  
Storage Unit ◽  
Energy Storage Unit ◽  
Petal Shape

The melting heat transfer of nano-enhanced phase change materials was addressed in a thermal energy storage unit. A heated U-shape tube was placed in a cylindrical shell. The cross-section of the tube is a petal-shape, which can have different amplitudes and wave numbers. The shell is filled with capric acid with a fusion temperature of 32 °C. The copper (Cu)/graphene oxide (GO) type nanoparticles were added to capric acid to improve its heat transfer properties. The enthalpy-porosity approach was used to model the phase change heat transfer in the presence of natural convection heat transfer effects. A novel mesh adaptation method was used to track the phase change melting front and produce high-quality mesh at the phase change region. The impacts of the volume fraction of nanoparticles, the amplitude and number of petals, the distance between tubes, and the angle of tube placements were investigated on the thermal energy rate and melting-time in the thermal energy storage unit. An average charging power can be raised by up to 45% by using petal shape tubes compared to a plain tube. The nanoadditives could improve the heat transfer by 7% for Cu and 11% for GO nanoparticles compared to the pure phase change material.

scholarly journals Evaluation of Heat Transfer Performance between Rock and Air in Seasonal Thermal Energy Storage Unit

2017 ◽  
Vol 142 ◽  
pp. 576-581 ◽  
Author(s):  
Leyla Amiri ◽  
Seyed Ali Ghoreishi-Madiseh ◽  
Agus P. Sasmito ◽  
Ferri P. Hassani
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Storage Unit ◽  
Energy Storage Unit

scholarly journals Effect of porous media on the heat transfer enhancement for a thermal energy storage unit

2018 ◽  
Vol 152 ◽  
pp. 984-989 ◽  
Author(s):  
Jiabang Yu ◽  
Ying Yang ◽  
Xiaohu Yang ◽  
Qiongxiang Kong ◽  
Liu Yanhua ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Energy Storage ◽  
Heat Transfer Enhancement ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Transfer Enhancement ◽  
Storage Unit ◽  
Energy Storage Unit

scholarly journals A Fast-Reduced Model for an Innovative Latent Thermal Energy Storage for Direct Integration in Heat Pumps

2021 ◽  
Vol 11 (19) ◽  
pp. 8972
Author(s):  
Valeria Palomba ◽  
Andrea Frazzica
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Pumps ◽  
Heat Transfer Fluid ◽  
Direct Integration ◽  
Storage Unit ◽  
Energy Storage Unit ◽  
Operating Modes

In the present paper, the numerical modeling of an innovative latent thermal energy storage unit, suitable for direct integration into the condenser or evaporator of a heat pump is presented. The Modelica language, in the Dymola environment, and TIL libraries were used for the development of a modular model, which is easily re-usable and adaptable to different configurations. Validation of the model was carried out using experimental data under different operating modes and it was subsequently used for the optimization of a design for charging and discharge. In particular, since the storage unit is made up of parallel channels for the heat transfer fluid, refrigerant, and phase change material, their number and distribution were changed to evaluate the effect on heat transfer performance.

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