Experimental Study on Solar Heat Battery using Phase Change Materials for Parabolic Dish Collectors

2021 ◽  
Vol 10 (4) ◽  
pp. 819-825
Author(s):  
Ramalingam Senthil ◽  
Inbaraj Infanta Mary Priya ◽  
Mukund Gupta ◽  
Chinmaya Rath ◽  
Nilanshu Ghosh
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Population Increase ◽  
Two Phase ◽  
Thermo Electric ◽  
Solar Heat ◽  
Complete Melting ◽  
Parabolic Dish ◽  
Present Design ◽  
Outdoor Test

Energy consumption has increased withthe population increase, and fossil fuel dependency has risen and causing pollutions. Solar energy is suitableto provide society's thermo-electric needs. Thermal energy storage-based concentrated solar receivers are aimed at store heat energy and transportable to the applications. Acavity receiver with two-phase change materials (PCM) is experimentally investigated using a parabolic dish collector to act as the solar heat battery. The selected PCMs are MgCl2.6H2O and KNO3-NaNO3. PCMs are chosen and placed as perthe temperature zones of the receiver. The outdoor test wasconductedto determine the conical receiver's storage performance using cascaded PCMs. The complete melting of PCM attainsat an average receiver surface temperature of 230°C. The complete melting of the PCM in the receiver took around 30 minutes at average radiation around 700 W/m2, and heat stored is approximately 5000 kJ. The estimated number of cavity receivers to be charged on a sunny day is about 10-15 according to the present design and selected PCMs, for later use

Phase Change Process Inside a Small-radii Cylinder Subjected to Cyclic Convective Boundary Conditions: a Numerical Study

2021 ◽  
Author(s):  
Yousef Kanani ◽  
Avijit Karmakar ◽  
Sumanta Acharya
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Convective Boundary Condition ◽  
Freezing Process ◽  
Fourier Number ◽  
Two Phase ◽  
Convective Boundary

Abstract We numerically investigate the melting and solidi?cation behavior of phase change materials encapsulated in a small-radii cylinder subjected to a cyclic convective boundary condition (square wave). Initially, we explore the effect of the Stefan and Biot numbers on the non-dimensionalized time required (i.e. reference Fourier number Tref ) for a PCM initially held at Tcold to melt and reach the cross?ow temperature Thot. The increase in either Stefan or Biot number decreases Tref and can be predicted accurately using a correlation developed in this work. The variations of the PCM melt fraction, surface temperature, and heat transfer rate as a function of Fourier number are reported and analyzed for the above process. We further study the effect of the cyclic Fourier number on the periodic melting and freezing process. The melting or freezing front initiates at the outer periphery of the PCM and propagates towards the center. At higher frequencies, multiple two-phase interfaces are generated (propagating inward), and higher overall heat transfer is achieved as the surface temperature oscillates in the vicinity of the melting temperature, which increases the effective temperature difference driving the convective heat transfer.

scholarly journals Conductive thermal diode based on two phase-change materials

2020 ◽  
Vol 153 ◽  
pp. 106393 ◽  
Author(s):  
Suraju Olawale Kasali ◽  
Jose Ordonez-Miranda ◽  
Karl Joulain
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Two Phase

scholarly journals Preparation of n-Alkane/Polycaprolactone Phase-Change Microcapsules via Single Nozzle Electro-Spraying: Characterization on Their Formation, Structures and Properties

2020 ◽  
Vol 10 (2) ◽  
pp. 561 ◽  
Author(s):  
Shengchang Zhang ◽  
Christine Campagne ◽  
Fabien Salaün
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
High Efficiency ◽  
Two Phase ◽  
Structures And Properties ◽  
The Matrix ◽  
Ft Ir ◽  
The Mean ◽  
Poly Caprolactone

The phase change microcapsule (mPCM) is one of the primary candidates in the fields of energy storage and thermal regulation. In this study, electro-spraying, as a green, high-efficiency electrohydrodynamic atomization technology, is applied to the microencapsulation of two phase change materials (PCM) (n-hexadecane and n-eicosane) with three loading contents (30%, 50%, and 70% by weight) in a polycaprolactone matrix. Ethyl acetate (EA) and chloroform (Chl) were chosen as solvents to prepare the working solutions. The objective of this study is to clarify the microencapsulation process during electro-spraying and to optimize the structure and properties of the electro-sprayed mPCM. The structures, morphologies, and thermal properties of the mPCM were characterized by optical microscopy (OM), scanning electron microscopy (SEM), differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), and fourier transform infrared spectroscopy (FT-IR). Electro-sprayed spherical and non-porous mPCM have been successfully prepared. The mean diameter and the particle size distribution depend mainly on the choice of the n-alkane, as well as the solvent used to prepare the working solutions. Meanwhile, the structure formation of electro-sprayed mPCM and the loading content of PCM were mainly influenced by the evaporation of the solvent and the phase separation between PCM and poly(caprolactone) (PCL) matrix. During the shell formation or PCL solidification, the control of the PCM leaching out of the matrix allows improving the loading content. Finally, based on a high latent heat and simple formation process, the electro-spraying route of PCM is a green, non-toxic, and high-efficiency direction for energy storage and heat regulation.

Preparation and Properties of Microencapsulated Phase Change Materials Containing Two-Phase Core Materials

2013 ◽  
Vol 52 (41) ◽  
pp. 14706-14712 ◽  
Author(s):  
He Wang ◽  
Jianping P. Wang ◽  
Xuechen Wang ◽  
Wei Li ◽  
Xingxiang Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Two Phase ◽  
Microencapsulated Phase Change Materials ◽  
Core Materials

TEST OF TWO PHASE CHANGE MATERIALS FOR THERMAL ENERGY STORAGE

2017 ◽  
Author(s):  
Luis Esteves ◽  
Ana Magalhaes ◽  
Victor Ferreira ◽  
Carlos Pinho
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Two Phase

Location and Thickness Effect of Two Phase Change Materials Between Layers of Roof on Energy Consumption for Air-Conditioned Room

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Hamid Hamza ◽  
Nisrine Hanchi ◽  
Bouchra Abouelkhayrat ◽  
Jawad Lahjomri ◽  
Abdelaziz Oubarra
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Materials ◽  
Temperature Drop ◽  
Cold Season ◽  
Comfort Level ◽  
Thickness Effect ◽  
Two Phase ◽  
Climate Effect

Thermal discomfort inside building is due to outside climate, especially by excessive solar radiation during summer or by temperature drop during a cold season. The use of phase change materials (PCMs) can reduce this effect by storing heat transmitted by sensible and latent heat. This ensures good situation of thermal comfort throughout the year. In this work, thermal behavior of two roofing systems is studied. One roof that is taken as reference is constituted by usual materials in building. In the second, two PCMs are inserted according to three configurations. The objective of the study is to assess incorporation effect of two PCMs within reference roof and to evaluate the optimum locations to reduce the energy consumption of air-conditioned room. A monodimensional numerical model, validated analytically and experimentally, is used to carry out a parametric analysis to determine the characteristics of the PCMs to be used and their optimal location within the reference roof regardless of the external climate effect. Numerical calculations are performed for three configurations of roof with swapping PCMs. Results show that insertion of PCMs in the roof provides the best energy consumption saving regardless of annual climate change. Reduction in energy consumption of an air-conditioned room depends on the combination of PCMs, their mutual thicknesses, and thermal comfort level.

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