A detailed heat transfer study on Al2O3/Paraffin wax as a PCM with different shape of thermal energy storage compartment

2020 ◽  
pp. 1-4
Author(s):  
T. R. Heera
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Paraffin Wax ◽  
Storage Compartment ◽  
Transfer Study

Experimental Investigation on Enhancement of Heat Transfer in Thermal Energy Storage System Using Paraffin Wax as PCM

2015 ◽  
Vol 766-767 ◽  
pp. 457-462 ◽  
Author(s):  
N. Beemkumar ◽  
A. Karthikeyan
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Paraffin Wax ◽  
Maximum Heat ◽  
Transfer Rates ◽  
Thermal Energy Storage System

An experimental study is conducted to investigate heat transfer enhancement in Thermal Energy Storage system (TES) with paraffin wax as a Phase Change Material (PCM). Therminol 66 is used as a heat transfer fluid (HTF) to carry the heat throughout circuit. The PCM is encapsulated in spherical shells which is stored in the storage tank. The work includes study of heat transfer rates between HTF and PCM with different encapsulation materials namely Copper, Aluminium and Brass. A series of experiments were conducted to investigate the time required and heat transfer rates of HTF during the processes of charging and discharging of the PCM. Experimentally, Copper was found to have the maximum heat transfer rate and Brass was found to have the least cost/kW of energy stored. In discharging process, the cumulative heat gained by HTF from the brass encapsulated PCM is higher (1419.8 kJ) than aluminium (1199.96 kJ) and copper (815.24 kJ). Thus it can be concluded the brass is the most economical encapsulating material for enhancing the heat transfer in a thermal storage system than copper. The heat transfer from the HTF to PCM occurs in copper are 4.9% faster when compared to Brass and 2.3% faster than Aluminum encapsulation. On the other hand, The cost per kW energy transfer from the different encapsulated materials proves that the brass is cost effective during both charging and discharging process.

scholarly journals PENGGUNAAN PARAFFIN WAX SEBAGAI PENYIMPAN KALOR PADA PEMANAS AIR TENAGA MATAHARI THERMOSYPHON

ROTASI ◽  
2016 ◽  
Vol 18 (3) ◽  
pp. 76 ◽  
Author(s):  
Muhammad Nadjib
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Paraffin Wax ◽  
Heat Transfer Fluid ◽  
Sensible Heat ◽  
Latent Heat Storage ◽  
Change Material

Pemanas Air Tenaga Matahari (PATM) konvensional umumnya menggunakan air sebagai penyimpan energi termal. Pemakaian sensible heat storage (SHS) ini memiliki kekurangan, diantaranya adalah densitas energinya rendah. Di sisi lain, latent heat storage (LHS) mempunyai sifat khas yaitu densitas energinya tinggi karena melibatkan perubahan fasa dalam penyerapan atau pelepasan kalor. Material LHS sering disebut phase change material (PCM). Penggunaan PCM pada PATM menarik dilakukan untuk meningkatkan densitas energi sistem. Penelitian ini bertujuan untuk menyelidiki perilaku termal penggunaan paraffin wax di dalam tangki PATM jenis thermosyphon. Penelitian menggunakan kolektor matahari pelat datar dan tangki thermal energy storage (TES) yang dipasang secara horisontal di sisi atas kolektor. Di dalam tangki terdapat alat penukar kalor yang terdiri dari sekumpulan pipa kapsul dimana di dalamnya berisi paraffin wax. Air digunakan sebagai SHS dan heat transfer fluid (HTF). Termokopel dipasang di sisi HTF dan sisi PCM. Piranometer dan sensor temperatur udara luar diletakkan di dekat kolektor matahari. Pengambilan data dilakukan selama proses charging. Temperatur HTF, PCM dan intensitas radiasi matahari direkam setiap 30 detik. Data ini digunakan untuk mengetahui evolusi temperatur HTF dan PCM. Berdasarkan evolusi temperatur ini kemudian dianalisis perilaku termal PATM. Hasil dari penelitian ini adalah bahwa paraffin wax telah berfungsi sebagai penyimpan energi termal bersama air di dalam tangki PATM jenis thermosyphon. PCM memberi kontribusi yang cukup signifikan terhadap kapasitas penyimpanan energi sistem. Efisiensi kolektor lebih optimal karena PCM dapat mempertahankan stratifikasi termal sampai akhir charging. Adanya PCM mampu mengendalikan penurunan efisiensi pengumpulan energi saat intensitas radiasi matahari menurun. Alat penukar kalor yang digunakan cukup efektif yang ditandai dengan kecepatan pemanasan rata-rata antara HTF dan PCM yang tidak berbeda jauh.

scholarly journals Experimental study of solidification of paraffin wax in solar based triple concentric tube thermal energy storage system

2018 ◽  
Vol 22 (2) ◽  
pp. 973-978 ◽  
Author(s):  
Rengarajan Ravi ◽  
Karunakaran Rajasekaran
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Solidification Process ◽  
Energy Storage System ◽  
Paraffin Wax ◽  
Heat Transfer Fluid ◽  
Thermal Energy Storage System

This paper addresses an experimental investigation of a solar based thermal energy storage system to meet current energy demand especially for milk industry in Tamil Nadu, India. A solar based energy storage system has been designed to study the heat transfer characteristics of paraffin wax where it is filled in the middle tube, with cold heat transfer fluid flowing outer tube, inner tube, and both tubes at a time during solidification process in a horizontal triple concentric heat exchanger. In this study, main concentrations are temperature distributions in the energy storage materials such as paraffin wax during solidification process and total solidification time. Three heat recovery methods were used to solidify paraffin wax from the inside tube, outside tube, and both tubes methods to improve the heat transfer between heat transfer fluid and phase change materials. The experiment has been performed for different heat transfer fluid mass-flow rates and different inlet temperatures and predicted results shows that solidification time is reduced.

Heat transfer enhancement of paraffin wax using compressed expanded natural graphite for thermal energy storage

Carbon ◽  
2010 ◽  
Vol 48 (1) ◽  
pp. 300-304 ◽  
Author(s):  
Yajuan Zhong ◽  
Sizhong Li ◽  
Xinghai Wei ◽  
Zhanjun Liu ◽  
Quangui Guo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Heat Transfer Enhancement ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Paraffin Wax ◽  
Transfer Enhancement ◽  
Natural Graphite

scholarly journals Thermo-convective Study of a Shell and Tube Thermal Energy Storage Unit

2018 ◽  
Author(s):  
Abderrahmane Elmeriah ◽  
Driss Nehari ◽  
Mohamed Aichouni
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Paraffin Wax ◽  
Tube Length ◽  
Storage Unit ◽  
Shell Diameter ◽  
Shell And Tube

In this paper, we have studied numerically thermo-convective characteristics between a heat transfer fluid (HTF) and phase change material (PCM) in shell and tube thermal energy storage (TES) unit. The paraffin wax is considered as a PCM, filled in a shell which is thermally isolated with the external environment, while the water plays a role of a HTF and flows inside the tube at the moment of charging and discharging cycle. The heat transfer between HTF and PCM is performed by conduction and forced convection, this transfer allows to change the physical state of PCM solid-liquid to obtain a quantity of storable heat in order to create a thermal battery. Enthalpy formulation is used to analyze the heat transfer during melting and solidification process. A good agreement was found between our numerical predictions and the results of the literature. On the other hand, we have investigated the effect of geometrical parameters (tube length and shell diameter) and Reynolds number on the charging and discharging cycles. The obtained results reveal that the tube length and the shell diameter are the most influential parameters on the time of storage system. Similarly, the Reynolds number has much impact on the HTF outlet temperature and the time of solidification and melting process. Furthermore, we have proposed a new thermal storage unit containing the Paraffin wax and RT60 that it gives us a good rate and time of storage compared to the first unit that has only the paraffin wax.

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