scholarly journals Aluminum Inserts for Enhancing Heat Transfer in PCM Accumulator

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 415 ◽  
Author(s):  
Anna Dmitruk ◽  
Krzysztof Naplocha ◽  
Jakub Grzęda ◽  
Jacek W. Kaczmar
Keyword(s):  
Phase Change Materials ◽  
Heat Storage ◽  
Storage System ◽  
Volume Ratio ◽  
Energy Storage System ◽  
Heat Fluxes ◽  
Heat Of Fusion ◽  
Maximum Temperature ◽  
Release Time ◽  
Storage Unit

Phase change materials (PCMs) are applied in heat storage units, as they are able to accumulate the energy in the form of the latent heat of fusion. Thus, they can be used in recovering the excess of heat from various industrial processes. Their main weakness is their low thermal conductivity coefficient, which strongly limits their usage. In this paper, the benefits of the application of metallic inserts in heat storage PCM-based units were elaborated. Two kinds of Al–Si spatial elements (foams and honeycomb structures) were produced with the use of means of the investment casting method. Key factors influencing the technological process were established. The surface’s roughness was measured in order to compare the obtained structures with their patterns in terms of the casting’s accuracy. The compressive strength of the samples was tested, and their fatigue resistance was considered. The thermal performance of manufactured inserts in the PCM (paraffin)-based accumulator, supported by the calculation of heat fluxes, was analyzed and adjusted. Finally, further optimization was conducted in terms of the volume ratio of the metal insert to the PCM. Metallic inserts were found to significantly affect the performance of the entire energy storage system, as their use results in reduced charging time, a longer heat release time, increased maximum temperature, and a significant reduction in the temperature gradient in the heat storage unit.

scholarly journals Thermal Performance Analysis of Solar Dryer Integrated with Heat Energy Storage System and a Low-Cost Parabolic Solar Dish Concentrator for Food Preservation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Wenceslaus Pantaleo Missana ◽  
Eugene Park ◽  
Thomas T. Kivevele
Keyword(s):  
Energy Storage ◽  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Heat Energy ◽  
Red Pepper ◽  
Maximum Temperature ◽  
Nitrate Salt ◽  
Storage Medium ◽  
Solar Dryer

Solar energy has become a viable alternative energy because it is a clean type of energy that converts solar radiation into heat energy for various applications such as heating water, power generation, cooking, and food drying. The solar dryer, integrated with the heat energy storage system, uses nitrate salt as a heat storage medium which was designed and tested by drying 1000 grams of red pepper at 19.6 to 62.4°C. The average ambient temperature ranged from 19.3 to 37.4°C, and the maximum temperature of the heat storage media ranged from 87.8 to 125°C. The solar drying process was compared to open sun drying system loaded with 1000 grams of red pepper. The findings showed that the solar dryer maintained color and flavor and lowered the original moisture content from 86% to 10% for 24 hours compared to 36 hours of drying in open air. In this study, nitrate salt is shown to be the perfect heat storage medium for drying food products; it preserved heat for about 4 hours when there is no active sunlight.

Energy Storage Control Based on Wind Farm

2012 ◽  
Vol 268-270 ◽  
pp. 933-936
Author(s):  
Xiao Dong Wang ◽  
Jin Hua Zhu ◽  
Ying Ming Liu ◽  
Hong Fang Xie
Keyword(s):  
Energy Storage ◽  
Wind Farm ◽  
Storage System ◽  
Energy Storage System ◽  
Network Capacity ◽  
Vanadium Redox Flow Battery ◽  
Energy Management Strategy ◽  
Storage Unit ◽  
Energy Storage Unit ◽  
Farm System

With the increase in wind power generation and network capacity, Wind farm power fluctuations on the grid greatly. In order to improve the operational stability of wind farm grid, at its outlet to increase the energy storage system for the new environmentally friendly vanadium redox flow battery (VRB) to effectively regulate the grid power. According to the VRB equivalent mathematical model using a bidirectional DC/AC converter as VRB storage system power regulator, the corresponding charge discharge control and energy management strategy are designed , and grid-connected wind farm system with VRB energy storage unit are modeled and simulated. Simulation results show that the fluctuations in wind speed Circumstances, the VRB energy storage system can quickly and effectively smooth the fluctuations of the active power of the wind farm output, and can provide reactive support to the grid, effectively improve the operating performance of wind farm.

scholarly journals Effective Separation of a Water in Oil Emulsion from a Direct Contact Latent Heat Storage System

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2264 ◽  
Author(s):  
Sebastian Ammann ◽  
Andreas Ammann ◽  
Rebecca Ravotti ◽  
Ludger Fischer ◽  
Anastasia Stamatiou ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Latent Heat ◽  
Direct Contact ◽  
Heat Storage ◽  
Storage System ◽  
Heat Transfer Fluid ◽  
Storage Unit ◽  
Latent Heat Storage ◽  
Oil Emulsion ◽  
Water In Oil Emulsion

The problem of emulsification between Phase Change Material (PCM) and Heat Transfer Fluid (HTF) in direct contact latent heat storage systems has been reported in various studies. This issue causes the PCM to flow out of the storage tank and crystallize at unwanted locations and thus presents a major limitation for the proper operation of such systems. These anomalies become more pronounced when high HTF flow rates are employed with the aim to achieve fast heat transfer rates. The goal of this paper is to find a method which will enable the fast separation of the formed emulsion and thus the uninterrupted operation of the storage unit. In this study, three separation methods were examined and the use of superhydrophobic filters was chosen as the best candidate for the demulsification of the PCM and HTF mixtures. The filter was produced by processing of a melamine sponge with different superhydrophobic adhesives and was tested with emulsions closely resembling the ones formed in a real direct contact setup. The superhydrophobic filter obtained, was able to separate the emulsions effectively while presenting a very high permeability (up to 1,194,980 kg h−1 m−2 bar−1). This is the first time the use of a superhydrophobic sponge has been investigated in the context of demulsification in direct contact latent heat storage.

A novel liquid air energy storage system using a combination of sensible and latent heat storage

2021 ◽  
pp. 117890
Author(s):  
Ju-Yeol Ryu ◽  
Adrian Alford ◽  
Graham Lewis ◽  
Yulong Ding ◽  
Yunren Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Latent Heat Storage

A new type of heat storage system using the motion of phase change materials in an elliptical-shaped capsule

2019 ◽  
Vol 182 ◽  
pp. 508-519 ◽  
Author(s):  
Dong Ho Shin ◽  
Jinsoo Park ◽  
Sung Ho Choi ◽  
Han Seo Ko ◽  
Sarng Woo Karng ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Storage System ◽  
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