Utilization of Carbon-Based Nanomaterials and Plate-Fin Networks in a Cold PCM Container with Application in Air Conditioning of Buildings

Abstract

Cold energy storage devices are widely used for coping with the mismatch between thermal energy production and demand. These devices can store cold thermal energy and return it when required. Besides the countless advantages of these devices, their freezing rate is sluggish, therefore researchers are continuously searching for techniques to improve their operating speed. This paper tries to address this problem by simultaneously combining a network of plate fins and various types of carbon-based nanomaterials (NMs) in a series of complex computational fluid dynamics (CFD) simulations that are validated by published experimental results. Horizontal, vertical, and the combination of these two plate-fin arrangements are tested and compared to the base model. Subsequently, several carbon-based NMs, including SWCNT, MWCNT, and graphene-oxide NMs are utilized to further improve the process. The influence of these fin networks, nanoparticle types, and their volume- and mass-based concentrations within the PCM container are studied and discussed. According to the results, carbon-based NMs exhibit superior performance compared to metal-oxide NMs, so that at identical NM volume and mass fractions, MWCNT particles present a 2.77% and 17.72% faster freezing rate than the CuO particles. The combination of plate-fin network and MWCNT particles is a promising technique that can expedite the ice formation rate by up to 70.14%.

Effect of fin configuration and orientation of latent heat storage system on the melting and solidification performance

“…4 This results in large melting and solidification time, which further results in a decrease in TES effectiveness. To increase the heat transfer rate, usage of techniques like increase in surface area, [5][6][7][8][9][10] the inclusion of nanoparticles, [11][12][13] encapsulation, 14,15 metal foam, 16,17 cascading, 1 placing HTF tube in eccentric position 18 and hybrid techniques 19,20 were suggested in the literature. Although there are many configurations for PCM HXs almost 70% of researchers use S&T-HXs due to minimal heat loss.…”

Multi-Objective Optimization and Optimal Airfoil Blade Selection for a Small Horizontal-Axis Wind Turbine (HAWT) for Application in Regions with Various Wind Potential

“…However, the rise in energy demand and dependence on fossil fuels has led to energy crises, declining resources, and environmental pollution [3]. Although optimizing energy systems [4,5] and employing energy storage devices [6] are considered by scholars, the use of renewable energy sources [7] is one of the most effective solutions to cope with these difficulties. Among renewable energy sources, wind energy is the most common and sustainable type of energy and, currently, the application of this free energy source is being considered more than ever [8].…”