Heat transfer enhancement of air-concrete thermal energy storage system – CFD simulation and experimental validation under transient condition

Abstract

This investigation studied the packed bed thermal energy storage system with concrete and air used as the energy storage material and working fluid respectively. Three different configurations of packed bed arrangements such as regular ring, staggered ring and staggered ring with clearance are studied. The temperature distribution outcome of the experimental values compared with three-dimensional transient based computational simulation. The flow influencing parameters such as pressure drop, turbulence intensity, design of packed beds, the surface area of packed beds, the void fraction of the system discussed. Experimental results are in excellent agreement with simulation results. It is observed that staggered ring arrangement with the clearance for packed bed have better charging and discharging profile compared to the other two arrangements.

Genetic Algorithm Integrated Fuzzy AHP-VIKOR Approach for the Investigation of W-Cut Insert Heat Exchanger for Cooling of Dielectric Fluid Used in Ultra-High Voltage Transformer

“…Nu � (f/8)(Re − 1000)Pr 1 + 12.7(f/8) 0.5 Pr 0.33 − 1 􏼐 􏼑 for3000 < Re < 500, 000. (34) Correlations for the friction factor-correlation of Blasius is as follows:…”

“…Increased Nusselt number results in energy saving, whereas a rise in friction factor upsurges the pumping cost. Hence, the optimization of grooved tube heat exchanger is essential for obtaining high performance with energy saving and pumping cost reduction [33,34]. Blade vortex generator inserts, multiple helical tape inserts, and diverging perforated cones are special types of inserts that are used as turbulators to reduce the flow blockage in downstream conditions and improve the Reynolds number [35].…”

Integrating Nanomaterial and High-Performance Fuzzy-Based Machine Learning Approach for Green Energy Conversion

“…This system can identify, predict, and control the complex, nonlinear, and imprecise systems. This is very attractive technology that can solve any problems without any accurate mathematical models [16]. Typically, a fuzzy system is formed by collecting knowledge from subject experts and converting their tacit knowledge of the underlying process into linguistic variables and fuzzy rules.…”

A Holistic Framework for Environment Conscious Based Material Selection and Experimental Assessment Using Digraph-Based Expert System

“…e matrix assessment gives an index value, which indicates the efficacy of the material. is approach has been used by various works of literature since it is more adaptable for various applications [24][25][26][27][28][29].…”