Before going into the details of a fin''s effect on heat transfer behaviour, it is essential first to analyze and compare a square enclosure with a fin against a square enclosure without a fin. Fig. 3 (a) and Fig. 3 (b) show the temperature contours for a square enclosure without and with fin respectively, filled with water-based alumina nanofluid at Φ …
Thermochemical energy storage has substantial potential for greater density storage at temperatures over 200 C. Heat transfer enhancement of materials and reactors is …
Abstract. This research work studies the heat transfer characteristics of a direct contact evaporator. A cold two phase refrigerant (R12 or R22) is injected into water kept in a storage tank to exchange heat with the water directly. The water temperature is reduced to the freezing point, and ice could be formed.
Purpose: This study aims to propose and analyze a novel structure to enhance latent heat energy storage using a graphite sheet combined with a PCM …
A ground heat exchanger (GHEX) is an area of the earth that is utilized as a seasonal/annual cycle thermal battery. These thermal batteries are areas of the earth into which pipes have been placed in order to transfer thermal energy. Energy is added to the GHEX by running a higher temperature fluid through the pipes and thus raising the ...
Energy storage technologies were regarded as critical means to achieve these goals because they can reduce the energy consumption of thermal power systems and provide novel energy storage materials for new sustainable energy power systems [3]. ... To investigate the heat transfer, energy conversion and efficiency of hydrate cold …
Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array Renew Energy, 35 ( 1 ) ( 2010 ), pp. 198 - 207 View PDF View article View in Scopus Google Scholar
As a new type of heat transport medium with high efficiency and high heat transfer performance, nanofluids can effectively improve the heat transfer performance …
Latent Thermal Energy Storage (TES) has been widely recognized in the academic community and regarded as one of the most promising technologies for heat storage. As one of the most efficient TES systems, finned-tube TES, including annular, helical and longitudinal fins, have been intensively investigated in terms of principles, …
Phase change materials (PCMs) having a large latent heat during solid-liquid phase transition are promising for thermal energy storage applications. However, the relatively low thermal conductivity of the …
Melting and solidification have been studied for centuries, forming the cornerstones of PCM thermal storage for peak load shifting and temperature stabilization. Figure 1 A shows a conceptual phase diagram of ice-water phase change. At the melting temperature T m, a large amount of thermal energy is stored by latent heat ΔH due to …
Viscous dissipation effects on heat transfer, energy storage, and entropy generation for fluid flow in a porous channel submitted to a uniform magnetic field January 2014 Journal of Porous Media ...
Accurate and precise estimation of waste heat recovery can be estimated by coupling a latent heat thermal energy storage system (LHTES) to waste heat releasing system. The amount of waste heat recovered can be achieved 45% to 85% depending on the thermal energy storage material properties, size of processing industry, …
Compared with sensible heat energy storage, latent heat thermal energy storage system (LHTES) has higher energy storage density. However, the low thermal conductivity of PCM is a major obstacle to achieving more efficient LHTES technology. Therefore, this study uses numerical simulation to evaluate the effectiveness of five enhanced heat transfer …
Nowadays, most thermal energy storage systems available on the market are based on sensible heat storage using water storage tanks or latent heat storage using phase change materials (PCMs) [1]. In general, the latent heat storage can provide higher energy density and stable operating temperature compared with the sensible heat storage.
Thermal energy storage can be accomplished either by using sensible heat storage or latent heat storage. Sensible heat storage has been used for centuries by builders to store/release passively thermal energy, but a much larger volume of material is required to store the same amount of energy in comparison to latent heat storage [11] .
In general, the latent heat storage can provide higher energy density and stable operating temperature compared with the sensible heat storage. In recent years, more and more attention has been paid on the latent heat energy storage systems, and various phase change materials have been developed for different practical applications …
In the process of industrial waste heat recovery, phase change heat storage technology has become one of the industry''s most popular heat recovery technologies due to its high heat storage density and almost constant temperature absorption/release process. In practical applications, heat recovery and utilization speed …
In the present study, we assumed that the TES system storing thermal energy of 20–685 C is operated with a daily cycle consisting of 6 h of charging, 6 h of idling, 6 h of discharging and 6 h of idling.Based on the research by Kim et al. (2012), the specifications of the TES system were determined to produce the electrical energy at a …
The thermal resistance for thermal energy storage unit was mainly present on the heat transfer fluid (air) side, whose thermal resistance was much higher than that on the phase change materials side. In practical applications, metal foam should be arranged in both the two domains simultaneously to achieve the best thermal storage performance.
An experimental and numerical investigation of heat transfer during technical grade paraffin melting and solidification in a shell-and-tube latent thermal energy storage unit Sol. Energy, 79 ( 6 ) ( 2005 ), pp. 648 - 660
The research on heat and mass transfer mechanism includes the heat and mass transfer and chemical reaction processes between the heat transfer medium (thermal carrier) and Ca(OH) 2 /CaO. Understanding the mechanisms and characteristics of heat and mass transfer helps optimize the reactor design and operating parameters to …
When the latent heat thermal energy storage unit used the phase change material, which applied both bubble-driven flow and nanoparticles, the time for full charging reduced by up to 23.3 %. The average temperature …
The heat transfer rate of thermal energy storage (TES) applying phase change material (PCM) will be reduced in the last stage since the heat is transferred to …
Various enhancement techniques are proposed in the literature to alleviate heat transfer issues arising from the low thermal conductivity of the phase change …
When the latent heat thermal energy storage unit used the phase change material, which applied both bubble-driven flow and nanoparticles, the time for full charging reduced by up to 23.3 %. The average temperature difference between the heat transfer fluid inlet and the latent heat thermal energy storage unit outlet increased by 1.64 times.
This paper provides a comprehensive review on the development of latent heat storage (LHS) systems focused on heat transfer and enhancement techniques …
1. Introduction. With the increasing energy demand of human society, energy storage is becoming more and more crucial [1].Among the various energy storage technologies, latent thermal storage has the advantages of low cost and environmental friendly [2], [3].However, most of the phase change materials (PCM), which are the key to …
Heat transfer media (HTM) refers to the fluid or other material that is used to transport heat from the solar receiver to TES and from TES to the turbine or industrial process. Existing state-of-the-art CSP plants use a liquid, molten nitrate salts, as both the TES and HTM materials. For next-generation, higher temperature systems, a number of ...
3. Results and discussion3.1. Effect of phase transition width and temperature In this section, winter water supply temperature was 310.15 K, summer water supply temperature was 288.15 K, heat storage time was 8 …
Energy Storage is a new journal for innovative energy storage research, covering ranging storage methods and their integration with conventional & renewable systems. Abstract Moving packed bed particle/supercritical carbon dioxide (SCO2) heat exchanger (MPBE) is a critical equipment to integrate particle thermal energy storage …