Memon et al. [27] numerically studied the effect of the location and shape of the heat transfer tube on the melting behavior of the lauric acid in a container with a square shell. They reported that the highest heat transfer rate and energy storage can be achieved with heat transfer tube located close to the bottom wall of the adiabatic shell.

Heat energy storage systems offer the benefits of high energy storage efficiency and consistent temperature due to the use of phase change material (PCM); however, its disadvantage is that

In this work, it is suggested to use the spiral-wired tube, a finned tube with a coiled helical spiral connecting the fins end. The study includes a comparison between

A steel tube, 1800 mm long with 15 mm outer diameter, is used as heat exchanger between the heat transfer fluid (HTF) water and the PCM. It is installed

An increase in heat storage of 2.8 % is found for FE and SC compared with FC. The heat storage rate at the start for FC is 476 W and 371 and 348 W for SC and FE. The heat storage rate has increased by 28 and 36 % for FC compared to SC and FE. Hence, FC is more effective in melting PCM than other configurations.

Abstract. Heat energy storage characteristics of a new type of PCM heat exchange tube was researched, in which it took the traditional double-tube exchanger as the total construction foundation

The experimental results showed that, a new type of PCM heat exchange tube could store heat energy from the hot air by the phase change material in the

Experimental and computational evolution of a shell and tube heat exchanger as a PCM thermal storage system. Int. Commun. Heat Mass Transfer, 50 Internal and external fin heat transfer enhancement technique for latent heat thermal energy storage in triplex tube heat exchangers. Appl. Therm. Eng., 53 (1) (2013), pp.

To address the issues of uneven heat transfer and low heat storage rate in the vertical shell-and-tube latent heat thermal energy storage (LHTES) unit, in the paper, the flip method is proposed to

Abstract. This paper addresses a numerical and experimental investigation of a cold thermal energy storage system involving phase-change process dominated by heat conduction. The problem involves a fluid flowing inside a horizontal finned tube surrounded by a phase-change material (PCM). The objective of this paper is to predict

The latent thermal energy storage unit considered in the present study is a shell-and-tube type heat exchanger (Ø: 0.4 m) with multi-tubes, where heat transfer fluid (HTF) flows through the twenty-five inner tubes and the external side of the exchanger.

This study shows that the proposed latent heat thermal energy storage unit (M06) significantly reduces PCM melting time compared with vertical (76%), horizontal (66%), and helical-coiled (53%) systems. The helical-coiled unit with spiral fins (M05) has the highest exergy efficiency (0.77) at the end of melting time.

A novel triplex-tube heat exchanger (TTHX) is proposed to improve the simultaneous storage and recovery processes via an effective dual-PCM configuration. The proposed design achieves better storage and recovery compared to the application of aluminum oxide (Al₂O₃) nanoparticles of 1% or 3% volume fraction with a single-PCM

Abstract. Inadequate melting of phase change material (PCM) in concentric tube and shell and tube heat exchangers appeal motivations for innovative latent heat thermal energy storage (LHTES) systems. In the current research, a novel application of toroidal tubes inside the LHTES system for charging of PCM is presented.

The rising attention on heat transfer intensification in shell-and-tube latent heat thermal energy storage units using high conducting fins is proved by the design approach using topology optimization and multi The present thermal storage tank differs from a conventional shell-and-tube heat exchanger for the absence of plate baffles. The

A sectional view of the Gupta''s cross-counter-flow coiled finned-tube heat exchanger is shown in Fig. 7. Download : Download high-res image (260KB) Download : Simulation of heat transfer in the cool storage unit of a liquid-air energy storage system heat transfer—Asian. Research, 31 (4) (2002) Google Scholar [78]

Fig. 1 presents the graphical representation of the current TTHX. The simultaneous charging-discharging of energy is considered in the design. The storage unit includes three concentric copper tubes with dimensions provided in Table 3.The hot heat transfer fluid (HHTF) flows inside the inner tube, while the cold heat transfer fluid

A 3-D structure diagram of a horizontal triplex-tube latent heat thermal energy storage unit (T-LHTESU) studied is shown in Fig. 2 (a), which is composed of three concentric tubes with a length of 200 mm. The inner/outer tubes are used for the inflow of heat transfer fluid (HTF), and the intermediate tube is used to fill phase change material

This paper investigates the cryogenic heat transfer phenomena of nitrogen flowing in helically coiled tubes under the combined effects of pseudocritical conditions, buoyancy, and coil curvature. The

A tube-fin cool storage heat exchanger (CSHE) is proposed for use in thermal control systems. •. A CSHE can extend the thermal control time by 114.8% and can be recycled. •. The thermal control performance of 0% graphene mass fraction in PCM is greater than that of 5%.

By examining the performance of the system as an effective heat exchanger, the horizontal Latent Heat Energy Storage System was observed to be at least 36 %, 30 %, and 47 % more effective than the

This triplex-tube heat exchanger was used as an energy storage container for a solar-powered liquid desiccant air-conditioning unit [36]. It consists of three horizontally mounted concentric copper tubes with lengths of 500 mm. The outer diameters of the inner, middle and outer tubes are 50.8, 150 and 200 mm respectively.

Previous studies in literatures adequately emphasized that inserting fins into phase change material is among the most promising techniques to augment thermal

When compared to the situation of one heat transfer tube, the vertical two-tube arrangement was the best, with a 27.7 % reduction in overall melting time and a 33.6 % increment in energy storage rate.

Shell-and-tube latent heat thermal energy storage units employ phase change materials to store and release heat at a nearly constant temperature, deliver high effectiveness of heat transfer, as well

The importance of latent heat thermal energy storage is significant in contrast to sensible energy storage because of the large storage energy densities per unit mass/volume at nearly constant thermal energy. In this paper, heat transfer enhancement technique by using internal and external fins for PCM melting in a triplex tube heat

The numerical analysis showed that heat transfer rate is sensitive to tube diameter. Ismail et al. [15] found that the fin structures perform better when located at the top of heat transfer fluid (HTF) tube, and the melting rate of PCM decreased when the number of horizontal fins was greater than four for a given total fin volume.

Researchers have come up with many novel and effective methods to improve the charging performance of the latent thermal energy storage heat exchangers. In this study, a horizontal latent thermal energy storage heat exchanger with a movable inner tube (MTHX) was introduced, and a two-dimensional model of the MTHX was developed.

Shell-and-tube latent heat thermal energy storage units employ phase change materials to store and release heat at a nearly constant temperature, deliver high effectiveness of heat transfer, as well as high charging/discharging power. Even though many studies have investigated the material formulation, heat transfer through

The present numerical and experimental study focused on the faster heat storage rate for storing heat energy from solar collectors and its applications during off

The device here presented is designed to store the cold thermal energy provided by the heat transfer fluid (HTF). Therefore, the apparatus is based on the heat transfer between the fluid in the tube-side, i.e., cold water and the one in the shell-side, i.e., PCM.The present thermal storage tank differs from conventional STHE for the absence