Heat exchangers are the most common type of pressure vessel and, in many cases, are used in conjunction with other pressure vessel types that also must be able to contain high temperature and/or …
This study presents a numerical analysis of the melting process in a shell-and-tube latent heat thermal energy storage (LHTES) system, featuring a twisted elliptical inner tube with annular fins.
An experimental investigation was performed on the static melting process of vertical and horizontal tube-in-shell Latent Heat Energy Storage Systems to …
Investigation of Melting Process of Encapsulation Phase Change Material in Spiral Shell and Tube ... These materials enable us to design the individual thermal energy storage systems (TESS ...
The physical models of two shell-and-tube LHTES units are shown in Fig. 1.The length of the pipe and cylinder models (L p /L c) is 500 mm, and the radii of the inner and outer tubes are 10 mm and 14.14 mm (R o = 2 …
Abstract. Flawless tube and tubesheet joints are necessary for shell and tube heat exchanger with high leakproof ability and durability. The consequence of mixing of transfer fluids due to the defective welded or expanded tube-to-tubesheet joint results in complete malfunctioning of the heat exchange process. In this case, there is a high …
Previous studies in literatures adequately emphasized that inserting fins into phase change material is among the most promising techniques to augment thermal …
The melting performance enhancement in a shell and tube thermal energy storage device containing different structures and materials was investigated in this study. Four different enhanced configurations including topology optimized fin, metal foam, longitudinal fin and composite PCM were evaluated and compared numerically.
In this research, thin-walled cylindrical samples with a square cross-section were created by the welding method, considering different welding lines. A total of 21 geometrically similar samples were prepared to investigate the effect of weld lines on the energy absorption parameters of the samples. The results of the study showed that, …
Therefore, in this study, the heat transfer process and energy storage performance of a shell-and-tube LTES heated by sinusoidal inlet temperature are …
Failure analysis was carried out on a tube-to-tubesheet welded joint of a shell-tube heat exchanger to confirm its failure mechanism. The collected evidence suggests that the failure of the tube-to-tubesheet welded joint was induced by fatigue. Under the morphology analysis, the fracture surface exhibit obvious fatigue crack …
What is a heat exchanger? Heat exchanger is a kind of heat transfer equipment which transfers part of heat from hot fluid to cold fluid. It is widely used in people''s daily life, petroleum, chemical, power, medicine, atomic energy and nuclear industry. It can be used as independent equipment, such as heater, condenser, cooler, etc; It can also be …
Parallel seam welding (PSW) is the most commonly employed encapsulation technology to ensure hermetic sealing and to safeguard sensitive electronic components. However, the PSW process is complicated by the presence of multiphysical phenomena and nonlinear contact problems, making the analysis of the dynamics of the PSW process highly …
Cyclic performance of cascaded and multi-layered solid-PCM shell-and-tube thermal energy storage systems: A case study of the 19.9 MW e Gemasolar CSP plant Author links open overlay panel S. Saeed Mostafavi Tehrani a, Yashar Shoraka a, Karthik Nithyanandam b, Robert A. Taylor a
The current research attempts to enhance the thermal performance of a shell-and-tube heat exchanger by means of using PCM and a modified tube design. The …
International Journal of Engineering Research and General Science Volume 4, Issue 3, May June, 2016. ISSN 2091-2730. 432 Design and Analysis of Welding Fixture for Inlet Header of ...
The schematic diagram of the traditional cylindrical shell-and-tube TES tank (case 0) is shown in Fig. 1 (a).The HTF (air) flows in the inner tube and the shell side is full of the PCM (54%NaNO 3 /46%KNO 3).The height (H) is 200 mm, the radius for the inner tube (R in) is 20 mm, and the thickness of the tube (δ) is 1 mm selecting the steel as the …
The shell and tube exchanger consists of four major parts: Front Header—this is where the fluid enters the tubeside of the exchanger. It is sometimes referred to as the Stationary Header. Rear Header—this is where the tubeside fluid leaves the exchanger or where it is returned to the front header in exchangers with multiple …
The process of tube to tubesheet welding involves creating a joint between well-prepared tubes and tubesheet to fix them in place. The tubes function to transfer the heat between fluids involved in the process of heating or cooling. But the temperature within the heat exchanger can go as high as 1000° C, and at such a high temperature, the ...
This paper introduced a further heat transfer enhancement technique by inserting porous metal foam into the fin interstitials for a shell-and-tube thermal energy storage unit. The energy charging/discharging were evaluated by means of indicators including complete melting/solidification time, heat transfer coefficient, temperature …
Step 12 – Formation & Sealing. The cell is charged and at this point gases form in the cell. The gases are released before the cell is finally sealed. The formation process along with the ageing process can take up to 3 weeks to complete. During the formation process a solid-electrolyte interface (SEI) develops.
The weld nugget is formed from the solidification of the molten metal after a heating by the Joule effect [], and the weld nugget size, especially the nugget diameter, is used as an indicator of weld quality [].On the other hand, and given that, according to Özyürek [], structures using RSW joints are typically designed so that these joints are …
and thermal boundary conditions on the energy storage performance of a vertical shell-and-tube L TES. W ang et al. [ 15 ] studied t he effects of the temperature difference between the Heat ...
This section verifies the independence of grid size and time step. The melting process of PCM is simulated. The dimensionless fin length and width are 0.5 and 0.1, respectively. The rotational speed of the finned tube is 1 rpm. The temperature of the inner tube is T h = 353.15 K. Five grid systems of different sizes are selected, with the …
Paraffin was the most used PCM in the thermal energy storage units, which is inferred from the literature studies, and the most effective and commonly used heat storage unit is shell and tube heat exchanger [19]. …
Utilizing the solar energy by thermal energy storage system is an important way to solve energy shortage. In this paper, a 2D physical and mathematical model for …
In this paper, the solidification process of the phase change material (PCM) in the shell-and-tube latent-heat thermal energy storage unit (LTESU) strengthened by fin is studied.
To exploit the advantage of LHTES, the most common design reported in the literature is shell-and-tube type latent heat thermal energy storage (ST-LHTES) systems with phase change material filled in shell side, while (heat transfer fluid) HTF flows in the tubes (or vice versa).
Open Access Article. Enhancing the Melting Process of Shell-and-Tube PCM Thermal Energy Storage Unit Using Modified Tube Design. by. Aissa …
The Manufacturing Process. Heat exchangers are manufactured from basic material shapes that undergo forming, machining, and welding processes to fabricate them into the major components. Channel and shell cylinders are typically rolled and welded plates (greater than 24-inch diameter) or pipe (24-inch or less diameter).
Below is the standardized procedure to weld build-up on the joints. Prepare the surface at the wasted area by grinding and conducting PT prior to weld build-up. The existing general drawing welding detail is shown in Fig. 3 [37]. As per the general drawing (refer to Fig. 3) total of 13 CS joints and six LS joints.
Shell-and-tube latent heat thermal energy storage units employ phase change materials to store and release heat at a nearly constant temperature, deliver …
Based on the specified geometry, the index of effective energy storage ratio E st [28] for the melting process of PCM is defined as: (1) E s t = Q eff Q S W S (2) Q S W S = ρ w c p, w V (T i n − T 0) (3) Q eff = ∫ 0 t eff m ˙ c p, w (T i n − T o u t) d t where Q eff is the effective energy storage capacity of the LHTES system, evaluating the actual amount of …
Yang et al. [4] numerically investigated on melting process in a shell-and-tube latent heat thermal energy storage (LHTES) unit with annular fins. Results demonstrate that the full melting time could be maximally reduced by 65% by inserting annular fins into PCM.
A shell and tube heat exchanger, in simple words, is a type of heat exchanger where the two working fluids exchange heat with the help of, as the name suggests, tubes and a shell. One of these is called the tube side fluid and the other is known as the shell side fluid. The tubes are encompassed in a cylindrical shell which …
Shell and tube heat exchanger is a device where two working fluids exchange heats by thermal contact using tubes housed within a cylindrical shell. The fluid temperature inside the shell and tube are different and this temperature difference is the driving force for temperature exchange. They can be used for wide temperature and pressure range.
Magnetic pulse welding drives the workpiece to collide at high speed through non-contact force, which is suitable for welding dissimilar materials or materials with poor weldability. However, the low energy utilization rate of the welding system limits the application of this technology in the industry. Therefore, in order to excavate the key …
As previously said, a simple shell-and-tube geometry has been chosen for testing [29], [30] (Fig. 1).Thanks to the periodicity of the array of tubes in the tank, it''s possible to reduce the analysis to a single module composed by an inner steel tube, in which the heat ...