Parametric investigation to assess the melt fraction and melting time for a latent heat storage material based vertical shell and tube heat exchanger

Kalapala, Lokesh; Devanuri, Jaya Krishna

doi:10.1016/j.solener.2019.09.076

Cited by 36 publications

(13 citation statements)

References 40 publications

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“…Storing of thermal energy can be achieved either using sensible or latent heat storage materials. In comparison to sensible heat storage materials, latent heat storage materials take 5-14 times less volume to store the same amount of energy [5]. The thermal energy stored/released during the phase change process is latent heat.…”

Section: Introductionmentioning

confidence: 99%

Investigation on compatibility and thermal reliability of phase change materials for low-temperature thermal energy storage

Devanuri

Gaddala

Kumar

2020

Mater Renew Sustain Energy

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Two of the important aspects for the successful utilization of phase change materials (PCMs) for thermal energy storage systems are compatibility with container materials and stability. Therefore, the present study is focused on testing the corrosion resistance and surface characteristics of metals in contact with PCMs and thermal behavior of PCMs with heating/cooling cycles. The PCM selection is made by targeting low temperature (<100 °C) heat storage applications. The PCMs considered are paraffin wax, sodium acetate tri-hydrate, lauric acid, myristic acid, palmitic acid, and stearic acid. The metal specimens tested are aluminum, copper, and stainless steel because of their wide usage in thermal equipment. The tests are performed by the method of immersion corrosion test, and ASTM G1 standards are followed. The experiments are carried out at 80 °C and room temperature (30 °C) for the duration of 10, 30, and 60 days. Pertaining to thermal stability 1500 melting/freezing cycles are performed. Investigation has been carried out in terms of corrosion rate, SEM analysis of metal specimens, appearance of PCMs, and variation of thermophysical properties at 0th, 1000th, and 1500th thermal cycles. The most affected area of corrosion, including the dimension of pits, is presented, and comparison is made. Based on the corrosion experiments, recommendations are made for the metal–PCM pairs. Pure sodium acetate trihydrate is observed to suffer from phase segregation and supercooling. After 1500 thermal cycles, the variation in melting and freezing point temperatures for rest of the five PCMs are in the range of − 1.63 to 1.57 °C and − 4.01 to 2.66 °C. Whereas, reduction in latent heat of melting and freezing are in the range of 17.6–28.95% and 15.2–26.78%.

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Section: Introductionmentioning

confidence: 99%

Investigation on compatibility and thermal reliability of phase change materials for low-temperature thermal energy storage

Devanuri

Gaddala

Kumar

2020

Mater Renew Sustain Energy

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“…Kalapala and Devanuri [7] presented a numerical investigation on melting characteristics of a PCM placed in the annulus of a vertical shell and tube thermal storage unit of L/D ratio of 1-10. They found that increasing length/diameter (L/D) ratio increased the total melting time.…”

Section: Introductionmentioning

confidence: 99%

Melting/Solidification Processes of PEG 1500 in Vertical and Horizontal Annular Enclosure

Hamad¹,

Egelle²,

Mohammed³

et al. 2021

JEPT

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In this paper, the primary aim is to look at the fundamental melting/solidification processes of polyethylene glycol 1500 (PEG 1500) for energy storage – insulation to prolong the cooling time of pipelines in unexpected shut-down conditions, prevent/minimize the wax deposition, and hydrate formation. Polyethylene glycol 1500 was selected because its melting temperature is >317 K making it a suitable candidate as lagging material to prevent wax deposition and hydrate formation in subsea oil pipelines. Experimental apparatus was designed with the Perspex to give an insight into the melting process. Vertical and horizontal annular geometries were used to consider the real-life cases. The vertical annular enclosure length is 950 mm and 34 mm width (Height/Width=27.94). The horizontal annular enclosure length is 300mm and 15.9 mm width (Height/Width=18.87). The thermocouples and camera are used to collect the data for three cases of inner wall temperature of 333 K,343 K and 353 K where is the heat added to the phase change material (PCM) for both cases. The main conclusions are: i) the horizontal annular case melt faster than the vertical case, in particular, at higher heating surface temperature of 353 K, ii)The temperature of the inner region was remained hot for long time which provide a good evidence that support the concept of using the PCM as heat storage–insulation material; iii) the melting percentage for horizontal case is 100% higher from the melting percentage of vertical case at 333 K which reduced to about 20% for 343 K, iv) increasing the heating surface temperature substantially reduces the total melting time for both orientations.

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“…[ 34 ] Besides having the shell filled with PCM and the heat transfer fluid (HTF) flowing through the tubes, this concept can also be turned around with the PCM being inside the tube and the HTF flowing around them. [ 35–37 ]…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal Management of a High‐Temperature Methanol Fuel Cell Using a Latent Heat Storage

et al. 2021

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Waste heat from industrial applications offers a high but mostly unused potential due to the time differences between its generation and possible consumption. By using waste heat, the energy efficiency can be increased and therefore, the overall costs and emissions can be reduced. This work shows the feasibility of increasing the energy efficiency of a high‐temperature methanol fuel cell using a latent heat storage with the help of full‐scale experiments. The fuel cell needs to be preheated for start up to reach its operation temperature. During operation, heat is generated at a temperature of 433 K and the system needs to be air‐cooled to maintain its temperature. Instead of cooling the fuel cell with air and losing the heat to the environment, the waste heat is now stored in a latent heat storage to later be used for preheating the fuel cell. Different experiments are conducted to find the optimum operation point of the latent heat storage in combination with the fuel cell. The aging and the cycling stability of high density polyethylene, which is used as phase change material in the latent heat storage, is monitored as well as the mechanical stability of the system.

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Parametric investigation to assess the melt fraction and melting time for a latent heat storage material based vertical shell and tube heat exchanger

Cited by 36 publications

References 40 publications

Investigation on compatibility and thermal reliability of phase change materials for low-temperature thermal energy storage

Investigation on compatibility and thermal reliability of phase change materials for low-temperature thermal energy storage

Melting/Solidification Processes of PEG 1500 in Vertical and Horizontal Annular Enclosure

Analysis of the Thermal Management of a High‐Temperature Methanol Fuel Cell Using a Latent Heat Storage

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