Improved PCM melting in a thermal energy storage system of double-pipe helical-coil tube

Mahdi, Mustafa S.; Mahood, Hameed B.; Mahdi, Jasim M.; Khadom, Anees A.; Campbell, Alasdair N.

doi:10.1016/j.enconman.2019.112238

Cited by 118 publications

(22 citation statements)

References 41 publications

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“…Moreover, it was found that the upward HTF flow direction ensured the shortest melting time in the cylinder and pipe model DTHX. On the other hand, Mahdi et al [81] found that the melting time of PCM in horizontal DTHX was reduced by 28% compared to vertical DTHX. Mehta et al [82] showed that the melting time of a PCM in vertical and horizontal DTHXs was 480 and 460 min, respectively, which gives a difference of less than 5%.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 97%

“…Such an improvement was a result of a better PCM distribution, i.e., the volume of PCM decreased with the HTF flow path and decreasing temperature difference between the HTF and PCM. Another type of heat exchanger-double-tube helical-coil HX, which is shown in Figure 8, was proposed by Mahdi et al [81]. The melting time of a PCM in the proposed HX was reduced by about 25.7% and 60% compared to horizontal and vertical straight DTHX, respectively.…”

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

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The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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Section: Double-tube Heat Exchangersmentioning

confidence: 97%

Section: Double-tube Heat Exchangersmentioning

confidence: 99%

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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“…The PCM properties are assumed as constant and given in Table 2. The density of PCM is modelled with Boussinesq approximation to neglect volume expansion in the PCM via natural convection (Mahdi et al 2020). The governing equations are given below:…”

Section: Modelling Of the Pcm Pack Melting And Solidification By Cfd Toolmentioning

confidence: 99%

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Riffat

Kutlu

Brito

et al. 2021

Future Cities and Environment

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This paper investigates the transient performance of a DC compressor fridge incorporated with Phase Change Material (PCM) for weak/off-grid setting regions. A photovoltaics (PV) module is directly connected to the DC compressor without use of batteries and inverter, in order to simplify the system and reduce its cost. The DC compressor speed can be adjusted according to the radiation intensity for an optimum match between PV output and the efficiency of refrigeration. During the daytime, the PCM is charged for cold storage by refrigeration; when solar radiation is weak or during the night, the PCM releases cooling to maintain the required cabinet temperature. A transient mathematical model is built for the whole system including PV module, DC compressor refrigeration system, fridge cabinet and PCM packs. The model is coded and solved in MATLAB while CFD method is used to produce some additional information. The simulations are conducted to evaluate the effect of solar radiation intensity, thermostat setting and the number of PCM packs on the fridge refrigeration performance. Moreover, the study aims to investigate and present benefits of incorporating PCM with a direct PV powered DC compressor fridge in weak/off-grid setting areas. When the fridge cabinet temperature varies between 4℃ and -2℃, the average COP of the fridge refrigeration system was found 1.7 for high solar radiation day due to the high rotation speed of the compressor, but for low solar radiation day, the average COP was calculated as 1.95. The analysis also shows that a variable speed DC compressor can keep the foods in the desired temperature range for two days of power outage by using 1 m 2 PV module and 3.6 kg of thin PCM packs.

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“…Therefore, different arrangements of layers, fin sizes, intermediate cylinder sizes, and HTF temperature were tested at the bottom of the storage that leads in a quick melting rate. The performance of the PCMS in a double‐pipe heat exchanger, 113 illustrated in Figure 39, triplex tube heat exchanger, 114 multitube shell and tube LHTES system, 115 U‐tube of festoon design system, 116 and rotating cylinder system 117 were studied. Due to the higher contact heat transfer surface area, the triplex tube heat exchanger is much needed to be used than double tube heat exchanger.…”

Section: Application Of Pcm In the Thermal Management Of Buildingsmentioning

confidence: 99%

“…Three‐dimensional view of the horizontal and vertical straight double‐pipe helical‐coiled latent heat thermal energy storage units 113 . LHTES, latent heat thermal energy storage [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Application Of Pcm In the Thermal Management Of Buildingsmentioning

confidence: 99%

Emerging applications of phase change materials: A concise review of recent advances

et al. 2020

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Phase change materials (PCMs) are used as latent heat thermal energy storage materials. The fields of application for PCMs are broad and diverse. Among these areas are thermal control of electronic components and thermal building regulations. These areas are used as heat and cold storage materials. The low thermal conductivity of PCMs is one of the significant and severe technological problems of PCMs. This paper presents a review of the latest works using PCMs in the thermal management of electronic components, buildings, and heat exchangers. Besides, it provides concise pieces of information on the classification of PCMs, their advantages, disadvantages, and thermal storage systems.

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Improved PCM melting in a thermal energy storage system of double-pipe helical-coil tube

Cited by 118 publications

References 41 publications

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

Performance Analysis of a PV Powered Variable Speed DC Fridge Integrated with PCM for Weak/Off-Grid Setting Areas

Emerging applications of phase change materials: A concise review of recent advances

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