Consecutive charging and discharging of a PCM-based plate heat exchanger with zigzag configuration

Talebizadehsardari, Pouyan; Mahdi, Jasim M.; Mohammed, Hayder I.; Moghimi, M.A.; Eisapour, Amir Hossein; Ghalambaz, Mohammad

doi:10.1016/j.applthermaleng.2021.116970

Cited by 42 publications

(17 citation statements)

References 51 publications

(54 reference statements)

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“…Furthermore, studies have been developed to enhance heat transfer and energy storage applications with nano/microparticles suspended [ 19 , 20 , 21 , 22 , 23 , 24 ]. Some examples can be seen in the research of Ho et al, Forced convection heat transfer of Nano-Encapsulated Phase Change Material (NEPCM) suspension in a mini-channel heatsink [ 20 ], in which NEPCMs with particle sizes in the range of 250–350 nm were synthesized.…”

Section: Introductionmentioning

confidence: 99%

Thermal Storage of Nitrate Salts as Phase Change Materials (PCMs)

et al. 2021

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This study presents the energy storage potential of nitrate salts for specific applications in energy systems that use renewable resources. For this, the thermal, chemical, and morphological characterization of 11 samples of nitrate salts as phase change materials (PCM) was conducted. Specifically, sodium nitrate (NaNO3), sodium nitrite (NaNO2), and potassium nitrate (KNO3) were considered as base materials; and various binary and ternary mixtures were evaluated. For the evaluation of the materials, differential Fourier transform infrared spectroscopy (FTIR), scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) to identify the temperature and enthalpy of phase change, thermal stability, microstructure, and the identification of functional groups were applied. Among the relevant results, sodium nitrite presented the highest phase change enthalpy of 220.7 J/g, and the mixture of 50% NaNO3 and 50% NaNO2 presented an enthalpy of 185.6 J/g with a phase change start and end temperature of 228.4 and 238.6 °C, respectively. This result indicates that sodium nitrite mixtures allow the thermal storage capacity of PCMs to increase. In conclusion, these materials are suitable for medium and high-temperature thermal energy storage systems due to their thermal and chemical stability, and high thermal storage capacity.

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Section: Introductionmentioning

confidence: 99%

Thermal Storage of Nitrate Salts as Phase Change Materials (PCMs)

et al. 2021

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“…Unlike the inlet velocity, they found that the average velocity of the HTF has a noticeable influence on the thermal performance. Sardari et al [46] studied the modification of the LHS using a zigzag configuration. They confirm that the unit with the zigzag angle of 60 • accelerated the storage time by 1/3 times over the time of the case with a 30 • zigzag angle.…”

Section: Introductionmentioning

confidence: 99%

Solidification Enhancement in a Triple-Tube Latent Heat Energy Storage System Using Twisted Fins

et al. 2021

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This work evaluates the influence of combining twisted fins in a triple-tube heat exchanger utilised for latent heat thermal energy storage (LHTES) in three-dimensional numerical simulation and comparing the outcome with the cases of the straight fins and no fins. The phase change material (PCM) is in the annulus between the inner and the outer tube, these tubes include a cold fluid that flows in the counter current path, to solidify the PCM and release the heat storage energy. The performance of the unit was assessed based on the liquid fraction and temperature profiles as well as solidification and the energy storage rate. This study aims to find suitable and efficient fins number and the optimum values of the Re and the inlet temperature of the heat transfer fluid. The outcomes stated the benefits of using twisted fins related to those cases of straight fins and the no-fins. The impact of multi-twisted fins was also considered to detect their influences on the solidification process. The outcomes reveal that the operation of four twisted fins decreased the solidification time by 12.7% and 22.9% compared with four straight fins and the no-fins cases, respectively. Four twisted fins improved the discharging rate by 12.4% and 22.8% compared with the cases of four straight fins and no-fins, respectively. Besides, by reducing the fins’ number from six to four and two, the solidification time reduces by 11.9% and 25.6%, respectively. The current work shows the impacts of innovative designs of fins in the LHTES to produce novel inventions for commercialisation, besides saving the power grid.

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“…Paraffin RT-35 is utilized as the PCM with thermophysical properties listed in Table 1. Basically, there are several impacts that could nullify the operation of the heat energy storage, such as the limited energy density, material compatibility, properties variation during the phase-change process, corrosion, phase separation, lack of thermal stability, and inflammability [45].…”

Section: Mathematical Modelingmentioning

confidence: 99%

Melting Enhancement in a Triple-Tube Latent Heat Storage System with Sloped Fins

et al. 2021

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Due to the potential cost saving and minimal temperature stratification, the energy storage based on phase-change materials (PCMs) can be a reliable approach for decoupling energy demand from immediate supply availability. However, due to their high heat resistance, these materials necessitate the introduction of enhancing additives, such as expanded surfaces and fins, to enable their deployment in more widespread thermal and energy storage applications. This study reports on how circular fins with staggered distribution and variable orientations can be employed for addressing the low thermal response rates in a PCM (Paraffin RT-35) triple-tube heat exchanger consisting of two heat-transfer fluids flow in opposites directions through the inner and the outer tubes. Various configurations, dimensions, and orientations of the circular fins at different flow conditions of the heat-transfer fluid were numerically examined and optimized using an experimentally validated computational fluid-dynamic model. The results show that the melting rate, compared with the base case of finless, can be improved by 88% and the heat charging rate by 34%, when the fin orientation is downward–upward along the left side and the right side of the PCM shell. The results also show that there is a benefit if longer fins with smaller thicknesses are adopted in the vertical direction of the storage unit. This benefit helps natural convection to play a greater role, resulting in higher melting rates. Changing the fins’ dimensions from (thickness × length) 2 × 7.071 mm2 to 0.55 × 25.76 mm2 decreases the melting time by 22% and increases the heat charging rate by 9.6%. This study has also confirmed the importance of selecting the suitable values of Reynolds numbers and the inlet temperatures of the heat-transfer fluid for optimizing the melting enhancement potential of circular fins with downward–upward fin orientations.

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Consecutive charging and discharging of a PCM-based plate heat exchanger with zigzag configuration

Cited by 42 publications

References 51 publications

Thermal Storage of Nitrate Salts as Phase Change Materials (PCMs)

Thermal Storage of Nitrate Salts as Phase Change Materials (PCMs)

Solidification Enhancement in a Triple-Tube Latent Heat Energy Storage System Using Twisted Fins

Melting Enhancement in a Triple-Tube Latent Heat Storage System with Sloped Fins

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