A numerical study on effects of heat transfer fluids, copper mesh in packed bed and porosity, on charging time of paraffin based packed bed thermal energy storage

Rabbi, Jawad; Asif, Muhammad

doi:10.1002/est2.254

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…In fact, using the smaller encapsulation is one method to decrease the void fraction of packed bed system. In the similar study, Rabbi and Asif 29 numerically investigated the effects of porosity on the charging time; it was found that by reducing the porosity, charging and discharging time was reduced. Many researchers have reduced the porosity by introducing sensible heat storage medium into voids of the packed bed.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of porosity gradient and staggered arrangements in packed bed thermal energy storage

Asif,

Rabbi,

Bibi

2023

Energy Storage

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Owing to the intermittent nature of solar energy, the thermal energy from the sun or waste heat can be stored in the form of latent heat in a packed bed of phase change material (PCM). In this article, PCM‐based latent heat thermal energy storage is experimentally investigated, and the effects of porosity and specific surface area (ratio of surface area to the volume of the encapsulation) on the charging and discharging times are evaluated in packed bed thermal energy storage. Locally available paraffin wax was utilized as PCM. Differential scanning calorimetry (DSC) was used to investigate the thermal properties of paraffin wax. Enthalpy of phase change, melting point, and specific heat capacity of the paraffin wax were obtained by using DSC. Experimental results revealed that there was a 17% decrease in the charging time when porosity was reduced from 0.568 to 0.485, and the corresponding surface area was 2.581 and 3.4546 m2/m3, respectively.

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Section: Introductionmentioning

confidence: 99%

An experimental investigation of porosity gradient and staggered arrangements in packed bed thermal energy storage

Asif,

Rabbi,

Bibi

2023

Energy Storage

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“…Porous media in PCMs improves the temperature field's uniformity and reduces the PCM's melting time. Rabbi and Asif [10] studied numerically a configuration of the LHTES module based on the packed bed of encapsulated PCM integrated with copper mesh as porous media. The results indicated that when the water was used as HTF, it took 11 hours to completely charge the system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Solar Water Heater Integrated with Thermal Battery Using Phase Change Material and Porous Media

et al. 2023

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Evacuated tube heat pipe solar collector as a passive solar water heating system is a simple, reliable, and cost-effective way to capture the sun’s thermal energy to supply hot water to homes. In the proposed system, the manifold is reshaped to a tank and filled with phase change materials (PCM) and porous media, which the PCM acts as a latent heat thermal energy storage medium. In order to increase the heat flux from the heat pipe to the PCM and overcome the low thermal conductivity of the PCM, porous media is used. The porous media is connected to the heat pipe condenser to collect the heat and distribute it uniformly throughout the PCM filling the pores. This design of the manifold acts as a heat storage tank or thermal battery. Another pipe in the tank transfers heat from the PCM to the water. Experiments were conducted in 2 modes: charging/discharging and periodic draw-off. The results demonstrated that this thermal battery design could provide homes with the hot water they require on sunny days, while it needs an auxiliary heater or larger solar collector to provide enough hot water on rainy/cloudy days. Considering the solar radiation fluctuation, the efficiency of the thermal battery is 50% ± 9.3%. The thermal battery can warm up the cold water higher than the operating temperature on a sunny day (more than 120 L per day at 38 °C). Using porous media provides better heat distribution in the PCM.

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A numerical study on effects of axially and radially cascaded phase change material on charging/discharging time of paraffin based packed bed thermal energy storage

2021

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This study manifests the improvement in the charging and discharging time of the encapsulated PCM arranged in packed bed thermal energy storage. The combined effect of the aspect ratio (ratio of height to diameter of the packed bed) and cascaded configurations of phase change materials (PCMs) integrated with the solar water heating system is analyzed numerically. The mathematical model is validated by the experimental study available in the literature. Initially, an optimal aspect ratio of the packed bed is predicted for charging/discharging. And then, PCMs are arranged in different layers in the packed bed based on the optimal aspect ratio to analyze the combined effect of PCM configurations and optimal aspect ratio. The charging and discharging time were decreased with an increasing aspect ratio to 2.5. Afterward, an increased aspect ratio showed a trivial change in the charging and discharging time of latent heat thermal energy storage (LHTES). Furthermore, at an optimal aspect ratio of 2.5, PCMs were arranged in the packed bed with both axial (parallel) and combined axial‐radial layers (parallel and series) to see the impact of the cascaded configuration. Charging and discharging time of combined axial‐radial layers configuration was respectively found to be 17.21% and 18.5%, less than charging time without layers.

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A numerical study on effects of heat transfer fluids, copper mesh in packed bed and porosity, on charging time of paraffin based packed bed thermal energy storage

Cited by 4 publications

References 27 publications

An experimental investigation of porosity gradient and staggered arrangements in packed bed thermal energy storage

An experimental investigation of porosity gradient and staggered arrangements in packed bed thermal energy storage

Experimental Investigation on Solar Water Heater Integrated with Thermal Battery Using Phase Change Material and Porous Media

A numerical study on effects of axially and radially cascaded phase change material on charging/discharging time of paraffin based packed bed thermal energy storage

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