A novel dual-PCM configuration to improve simultaneous energy storage and recovery in triplex-tube heat exchanger

Mozafari, M.; Lee, Ann

doi:10.1016/j.ijheatmasstransfer.2021.122420

Cited by 41 publications

(9 citation statements)

References 40 publications

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“…A 10% to 18.5% performance improvement was found in comparison to non-PCM cases. A dual-PCM configuration was implemented by Mozafari and Cheng [3] to improve the energy storage capability in a triplex-tube heat exchanger. Numerical data were verified with experimental data published in [4].…”

Section: The Current State Of Knowledgementioning

confidence: 99%

The Effect of Microencapsulated PCM Slurry Coolant on the Efficiency of a Shell and Tube Heat Exchanger

et al. 2022

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This paper describes the results of experimental studies on heat transfer in a shell and tube heat exchanger during the phase changes of the HFE 7000 refrigerant. The studies were performed using a mixture of water and a microencapsulated phase change material as a coolant. HFE 7000 refrigerant condenses on the external surface of the copper tube, while a mixture of water and phase change materials flows through the channels as coolant. Currently, there is a lack of research describing cooling using phase change materials in heat exchangers. There are a number of publications describing the heat exchange in heat exchangers during phase changes under air or water cooling. Therefore, the research hypothesis was adopted that the use of mixed water and microencapsulated material as a heat transfer fluid would increase the heat capacity and contribute to the enhancement of the heat exchange in the heat exchanger. This will enable an increase in the total heat transfer coefficient and the heat efficiency of the exchanger. Experimental studies describe the process of heat transfer intensification in the above conditions by using the phase transformation of the cooling medium melting. The test results were compared with the results of an experiment in which pure water was used as the reference liquid. The research was carried out in a wide range of refrigerant and coolant parameters: ṁr = 0.0014–0.0015 kg·s−1, ṁc = 0.014–0.016 kg·s−1, refrigerant saturation temperature Ts = 55–60 °C, coolant temperature at the inlet Tcin = 20–32 °C, and heat flux density q = 7000–7450 W·m−1. The obtained results confirmed the research hypothesis. There was an average of a 13% increase in the coolant heat transfer coefficient, and the peak increase in αc was over 24%. The average value of the heat transfer coefficient k increased by 5%, and the highest increases in the value of k were noted at Tin = 27 °C and amounted to 9% in relation to the reference liquid.

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Section: The Current State Of Knowledgementioning

confidence: 99%

The Effect of Microencapsulated PCM Slurry Coolant on the Efficiency of a Shell and Tube Heat Exchanger

et al. 2022

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“…An impending problem with the application of solar energy is that its supply fluctuates with weather conditions. Thermal energy storage (TES) systems have been introduced as an attractive way to store solar energy [2,3]. Three methods of energy storage could be applied in TES systems: sensible (change in the temperature of the storage material), latent (change in the phase of storage material), and chemical (by reversible chemical reactions).…”

Section: Introductionmentioning

confidence: 99%

“…Three methods of energy storage could be applied in TES systems: sensible (change in the temperature of the storage material), latent (change in the phase of storage material), and chemical (by reversible chemical reactions). Phase change materials (PCMs) are highly used in latent thermal energy storage (LTES) systems due to their high latent energy capacity [3][4][5]. A TES system with PCM can store 5-14 times more energy than a system using suitable storage materials of the same volume [6].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the use of multiple PCMs with different melting temperatures has been shown to significantly improve the energy storage and recovery process, which has gained increasing attention in recent years [3,12,[18][19][20]. However, when a single-PCM is used, the rate of melting or solidification in different regions of the TES is different due to the non-uniform distribution of the natural convection induced vortexes.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the case with multiple PCMs is the best arrangement due to the shorter melting time. Mozafari et al [3] investigated the effect of different arrangements of dual PCMs in a triplex tube heat exchanger, when subjected to simultaneous charging and discharging. They developed a new dual-PCM design which improved the thermal energy storage and recovery as 37.93%, and 21.06%, respectively, compared with the reference case with single PCM.…”

Section: Introductionmentioning

confidence: 99%

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Simulation Study of Solidification in the Shell-And-Tube Energy Storage System with a Novel Dual-PCM Configuration

Mozafari

Lee

2022

Energies

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This study proposes a novel dual-PCM configuration with outstanding solidification response in a horizontal shell-and-tube energy storage system. To demonstrate that the proposed PCM configuration is superior in its thermal responses, results from a range of numerical simulations are presented and compared between different configurations of dual-PCM. As the melting/solidus point is a crucial factor for the solidification rate, dual PCMs are chosen such that the average of their melting point is equal to the melting point of the single-PCM in the reference case. Additionally, equal-area sectors are considered for all cases to ensure the same quantities of PCMs are compared. The temporal liquid fraction and temperature contours reveal that solidification is delayed in the upper half of the system due to strong natural convection motions. Therefore, a dual-PCM configuration is offered to improve the solidification rate in this region and accelerate the full solidification process. Results show that placing a PCM with a lower solidus point in the lower half or an annulus-shaped zone around the cold tube can save the full recovery time up to 8.51% and 9.36%, respectively. The integration of these two strategies results in a novel and optimum design that saves the solidification time up to 15.09%.

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Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

Senthil

Punniakodi

Balasubramanian

et al. 2022

Intl J of Energy Research

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Summary Thermal energy storage (TES) plays a significant role in storing heat energy during the availability of a source. The phase change material (PCM) storage density is high, but its meager thermal conductivity leads to ineffective heat transfer. This mathematical modeling work simulates two different heat transfer tube (HTT) arrangements in a horizontal cylindrical container to melt the PCM using the enthalpy‐porosity method. Case‐1 with a single HTT at the centroidal axis and Case‐2 with multiple tubes spread radially. Cases‐1 and 2 are observed with melting and solidification duration of 39.8 and 184 minutes, and 69.83 and 292.5 minutes respectively. Case‐1 has a shorter melting and solidification time because of the optimal HTT location. Case‐2 is observed with a high heat storage density of 224.95 MJ/m3, compared to Case‐1 with 224.571 MJ/m3. Nusselt number is higher for Case‐2 (385.86) during charging and higher for Case‐1 (208) during discharging. Nusselt number initially varies for both cases due to effective heat convection at the start; however, Case‐1 has a shorter melting duration with its energy density lower than the Case‐2. Based on the obtained results, it could be suggested that Case‐1 could be applicable when simultaneous heat transfer requires less energy storage and a faster melting rate, while Case‐2 could be used in places that demand a higher storage density.

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A novel dual-PCM configuration to improve simultaneous energy storage and recovery in triplex-tube heat exchanger

Cited by 41 publications

References 40 publications

The Effect of Microencapsulated PCM Slurry Coolant on the Efficiency of a Shell and Tube Heat Exchanger

The Effect of Microencapsulated PCM Slurry Coolant on the Efficiency of a Shell and Tube Heat Exchanger

Simulation Study of Solidification in the Shell-And-Tube Energy Storage System with a Novel Dual-PCM Configuration

Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

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