Numerical study of melting and solidification in a wavy double-pipe latent heat thermal energy storage system

Shahsavar, Amin; Ali, Hafız Muhammad; Mahani, Roohollah Babaei; Talebizadehsardari, Pouyan

doi:10.1007/s10973-020-09864-9

Cited by 43 publications

(8 citation statements)

References 44 publications

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“…Furthermore, the effects of the HTF temperature were investigated comprehensively as the only effective parameters of the HTF. For the effect of the HTF Reynolds number, it was proved that by increasing the Reynolds number, the rate of heat transfer from the HTF to the PCM increases due to the higher convection heat transfer which has been widely established in the literature and therefore it is not investigated quantitatively in this study [ 55 , 56 , 57 , 58 ]. Furthermore, as mentioned, for high flow rates of the HTF, the assumption of considering constant wall temperature is meaningful [ 59 ] and increasing the velocity has a negligible effect as mentioned in different papers in the literature [ 42 , 48 , 59 ].…”

Section: Problem Descriptionmentioning

confidence: 99%

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

et al. 2020

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Applying a well-performing heat exchanger is an efficient way to fortify the relatively low thermal response of phase-change materials (PCMs), which have broad application prospects in the fields of thermal management and energy storage. In this study, an improved PCM melting and solidification in corrugated (zigzag) plate heat exchanger are numerically examined compared with smooth (flat) plate heat exchanger in both horizontal and vertical positions. The effects of the channel width (0.5 W, W, and 2 W) and the airflow temperature (318 K, 323 K, and 328 K) are exclusively studied and reported. The results reveal the much better performance of the horizontal corrugated configuration compared with the smooth channel during both melting and solidification modes. It is found that the melting rate is about 8% faster, and the average temperature is 4 K higher in the corrugated region compared with the smooth region because of the large heat-exchange surface area, which facilitates higher rates of heat transfer into the PCM channel. In addition to the higher performance, a more compact unit can be achieved using the corrugated system. Moreover, applying the half-width PCM channel accelerates the melting rate by eight times compared to the double-width channel. Meanwhile, applying thicker channels provides faster solidification rates. The melting rate is proportional to the airflow temperature. The PCM melts within 274 s when the airflow temperature is 328 K. However, the melting time increases to 460 s for the airflow temperature of 308 K. Moreover, the PCM solidifies in 250 s and 405 s in the cases of 318 K and 328 K airflow temperatures, respectively.

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Section: Problem Descriptionmentioning

confidence: 99%

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

et al. 2020

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“…Shahsavar et al have investigated melting and solidifcation in a wavy double pipe latent heat thermal energy storage system as numerically. Results determined that effect of waviness on the pumping power is very low for dimensionless wavelengths higher than 2 [18]. Bechir et al examined heat and mass transfer enhancement by using binary nanofluid in NH 3 /H 2 O bubble absorption processes.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of absorption cooling system with LiBr-Al2O3/water nanofluid using solar energy

Kılıç

Ipek

2022

THERM SCI

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Together with the developing nano technology, nano-fluids and nano-particles are used as working fluid in energy applications. It is foreseen that nanoparticles have high heat conduction coefficient and it will increase system performance by using as a working fluid in energy systems. Many studies in the literature show that nano fluids increase the heat transfer rate by improving heat transfer. In this study, a performance analysis of an absorption cooling system using solar energy was performed as numerically. LiBr-Al2O3/water nano-fluid has been used in the cooling system as working fluid. The thermodynamic values and calculations used in the analyses were performed with Engineering Equation Solver program. Heat load necessary for the generator is provided with a flat plate solar collector. For different operation condition, the variation of COP values was determined depend on Al2O3/water nanoparticle concentration ratio. When the Al2O3/water nanoparticle concentrations are changed as 0%, 0.5% and 0.1%, it was determined that the COP values increased. Nanoparticles added to the refrigerant at certain concentration values affects the COP values positively of cooling systems. Maximum COP value is 0.86 for 85?C generator temperature and 0.1% Al2O3/water nanoparticle concentration. The lowest COP value was obtained for the 75 oC generator temperature. When the Al2O3/water nanoparticle concentration was increased together with the generator temperature, COP values also increased. When the nanoparticle concentration of the working fluid increases, the viscosity of the nanofluid can be increases. Due to, increased viscosity increases the pressure drop in the flow channel and the pump power required for the flow. Thus, 'minimum viscosity with maximum thermal conductivity' optimisation in applications is very important.

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“…Composites of PCM can be used to enhance the heat transfer process during phase change. The energy storage process can be even faster by increasing the convection heat transfer with selecting the appropriate geometry of heat exchange device 11–14 . Therefore, to improve the charging process, the PCM heat exchangers are used.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on latent heat thermal energy storage in a phase change material using a heat exchanger

et al. 2021

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The use of a heat exchanger using phase change material (PCM) is an example of latent heat thermal energy storage (LHTES). In this study, the charging of PCM (RT50) is studied in a double pipe heat exchanger. The designing of the heat exchanger needs to be optimized for operating and boundary conditions to store latent heat efficiently. The size of the equipment and the amount of PCM are also important to calculate the latent heat storage capacity of the LHTES device. In this study, the amount of PCM taken is quite high to avoid sensible heat transfer and to maximize the heat content of PCM. The charging process of PCM is numerically simulated using an enthalpy‐porosity model. The study includes the effect of inlet temperature and flow rate of high‐temperature‐fluid (HTF) and concludes that both play an important role in determining the charging time. The continuous increase in inlet temperature of HTF can decrease the charging time of PCM in the heat exchanger. However, the continuous increase in the HTF flow rate cannot show the same effect. The charging time can only be minimized with a specified flow rate regime for a specific inlet temperature of HTF. These factors consequently affect the efficiency of the heat exchanger.

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Numerical study of melting and solidification in a wavy double-pipe latent heat thermal energy storage system

Cited by 43 publications

References 44 publications

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

Thermodynamic analysis of absorption cooling system with LiBr-Al2O3/water nanofluid using solar energy

Numerical investigation on latent heat thermal energy storage in a phase change material using a heat exchanger

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