Experimental and numerical study of thin ring and annular fin effects on improving the ice formation in ice-on-coil thermal storage systems

Jannesari, Hamid; Abdollahi, Naeim

doi:10.1016/j.apenergy.2016.12.064

Cited by 71 publications

(28 citation statements)

References 28 publications

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“…The physical properties for the materials used in this study have been presented in Table 2. These data have been extracted from published articles [25,44].…”

Section: Physical Modelmentioning

confidence: 99%

“…Their observations indicated that with larger fins the area that was influenced by these fins were enlarged and the discharge process occurred with a higher speed. Jannesari and Abdollahi [25] studied the effects of annular fins and thin rings on improving the ice formation rate in an ice-on-coil ice storage system. The results indicated that using annular fins or thin rings could improve the formation of ice up to 21 and 34% respectively, compared to when a bare tube was used.…”

Section: Introductionmentioning

confidence: 99%

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The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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Nowadays electrical power is one of the most vital requirements for daily life and industries. Since with the rise of the human population, providing electrical energy is an important challenge, some methods should be used to reduce the electrical demand or shift the demand from peak-hours to off-peak hours. Ice storage systems are one of the devices which can be used for this purpose. In this article, a transient 3D numerical simulation was carried out to investigate the effects of two geometrical parameters of double helical coil heat exchanger in the charging process of an ice storage system with the volume of 15 L. These parameters were helical coil pitch length and the distance between inner and outer coils. The results indicated that with higher values for pitch length and inner and outer coils distance, compared to smallest values for these parameters, the distribution of formed ice in the storage improves and the rate of ice formation increases by 22.81% and 13.99%, respectively. Increasing these values can also retard the ice block formation which is an undesirable phenomenon in the external discharge process of the ice storage systems.

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“…The physical properties for the materials used in this study have been presented in Table 2. These data have been extracted from published articles [25,44].…”

Section: Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

2019

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“…Jannesari and Abdollahi [9] used two methods of thin ring and fins for improving the ice-on-coil storage system. They revealed that the ice formation was improved up to 34% while using rings and it was increased by 21% when fins were used.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of solidification process in an ice-on-coil ice storage system with serpentine tubes

2019

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Energy consumption is rising around the world and most of the activities in the developed countries are dependent on electric energy. Thermal energy storages are one the ways to reduce energy consumption and balance the electrical power usage during the day. With thermal energy storages, or to be precise, with ice storage systems, energy usage peak can the shifted from the afternoon or early night to low-load hours of morning or midnights. In this study, a 3D unsteady numerical analysis was done in order to examine an ice storage system equipped with serpentine tube heat exchanger. The influence of two geometrical parameters, namely, tube diameter and serpentine tube row distance were investigated. The examined range for diameter and the serpentine tube row spacing were 15-21 and 30-100 mm, respectively. The results showed that placing the serpentine tube rows more distant to each other increases the ice formation so that the ice formation rate for the highest serpentine tube row distance compared to when the serpentine tube row distance is the lowest is higher by 24.68%. On the contrary, with a larger tube diameter, the rate of ice formation was decreased so that the smallest diameter had almost 5.9% more ice formation rate in comparison with the case with the largest tube diameter.

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“…In addition, PCMs generally have the disadvantages of poor thermal conductivity, low energy storage/release efficiency, and a heat transfer unit that is too large, which leads to a larger temperature gradient inside the PCM during the working process, increasing the energy loss of heat transfer and hindering the application of PCMs in thermal energy storage. A wide range of approaches have been applied to enhance the heat transfer performance of PCMs, including dispersing particles [12][13][14], adding fins [15,16], metal foam [17][18][19], composite methods [20,21], and more, which have proven that adding high thermal conductivity materials in various forms improves the heat transfer performance of the PCMs to a certain extent. After optimizing their performance, PCMs will have wider application prospects in the fields of building energy conservation, waste heat recovery, thermal protection of electronic devices, solar power plants, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Melting Performance of a Thermal Energy Storage Unit with Fractal Net Fins

Zheng

Chen

et al. 2019

Processes

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In this study, fractal net fins were introduced to improve the melting performance of a thermal energy storage unit. A transient model for melting heat transfer for phase change material (PCM) was presented and numerically analyzed, to study the melting performance in a thermal energy storage unit using fractal net fins. The melting phase change process was modelled using the apparent heat capacity method. The evolutions of temperature and the liquid fraction in the thermal energy storage unit were investigated and discussed. The effects of the length and width ratios of the fractal net on melting performance were analyzed to obtain the optimal fin configuration. The results indicated that the fractal net fins significantly enhanced the melting heat transfer performance of the PCM in a thermal energy storage unit. The fractal net fins configuration was optimal when the length and width ratios of the fractal net were 0.5. The temperature response at the corner points of the fractal net fins was faster than that in the central points.

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Experimental and numerical study of thin ring and annular fin effects on improving the ice formation in ice-on-coil thermal storage systems

Cited by 71 publications

References 28 publications

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

The influence of geometrical parameters on the ice formation enhancement in a shell and double coil ice storage system

Numerical simulation of solidification process in an ice-on-coil ice storage system with serpentine tubes

Optimization of the Melting Performance of a Thermal Energy Storage Unit with Fractal Net Fins

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