Experimental investigations on the thermal performance of an ice storage system using twin concentric helical coil

Abdelrahman, H.E.; Refaey, H.A.; Alotaibi, A.; Abdel-Aziz, Ali A.; Rabbo, M.F. Abd

doi:10.1016/j.applthermaleng.2020.115737

Cited by 30 publications

(12 citation statements)

References 10 publications

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“…The rise in saline temperature from 140 °C to 155 °C is associated with a significant increase in net electricity production; the magnitude varies with air temperature. It is, in fact, more important at colder temperatures than at warmer ones [32]. The maximal temperature and pressure in the axial compressor are recommended to exceed as the saline heat raises, as is the performance and power production.…”

Section: Resultsmentioning

confidence: 99%

Thermal Storage for the Analysis of Hybrid Energy Systems Based on Geothermal and Solar Power

Aravind¹,

Mekala²,

Muthuraju³

et al. 2022

International Journal of Photoenergy

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Thermal degradation of geothermal energy occurs even during the duration of geothermal energy facilities. The enormity and efficiency of thermal energy available for electric transformation, as well as plant performance and power production, are both affected by the decrease in geofluid heat. Additionally, due to the generally increased turbine exhaust temperatures, the efficiency of geothermal energy based upon air-cooled organic Rankine cycle devices (ORCs) degrades considerably at hot room temperatures. A newly designed Geothermal-Concentrator Solar Power (GEO-CSP) station is simulated in this work, which allows for greater geothermal power use and enhances the effectiveness of the geothermal ORC system over the power plant’s lifespan. The geothermal fluid entering the ORC’s heating element is heated using the sun’s radiation. The CSP facility is fitted with a thermal energy storing unit that stores excess energy from the sun accessible throughout the day and releases it at nighttime whenever the energy system’s performance is better. When the storage facility is included in the concentrator CSP technology, the incremental yearly energy generation from solar increases by 19 percent, from 5.3 percent to 6.3 percent, similar to the geothermal-only plant. As a result, adding a TES unit to the hybrid unit could be quite beneficial.

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Section: Resultsmentioning

confidence: 99%

Thermal Storage for the Analysis of Hybrid Energy Systems Based on Geothermal and Solar Power

Aravind¹,

Mekala²,

Muthuraju³

et al. 2022

International Journal of Photoenergy

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“…In which λ represents the liquid fraction [Equation (10)], 25 which ranges in 0 ≤ λ ≤ 1. The values of 0, 1, and between 0 and 1 for this parameter indicate a solid, liquid, and medium cell, which is assumed as a porous zone:…”

Section: Governing Equationsmentioning

confidence: 99%

“…It was indicated that the fin height greatly affects the freezing rate. Abdelrahman et al 10 experimentally studied the influence of HTF flow on both freezing and melting processes of a CTES system with two concentric helical coils. They stated that the HTF temperature significantly alters the rate of the process.…”

Section: Introductionmentioning

confidence: 99%

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Afsharpanah

Pakzad

Ajarostaghi

et al. 2022

Intl J of Energy Research

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Summary Frequent power outage in developing countries has created many problems for the people living in these regions, one of the most important of which is food spoilage due to the rise of refrigerator temperature. Ice storage systems are one of the promising techniques for handling this difficulty. Computational simulations are done here to influence the effects of dimensionless parameters on the charging rate of a shell and dual coil ice storage unit equipped with connecting plates as heat transfer enhancers. The ice storage unit is intended to be used as a backup cooling source for refrigerators in these regions. The studied parameters include the helical pitch length/storage height ratio (α1), the helical coil distance/storage diameter ratio (α2), the helical coil diameter/storage diameter ratio (α3), the connecting plate length/storage height ratio (α4), the connecting plate thickness/tube diameter ratio (α5), the modified Stefan number of the refrigerant flow (Ste*), and refrigerant flow Reynolds number (Re). The results suggest that the geometrical optimization of the proposed ice storage with α1, α2, and α3 parameters can improve the charging process up to 16.69%, 7.25%, and 18.84%, respectively. Also, the presence of full‐length connecting plates can enhance the charging rate by up to 12%. While the influence of the Ste* on the charging rate is considerably high (25.56%), the Re does not exhibit a noticeable effect (0.95%). Moreover, the influence of natural convection on the process was considered, however, it was found that it does not have a considerable effect on the ice formation.

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“…Abdelrahman et al [ 22 ] experimentally analyzed the freezing and melting operations in a CES unit that consisted of two concentric coils with helical profiles. They selected a single geometry for their research and solely concentrated on the HTF flow rate and temperature.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Carbon-Based Nanomaterials and Plate-Fin Networks in a Cold PCM Container with Application in Air Conditioning of Buildings

et al. 2022

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Cold energy storage devices are widely used for coping with the mismatch between thermal energy production and demand. These devices can store cold thermal energy and return it when required. Besides the countless advantages of these devices, their freezing rate is sluggish, therefore researchers are continuously searching for techniques to improve their operating speed. This paper tries to address this problem by simultaneously combining a network of plate fins and various types of carbon-based nanomaterials (NMs) in a series of complex computational fluid dynamics (CFD) simulations that are validated by published experimental results. Horizontal, vertical, and the combination of these two plate-fin arrangements are tested and compared to the base model. Subsequently, several carbon-based NMs, including SWCNT, MWCNT, and graphene-oxide NMs are utilized to further improve the process. The influence of these fin networks, nanoparticle types, and their volume- and mass-based concentrations within the PCM container are studied and discussed. According to the results, carbon-based NMs exhibit superior performance compared to metal-oxide NMs, so that at identical NM volume and mass fractions, MWCNT particles present a 2.77% and 17.72% faster freezing rate than the CuO particles. The combination of plate-fin network and MWCNT particles is a promising technique that can expedite the ice formation rate by up to 70.14%.

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Experimental investigations on the thermal performance of an ice storage system using twin concentric helical coil

Cited by 30 publications

References 10 publications

Thermal Storage for the Analysis of Hybrid Energy Systems Based on Geothermal and Solar Power

Thermal Storage for the Analysis of Hybrid Energy Systems Based on Geothermal and Solar Power

Accelerating the charging process in a shell and dual coil ice storage unit equipped with connecting plates

Utilization of Carbon-Based Nanomaterials and Plate-Fin Networks in a Cold PCM Container with Application in Air Conditioning of Buildings

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