Ice storage system Research Papers (original) (raw)

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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- Heat Exchanger, Phase Change Materials (PCM), Ice storage system, Ice formation

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.

- by Seyed Soheil Mousavi Ajarostaghi
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- Solidification, Helical Coil, Ice storage system, Ice formation

There is a growing interest in sustainable energy sources for energy demand growth of power industries. To align the demand and the consumption of electrical energy, thermal energy storage appears as an efficient method. In the summer days, by using a cold storage system like ice storage, peaks of the energy usage shift to low-load hours of midnights. Here, we investigate the charging process (namely solidification) numerically in an ice-on-coil thermal energy storage configuration, where ice is formed around the coil or tube to store the chilled energy. The considered ice storage system is a shell and tube configuration, with three kinds of tubes including a U-shaped tube, a coil tube with an inner return line, and a coil tube with an outer return line. Advanced 3D unsteady simulations are achieved to determine the effects of tube type and position of the ice storage (horizontal or vertical) on the solidification process. Results indicate that using a coil tube speeds up the ice fo...

Energy is one of the key factors for development of the country, and it can be gained from dif erent sources, but some of these sources are not environmental friendly, expensive and dif icult to transport; like fossil fuel. Using solar energy is the best option to solve these problems. Ethiopia has huge potential for solar energy because it is located close to the equator. Refrigerator is one of the essential tools used in daily. Especially refrigerator is very required for the people who live in desert area for cooling water. The people living in grid connected system use electric powered refrigerator for cooling water, but people living in desert of -grid area can't get electric powered refrigerator. Therefore this problem would be solved when they use solar powered refrigerator. In this work Dire Dawa Shinile is study area of this paper. It is located at 9.68latitude and 41.85 Longitude. One of the major drawbacks of solar refrigerator technology has been the large battery systems that were required to store the sun’s energy for use during the night and cloudy periods. These batteries have a relatively short life time and replacements are expensive. In this work solar power refrigerator optimization is eliminates the expensive energy storage batteries and PV sizing for solar powered refrigerator depending on power requirement of compressor by using PVsyst software. Freeze water to make ice in ice storage tank by using the sun's energy which operate compressor of refrigerator and then by using these ice storage to cooling water drink, during solar energy couldn't drive compressor. The net capacity of the refrigerator use for cooling water is 33L and an ice storage of 1kg, is able to maintain 6 liter of water drink temperature below 5 as comfortable for drink. The initial cost of solar powered refrigerator is 13,266birr and this cost would be obtained back after one year. Solar powered refrigerator system can be reliably used at where the local grid is not continuously available whereas refrigeration need is critical.