• Journal of Energy Engineering
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• v.19 no.4
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• pp.234-239
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• 2010

Heat transfer characteristics were experimentally investigated for ice slurry which was made from 6.5% ethylene glycol-water solution flowing in the circular pipe. The test section was made of a copper tube of 13.84 mm inner diameter and 1,500 mm length. The ice slurry was heated by passing hot water through an annulus surrounding the test section. The ice packing factor(IPF) and the mass flux of the experiments were varied from 0 to 25% and from 1,000 to 3,000 kg/$m^2s$ respectively at a fixed hot water temperature and flow rate. The measured heat transfer rates increase with the mass flow rate and IPF; however the effect of IPF appears to be minor at high mass flow rate. At the low mass flow rate condition, a sharp increases in the heat transfer coefficient was observed when the IPF was above 15 ~ 20%. And finally the measured heat transfer coefficients were compared with those calculated from the correlations.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.662-667
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• 2009

The research are performed to check the characteristics of the ice slurry transport system for the district cooling. The system are installed at the 1st floored building which is as large as the $1204\;m^2$ ($86\;m{\times}14\;m$), and the pumping power and branching characteristics are measured by transporting of the ice slurry. The ice slurry transporting pipe is as long as 200 m. For the same cooling load, the higher IPF is, the lower the transporting flow rate and the pumping power are. But when the IPF is higher than 15%, no less decrease of the pumping power does happen. For the branching characteristics, through the branch pipe where the flow resistance is higher, the higher IPF is measured. A little higher IPF is measured at the thermal expansion branch.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.12
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• pp.825-832
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• 2008

The ice slurry maker which can produce the ice slurry well for the ice particle in-flowing condition was revised. We removed the stagnant region at the top of the ice slurry maker, and IPF 40% could be realized. The IPF controller with 6 mm diameter holes at the bottom was designed. But the IPF controller with only 6 mm diameter holes could not control IPF in a pipe. This is because the ice particles at ice slurry flow exist homogeneously not only at the upper part but also at the bottom part. We changed the hole size of IPF controller surface using fine meshes and then, IPF in a pipe was increased by 70% when the hole size was $80{\mu}m$ and less.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.40 no.12
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• pp.46-63
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• 2011

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.42 no.12
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• pp.64-70
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• 2013

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.9 no.2
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• pp.134-143
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• 1997

A theoretical and experimental study has been performed to investigate the characteristics of ice-slurry product. By diffusion-controlled model, the possibility of ice slurry has been theoretically anticipated. The water vapor evaporated from the surface of droplets is extracted continuously from the chamber by a vacuum pump. The droplet diameter was measured by silion immersed method. The ice slurry has been obtained by spraying droplets of ethylene-glycol aqueous solution in the chamber where pressure is maintained under the triple point of water. The droplet of which the diameter is $300{\mu}m$, and the initial temperature is $20^{\circ}C$, was changed into ice particle within the chamber of which the height is 1.33m.

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.260-265
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• 2001

This paper describes total flow control of an ice slurry system for pump energy saving. Similar turbo machinery has a characteristic that input power ratio is proportional to the three time of revolution speed ratio. To reduce the energy cost of brine pump in ice slurry storage systems, inverter is adapted instead of 3-way valve to control the speed of brine pump motor. One type of cooling load profile was used as driving load of the system, generated by a boiler and warm water storage tank. As results of the laboratory test, energy consumption and cost of the pump were reduced by 11.4%.

• Proceedings of the KSME Conference
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• 2000.11b
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• pp.130-135
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• 2000

To enhance heat transfer characteristics of water, fine ice was added to it. The convective heat transfer characteristics of the ice slurry were investigated in a flow loop with a constant heat flux test section. The Nusselt number and Fanning friction coefficient of water flow were found to be similar to the expected curve by Petukhov. The Nusselt number of the ice sin flow was higher than the Nusselt number of water. Effective thermal capacity of the 10.84% ice slurry was found to have 2.39 times of the thermal capacity of water.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.401-402
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• 2002

The flow characteristics of ice slurry which was made from $6.5{\%}$ ethylene glycol-water solution flowing in the special pipings including the enlargement, the contraction and the orifice were experimentally investigated. The flow patterns and the pressure drops were measured in acrylic pipes when the fraction of ice were varied from $0\;to\;30{\%}$. The pressure drop behavior of the contraction and the orifice appears to be similar to that of the elbow pipe, since these piping may provide similar frictional resistance to the elbow. In the mean while, the pressure drop increased unexpectedly high with the Ice fraction in the enlargement pipe. It seems that the onset of sharp increase in the pressure drop depends on the flowing time as well as the ice fraction and the flow rate.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.984-989
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• 2009

The present study has been conducted to predict the temperature distribution in the core of the scraper type ice generator. The analytic model was simplified as the flow in the annular type cylinder, which had an inside wall moving in axial direction due to the rotation of screw and a fixed outside wall. The governing equations were arranged by the method of separation of variables. The results corresponded to the exact solutions of the Bessel function. The qualitative results such as general characteristics of heat transfer in annulus flow from outer cylinder wall to the inside wall were obtained. However the amount of the heat transfer was underestimated as low as $1/5{\sim}1/6$ of the designed value.