• Title/Summary/Keyword: Ice storage tank

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An Experimental Study on Thermal Characteristics between Cooling Fluid and Ice Ball during Charging and Discharging Precesses (빙축 및 냉방열과정중 냉각유체와 Ice Ball사이의 열적 특성에 관한 실험적 연구)

  • 박경원;박이동;황영규;김윤제
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1996.10b
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    • pp.193-205
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    • 1996
  • This paper deals with experimental study on thermal characteristics that a cooling fluid is affected to ice ball as being measuring the temperature in storage tank and ice ball governing the rate of heat storage. Distributor was taken as inlet geometry factor. flow rate of cooling fluid which was a brine were 2, 4, and 6LPM, and 8, 10, and 12$^{\circ}C$ in the temperature difference for dynamic factors with respect to three ice ball types(103, 96, 76mm). In case of in flowing cooling fluid, since inertia force is suppressed by lower flow rate the amount of heat was transferred to ice ball by heat conduction high because density difference is high. And in case of larger ice ball, a long-term storage was available because reaching time at steady state is relatively long. consequently, smaller ice ball could be suitable to a short-term storage.

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Comparative analysis of the minimum capacity of an ice-on-coil thermal storage system for various operation strategies (관외 빙착형 빙축열시스템의 운전방식에 따른 최소용량 비교)

  • 이대영;정성훈;강병하
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.3
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    • pp.401-413
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    • 1999
  • An ice storage cooling facility with cooling capacity of 150㎾ has been constructed for the purpose of developing optimal design and control strategy for an ice storage system. As the first step to this purpose, a computer program has been developed to simulate the operation of the ice storage system and examined precisely by comparing the results with those measured from the test facility. With the simulation program verified from the comparison, a design procedure has been developed to determine the minimum capacity required for each operation strategy available commercially. It is shown that the minimum sizes of the chiller and the storage tank are strongly dependent on the control strategy, i.e., chiller priority or storage priority, but less affected by the arrangement method, i.e., chiller upstream or chiller downstream.

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The Operation Characteristics and Cost Analysis of an Ice Thermal Storage System (빙축열 냉방시스템의 운전특성 및 비용 분석)

  • Ahn Young Hwan;Kang Byung Ha;Kim Suk Hyun;Lee Dae Young
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.156-164
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    • 2005
  • A comparative analysis of an ice storage system has been performed on the operation cost for the four control strategies, i.e., chiller priority and chiller downstream, chiller priority and chiller upstream, storage priority and chiller upstream, storage priority and chiller downstream. Main components of the ice storage system are an ice-on-coil storage tank and a screw compressor chiller. With the simulation program, the operation cost has been evaluated from the economics of an ice storage system. It is found that the operation cost of the ice storage system is strongly dependent on the control strategy, i.e., chiller priority or storage priority, but less affected by the arrangement method, i.e., chiller upstream or chiller downstream. In case of the maximum load day, the control strategy with chiller priority and chiller upstream is supposed to obtain the reduction of operation cost. However, it is found that the control strategy with storage priority and chiller downstream is the best economical operation for most summer seasons except the maximum load day.

An Experimental Study on the Thermal Characteristics of Ice Storage Tank - Focusing on the Adiabatic Effects of Ice Storage Tank - (직접접촉식 빙축열조의 전열특성에 관한 연구 - 빙축열조의 단열영향을 중심으로 -)

  • Lee, Chae-Moon;Park, Jung-Won;Cho, Nam-Chul;Park, Sang-Rok;Kim, Il-Gyoum;Kim, Dong-Chun;Kim, Young-Ki;Yim, Chang-Soon
    • Solar Energy
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    • v.17 no.2
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    • pp.75-89
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    • 1997
  • In this paper, the operating thermal characterictics of liquid-ice was expeimentally investigated in an adiabatic and a non-adiabatic direct contact liquid-ice heat exchanger. Experiments were carried out varing inlet temperature, Ice Packing Factor, and the flow rate of heat transfer fluid. The higher inlet temperature and the more much inlet flow rate, thermal stratification in liquid-ice heat exchanger was established faster. In the case of adiabatic ice storage tank, temperature distribution was a little higher at all conditions than that of non-adiabatic one. The ratio of latent energy to total discharge energy($E_{\lambda}/E_[tot}$) was about 80%, and the discharge of latent heat energy was appeared rapidly as inlet temperature and flow rate were higher.

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A Study on Formation of Slurry Ice by using the Reversing Flow in a Bundle of Tube (역전 유동층을 이용한 관군 내에서의 슬러리아이스 생성에 관한 연구)

  • Oh, Cheol;Choi, Young-Gyu
    • Journal of Navigation and Port Research
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    • v.35 no.5
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    • pp.365-370
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    • 2011
  • The ice-thermal energy storage cooling system has been applied to relief a significant portion of the peak demand of electricity during the daytime in summer. Slurry ice type system is one kind of ice-thermal storage cooling system utilizing cheaper off-peak electricity. This study is experimented to observe an influence of experimental conditions on production characteristics of slurry ice by using reversing flow, which is putting reversing material into test section to disturb ice adhesion. At this experiment, poly propylene ball of dimeter 10 mm was used as reversing material, and ethylene glycol-water solution of 20wt% concentration was used as flow material. The experimental apparatus was constructed of the slurry ice making and storage tank(test section), the brine tank, pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter, data logger for fluid temperature measuring. The experiments were carried out under various conditions, with volumetric flow rate, ball filling rate and air filling rate.

A study on Characteristics of Heat Flow of Low Temperature Latent Thermal Storage System (저온 잠열 축열조내의 열유동 특성에 관한 연구)

  • Lee, W.S.;Park, J.W.
    • Solar Energy
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    • v.19 no.4
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    • pp.33-43
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    • 1999
  • The study on ice thermal storage system is to improve total system performance and increase the economical efficiency in actual all-conditioning facilities. To obtain the high charging and discharging efficiencies in ice thermal storage system, the improvement of thermal stratification is essential, therefore the process flow must be piston flow in the cylindrical type. With the relation of the aspect ratio(H/D) in the storage tank, the stratification is formed better as inlet flow rate is smaller. If the inlet and the outlet port are settled at the upside and downside of the storage tank, higher storage rate could be obtainable. In case that the flow directions inside the thermal storage tank are the upward flow in charging and the downward in discharging, thermal stratification is improved because the thermocline thickness is maitained thin and the degree of stratification increases respectively. In the charging process, in case of inlet flow rate the thermal stratification has a tendency to be improved with the lower flow rate and smaller temperature gradient in case of inlet temperature, the large temperature difference between inflowing water and storage water are influenced from the thermal conduction. The effect of the reference temperature difference is seen differently in comparison with the former study for chilled and hot water. In the discharging process, the thermal stratification is improved by the effect of the thermal stratification of the charging process.

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An Experimental Study on tee Heat Transfer Enhancement Effect of the Coil Fins for Ice Storage System (빙축열 시스템에서의 코일 휜의 열전달 촉진 효과에 관한 실험적 연구)

  • 성병호;이분희;임광빈;김철주
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2004.05a
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    • pp.219-224
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    • 2004
  • The present study was to investigate the heat transfer enhancement effect of coil wire fins in an ice storage system. For the two cases of tubes with internal brine flows, a finned tube with coil wires on its outer surface and a smooth tube, the rates of ice layer were tested and compared for both the icing processes. The coil fins were made of a stainless steel wire with a dia. of 2.0(mm), and the coil had an outer dia. of 10(mm) and a helix angle of 60($^{\circ}$). The experimental results showed that the coil fins could substantially reduce the thermal resistance of the ice layer, and enhance the heat flow rates between the water in the storage tank and the brine. The ice storing time was found to be shortened by 13(%) for the coil fins to get the same amount of ice layer that was built on the smooth tube wall for 10 hours of operation when the same thermal conditions were provided.

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Experimental Study on the Cold Storage of Spherical Capsules in the Cylindrical Tank (원통형 축냉조내 구형캡슐들의 축냉에 관한 실험 연구)

  • ;;Jung, Gab Yong
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.10
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    • pp.2647-2656
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    • 1995
  • The present work was performed to axially and radially investigate the local cold storage performance in the cylindrical tank with the spherical capsules inserted n-Tetradecane as a new cold storage material. The local cold storage performance of the capsules in the tank was experimentally investigated for the inlet temperature of -7, -5, -3, 0.deg. C, for the flow rate of 0.95, 1.89, 2.84, 6.00 l/min, and for the diameter ratio of 4.9, 9.0, 13.1. The local cold storage performance in the case of using water applied for the commercial ice-ball system was axially investigated by changing the flow rate only with the inlet temperature of -7.deg. C and the diameter ratio of 9.0 in order to compare with the performance in the case of using n-Tetradecane. For the case of using n-Tetradecane, the difference of cold storage period between the first and the seventh story was increased as the inlet temperature was increased and the flow rate was decreased. The capsules at the center of the tank showed the supercooling and the increased cold storage period compared with the capsules at the wall of the tank due to the small porosity and insufficient cold storage performance at the center of the tank as the diameter ratio is increased. The case using water showed worse cold storage performance due to comparatively large supercooling than the case using n-Tetradecane.

A study on formation of slurry ice by the reversing flow (역전 유동층에 의한 슬러리아이스 생성에 관한 연구)

  • Oh, C.;Mun, S.B.;Choi, Y.G.
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.3
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    • pp.376-381
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    • 2006
  • This study is experimented to observe an influence of experimental conditions on production characteristics of slurry ice by putting ball into test section to disturb ice adhesion. And at this experiment it used ethylene glycol-water solution and the concentration is 20wt%. The experimental apparatus was constructed of ethylene glycol-water solution and slurry ice storage tank. brine tank, pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter data logger for fluid temperature measuring and a vertical circular tube with two copper tubes as test section. The experiments were carried out under various conditions, with mean velocity of fluid at the entry ranging from 0.07 to 0.13m/s and ball diameter is 10mm, 15mm. Also ball filling rate is 33%, 50%.

An experimental study on formation of slurry ice in reversing flow (역전 유동층 내에서의 슬러리아이스 생성에 관한 실험적 연구)

  • Choi, Young-Gyu;Yoon, Seok-Hun;Oh, Cheol
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.49-50
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    • 2006
  • This study experimented to observe an influence of experimental conditions on production characteristics of slurry ice by putting ball into test section to disturb ice adhesion. And at this experiment it used ethylene glycol-water solution and the concentration is 20wt%. The experimental apparatus was constructed of ethylene glycol-water solution and slurry ice storage tank, brine tank. pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter, data logger for fluid temperature measuring and a vertical circular tube with two copper tubes as test section. The experiments were carried out under various conditions, with mean velocity of fluid at the entry ranging from 0.07 to 0.13m/s and ball diameter is 10mm, 15mm. Also ball filling rate is 33%, 50%.

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