• Title/Summary/Keyword: Ice Slurry Formation

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Ice Slurry Formation of a Solution in a Pressurized Plate Heat Exchanger (가압 판형 열교환기에 의한 수용액의 아이스슬러리 생성)

  • Lee Dong-Gyu;Kim Byung-Seon;Peck Jong-Hyeon;Hong Hi-Ki;Kang Chae-Dong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.7
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    • pp.596-602
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    • 2006
  • Ice adhesion and blockage problems have been issued in continuous ice slurry making process. So we composed continuous ice slurry making device using a commercial small plate heat exchanger (PHX), and investigated character of ice formation. An experiment of ice formation was peformed with an aqueous solution of ethylene glycol 7 mass%. In the experiment, the effect of the pressurization on ice slurry formation during the cooling process was investigated. The pressurization test for the aqueous solution was performed by setting valves at the PHX inlet and outlet. At the results, the time of continuous ice formation increased as the pressure of the plate heat exchanger increased for cooling temperature of $-5^{\circ}C$. Also continuous ice formation at the cooling temperature of $-7^{\circ}C$ showed a possibility. It was found that the pressurization may contribute to suppress the dissolution of supercooled aqueous solution in the PHX.

Effect of supercooling and cooling rate on a continuous ice slurry formation using a plate heat exchanger (판형 열교환기에서 유동 과냉도 및 냉각속도가 연속제빙에 미치는 영향)

  • Lee, Dong-Gyu;Peck, Jong-Hyun;Hong, Hi-Ki;Kang, Chae-Dong
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.138-143
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    • 2006
  • The peculiarity of ice slurry, such as liquidity, high heat transfer rate and easy storage can also find to supercooled type dynamic ice storage system(DISS) which is one of the DISS. However, in order to accomplish continuous ice formation in the system without mechanical moving parts, supercooled aqueous solutionshould be formed stable through cooling heat exchanger and be dissoluted in storage tank. In previous research, the time of ice slurry increased as the pressure of the cooling heat exchanger(PHX) increased. In this study, a cooling experiment of an ethylene glycol 7mass% solution was performed with various inlet temperature of the PHX, which has constant brine inlet temperature of $-7^{\circ}C$. The temperature in the storage tank maintained to freezing point of the solution. At results, the time of ice slurry formation increased as the supercooling degree decreased and the cooling rate increased.

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Influence of the Supercooling Degree and Cooling Rate on a Continuous Ice Formation by a Supercooled Aqueous Solution in Flow Using a Plate Heat Exchanger (판형 열교환기를 이용한 과냉각수용액에서 유동과냉도 및 냉각속도가 연속제빙에 미치는 영향)

  • Lee, Dong-Gyu;Peck, Jong-Hyeon;Hong, Hi-Ki;Kang, Chae-Dong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.9
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    • pp.647-653
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    • 2007
  • In dynamic ice storage system(DISS), ice slurry is formed not only from solution freezing by mechanical removing parts but also supercooled solution. However, in order to perform continuous ice formation in the system without mechanical moving parts, supercooled aqueous solution should be formed stable through cooling heat exchanger and be dissolved uniformly in storage tank. In previous study, the time of ice slurry increased as the pressure of the cooling heat exchanger(PHX) increased. In this study, a cooling experiment of an ethylene glycol 7mass% solution was performed with various inlet temperature of the PHX, which has constant brine inlet temperature of $-7^{\circ}C$. The temperature in the storage tank maintained to freezing point of the solution. At results, the time of ice slurry formation increased as the supercooling degree decreased and the cooling rate increased.

Adhesion of Ice Slurry in an Aqueous Solution Cooling with Stirring (수용액의 교반/냉각을 동반한 슬러리 얼음의 빙부착)

  • Kang, Chae-Dong;Son, Kwon;Baek, Jong-Hyun;Hong, Hee-Ki
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.12
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    • pp.1071-1077
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    • 2002
  • Ice adhesion on cooling wall is very important in continuous ice formation. The purpose of the present study is to investigate the possibilities of a three-component aqueous solution as a thermal storage material for the continuous ice formation. By freezing under stirring the solution of 300 mL in a stainless steel vessel which was immersed and cooled in a temperature controlled bath, an ice slurry was formed experimentally with measuring the temperature and stirring load variation. From the experiment, the ice adhesion was suppressed when the supercooling degree decreased and the concentration of aqueous solution increased.

Effect on the Adhesion of Ice Slurry by the Characteristic of Cooling Surface (냉각면 성상이 빙부착에 미치는 영향)

  • Seung Hyun;Hong Hi Ki;Kang Chae Dong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.2
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    • pp.183-190
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    • 2005
  • In the process of ice-slurry making, ice adhesion on cooling wall or in narrow flow Path disturbs continuous ice formation. In this study, the effect on the ice adhesion to cooling surface by some freezing experiments was investigated, quantitatively. Three types of solutions were frozen in various coating vessels with stirring. In the experiment, the ice adhesion between cooling wall and Ice-slurry was evaluated by measuring stirring power. From the result, the stirring power of slurry mixture in PTFE-coating vessel was smaller than those in PE-coating, PFA-coating and bare SUS vessel. Especially, in EG H PG 1.S/ HD 1.5 mass$\%$ solution, the stirring power in the PE-coating vessel was smaller than that in the PFA-coating or SUS vessel.

Flow pattern analysis and a study on formation of slurry ice in the reversing flow (역전 유동층 내의 유동해석 및 슬러리아이스 생성에 관한 연구)

  • Oh, Cheol;Choi, Young-Gyu
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2011.06a
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    • pp.202-202
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    • 2011
  • Thermal energy storage(TES) cooling system using cheaper electricity of off-peak time has been applied to relief a significant portion of the peak demand of electricity during the daytime in summer. Slurry ice type thermal energy storage cooling system is one kind of more efficient ice-thermal energy storage cooling system than Ice-on-Coil type or Encapsulated type TES cooling system, even though, which are more popular TES system. This study is experimented to observe flow pattern and formation of slurry ice in reversing flow to improve efficiency of heat transfer between fluid and freezing tube.

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Adhesion of Ice Slurry in a Multi-component Aqueous Solution with Stirring and Cooling (다성분계 수용액의 교반/냉각에 의한 빙부착)

  • 강채동;강용태;홍희기
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.12
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    • pp.1063-1070
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    • 2002
  • To resist ice adhesion on cooling wall is concerned to continuous ice formation in thermal storage system. In this study, ice slurries were formed with two ecological aqueous solution, one is ethanol+silanol and the other is propylene glycol+silanol. By freezing under stirring the solution of $300m\ell$ in a stainless steel vessel which was immersed and cooled in a temperature controlled bath, the shape of ice slurry and the strength of ice adhesion on wall was observed with measuring the temperature and stirring load variation. As the concentration is smaller and the supercooling degree is larger, the ice adhesion is easy to occur. When the stirring load is larger than$ 2.1\times10^{-5}W$, the ice adhesion occurred.

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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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.