• 제목/요약/키워드: Ice thermal storage

검색결과 92건 처리시간 0.021초

수중 하베스트형 빙축열시스템의 축방냉 특성 실험 (Experiment on the Charge and Discharge of Thermal Energy for Under-Water Harvest-Type Ice Storage System)

  • 김재돌
    • 한국태양에너지학회 논문집
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    • 제22권2호
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    • pp.11-17
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    • 2002
  • This paper is concerned with the development of a new method for making, separating ice and storage floated ice by installing an evaporation plate at under-water within a storage tank. In a conventional harvest-type ice storage system, a tank saves ice by separating an ice from an installed evaporation plate, which is located above an ice storage tank as an ice storage system. Developed new harvest-type method shows good heat transfer efficiency than a convectional method. It is because the evaporation panel is directly contacted with water in a storage tank. Also, at a conventional system a circulating pump, a circulating water distributor and a piping are installed, however these components are not necessary in a new method. In this study ice storage systems are experimentally investigated to study the charge and discharge of thermal energy. The results show the applicable possibility and performance enhancement of a new type.

빙축열조 성능향상에 관한 연구 (A Basic Study for Improvement of Performance of Ice Thermal Storage in Ice Storage Tank)

  • 박정원;이원섭
    • 태양에너지
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    • 제19권4호
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    • pp.11-20
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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 air-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. In the influence of the inlet port type, the inflowing water in the distributor type diffuses through the whole storage tank more than in the slot type. In case of the flow process in the ice storage tank, the upward flow type in the charging process and the downward flow type in the discharging process make the stratification well, thereby the loss of energy wored be smaller. The influence of the inlet temperature difference and the change of the inlet flow rate is intensive when the temperature difference is larger, the flow rate is smaller in case of charging and the results are opposite in case of discharging with the reason that the good coduction condition. The total effeciency of the ice thermal storge system is 73% on condition that the porosity in the thermal storage tank is 0.55. This result shows that cylinderical ice storage tank has better storage capacity than rectangular type in case of the same porosity.

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빙축열시스템의 실질적인 최대 축열 가능량 예측 (Prediction of practically chargeable cold energy in an ice storage system)

  • 이대영;강병하;김민수
    • 설비공학논문집
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    • 제11권1호
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    • pp.133-146
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    • 1999
  • The charge operation of an ice storage system has been analyzed in this paper. The thermal characteristics of major components of the ice storage system. i.e., the refrigerator and the ice storage tank are evaluated from performance tests on an existing ice storage system. Based on the measured data for thermal characteristics, a simulation is carried out for the charge operation and the effect of the refrigerator size on the system performance is investigated. The results indicate that the larger the refrigerator size for a given storage capacity, the lower the inlet temperature of the ice storage tank so that the lower the efficiency of charge operation. It is also found that there exists an optimal size of the refrigerator with which the ice storage at the end of the charge operation is maximized, but the complete charge is not possible even with the optimally sized refrigerator. This leads to the result that the design capacity of the storage tank should be larger than the required amount of cold energy for the daytime cooling considering the practically chargeable amount of cold energy during the nighttime. Where the cooling load sharing of the storage is 40%, the nominal capacity of an ice storage tank needs to be larger than the required storage amount by 30%.

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Ice Ball을 내장(內裝)한 빙축열조내(氷蓄熱槽內)의 열유동(熱流動) 특성(特性)에 관한 실험적(實驗的) 연구(硏究) (An Experimental Study on Characteristics of Heat Flow in the Cylindrical Storage Tank with Ice Ball)

  • 장영근;이원섭;박정원
    • 태양에너지
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    • 제18권1호
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    • pp.99-109
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    • 1998
  • 공기조화 설비에 있어서 시스템의 성능을 향상시키고 에너지의 유효이용 및 경제성을 높일 수 있는 빙축열 시스템에 대한 연구이다. Ice Ball을 내장한 빙축열조를 횡형 사각형과 입형 원통형 축열조에 대하여 조내로 유입하는 브라인의 유량(2, 4, 6LPM)과 온도(-3, -5, $-7^{\circ}C$)를 변화시키고, 또한 유입 브라인의 유동을 상 하향유동으로 하면서 빙축열조내의 온도분포를 파악하여 열유동 특성 및 빙충전율에 대하여 고찰하였다. 연구결과 빙축열조내 열성층을 향상시키기 위해서는 조내 유입 브라인의 유동이 상향 압출흐름이어야 한다는 것을 알았다.

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수중 하베스트형 빙축열 시스템의 축방냉 특성 (Experiment of Characteristic on the Charge and Discharge of Cold for In-Water Harvest-Type Ice Storage System)

  • 장용식;최인수;문춘근;천석현;김재돌;윤정인
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집B
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    • pp.268-273
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    • 2001
  • A fundamental study on the harvest-type ice storage system applied ice making method in-water and its temperature characteristics in ice storage system was performed experimentally of the charge and discharge of cold. This paper is concerned with the development of a new method for making and separating ice and saving floated ice by installing an evaporation plate at in-water within a storage tank. In a conventional harvest-type ice storage system, a tank saves ice by separating a formed ice from an installed evaporation plate, which is located above an ice storage tank as an ice storage system. A new harvest-type method shows very good heat transfer efficiency than a convectional method. It is because the evaporation panel is directly contacted with water in a storage tank. Also, at a conventional system a circulating pump, a circulating water distributor and a piping are installed, but these components are not necessary in a new method. In this study two kinds of ice storage systems are experimentally investigated to study the thermal characteristics of ice storage tanks.

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스크류 캡슐형 밀폐식 빙축열시스템의 성능시험에 관한 연구 (Study on the Performance Testing of the Closed Ice Thermal Energy Storage System using Screw Capsules)

  • 김경환
    • 한국태양에너지학회 논문집
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    • 제26권4호
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    • pp.39-45
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    • 2006
  • The decrease in the summer peak electric load in our country is very important. The government has arranged and implemented a lot of support policies and statutes to decrease the peak electric load. And the ice thermal energy storage system is known as one of the alternatives. The purpose of this paper is to evaluate the efficiency and thermal characteristics of the closed ice thermal energy storage system using screw capsules. The measured thermal energy storage density is about 18.4 USRT-h/m3 (=232.9 MJ/m3), which is higher than 13.0 USRT-h/m3 (=164.6 MJ/m3), a low criterion of normal performance. And The efficiency of the discharging process and the total energy utilization is 96.2% and 2028.4 kcal/kWh respectively.

하베스트형 빙축열시스템의 축열조 특성 (Characteristics of Storage Tank on Harvest Type Ice Storage System)

  • 최인수;이호생;문춘근;김재돌;윤정인
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집B
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    • pp.210-215
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    • 2000
  • A fundamental study on the under water harvest-type ice storage system and its temperature characteristics in ice storage system was performed experimentally. The experiments were conducted by changing the inlet refrigerant temperature of an evaporator to analyzing the thermal fluid motion inside the ice storage tank. From the experimental results, the cold storage characteristics were investigated by measuring the axial and radial temperature variations inside the ice storage tank with respect to the inlet and outlet refrigerant temperatures of an evaporator. In case of the under water harvest-type ice storage system, thermal fluid motion inside the ice storage tank was shown differently in comparison with that of other ice storage systems. During the cooling storage process, there was no supercooling phenomenon in the ice storage tank. These results show the characteristic of this system and the possibility of application to other fields.

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봉과 링 조합형 아이스캡슐을 적용한 축열시스템의 열전달 해석 (Heat Transfer Analysis of a Thermal Storage System using the Ice Capsule of Bar and Ring Module)

  • 김명수;최형권;변성광
    • Journal of Advanced Marine Engineering and Technology
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    • 제32권2호
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    • pp.268-275
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    • 2008
  • The shape and array of ice capsules are very important factors in ice thermal storage system because the heat transfer rate of the system strongly depends upon them. In this paper, a new type of ice capsule composed of bar and ring module is proposed to increase the efficiency of the ice thermal storage system. To investigate the heat transfer rate of the proposed ice capsule, numerical analysis of the incompressible Navier-Stokes equations is performed to compare the proposed bar and ring system with the conventional ice capsules. It is shown that the ice capsule composed of bar and ring has a higher heat transfer rate and a low outlet temperature than the conventional ice capsules for various packing ratios and entrance velocities. Furthermore, it is found that the optimal entrance velocity exists between 0.005 m/s and 0.007 m/s from the present numerical analysis.

수중 빙제조형 빙축열시스템의 성능특성 특성 (Experimental Study on the Performance Characteristic in Underwater Harvest-Type Ice Storage System)

  • 장용식;이호생;최인수;김재돌;김은필;윤정인
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.298-303
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    • 2001
  • A fundamental study on the under water harvest-type ice storage system and its temperature characteristics in ice storage system was performed experimentally. The experiments were conducted by changing the inlet refrigerant temperature of an evaporator to analyzing the thermal fluid motion inside the ice storage tank. From the experimental results, the cold storage characteristics were investigated by measuring the axial and radial temperature variations inside the ice storage tank with respect to the inlet and outlet refrigerant temperatures of an evaporator. In case of the under water harvest-type ice storage system, thermal fluid. motion inside the ice storage tank was shown differently in comparison with that of other ice storage systems. During the cooling storage process, there was no supercooling phenomenon in the ice storage tank. These results show the characteristic of this system and the possibility of application to other fields.

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계면활성제 농도가 빙결정의 입자크기에 미치는 영향 (Growth of Ice Crystal with Concentration of Surfactant in Water Solution)

  • 박기원;;오후류
    • Journal of Advanced Marine Engineering and Technology
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    • 제26권2호
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    • pp.240-247
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    • 2002
  • Recently, a thermal energy storage system has been developed actively fur the purpose of saving energy and reducing the peak electrical demand. Especially, ice slurry is a promising working fluid for low temperature energy storage systems. A flow of ice crystals has a large cooling capacity as a result of the involvement of latent heat. However, there are still problems related to the recrystallization of ice crystals for realizing long term storage and long distance transportation. To find improvements fur this, a method for the creation of ice crystals resistant to recrystallization has been proposed and researched by the use of an antifreeze protein (AFP) solution etc. In the present study, it has been investigated the growth of ice crystal in several kinds of water solution added non-ionic surfactant. The results shows that size of ice crystal was smaller with increasing in added surfactant. And ice crystal was not increased with added surfactant.