• 제목/요약/키워드: Cold storage refrigerator

검색결과 39건 처리시간 0.024초

강제대류방식 PCM 축냉장고 개발 (The Development of a PCM Cold Storage Refrigerator using Forced Convection Method)

  • 이상렬;류인근;김진홍;전용호
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2005년도 동계학술발표대회 논문집
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    • pp.517-522
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    • 2005
  • A cold storage refrigerator using phase change material(PCM) has been developed and its performance test results are provided here. The inner temperature of the refrigerator is controlled with forced convection driven by a fan using a DC battery. At the first, to freeze all the PCM of the ambient temperature by a built-in refrigerating machine, it took about 8 and 10 hours respectively at the refrigerator and the freezer mode. Then, without external power supply, the inner temperature of the cold storage refrigerator has been maintained at $-18{\pm}1^{\circ}C$ during 14 hours at the freezer mode and maintained at $3{\pm}^{\circ}C$ during 34 hours at the refrigerator mode. Just after the end of its valid usage as a refrigerator or a freezer, it took about 6 hours to refreeze the PCM for its reuse. During the test, the ambient temperature was kept at $30^{\circ}C$.

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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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냉장고 내부의 냉기 유동특성에 관한 3차원 해석(I) (3-Dimensional Calculation on Cold Air Flow Characteristics in a Refrigerator)

  • 오민정;이재헌;오명도
    • 설비공학논문집
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    • 제7권3호
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    • pp.382-395
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    • 1995
  • A numerical study has been performed on flow characteristics in a domestic refrigerator whose size is $540mm{\times}1,530mm{\times}680mm$, considering existence of a fan and evaporator. The flow field has been simulated with the low Reynolds number $k-\bar{\varepsilon}$ turbulent model and SIMPLE algorithm based on the finite volume method. The region of fan which makes driving force for cold air distribution was modeled as a region in which momentum sources are generated uniformly. The concept of the distributed pressure resistance was applied to describe the momentum loss from evaporator. The result showed that the rate of cold air distribution into freezing room and cold storage room was almost 7 : 3.

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냉동기용 지능형 진단시스템의 개발 (Development of Intelligent Diagnostic System for Refrigerator)

  • 임대영;유재영
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2004년도 춘계학술대회 학술발표 논문집 제14권 제1호
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    • pp.25-28
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    • 2004
  • This paper describes an intelligent diagnostic system for the refrigerator which is used for the cold-storage of farm produce. The propose method measures the temperature of the compressor, condenser and evaporator in the refrigerator and uses the measured values to diagnose the system. It is shown through the implementation that the developed system is efficient for the fault observation and diagnose of the refrigerator.

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가정용 냉장고에서 동결저장 중의 가리비의 품질 변화 (Quality Changes of Frozen Scallop[Patinopecten yessonensis(Jay)] Stored in theDomestic Refriogerator)

  • 김상무
    • 한국식품영양과학회지
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    • 제26권3호
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    • pp.450-455
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    • 1997
  • Scallop, Patinopecten yessonensis(Jay), cultivated in the cold east coast of Kwangwon region, Korea, is expected to be producted to about 50,000 tones in 2000 year. Freezing is one of the most effective methods applied for soraging seafoods. But, the domestic refrigerator with an automatic defrost system shows the temperature fluctuation during defrosting, thus might result in the deterioration of the frozen foods. In this study, the domestic refrigerator with an automatic defrost system, temperature fluctuation from -18 to -5$\pm$1$^{\circ}C$ and fluctuation intervals from 16 to 20 hr, was used for storing scallop. pH was decreased rapidly after 3 month storage, while the content of amino nitrogen was increased continuously. The TMA content of open state was increased very rapidly on 3 month storage and then increased slowly, whereas that of vinyl package increased slowly. The VBN content was increased almost constantly with no significant differences between storage methods. The TBA content was increased up to 3 month storage with the higher value in open state than vinyl package in the beginning periods of storage, and then decreased very rapidly. The number of total viable cell was increased continuously during storage with higher number in open state than vinyl package. The estimated shelf-lives of frozen scallop with open state and vinyl package stored at -18$^{\circ}C$ in the domestic refrigerator with an automatic defrost system were 3.55 and 3.78 months, respectively.

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저온창고에서 냉동기 응축폐열을 이용한 제상시스템 성능평가 (Performance Evaluation of a Defrosting System Using the Condensation Heat of a Refrigerator in Cold Storage)

  • 박천완;이동규;임관빈;강채동
    • 설비공학논문집
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    • 제26권2호
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    • pp.72-78
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    • 2014
  • In a cold chain, the refrigerator is also employed for defrosting, by using an electric heater, which consumes 15% of the power for the system operation. In this study, the condensation heat of the refrigerant was suggested as the heat source of defrosting heat, instead of that from an electric defrost heater. The heat for defrosting was stored to a phase change material (PCM, NMP : $52^{\circ}C$) in thermal storage, and was periodically supplied to the evaporator by a circulation loop of brine. As a result, a defrost time by the PCM was obtained that was less than or equal to that by the electric heater. Moreover, power consumption during defrosting was saved by up to 99% of that of the electric heater.

공기분사식 제상장치 개발에 관한 실험적 연구 (Experimental Study for Development of Air Eject Defrost Equipment)

  • 한인근;김창영;김재돌;윤정인
    • 대한기계학회논문집B
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    • 제25권3호
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    • pp.277-284
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    • 2001
  • One of the problems in a refrigerator operation is the frost formation on a cold surface of the evaporator. The frost layer is formed by the sublimation of water vapor when the surface temperature is below the freezing point. This frost layer is usually porous and formed on the cold surface of the evaporator. The frost layer on the surface of a evaporator will make side effect such as thermal resistance. However, these important factors have not been used in determining the defrosting period. Therefore, the proper defrosting operation period based on the new defrosting method is very important, and make a comparison between conventional method like electric defrost and new method in compression work, evaporation pressure, evaporation temperature.

냉동기용 지능형 진단시스템의 설계 (Design of Intelligent Diagnostic System for Refrigerator)

  • 임대영;유영재
    • 한국지능시스템학회논문지
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    • 제14권3호
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    • pp.267-272
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    • 2004
  • 본 논문에서는 농산물 저온저장시설의 냉동기용 지능형 진단 시스템을 제안한다. 제안하는 방법은 냉동기에 고장이 발생하면 냉동기 주요배관의 온도가 변화하는 성질을 이용하였다. 주요배관의 온도와 고장부위의 관계를 신경회로망을 이용하여 학습함으로써 고장상태를 추론할 수 있다. 제안된 방법을 구현하기 위하여 온도계측시스템 및 진단프로그램을 개발하였다. 개발된 시스템을 현장에 적용 실험하여 제안된 방법의 유용성을 검증하였다.

염수 축냉이 김치냉장고의 성능에 미치는 영향 (A Study on the Effects of the Cold Heat Storage with Salt Water on the Performance of a Kimchi Refrigerator)

  • 길복임;최은수
    • 설비공학논문집
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    • 제22권12호
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    • pp.891-896
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    • 2010
  • The objective of the present study is to reveal the effects of a phase-change material on the performance of a Kimchi refrigerator. Two-percent salt water, of which melting temperature was $-1.1^{\circ}C$, was used for the phase-change material. The salt water was packed in silicon cases and inserted between Kimchi container and the copper pipe of the evaporator. The maximum and minimum temperatures of the inner wall of the Kimchi container without salt-water pack were $-0.2^{\circ}C$ and $-8.9^{\circ}C$, which were remarkably improved by using the salt-water packs, resulting $-0.5^{\circ}C$ and$ -1.9^{\circ}C$. This shows a useful application of using phase-change materials for accurate temperature controls.