• 제목/요약/키워드: refrigeration storage

검색결과 357건 처리시간 0.025초

국내 냉장냉동 창고 현황 조사 (Investigation of Domestic Refrigeration and Freezing Warehouses)

  • 선일석
    • 유통과학연구
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    • 제6권2호
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    • pp.5-19
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    • 2008
  • 본 연구에서는 냉장, 냉동 창고의 기초 자료가 부족하여, 불완전하기 때문에 이러한 기초자료를 제공하기 위하여 냉장 냉동 창고의 일반현황을 제시하는 데 목적이 있다. 조사내용은 냉장 냉동 창고의 일반적인 현황으로는 매출액, 자본금(출자금), 창고종류별 보유현황, 보관면적, 냉장냉동 시설용량 등과 설비현황으로는 랙의 유무, 건축물 구조 및 층고, 모유설비현황 등을 조사하였다. 조사결과에 따르면 지역별 분포는 수도권과 부산지역이 전체의 86.7%로 대부분을 차지하였으며 이들 지역이 평균보관면적 또한 큰 것으로 나타났다. 또한 전체 업체의 80%이상이 보세장치장을 보유하고 있는 것으로 조사되었으며, 냉장 냉동 창고의 면적 및 용량은 고른 분포를 보였다. 건축물 구조는 철근 콘크리트 구조가 대부분이었으며 설비의 경우 랙 설치 업체가 전체의 25%로 나타나 설치율이 낮았으며 랙의 설치여부와 자본금 및 매출액 규모와는 통계적 유의성을 보이지 않았다. 또한 보유설비는 화물용 승강기, 정보시스템, 도크 순이었으며 하역장비로는 지게차가 평균 9.1대, 리치스태커는 평균 2.2대 인 것으로 조사되었다. 본 조사가 국내 냉장 냉동 산업의 실태파악과 예측, 발전에 기초가 될 것으로 생각하며 향후 좀 더 세밀한 연구가 추가적으로 진행되어야 할 것이다.

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해수 열원 히트펌프와 태양광 발전을 이용한 순환여과식 양식장의 에너지 절감 효과 분석 (Analysis of energy-saving effects of recirculation aquaculture system using seawater source heat pumps and solar power generation)

  • 류종혁;정현석;정석권
    • 수산해양기술연구
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    • 제60권2호
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    • pp.194-206
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    • 2024
  • This study focuses on analyzing the energy-saving effects of the recirculation aquaculture system using seawater source heat pumps and solar power generation. Based on the thermal load analysis conducted using the transient system simulation tool, the annual energy consumption of the recirculation aquaculture system was analyzed and the energy-saving effects of utilizing the photovoltaic system was evaluated. When analyzing the heat load, the sea areas where the fish farms are located, the type of breeding tank, and the circulation rate of breeding water were taken into consideration. In addition, a method for determining the appropriate capacity for each operation time was examined when applying the energy storage system instead of the existing diesel generator as an emergency power, which is required to maintain the water temperature of breeding water during power outage. The results suggest that, among the four seas considered, Jeju should be estimated to achieve the highest energy-saving performance using the solar power generation, with approximately 45% energy savings.

냉동냉장창고 외피구조 유형별 경제성 평가 (Economical Efficiency Evaluation of the Cold Storage Warehouse with Various Envelope Structures)

  • 송승영;석호태;황혜주;안홍섭
    • 설비공학논문집
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    • 제13권11호
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    • pp.1156-1164
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    • 2001
  • This study aims to suggest envelope structure which can improve the insulation performance of cold storage warehouse with cost effectiveness. Envelope structures are classified and economical efficiency of each type is evaluated to the model warehouse. As results, type 3 (PC wall) and 4(sandwich panel wall) have benefits to the middle/large (lifetime of 25 years) and small (lifetime of 12∼13 years) warehouse, respectively.

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전축열방식 빙축열 시스템의 최적제어 알고리즘 (Optimal Control Algorithms for the Full Storage Ice Cooling System)

  • 한도영;이준호
    • 설비공학논문집
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    • 제14권4호
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    • pp.350-357
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    • 2002
  • Optimal control algorithms for the full storage ice cooling system were developed by using a dynamic simulation program. Control algorithms for the storage charging mode were developed for the chiller outlet temperature setpoint control and the chiller capacity control. Control algorithms for the storage discharging mode were developed for the proper mode selection, the storage-only mode control, and the storage-priority chiller-shared mode control. Two different cases of the expected outdoor air temperature profile and the expected cooling load profile were used to analyze the effectiveness of these algorithms. Simulation results show the energy savings and the satisfactory controls of the ice storage system. Therefore, control algorithms developed for this study may effectively be used for the improved control of the ice storage cooling system.

태양열을 이용하는 잠열축열 시스템에 관한 연구(제1보 PCM 계산 모델의 개발) (A Study on latent heat storage system with Solar heat(Part 1. Development of PCM modeling))

  • 구학근;김종열
    • 한국태양에너지학회 논문집
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    • 제21권4호
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    • pp.47-54
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    • 2001
  • This study has been conducted to verify the possibility of adaptation of a latent storage type air-conditioning system, shifting the peak load of electronic power to a building. In this paper, an energy equation to evaluate performance of PEM(phase change material) has been suggested and solved, after discretization. As a result, it is confirmed that the results from the energy equation are correspond with those from present studies to analysis of one-dimensional solidification and to analysis of two-dimensional solidification.

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슬래브축열의 최적축열시간 산정 : 구배법 알고리즘에 의한 해석 (An Analysis of the Optimal Thermal Storage Time of Air-Conditioning System with Slab Thermal Storage : An Analysis by the Gradient Method Algorithm)

  • 정재훈
    • 설비공학논문집
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    • 제20권10호
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    • pp.702-709
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    • 2008
  • In this paper, the optimal thermal storage time of an air-conditioning system with slab thermal storage in office building was analyzed on the basis of the gradient method algorithm. The sum of room temperature deviation and heat extraction rate was set to the criterion function. It was calculated that four hours is the optimal thermal storage time under the standard evaluation criterion. Furthermore, some case studies were executed by controlling ratio of weight functions of room temperature deviation and heat extraction rate in criterion function. It is possible to design many kinds of optimal operation of an air-conditioning system with slab thermal storage by controlling ratio of the weight functions in criterion function.

드럼형 증발기를 적용한 2단 압축 해수 제빙시스템의 성능 특성 (Performance Characteristics of Two-stage Compression Seawater Ice Machine Applied Drum type Evaporator)

  • 손창효;윤정인;전민주;이현경;허성관
    • 동력기계공학회지
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    • 제21권2호
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    • pp.77-82
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    • 2017
  • In the fishing boat, freshwater ice is loaded on the fishroom in advance and it is used for storage of fishes. However, it causes degradation of catches' freshness. Therefore, seawater ice machine on board is necessary for the fishing industry. In this study, seawater ice machine with drum type evaporator was manufactured, and the system was tested under various operating conditions having an influence on the COP and amount of ice produced. The main results are as follow : The COP of the system gets larger when the evaporation temperature and rotation speed of the drum in the evaporator increases. The most effective refrigerant is R22 and the value of the COP was 1.43 times higher than that of R404A. The amount of produced ice increases with respect to increment of the evaporation temperature, while that decreases with respect to increment of the evaporator drum rotation speed.

Magnetic refrigerator for hydrogen liquefaction

  • Numazawa, T.;Kamiya, K.;Utaki, T.;Matsumoto, K.
    • 한국초전도ㆍ저온공학회논문지
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    • 제15권2호
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    • pp.1-8
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    • 2013
  • This paper reviews the development status of magnetic refrigeration system for hydrogen liquefaction. There is no doubt that hydrogen is one of most important energy sources in the near future. In particular, liquid hydrogen can be utilized for infrastructure construction consisting of storage and transportation. Liquid hydrogen is in cryogenic temperatures and therefore high efficient liquefaction method must be studied. Magnetic refrigeration which uses the magneto-caloric effect has potential to realize not only the higher liquefaction efficiency > 50 %, but also to be environmentally friendly and cost effective. Our hydrogen magnetic refrigeration system consists of Carnot cycle for liquefaction stage and AMR (active magnetic regenerator) cycle for precooling stages. For the Carnot cycle, we develop the high efficient system > 80 % liquefaction efficiency by using the heat pipe. For the AMR cycle, we studied two kinds of displacer systems, which transferred the working fluid. We confirmed the AMR effect with the cooling temperature span of 12 K for 1.8 T of the magnetic field and 6 second of the cycle. By using the simulation, we estimate the total efficiency of the hydrogen liquefaction plant for 10 kg/day. A FOM of 0.47 is obtained in the magnetic refrigeration system operation temperature between 20 K and 77 K including LN2 work input.

조리, 재가열 방법 및 저장 조건이 너비아니 품질 특성에 미치는 영향 (Effect of Cooking, Reheating Methods and Storage Conditions on the Quality Characteristics of ′Nuhbiani′)

  • 김정원;김희섭
    • 한국식품조리과학회지
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    • 제11권5호
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    • pp.494-502
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    • 1995
  • The study was conducted to evaluate the characteristics of Nuhbiani qualities with the different cooking, reheating methods and storage conditions. Cooking and reheating methods were used with pan, microwave and their combinations. Precooked samples were stored for 0, 1, 4, 7, 15 days in the refrigerator and for 15, 30 days in the freezer. TBA value, shear value by rheometer and sensory attributes in rancidity, hardness, juiciness and overall acceptability were measured. There was no significant difference between cooking, reheating methods in TBA values. Lower values in TBA were noted in the Nuhbiani of frozen storage as compared with that of refrigerated storage. There is a tendency that TBA values were increased as the storage time extended during the refrigeration. Shear values were more increased by microwave cooking and microwave reheating than other methods showing harder texture. Results from sensory evaluation of rancidity, hardness, juiciness and overall acceptability show that there were no significant differences between storage methods, among storage periods and cooking, reheating methods.

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에너지 다소비형 건물 축냉 시스템의 경제성에 관한 연구 (The Study of Economical Efficiency for the Ice Storage System of more Energy Consumption Building)

  • 이제묘
    • 설비공학논문집
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    • 제24권10호
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    • pp.733-738
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    • 2012
  • It is important issue to reduce the electric energy to save the operating cost of HVAC system. Even if electrical energy is the clean energy, it is difficult and takes high cost for storage of electricity. These cause the high peak load of electric energy for HVAC in summer season. In korea, government impose the electric charge with several grade for the purpose of cut-off the peak load of electricity. Government has a policy to support to design and install the heat/ice storage system using midnight electricity. In this study, analysis of cooling load and operating characteristics for ice storage system are performed. And, also economical efficiency is compared between ordinary charge system of electricity and midnight rate charge of electricity. The systematic and economical supports are needed for expansion of usage of energy saving equipments.