This study was carried out in a cold storage chamber with a floor space of roughly 3.3 square meters (1 pyeong). The findings revealed that the hybrid cooling system consumed a comparable amount of electricity to that of the conventional vapor compression system. This similarity in power usage can be attributed to the hybrid system’s operational strategy: thermoelectric modules were selectively activated during periods of frost accumulation, effectively minimizing the energy typically used for electric defrosting in vapor compression units. To advance the commercialization of this hybrid system in cold storage applications, several technical improvements must be considered in addition to cost optimization. First, the design should address the bulky nature of the heat exchanger setup. At present, the vapor compression and thermoelectric modules are housed in separate outdoor units; a more efficient approach would involve integrating them into a single, space-saving unit. Second, incorporating a water mist spray mechanism for the outdoor heat exchanger coil could enhance heat dissipation. This method, which leverages latent heat exchange, has demonstrated strong performance in other applications and merits further investigation for use in the proposed system.

This experiment was conducted in a 1-pyeong cold room. Looking at the experimental results, it can be seen that the power consumption is twice as high when the thermoelectric module cooler is used compared to when the steam compression type cooler is operated. As is commonly known, steam compression coolers have a COP of about 3.0 in commercial coolers such as air conditioning systems and refrigerators, and the COP of coolers using thermoelectric modules is about 1.0, showing a performance difference of about 3 times. The reason for this difference is that the heat conduction fin material and shape were optimized, and the defrosting power consumption was relatively small in the thermoelectric method. The performance of thermoelectric devices shows that although there are still many improvements to be made over existing methods, they can exhibit sufficiently different advantages depending on the system.

농산물 저온저장고 내부의 온도분포 균일화를 수치해석적으로 분석하기 위해 3차원 CFD 시뮬레이션을 수행하였다. CFD 시뮬레이션 모델은 속도벡터 및 온도분포 측정치와 비교를 통해 검증하였으며, 온도분포 균일화 향상을 위한 적정 팬용량 및 적재방법을 설정하기 위해 몇 가지 팬풍속 및 저장물과 벽체간의 거리 등에 대해 기류패턴과 온도 분포를 분석하였다. CFD 시뮬레이션의 검증에서 속도벡터 분포는 PIV시스템에 의한 측정치와 비교했을 때 표준 k-모

농산물의 고품질 유지 저온저장 및 저장물 관리의 편리화를 위해서 원거리에서 저장고 환경을 감시할 수 있는 인터넷을 이용한 저온저장고 환경감시 및 경보 시스템을 개발하였으며, 그 내용을 요약하면 다음과 같다. 실용화를 촉진하기 위하여 환경감시 및 경보 시스템의 저온저장고측 컴퓨터를 산업용 제어반인 PLC(Programmable Logic Controller)로 하여 원거리 환경감시 및 경보시스템을 제작하였다. 농가에서 사용하기 쉽게 윈도우용 환경하