• Journal of Mechanical Science and Technology
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• 제19권4호
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• pp.1001-1005
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• 2005

This paper evaluates the performance of ventilation for the removal of indoor pollutants as a function of ventilation rate and the number of occupants in a test room and school classroom. An experimental apparatus consists of a test room, a tracer gas supply system, a gas detector, and a fan for ventilation air supply with a controller. The ventilation performance is evaluated in a step-down method based on ASTM Standard E741-83 using $CO_{2}$ gas as a tracer gas in the test room of 35 $m^{3}.$ For the ventilation air flow rate of 1.0 ACH, a recommended ventilation flow rate of Korea school standard for acceptable indoor air quality in the case of one person, CO_{2}$ gas concentration decreases up to $55{\%}$ within 50 minutes without occupancy and increases up to $75{\%}$ in the case of one occupant. Also indoor air quality at the school classroom is investigated experimentally.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.938-943
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• 2006

The primary purpose of a computer room of data center and associated infrastructure is to support the operation of critical IT equipment. Traditionally, most owners of large critical data centers have been more than willing to accept a reasonable amount of computer room worker discomfort if necessary to support critical IT systems. All electrical equipment produces heat, which must be removed to prevent the equipment temperature from rising to an unacceptable level. Most information technology equipment and other equipment found in a data center or network room is air-cooled. Sizing a cooling system requires an understanding of the amount of heat produced by the equipment contained in the enclosed space, along with the heat produced by the other heat sources typically encountered.

• 동력기계공학회지
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• 제10권4호
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• pp.43-49
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• 2006

Nowadays, the thermal environments of classrooms are usually adjusted by the ceiling type air-conditioning system with a temperature sensor installed on inlet of an air-conditioner. However, it is not clear that the conventional temperature sensor position is proper to satisfy both thermal comport and energy saving in summer especially. Therefore, this study is aimed at finding out the best position of the temperature sensor on the purpose of the comfort thermal environment and energy saving. The different 5 positions for the temperature sensor are supposed in this paper to analyze thermal environment by CFD. From the analysis through the CFD simulations, the best position of the temperature sensor satisfying for both comfort thermal environment and energy saving is obtained.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2002년도 추계학술대회 논문집
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• pp.97-102
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• 2002

Resident's agreeableness anger elevation request by improvement of life environment with economy development is increasing recently. However, research about air current estimation in dwelling environment that make use of air conditioner summer and cooling room is lacking going yet much. We are going to prefer most air current pattern(speed 3 steps of swing) that offer in PAC after figure processing because user's life hysteresis and present air current pattern that is supposed and offer more agreeable environment to room resident.

• 대한기계학회논문집 C: 기술과 교육
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• 제3권2호
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• pp.117-124
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• 2015

최근 생활수준의 향상으로 인해 가정용 에어컨의 보급률이 꾸준히 증가함에 따라 품질에 대한 소비자의 눈높이 또한 점점 높아지고 있다. 과거에 소비자의 요구는 제품의 효율성에 집중되었지만 점차 저진동/저소음에 대한 부분으로 확장되고 있다. 에어컨의 압축기는 제품의 효율을 결정하는 주요한 부분이면서 동시에 진동/소음의 주된 원인을 제공하고 있다. 압축기에서 발생한 진동/소음은 압축기 케이스와 배관을 통해 주위 구조물로 전달되고 이들은 다시 구조기인 소음이나 2 차적인 진동을 유발하게 된다. 본 연구에서는 RecurDyn 을 이용해 압축기의 진동/소음에 영향을 미치는 모터의 가진력이 고려된 MFBD(Multi Flexible Body Dynamics) 해석 모델을 개발하였다. 개발된 모델을 이용하여 압축기의 진동/소음 특성을 조사하고 압축기에서 발생하는 진동을 계산하여 실험 결과와 비교하였다.

• 사물인터넷융복합논문지
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• 제6권3호
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• pp.7-13
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• 2020

본 논문에서는 IoT를 기반으로 서버 룸의 환경을 실시간으로 모니터링하며 제어하는 시스템을 제안한다. 최근 정보화 사회가 극대화되면서 컴퓨터 시스템이 다운되었을 때 그 피해가 크다. 특히, 서버 룸의 화재와 같은 피해는 데이터의 손실로 이어지고 데이터 복구가 불가능하게 된다. 이와 같은 피해를 줄이기 위해서 IoT 시스템을 활용하여 실시간 모니터링할 수 있는 노드를 제안하였다. 또한, 노드의 정보를 취합하고 모니터링할 수 있는 코디네이터 노드를 제안하였다. 제안하는 시스템이 동작하는지 확인하기 위해 노드 모니터링 및 에어컨디셔너를 제어할 수 있는 소프트웨어를 개발하였다. 실험 결과 제안하는 시스템이 화재를 감지하고 상황에 따라 에어 컨디셔너를 제어하는 것을 확인하였다.

• International Journal of Air-Conditioning and Refrigeration
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• 제8권2호
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• pp.89-100
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• 2000

Present study explains some experimental results on the aerodynamic noise of the cross-flow fan usually installed in the indoor unit of the room air-conditioners and provides a simple reduction method of radiating sound to decrease the total noise level. The spectra of the noise of the cross-flow fan were analyzed by the spectral decomposition method to characterize the generated sound. The unsteady fluctuating flow field was also measured using the I-type hot-wire probe. Comparing the spectral characteristics of the sound and the flow velocity, a useful noise reduction method was proposed, which bounds the region with a fence where the flow fluctuations were noticeably changed in the same fashion as the source spectral distribution functions vary. To validate the proposed method for reducing noise generated by the cross-flow fan, the sound pressure levels of the cross-flow fan system were compared with and without the bounding fence for various flow rates.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 동계학술발표대회 논문집
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• pp.24-24
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• 2006

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 하계학술발표대회
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• pp.140-140
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• 2005

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 하계학술발표대회
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• pp.22-22
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• 2005