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정용호(Jung, Yong-Ho) 한국건축친환경설비학회 2012 한국건축친환경설비학회 논문집 Vol.6 No.1
Energy Cost has been rapidly increased with the internal heat gain of data center to keep the temperature condition. But the cooling units for server systems are fully operated to satisfy the indoor temperature condition, it results in the excessive energy consumption. In this study, various cooling systems were studied for data center and cold aisle containment system was proved to be the best solution for server cooling system. Because it protects the cooling zone from the hot aisle space. Effective cooling and prohibition of recirculation air from hot aisle was possible by the cold aisle containment system.
태양집열창방식 자연환기시스템에 의한 실내 환기효율 예측
정용호(Jung Yong-Ho) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.1
This study estimates ventilation efficiency for apartment using solar radiation in order to improve energy savings and indoor air environment. Field measurements were performed in a full-scale mock-up model. A solar collection device and ordinary device for natural ventilation were installed in each room. Temperature and airflow velocity were monitored in each five minutes. Solar radiation and daylight illuminance were also measured. The concentration of indoor air for two conditions was monitored using a multi-gas monitor and tracer gas. The air change rates per hour(ACH) under the conditions were computed based on the concentrations. The air change rates per hour (ACH) using solar radiation exceeded the required air change rate per hour was linearly proportional to the solar radiation. The ventilation device using solar radiation contributed to provide better thermal environment with energy savings. From the result of ventilation efficiency prediction for the 85㎡ area of practical residential building by CFD simulation. it was found that average age of air was 90.3min, nominal time constant was 82.9min. So total average ventilation efficiency was 0.918, this value means about 92% of indoor air could be mixed.
모듈러 데이터센터 냉각시스템의 취출온도 조건에 의한 연간에너지 소비량 예측
정용호(Yong-Ho Jung) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.1
The modular data center is greatly influenced by operating conditions because its internal size is smaller than the existing hyperscale data center. The recent emergence of servers that can adapt well to indoor temperature rise requires a review of existing temperature conditions. In this study, the potential for temperature condition mitigation and annual energy performance were analyzed for recent installations of improved thermal performance servers in container-type distributed modular data centers. According to the analysis, the upper dry bulb temperature of the intake air for maintaining the recommended level, acceptable level A1, and acceptable level A2 was 14℃, 16℃, and 19℃ respectively. The annual energy savings predicted in the analysis was 3.1% and 9.2%, when the intake air temperature of the servers in the modular data center was mitigated to the A1 and A2 levels respectively.
정용호(Yong-Ho Jung),박성룡(Seong-Ryong Park) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.12
The summer climate is very hot and humid in Korea. Humidity is an important factor in determining thermal comfort. Recently, research on dehumidification device development has been attempted to save the energy required for operating the dehumidifier. Existing dehumidification systems have disadvantages such as wasting energy to drive the compressor. Meanwhile, dehumidification systems with membranes can dehumidify humid air without increasing the dry bulb temperature. Therefore. they don’t have to consume cooling energy. In this paper, the installation conditions for a membrane system were analyzed to improve the shape and optimum performance of the system. The results showed that the distance between elements was the critical system design factor, and that a distance of 20 mm was the optimal condition for the pressure drop and flow characteristics of the internal air flow.
정용호(Yong-Ho Jung),안병욱(Byung-Wook Ahn) 한국생활환경학회 2003 한국생활환경학회지 Vol.10 No.1
Air conditioning systems are indispensable in modem buildings. Therefore air conditioning systems play a main role in improving indoor air quality. However, there is not enough information about air duct contamination and any official maintenance standards or guidelines, for air duct maintenance does not exist in Korea. In this study, dust concentration and microorganisms between the upstream and the downstream of air filters and air duct were measured with particle counter and blood agar plates. Before and after duct cleaning out and after 45 days above items were measured at 4 points in each floor of building under actual operating conditions. As for the results, air duct contamination strongly influence on the indoor air quality. So proper maintenance of air duct should be carried out in the building. The aims of this study are proposal for air filter maintenance methods after installation and basic data about air duct maintenance guidelines or standards for operator.