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직접공급방식 지역난방시스템의 적정공급온도 및 단위부하 분석
정용호(Jung Yong-Ho) 한국건축친환경설비학회 2010 한국건축친환경설비학회 논문집 Vol.4 No.3
District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. The current indirect connection in Korea is applied to the case of big scale, it brings about heat loss in its network. Moreover, high-priced heat exchanger facilities are required. Direct connection has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. Furthermore, renewable energy such as solar heat, geo-thermal heat and heat pump and others can be applied to the direct connection in district heating as supply temperature is comparatively low. However, direct connection is not economical for heavy load and it is difficult to keep the temperature of supply water low. When direct connection is applied, it is the most important to supply stable heat source to consumers. In the previous study, appropriate supply pressure for direct connection are suggested. Therefore, the objective of this study is to offer the fundamental data for applying the direct connection in district heating to Korea by investigating the unit heating load and optimal temperature based on supply condition and stability for consumers from the previous studies. The results of this study are follows; 1) Heating loads(including domestic hot water supply) for each consumers in conventional direct connection system were proved to be excessive comparing to simulated results. 2) The optimal range of supply water temperature was 60~90℃ in case of supply for domestic hot water to each households.
냉방부하 절감을 위한 증발냉각 환기시스템의 적용성 평가
정용호(Jung Yong-Ho) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.3
IAQ(Indoor Air Quality) problems has occurred due to the lack of ventilation caused by high airtight window performance and building materials of high performance insulation. In order to improve this indoor air environment, the installation of forced ventilation system is necessary to apartment houses in Korea. But energy consumption is increased because of the increase of room ventilation rate. So it is necessary to develop the high efficient ventilation system for energy saving in buildings. In this study, the performance of ventilation system using indirect evaporation cooling method was evaluated. As the results, the mean temperature and enthalpy of supply air to indoor space was 4.2℃. 3.3㎉/㎏ lower than those of outdoor air. Therefore indirect evaporation cooling system is expected to contribute the energy saving for ventilation in buildings under the Koran weather condition.
정용호(Yong-Ho Jung),박성룡(Seong-Ryong Park) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.1
The summer climate is very hot and humid in Korea. The humidity is an important factor in determining thermal comfort. Recently, the research for dehumidification device development has been attempted to save energy that is required for the operation of the current dehumidifiers on the market. Existing dehumidification systems have disadvantages such as wasting energy to drive a compressor. Meanwhile, dehumidification systems with membranes can dehumidify humid air without increasing the dry bulb temperature so it doesn’t have to consume cooling energy. In this paper, the cooling energy savings was studied when a dehumidification system was applied in a model building instead of a chiller. The sensible heat load was almost the same result, but the latent heat load was decreased by 38.9% and the total heat load was decreased by 8.5%. As a result, electric energy used to drive the compressor in a chiller was saved by applying a membrane airconditioning system instead.
정용호(Jung Yong-Ho),손장열(Sohn Jang-Yeul) 한국건축친환경설비학회 2009 한국건축친환경설비학회 논문집 Vol.3 No.3
District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. The current indirect connection in Korea is applied to the case of big scale, it brings about heat loss in its network. Moreover, high-priced heat exchanger facilities are required. Direct connection has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. However, direct connection is not economical for heavy load and it is difficult to keep the temperature of supply water low. When direct connection is applied, it is the most important to supply stable heat source to consumers. Therefore, the objective of this study is to offer the fundamental data for applying the direct connection in district heating to Korea by investigating the pressure variation based on supply condition and stability for consumers from the previous studies. The results of this study are follows; I) In case the supply pressure is 6bar, direct connection is feasible for 5-floor-apartments and detached houses without booster pump by the analysis of pressure variation at consumer facilities. 2) 5~6bar was required in 10-floor-apartments for direct connection and in case of 15-floor apartments, 6bar was necessary to prevent minus pressure without booster pump. 3) In case of 20-floor-apartments, supply pressure of 6bar could not be applied since minus pressure occurred in the top of the apartments.
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.
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.