• 한국자동차공학회논문집
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• 제22권6호
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• pp.89-95
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• 2014

This study presented the benefit of the pre-ventilation using solar sunroof with integrated photovoltaic. Recent year, auto-makers make an effort to enhance the fuel efficiency and moreover to clean the cabin passenger's health. Solar energy, one of the alternative energies, adapted in automotive air handling system, in order to pre-ventilation when vehicle parked under the sun in summer. The power generated by a prototype solar sunroof has been used to run blower in a air handing system. And the solar sunroof was installed in a vehicle, and evaluated to find out benefit of the pre-ventilation. The effect of reducing the cabin temperature about $3^{\circ}C{\sim}10^{\circ}C$ with 20 ~ 40W power generator from solar sunroof were obtained in the pre-ventilation test. This reduced thermal load can lead to the reduction of air-conditioning operation time than that of current car. Moreover, fuel economy may increase as a results of the short use of the air-conditioning time. Additionally, Total Volatile Organic Compounds in the cabin is reduced maximum 80% than that of the current vehicle.

• International Journal of Air-Conditioning and Refrigeration
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• 제17권3호
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• pp.94-99
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• 2009

In the Korean subway station, three types of pre-filters, which include auto filter, electrostatic precipitator (ESP) and auto cleaning demister, are widely used. However, these devices have some problems such as the difficulty of maintenance and high operating cost. In this study, axial-flow cyclone separator was employed as a pre-filter inside a heating, ventilation, and air conditioning (HVAC) system. 3-dimensional computational fluid dynamics (CFD) analysis was performed on a single unit axial-flow cyclone and coupled unit axial-flow cyclone. Calculated and measured pressure drop of the designed axial-flow cyclone were found be comparable to other types of pre-filters and the observed cut-off diameter was less than 10 micron. Considering lower operating and maintenance cost, axial-flow cyclone was proved to be a better solution as a pre-filter.

• 대한설비공학회지:설비저널
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• 제30권2호
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• pp.25-32
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• 2001

각종 설비 조립화 공법에 대하여 소개하고 특히 초고층건물에서의 P.F.P(pre fabricated piping)공법의 현장적용사례를 소개하고자 한다.

• 설비공학논문집
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• 제26권10호
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• pp.467-473
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• 2014

Since the operating conditions of HVAC systems are different from those for which they are designed, on-going commissioning is required to optimize the energy consumed and the environment in the building. This study presents a methodology to analyze operational data and its applications. A predicted operation model is to be produced through a statistical data analysis using multiple regressions in SPSS. In this model, the dependent variable is the pre-cooling time, and the independent variables include the power output of the supply air inverter during pre-cooling, the supply air set temperature during pre-cooling, the indoor temperature-indoor set temperature just before pre-cooling, supply heat capacity, and the lowest outdoor air temperature during non-cooling/non-heating hours. The correlation coefficient R2 of the multiple regression model between the pre-cooling hour and the internal/external factors is of 0.612, and this could be used to provide information related to energy conservation and operating guidance.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.561-564
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• 2009

This study is to examine the possibility of pre-cooling at platform. Through measurement of the thermal environment of Bujeon Subway platforms, review the potential use of ground-water and night purge. The results of this research can improve the thermal environment pre-cooling of the design.

• 원예과학기술지
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• 제34권1호
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• pp.94-101
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• 2016

본 연구에서는 수확 후 예건처리를 통해 '한아름' 배 과실의 상온유통 중 품질 유지를 위한 수확관리 기술을 정립하기 위해 실시하였다. 과실은 만개 후 103일과 110일에 각각 수확하여 세 그룹의 처리 온도(21, 25, $29^{\circ}C$)에서 4일간 예건처리를 실시하였다. 과실의 감모율은 수확시기에 관계없이 예건온도가 낮을수록 낮은 경향을 나타내었다. 과실의 경도는 상온 유통기간이 증가함에 따라 모든 처리에서 경도가 감소하는 경향을 보였고 두 수확시기 모두 $21^{\circ}C$ 처리구가 경도유지에 가장 효과적인 것으로 나타났다. 또한 $21^{\circ}C$에서 예건한 경우, 상온유통 중 외관 품질이 높게 유지되었고 분질장해 등 생리장해의 발생은 낮게 조사되었다. 상온유통 중 에틸렌 발생량은 조기수확과 및 적숙과 모두 비슷한 수준을 보였고 두 수확시기 모두 예건온도가 $21^{\circ}C$인 경우가 25 및 $29^{\circ}C$에 비해 에틸렌 발생량이 적은 것으로 나타났다. 과실의 호흡량은 예건처리 기간 중에는 온도가 높을수록 호흡률이 높아 $29^{\circ}C$ 처리는 $21^{\circ}C$ 처리에 비해 호흡률이 2배 이상 높았고 조기수확과에 비해 적숙과가 호흡률이 높은 것으로 나타났는데 상온 유통기간 중에는 큰 차이를 보이지 않았다. 이상의 결과를 종합하면 한여름에 수확되는 조생종 '한아름' 배에 있어 수확 후 $21^{\circ}C$ 예건처리는 상온유통 중 과실의 품질 유지를 위한 바람직한 수확 후 처리방법의 하나로 추천할 수 있을 것으로 판단되었다.

• 설비공학논문집
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• 제16권11호
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• pp.1060-1067
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• 2004

To apply an analysis method of life cycle cost when assessing economics of equipment system, we should basically set up preconditions such as useful life, price escalation rate, interest rate, etc. as well as consider a calculation algorism of source energy and heat source system, which is a complex process for life cycle costing. For this reason, equipment designers tend to plan heat source systems, without a thorough investigation on economics of alternative systems at the pre-design phase. In this process, architectural designers should adopt a proper heat source system, which is one of the most important factors for planning an appropriate architectural design, through a discussion with equipment designers in a short time. In order to offer an evaluation method for equipment designers to analyze economics of an alternative heat source system easily at the pre-design phase, this research would define the simplified economics, evaluation method through analysis of existing papers for economics evaluation, and examine validity through comparison of simplified method values ($LCC_{EC}$) and life cycle costing values ($LCC_{15}$) for six alternative heat source systems.

• Journal of Advanced Marine Engineering and Technology
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• 제24권1호
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• pp.41-48
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• 2000

The characteristics of a combined cycle for the production of fresh water and air-conditioning was analyzed. The combined cycle consisted of an open water cycle and a $CO_2$ refrigeration cycle interlinked in the pre-heater of the water cycle, which is the condenser of the refrigeration cycle. The oprating conditions and criteria for the fresh water production and air-conditioning was described and their effects on the total system were evaluated. The results indicated an increase of desalinated water with the increase of hot water temperature, which resulted in the decrease of cooling capacity of the refrigeration system in this study. However, the energy saving correspond to the pre-heating of the water cycle by the condensing of the refrigeration system shows the avilable advantage of the proposed cycle as compared to other single purpose plants for desalination.

• 설비공학논문집
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• 제10권6호
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• pp.795-802
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• 1998

For measuring the thermal diffusivity by laser flash method, raw data have to be calibrated using temperature data. We have developed in-process calibration method and polynomial calibration in which thermal diffusivity can be calibrated during measuring, This method is different from existing temperature pre-process calibration method and exponential calibration having various source of error. Using this new calibration method, measurement accuracy was improved about 1∼2% compare to the value by the existing method. We also studied more accurate fitting curve as in Figure 4 was shown the result of measuring output characteristics of IR radiometer with temperature. As illustrated in data, in-process calibration method and polynomial calibration equation is proper than pre-process calibration method and exponential calibration.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.269.1-269.1
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• 2002

MPP$\^$＋/ is known to be a neurotoxic substance that induces the degeneration of dopaminergic neurons and Parkinson-like syndrome. Incubation with MPP$\^$＋/ induced the expression of heme oxygenase-l (HO-1) in PC-12 cells and HO-1 revealed a protective effect against MPP$\^$＋/ -induced cytotoxicity. In this study. we tested the effect of pre-conditioning on the MPP$\^$＋/-induced cytotoxicity. The PC-12 cells were incubated with MPP$\^$＋/ for 3 hrs. and then after 12 hrs the cells were exposed to several concentration of MPP$\^$＋/. (omitted)