• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.17 no.5
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• pp.397-403
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• 2005

The thermal comfort of occupants is directly related to several environmental factors such as velocity of air flow, turbulence intensity and temperature distribution of indoor air. The purpose of this study is to evaluate the indoor air flow and temperature distribution in office area using under-floor air-conditioning system (UFAC System) based on the results from physical measurements and to perform a Computer Fluid Dynamics (CFD) under the same condition of inlet and outlet as field measurement. The results from the CFD simulation are similar to those from the field measurement. The results show that UFAC system is provide proper indoor condition for occupants.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.1014-1019
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• 2009

The optimal control system for heat source and HVAC system has been developed for minimizing energy consumption while maintaining the comfort of indoor thermal environment in terms of the environmental variables such as time varying indoor load and outdoor temperatures. The optimal set-points of control parameters are supply air temperature and chilled or hot water temperatures. The optimal control study has been implemented for biosafety laboratory by using TRNSYS simulation program in order to investigate energy performance for heat source and HVAC system.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.689-694
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• 2009

On account of Indoor Air Quality(IAQ) deterioration by reason of high isulation and air tightness for energy saving, absence of energy efficiency ventilation system development that can be domestic existing window system, the cost increase and the energy addition loss by mechanical ventilation for IAQ improvement the ventilation obligation making design standard was prepared by a social and technical background and the necessity. In this study, open module type natural ventilation window system for energy saving included a fixed and continuous quantity ventilation was developed. The purpose that indoor thermal comfort environment evaluate of indoor resident.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.22 no.5
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• pp.314-321
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• 2010

This study examines the influence of functional interior factors on the variation of indoor environment to propose proper elements for planning studyrooms. Several factors that should be included in planning stages of the rooms are discussed to apply appropriate conditions for a pilot study. Field measurements and survey were performed in actual apartment buildings. The influence of lighting, thermal and acoustical conditions on comfort levels were examined.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2003.11a
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• pp.83-87
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• 2003

In recent days, IAQ(Indoor Air Quality) is regarded as one of the most important environmental factors as well as thermal and acoustic comfort. Various architectural materials are applied and air-tightness of the building is more strengthening to save energy consumption. This is why the air quality of the newly built houses became worse. In this study, contaminants(CO, CO$_2$, Radon, TVOCs, HCHO) density was measured in a newly built house and evaluation was carried out by ASHRAE and EPA Standards. As a result, CO, CO$_2$, TSP and Radon density of the newly built house was in a range of ASHRAE and EPA Standards, but it turned out TVOCs and HCHO density exceeds almost 3${\sim}$5 times in comparison with that of ASHRAE and EPA Standards.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2004.11a
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• pp.315-318
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• 2004

In recent days, IAQ(Indoor Air Quality) is regarded as one of the most important environmental factors as well as thermal and acoustic comfort. The purpose of this study was to estimate on effect of indoor air pollution from VOCs and formaldehyde emitted by building materials. As the results, we knew that concentration of Toluene, Xylene, Styrene and HCHO emitted from the furnitures and frame material of windows and doors are high emission factors on indoor air pollution.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.558-559
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• 2008

현재 수요반응(Demand Response) 프로그램은 발전설비 용량의 부족이나 높은 발전 연료비용의 상승으로 인해 다양한 나라들에서 도입되고 있는 실정이다. 그것은 실시간으로 소비자들이 그들의 소비패턴을 선택할 수 있는 프로그램이라 말할 수 있다. 다시 말하면, 수요반응이란 소비자들의 일반적인 전력소비패턴에서 전력가격이나 기타 다른 신호에 반응하여 전력 사용량을 변화시키는 것으로 정의할 수 있다. 수요반응의 효과는 전력가격의 급상승 방지, 공급 신뢰도 향상, 그로 인한 사회적인 복지향상 등 여러 가지 측면에서 생각해 볼 수 있다. 이러한 다양한 효과 가운데, 본 논문에서는 thermal comfort zone을 고려하여 수요반응 프로그램을 수행하는 동안 전력판매사업자 입장에서 최대의 이득을 얻기 위한 적정 인센티브와 부하 감축량을 결정한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1998.11a
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• pp.83-87
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• 1998

생활수준의 향상으로 에어컨의 보급이 확대되고 있다. 본 연구에서는 에어컨의 실내 온열환경 형성에서 가장 큰 부분을 차지하는 기류에 대한 온열쾌적감 평가를 하고자 하였다. 기존 에어컨의 기류조성방법은 주로 풍향을 변화시키는 것과 풍량을 변화시키는 것이었다. 따라서 본 연구에서는 에어컨의 베인 조작으로 기류감을 향상시키고 실내의 상하온도차를 최소화 할 수 있는 새로운 에어컨기류(감성기류)와 이미 제품화 되어있는 에어컨 기류와의 비교를 통해 가장 쾌적하고 편안한 에어컨기류를 찾고자 하였다. 31명의 피험자 체감실험을 통하여 감성기류, 풍량변화기류, 풍향변화기류의 전신온냉감 및 불쾌감을 비교한 결과 새로운 에어컨 기류인 감성기류가 전신온냉감 및 쾌불쾌감 측면에서 양호한 기류로 평가되었다.

• Journal of the Korean Society of Visualization
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• v.8 no.1
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• pp.25-30
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• 2010

The flow characteristics under recirculation cool vent mode is numerically studied using commercial fluid dynamic code(CFX). For the reliable analysis, real vehicle and human FE model is employed in grid generation process. The geometrical location and shape of panel vent, and exhaust vent is set as that of real vehicle model. The flowrate of the working fluid is determined as 330CMH which is equivalent to 70 percent of maximum capacity of HVAC system. The high velocity regions are formed around 4 each panel vent. Because of the non-symmetrically located exhaust, non-uniform flow and partial backflow near the door trim is observed. Streaklines start from each panel vent show the flow pattern of the airflow in the passenger's compartment very well.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1997.11a
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• pp.118-122
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• 1997

본 연구에서는 온열환경에 따른 쾌적감을 조사하기 위하여 온열환경을 평가할 수 있는 지표로서 생리신호를 분석하였다. 생리신호로는 인체의 자율신경계에 대한 반응을 나타내는 HRV변수 및 대뇌의 각성수준을 나타내는 CNA파형의 변이도를 이용하였다. HRV스펙트럼분석을 통해 얻어진 HF/LF변수를 이용하여 주어진 환경하에서 교감 및 부교감 신경의 활동성을 조사하였고, CNA 파형에서는 경고신호가 주어진 뒤 0.5-1초 구간의 면적값을 이용하여 온열쾌적감과의 상관성이 높게 나타나지 않은 반면, HRV스펙트럼분석에서는 휴지기에 비해 발과 얼굴부위에 대한 HF/LF값이 높은 사실을 통해 교감신경에 비해 부교감신경이 지배적이라는 사실을 알 수 있었다. 이러한 결과는 바과 얼굴이 주위온도에 따른 인체의 쾌적감을 변화시키는데에 있어서 주된 부위임을 나타내며 HRV스펙트럼분석 및 CNV파형의 관찰이 온열환경에 대한 쾌적감을 평가하는데 유용한 지표로 사용될 수 있음을 말해준다.