• 제목/요약/키워드: mechanical HVAC

검색결과 96건 처리시간 0.027초

자동차 실내 환경에 관한 수치적 연구 (A Numerical Study on Automobile Interior Environment)

  • 전희호;고석보;이금배
    • 설비공학논문집
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    • 제19권1호
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    • pp.36-42
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    • 2007
  • The latest cars give much importance in the role of HVAC system that controls the environment of the area for passengers more than just basic capability In this study, we drew the automobile interior as three dimension and arranged a method of numerical analysis on HVAC environment in the automobile interior displaying air current distribution and temperature distribution through simulation of the automobile interior on the ventilation volume and outlet area, The aim of this study is to develop the estimated method for HVAC environment in the automobile interior. Results of numerical analysis, to cool automobile interior needs more considerations if thinking cheerful surroundings of automobile interior air but the more magnitude of outlet is small, the more cooling capability is excellent and realistic countermeasures about a realistic geometry and boundary condition.

공조기가 설치된 고분 내에서의 열 및 음 환경 평가 (Evaluation of the Thermal and Noise Environment in an Ancient Tomb installed a Duct-type HVAC System)

  • 박진양;전희호;전용두;이금배
    • 설비공학논문집
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    • 제19권3호
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    • pp.228-234
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    • 2007
  • Opening an ancient tomb interior can deal fair damage for preservation in long period because of high moisture. In this study, a duct-type HVAC system was installed to preserve an ancient tomb and temperature and humidity was measured to analyze heat environment. Armhole was measured to search whether an ancient tomb receives effects of vibration caused by a duct-type HVAC system. According to the measured data, temperature in an ancient tomb is kept adaptively in conservation regardless of a duct-type HVAC system installation when it rains in summer. The other side, humidity is kept adaptively in conservation when installed duct-type HVAC system. But when it is in natural state, a lot of humidity by dew condensation phenomena. So it needs a duct-type system for an ancient tomb conservation. In the case of vibration, measurement value of 3 satisfy control but Germanic DIN 4150 does not satisfy. Therefore, equip must be such that it can prevent vibration for safety.

HVAC 관련 매개변수 및 탑승조건에 따른 자동차 실내의 온열쾌적성 평가모델에 관한 수치해석적 연구 (A Numerical Study of Automotive Indoor Thermal Comfort Model According to Boarding Conditions and Parameters Related to HVAC)

  • 윤성현;박준용;손덕영;최윤호;박경석
    • 대한기계학회논문집A
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    • 제38권9호
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    • pp.979-988
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    • 2014
  • 자동차를 이용하는 시간이 늘어남에 따라 자동차 실내의 온열쾌적성에 대한 관심이 급증하고 있다. 그러나 아직까진 실제 자동차 중에서 공조시스템의 냉방성능은 자동차 제조사별로 온열쾌적성 지표를 통해 평가되지 않고, 실내의 공기 속도와 온도 등 열환경 기준에 의해 평가되고 있다. 또한 차 실내의 온열쾌적성을 수치해석으로 평가하는 경우 타당한 결과를 도출할 수 있는 수치기법에 대한 기준이 확립되지 않은 상황이다. 본 연구에서는 외부 열원을 모사하기 위하여 태양광선 추적모델을 사용하고, 공조시스템 작동 후 20 분까지 다양한 매개변수(공조시스템의 작동모드와 작동풍량, 인체모델 탑승조건)에 대한 자동차 실내의 온열쾌적성 평가를 수행하였다. 이를 통해 자동차 실내의 온열쾌적성 지표를 예측할 수 있는 평가모델을 도출하였다.

자동차 냉/난방 성능 향상을 위한 공기조화 덕트의 기류해석 (Aerodynamic Analysis of Automotive HVAC Duct for Enhancement of Cooling/Heating Performance)

  • 주재우;이기돈;허만웅;김광용;박준규;윤정환;김홍빈
    • 설비공학논문집
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    • 제24권1호
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    • pp.23-28
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    • 2012
  • In the present work, numerical analyses of air flow in HVAC duct have been carried out for enhancement of cooling/heating performance. For the analyses, three-dimensional Reynolds-averaged Navier-Stokes equations have been solved with the shear stress transport turbulence model. The numerical results were validated in comparison with the experimental data. Based on the numerical results, the HVAC duct was designed to reduce the pressure loss. The modified duct geometry shows largely reduced pressure drop in comparison with the reference geometry. And, through modified duct shape, the performance of air conditioning has been enhanced.

배기열회수 알루미늄 열교환기의 공조시스템 적용에 관한 연구 (The Study on the Application of Heat Recovery Aluminium Heat Exchanger in HVAC System)

  • 박용효;김동규;김근오;정용환;금종수;정석권
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.1272-1276
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    • 2009
  • The purpose of this study is to introduce wasted heat recovery heat exchanger for different kind of material in HVAC systems in field. For the purpose of estimating the large volume rotary heat exchanger and cross flow plate heat exchanger in heat recovery ventilator.

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제진재의 최적배치를 이용한 차량공조시스템의 음질개선 (Improvement of Sound Quality for the Vehicle HVAC System Using Optimum Layout of Damping Material)

  • 오재응;황동건;박상길;윤태건;심현진;이정윤
    • 대한기계학회논문집A
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    • 제30권6호
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    • pp.728-733
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    • 2006
  • The reduction of the Vehicle interior noise has been the main interest of NVH engineers. The driver's perception on the vehicle noise is affected largely by psychoacoustic characteristic of the noise as well as the SPL. In particular, the HVAC sound among the vehicle interior noise has been reflected sensitively in the side of psychology. In previous study, we have developed to verify identification of source for the vehicle HVAC system through multiple-dimensional spectral analysis. Also we carried out objective assessments on the vehicle HVAC noises and subjective assessments have been already performed with 30 subjects. In this study, the linear regression models were obtained for the subjective evaluation and the sound quality metrics. The regression procedure also allows you to produce diagnostic statistics to evaluate the regression estimates including appropriation and accuracy. Appropriation of regression model is necessary to $R^2$ value and F-value. And testing for regression model is necessary to independence, homoscedesticity and normality. Also we selected optimum layout of damping material using Taguchi method. As a result of application, sound quality is improved more quietly, powerfully, even though costly, and smoothly.

사무소 건물의 공조설비소음 특성 (The Characteristics of HVAC Noise in Office Buildings)

  • 도영주;김동규;김흥식
    • 한국음향학회지
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    • 제8권1호
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    • pp.59-66
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    • 1989
  • 공조설비소음의 특성을 파악하기 위하여 서울의 도심에 위치한 고층 사무소 건물을 대상으로 송풍기의 파워레벨과 취출구를 통한 실내소음레벨을 측정하였다. 또한 공조설비소음이 문제시되는 건물에 흡음챔버와 사이드브랜치를 설치하여 소음기의 감음성능을 평가하였다. 연구의 결과, 실내소음레벨은 송풍기 발생소음의 영향으로 500Hz 이하의 저주파수 대역에서 ISO의 허용 기준치인 NR40을 초과하였으며 흠음챔버는 넓은 대역의 주파수, 사이드브랜치는 특정공명주파수에서 감음효과가 크게 나타났다.

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사무소 건물의 HVAC&R 시스템 에너지 분석방법 및 예측 프로그램 개발 (Development of an HVAC&R Systems Energy Evaluation Methodology and Simulation Program for Office Buildings)

  • 조진균;신승호;김종헌;황동곤;홍희기
    • 설비공학논문집
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    • 제25권7호
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    • pp.363-370
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    • 2013
  • HVAC&R systems are the most energy consuming building services, representing approximately half of the final energy use in the building sector. Despite their significant energy use, there is a lack of a consistent and homogeneous framework to efficiently guide research. This research is about the energy consumptions of HVAC&R systems, with the aim of establishing a common idea for the analysis of building energy efficiency. Our approach deals with the concept of an HVAC&R set that is composed of subsystems. A matrix combination evaluation is examined, and a total of 960 sets can be implemented in a large scale office building. A method as a tool for energy evaluations of HVAC&R systems, and HEET as a energy simulation program, were developed.

Application Study of Reinforcement Learning Control for Building HVAC System

  • Cho, Sung-Hwan
    • International Journal of Air-Conditioning and Refrigeration
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    • 제14권4호
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    • pp.138-146
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    • 2006
  • Recently, a technology based on the proportional integral (PI) control have grown rapidly owing to the needs for the robust capacity of the controllers from industrial building sectors. However, PI controller generally requires tuning of gains for optimal control when the outside weather condition changes. The present study presents the possibility of reinforcement learning (RL) control algorithm with PI controller adapted in the HVAC system. The optimal design criteria of RL controller was proposed in the environment chamber experiment and a theoretical analysis was also conducted using TRNSYS program.

지하철 역사의 실내공기질 개선을 위한 공조기 적용 공기청정장치 선정에 대한 기초연구 (Study of HVAC system with air cleaning system for indoor air quality of subway station)

  • 정의경;박재홍;이양화;윤기영;황정호
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2008년도 동계학술발표대회 논문집
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    • pp.537-540
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    • 2008
  • A numerical study has been carried out on the optimization of an air cleaning system which was installed in a heating, ventilation and air conditioning system (HVAC) system of subway station for particle removal. Required particle removal efficiencies of three different air cleaning systems were calculated from ventilation rate, and indoor/outdoor concentration of PM10. Mass balance equations of PM10 were used to solve the required particle removal efficiencies. Fibrous filter was considered as an air cleaning system. Calculations were carried out about two different places which were waiting area and platform of subway station, respectively. This study proposed optimized design and operation condition of each air cleaning system.

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