• Title/Summary/Keyword: Ventilation

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Estimation of Ventilation Volume by Traffic Ventilation Force in Tunnel (교통환기력에 의한 터널내 환기량 추정에 관한 연구)

  • 김종호;이상칠;도연지;김신도
    • Journal of Korean Society for Atmospheric Environment
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    • v.11 no.3
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    • pp.273-278
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    • 1995
  • This study is to estimate the ventilation volume by the traffic that originated from driving automobiles for two tunnels (Kugi tunnel and Kumhwa tunnel) that adopted natural ventilation system among tunnels of Seoul, and on the basis of which, we estimated the ventilation velume at various conditions. With the result of the estimation, we will present the basic method that can be operated with the optimum condition for the ventilation system. Estimating the predicted ventilation volume in the tennel by the pollutant concentration, we used traffic volume and CO emission data by the automobile speed and CO concentration in the tunnel. And, when we estimated the traffic ventilation volume by natural and traffic ventilation force, we used traffic volume, automobile speed, tunnel area, automobile area data and so on. As the result of simple regression between predicted ventilation volume and traffic ventilation volume, we attained the regression coefficient 0.88, and achieved the relation form that predicted ventilation volume equal 0.12x traffic ventilation volume-92, 000. Using this equation, we estimated the ventilation volume to satisfy the enviromnental standards of several space, and calculated the required volume for mechanical ventilation. Incase of Kumhwa Tunnel, there is a need of mechanical ventilation all day long to satisfy air quality standard 9 ppm for 8 hours average and 10 ppm for the indoor air quality standard of public facilities.

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Development of Vehicle Tunnel Ventilation System (도로터널 환기시스템 개발연구)

  • Lee, Chang-Woo
    • Proceedings of the SAREK Conference
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    • pp.71-74
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    • 2008
  • This paper aims at studying the key design elements for the optimal ventilation system design, developing the design models and suggesting the design guidelines. The key elements include the basic exhaust emission rate, wall friction coefficient, vehicle drag coefficient and slip streaming effect, jet fan operating efficiency, natural ventilation force and installation scheme for jet fans and ventilation monitors in tunnel. The design models developed in this study are one-dimensional ventilation simulator to analyze the air flow, pressure profile and pollutant dispersion inside and outside tunnel, expert model to choose the optimal ventilation method, and the ventilation characteristic chart to evaluate the preliminary ventilation system. The study results are reflected in the design guideline for road tunnel ventilation system.

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Investigation on Ventilation Mmethod and Recognition of Users in Healthcare Facilities of KOREA (국내 의료기관의 환기설비 운영실태 및 인식 조사)

  • Jo, Seongmin;Sung, Minki
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.24 no.2
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    • pp.7-14
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    • 2018
  • Purpose: The outbreak of Middle East Respiratory Syndrome(MERS) in KOREA has brought up the demands for ventilation guideline and regulations for healthcare facilities since most of the infection was spreaded inside healthcare facility. Currently KOREA has no ventilation guideline or regulations covering entire section of healthcare facility. The purpose of this study is to investigate current ventilation methods in KOREA healthcare facilities to in future, propose ventilation guideline. Methods: Research of foreign counties ventilation guideline and regulation for healthcare facilities were conducted for reference. Field investigation with survey of 21 healthcare were conducted to identify the ventilation system and operating methods. Additionally survey for healthcare workers were conducted to observe the recognition related to ventilation system in healthcare facility. Results: The result showed that most of foreign countries ventilation guideline and regulation suggests similar items to reduce the spread of infection and maintain good indoor air quality. The investigation results indicated that fixed guideline for ventilation in healthcare facility were required due to different ventilation operating methods. Survey result of healthcare workers has told us that ventilation guideline and regulation is needed to prevent further infection. Implications: Absence of ventilation guideline and regulations for healthcare facility in KOREA is an urgent issue.

Evaluating Natural Ventilation Performance of the Circular Ventilation Window using CFD Simulation (CFD 시뮬레이션을 활용한 원형 환기창의 자연환기 성능 평가)

  • Choi, Haneul;Na, Hooseung;Jia, Ruisi;Kim, Hyungkeun;Kim, Naree;Kim, Taeyeon
    • Journal of the Architectural Institute of Korea
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    • v.36 no.10
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    • pp.105-116
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    • 2020
  • The purpose of this study is to comprehensively evaluate the natural ventilation performance of the circular ventilation window. The circular ventilation window is a new type of window. This 145mm diameter window consists of a circular frame and a lid, and can be opened and closed. The circular ventilation window has a feature that the installation position and number are relatively free. We evaluated the natural ventilation performance of the circular ventilation window using CFD simulation. Based on the experiment, the CFD model was built, and case studies were performed under various conditions such as the window displacement, indoor/outdoor temperature difference, and outdoor wind speed. In addition, ventilation rates were compared with awning windows and casement windows. As a result, as the vertical distance between windows and the indoor/outdoor temperature difference increased, the ventilation rate tended to increase, and the ventilation pattern greatly changed according to the outdoor wind speed. Also, if the windows were arranged effectively, the ventilation rate could be increased compared to the existing windows.

Analysis of Ventilation Performance Using a Model Chamber

  • Kang Tae-Wook;Chang Tae-Hyeon
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.7
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    • pp.736-743
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    • 2005
  • In this study, three different types of mechanical ventilation systems are compared based on their ventilation characteristics: tracer gas concentration decay characteristics, and ventilation effectiveness by calculating actual ventilation air flow rate. The experiments are performed by using a step-down method for measuring tracer gas. $CO_{2}$ gas, concentration in the model chamber. Application of a mixing factor, k, was used and measured values ranged from 0.68 to 0.77. The Type 2 ventilation system was found to have the highest ventilation effectiveness rather than the Types 1 and 3.

Experimental Study on Removal Characteristics of Indoor Suspended Particulates by Ventilation. (환기에 의한 실내 부유오염입자 제거특성에 관한 실험적 연구)

  • Kang, Tae-Wook
    • Journal of the Korean Solar Energy Society
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    • v.25 no.4
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    • pp.133-139
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    • 2005
  • In this paper, the ventilation performance of suspended particulates in indoor side was investigated by step-down method. Experiments were performed in function of mechanical ventilation types and locations of supply and extract air. The type 2 ventilation system shows the highest removal characteristics rather than other 2 types. It means that the displacement ventilation has also good decay rates of concentration compared to mixing ventilation.

A Study on the Operational Strategy for Hybrid Ventilation System in Apartment unit focused on Indoor Air Quality (실내공기질을 고려한 공동주택의 하이브리드 환기 시스템의 운영에 관한 연구)

  • Lee, Yong-Jun;Leigh, Seung-Bok;Lee, Kyung-Hoi
    • KIEAE Journal
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    • v.4 no.3
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    • pp.203-210
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    • 2004
  • This dissertation identifies and investigates the possible control modes of hybrid ventilation system in applying to general apartments. It evaluates range of hybrid ventilation control modes in terms of indoor air quality, thermal comfort, and energy consumption in a living room and a kitchen of the $1000m^2$ apartment. The TRNSYS simulation program was used for evaluating the following four ventilation types : A ventilation mode relying on only infiltration for supplying air, A natural ventilation mode considering with weather condition, A hybrid ventilation (natural + mechanical ventilation) mode allowing minimum ventilation with no heat exchange, and a hybrid ventilation mode with heat exchange. This study shows the following results. As temperature being controlled by heating cooling equipments, there is without significant difference in thermal performance among ventilation types. Regarding Indoor Air quality, Indoor air contamination level of the hybrid ventilation case consistently keep the lower levels. The hybrid ventilation modes consume more energy by a 49% as compared to the A ventilation mode relying on only infiltration for supplying air. It is caused by the continuous ventilation for keeping good indoor air quality; the increase of energy consumption can be attributable to the increase of the heating energy. Therefore, the heat exchange between indoor and outdoor air is required during heating season in severe weather conditions. During the cooling seasons, Introducing natural ventilation can achieve energy saving by 40 ~ 45%. Thus, it can be an effective strategies for energy saving. Based on these results, a hybrid ventilation system can be suggested as an effective ventilation strategy for archiving high level of indoor air quality, thermal comfort, and energy consumption.

The Study of Jet Fan Control Logic for Longitudinal Ventilation in Road Tunnel (젯트팬 종류식 터널의 퍼지응용 제어로직에 관한 연구)

  • 유지오;남창호;신현준
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.12 no.8
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    • pp.763-770
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    • 2000
  • In tunnel ventilation, the Purpose of ventilation control is to keep the required pollution level with minimum consumption of energy But tunnel ventilation has large disturbances caused by discharge of pollutants, traffic forces especially strong for longitudinal ventilation. Hence in this paper, the tunnel ventilation control logic applying fuzzy control theories is proposed and the simulation program of tunnel ventilation control is developed. The characteristics of longitudinal ventilation with jet fans are estimated and the effect of the proposed tunnel ventilation control is verified by the simulation program.

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Evaluation of Radon Concentration according to Mechanical Ventilation Systems in Apartments (공동주택 내의 기계환기 설비에 따른 라돈농도 평가)

  • Choi, Jiwon;Hong, Hyungjin;Lee, Jeongsub;Yoo, Juhee;Park, Boram;Kim, Gahyun;Yoon, Sungwon;Lee, Cheolmin
    • Journal of Environmental Health Sciences
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    • v.47 no.4
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    • pp.330-338
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    • 2021
  • Background: This study was conducted to provide background information for the proper management of radon contamination in apartments using mechanical ventilation facilities in residential environments. Objectives: To this end, this study compared and evaluated changes in radon concentrations based on different operating intensities of mechanical ventilation with or without natural ventilation. Methods: For the continuous measurement of radon concentrations, an RAD7 instrument was installed in four apartments equipped with a ventilation system. The measurements were done for comparison of ventilation types and different ventilation intensities ("high", "middle", "low"). Results: The results confirmed that both mechanical and natural ventilation sufficiently reduced the radon concentration in the apartments. In particular, mechanical ventilation at "high" intensity was the most effective. Natural ventilation combined with mechanical ventilation and then natural ventilation alone were the second and the third most effective, respectively. Conclusions: When using ventilation to reduce indoor radon concentrations, it is most effective to operate mechanical ventilation ("high") or natural ventilation and mechanical ventilation at the same time. In cases where mechanical ventilation is available alone, it is recommended to operate it at a minimum of "middle" intensity.

Numerical Analysis of Moisture Ventilation in the Dry Room (Dry room내 수분환기에 대한 수치적 연구)

  • 이관수;임광옥;정영식
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.12 no.10
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    • pp.908-916
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    • 2000
  • In this paper, the characteristics of moisture ventilation in the lithium ion battery manufacturing dry room are studied numerically using standard $k-\varepsilon$ turbulence model. Both the steady-state and the unsteady behaviors of moisture ventilation are analyzed by considering local and uniform moisture generation. In order to evaluate the characteristics of moisture ventilation, three scales of ventilation efficiency and characteristic ventilation time are presented from the numerical results. It was shown that moisture distribution was dependent strongly on the flow field. The characteristics of moisture ventilation were improved by 20% and 40% in terms of the 1st scale of ventilation efficiency (SVE1) and the 2nd scale of ventilation efficiency (SVE2), respectively, through the modifications of design variables such as the addition of inlets, outlets and partition. A significant improvement in the characteristic ventilation time and the moisture exhaust efficiency was also made by these modifications.

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