• 방재와보험
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• s.77
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• pp.16-23
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• 1998

• 방재와보험
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• s.74
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• pp.30-32
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• 1997

• 방재와보험
• /
• s.76
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• pp.34-40
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• 1998

• 방재와보험
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• s.73
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• pp.26-29
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• 1997

• Fire Science and Engineering
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• v.23 no.5
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• pp.117-124
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• 2009

The objective of this research is to analyze the ventilation performance of mechanical ventilation systems to enhance removal efficiency of indoor hamful gases. The ventilation performance is evaluated using a step-down method based on ASTM Standard E741-83. The ventilation performance is evaluated as a function of the ventilation rate and supply/extract locations using a tracer gas ($CO_2$) technique. As a result, the $CO_2$ concentration as a function of time is decayed exponentially and the ventilation performance is found to increase with increased the ventilation rate. The ventilation performance of the second type ventilation system is better than that of the first type or the third type. The ventilation performance without human occupancy increases up to 55% and the ventilation performance with one person increases up to 25% at the supply air of 570Lpm comparing with a natural reduction after one hour in the test chamber. The ventilation performance is better than 15% comparing with natural decay at the supply of 570Lpm in an office room.

• Fire Science and Engineering
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• v.32 no.6
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• pp.15-21
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• 2018

This study examined the flow characteristics of fire smoke under pressurized air ventilation conditions by carrying out fire simulations on multi-compartment enclosure, including room, ancillary room and stair case. Fire simulations were conducted for the air-leakage test facility, which was constructed to measure the effective leakage area and aimed to improve the understandings of fire and smoke movement by analyzing the overall behaviors of fire smoke flow and pressure distributions of each compartment. The simulation results showed that the heat release rate of the fires was controlled sensitively by the amount of air supplied by the ventilation system. An analysis of the velocity distributions between the room and ancillary room showed that fire smoke could be leaked to the ancillary room through the upper layer of the door, even under pressurized air supply conditions. From these results, it was confirmed that the fire size and spatial characteristics should be considered for the design and application of a smoke control system by a pressurized air supply.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.2
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• pp.39-45
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• 2000

1970년대부터 사용된 변풍량 공조 시스템 (Variable Air Volume System)은 실내 부하 변동에 따라 급기 온도를 일정하게 유지시키고 실별, 존별 송풍량을 변화시켜 실온을 제어하는 방식으로, 에너지 절약, 개별 제어 등의 장점 때문에 적용이 확대되었고 특히 단일덕트 변풍량 공조 시스템은 이러한 이유 때문에 많은 건물에 적용되고 있다. 그러나 현 제어시스댐의 풍량 측정의 문제점과 공조기내에서 풍량변화 및 급/배기 댐퍼의 개도 변경으로 인한 환기 댐퍼의 비선형 특성을 고려하지 않고 제어하기 때문에 외기량 확보를 정확히 유지 못하는 실정이다. 따라서 단일덕트 변풍량 시스템의 환기댐퍼 및 급기, 환기 팬의 제어 방식의 종류와 특성 및 문제점에 대하여 설명하고자 한다.

• Fire Science and Engineering
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• v.34 no.4
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• pp.78-86
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• 2020

In this study, numerical simulations were performed on the air egress velocity of pressurization systems in an ancillary room when a fire occurred in an apartment house. The relationship between the air supply flow rate of a damper and air egress velocity at a fire door is predicted to be linear. Additionally, a minimum flow rate of the damper, which meets national fire safety standards for air egress velocity, i.e., 0.7 m/s can be estimated. Air egress velocity at the fire door is analyzed according to the supply air direction and installation height of the damper. When the damper has an upward supply air direction and is installed at a high level, the egress velocity at the top section of the fire door is larger, whereas the soot concentration at the ancillary room is lower than when the supply direction of the damper is downward. Therefore, it is found that increasing the air egress velocity at the top section of the fire door helps to efficiently prevent the inflow of smoke.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.8
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• pp.50-58
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• 2000

실내공기질과 환기풍량 그리고 HVAC 관련 비틀은 서로 밀접한 관계가 있다. 공기대 공기 열 교환기를 이용하여 급기를 가열 또는 냉각함으로써 제습이나 가습의 필요성을 크게 줄일 수 있다. HVAC 설치 및 운전비용을 결정하는 가장 중요한 요소는 소요환기량, 기후변수, 열교환기 성능변수 그리고 운전기간 등이다.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.1
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• pp.50-57
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• 2006

This study describes to analyze the cooling load characteristics for a room air conditioner as a function of supply ventilation air when an air conditioner is running An experimental apparatus consists of a test room, a room air conditioner, a humidifier, an electrical heater a supply fan and a controller The reaching time to the inside setting temperature of the room air conditioner with is evaluated theoretically and experimentally in a conditioned space cooling loads such as supply ventilation air, lighting, occupancy and infiltration. In the conditions of cooling loads for the supply ventilation air of 9.5 L/s(0.98 ACH). lights. one Person, and infiltration, the reaching time to the inside setting temperature ($27\;^{\circ}C$ dry-bulb) increases up to $35\%$ more than for no supply ventilation air condition. Theoretical modelling of the reaching time shows good agreement with experimental results.