• Fire Science and Engineering
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• v.30 no.4
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• pp.82-87
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• 2016

The ventilation system for the efficient operation of the building services systems in the ventilation plan of super high-rise buildings is used to combine smoke control systems. This study evaluated models of super high-rise buildings with four basement levels and 59 stories and investigated the pressure distribution of each floor by the smoke driving forces by numerical analysis. The smoke driving forces on the building of analytical model was analyzed to determine the effects of the ventilation plan and smoke control plane. In addition, when a combination with ventilation and smoke control of the kitchen ventilation damper in the ventilation plan of analysis model building was designed based on the these results, the relationship between the opening and closing force of the damper and smoke driving combined forces to act on the design pressure of the damper by a motion analysis simulation. The driving units of the damper were selected from the analytical results.

• Proceedings of the Membrane Society of Korea Conference
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• 1996.03a
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• pp.127-158
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• 1996

투과증발은 막분리 기술의 하나로 역삼투막, 한외여과막 등의 다른 막분리와 달리 혼합물 분리가 막소재 물질과 분리 대상 유기물 사이의 화학 친화도에 의해 이루어지기 때문에 혼합물중의 특정 성분에 대한 선택도가 높은 비다공성 고분자 복합막이 사용된다. 투과증발막 투과의 구동력은 투과 성분의 활동도(activity) 차로 이는 부분 증기압차로 구체화되며, 이 구동력을 높이기 위해서 feed side는 고온 유지를 위한 열교환기가 필요하며 permeate side는 진공하에서 감압에 의한 증기상으로의 전환을 이루게 하며 이를 다시 응축하여 연속 투과가 일어날 수 있게 한다. 따라서 투과증발의 핵심 기술은 분리하고자 하는 물질에 대하여 높은 투과선택도(permselectivity)를 갖는 투과증발막의 제조 기술이며, 제조된 막을 실공정에 적용하기 위한 모듈 설계, 제작 기술과 이를 시스템화하여 실규모로 Scale-up 할 수 있는 시스템 설계 기술도 실용화를 위해서 반드시 이루어져야 한다.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.29 no.4
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• pp.175-184
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• 2017

With the improvement of living standards, the ventilation for the mitigation of indoor or outdoor air-pollution problems has recently attracted a lot of attention. Consequently, the ventilation for the supply of outdoor fresh air into a room is treated as an important building-design factor. The ventilation is generally divided into the forced and natural types; here, the former can control the ventilation rate by using mechanical devices, but it has the disadvantages of the equipment costs, maintenance costs, and noise generation, while the latter is applied to most workshops due to the absence of noise and the low installation and maintenance costs. In this experimental study, the ventilation performance of a typical rotating-type natural ventilator, which is called a "wind turbine," was investigated with the outdoor-wind velocity and the indoor/outdoor-temperature difference. From the experiment results, it was confirmed that the temperature difference of $10^{\circ}C$ corresponds to the ventilation driving force with an outdoor-wind velocity of 1.0 m/s. Additionally, the intake-opening area of a building also exerts a great effect on the ventilation rates.

• Journal of the Korea Organic Resources Recycling Association
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• v.22 no.3
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• pp.60-67
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• 2014

Exhaust system used in toilet and cooking place of high riser public house is roof fan of two basic types : natural roof ventilator and natural/forced roof ventilator. Natural/forced roof ventilator has a motor in the rotary shaft. There are many high riser public house in Korea. These buildings were not viewed as being major contributors to exhaust pollutants producted in indoor. It was because many engineers thought that exhaust in high riser building depend on stack effect. This study investigates on stack pressure determined by exterior pressure and the difference pressure control in exhaust stack used in high riser public house. This paper focuses mainly on the effect of the time interval for power supply of motor installed in roof fan with function of natural wind velocity and of exhaust air volume of toilet. It is observed there are higher exhaust efficiency than the existing natural roof ventilator.