• Title/Summary/Keyword: Air Damper

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Characteristics of Wind Flow Variation with Wing Development of Space-Reduced Damper (공간축소형 댐퍼의 날개개도에 따른 풍량변화 특성평가)

  • Baek, Geun-Uk;Baek, Nam-Do;Lee, Myung-Won;Kang, Myungchang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.7
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    • pp.113-120
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    • 2021
  • An experimental device was designed to control the opening of a damper via operating the folding blade drive of the device and to control the amount of air flowing through the damper. In addition, an inverter was installed in the blower to control its fan rotation speed and hence the amount of air flowing through the damper. An experimental study was conducted on the opening of the folding blade damper and changes in the rotational speed of the blower. From the results, the theoretical air volume of the folding blade damper and experimental air volume were observed to be in good agreement within an error range of ±3%. As the mass flow rate of the air passing through the folding blade damper increases proportionally with the changes in damper opening and fan rotation speed, the performance of the damper can be controlled proportionally. The mass flow rate was also observed to increase linearly; therefore, the mass flow rate of the air passing through the folding blade damper increases proportionally with changes in the rotation speed of the blower, such that the performance of the damper is proportional to a constant air volume even with varying rotation speeds of the blower.

Balancing air flow at terminal in CAV duct system with DPM method (정풍량방식 덕트에서 이중압력측정방법을 이용한 취출구 풍량조정)

  • 이대우;박명식;박영우
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.1
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    • pp.66-78
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    • 1998
  • Adequate ventilation with the proper amount of air to the right place is important factor to achieve a good Indoor air climate. Thus it is of prime importance that the ventilation system is working properly. This requires reliable pressure loss calculation to balance the air flow through duct systems. So a computer program for balancing CAV duct system is developed In this study. The results of CAV duct system is compared with the "Balans" code developed by Larsen from Norway. To obtain the pressure drop characteristics of damper at duct terminal, some experiments are performed using DPM(Dual Pressure Measurement) system. To adjust the resistance of damper, present study suggests that some special diffusers should be designed and damper producers should give the data of air flow vs. pressure drop to the customs when they manufacture the damper. One of the results concludes that the working time can be reduced from several minutes to several seconds per damper in the present experimental site, if the DPM system and the air volume adjusting process are used.

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Analysis of Air Distribution in the Windbox System of the Utility Boiler (보일러 Windbox내 공기공급 계통의 유량분포 해석)

  • Park, Ho-Young;Kim, Sung-Chul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.9
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    • pp.581-589
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    • 2008
  • The pulverized coal combustion behavior in the utility boiler is very complex since so many physical and chemical processes happen in it, simultaneously. The mixing of pulverized coal with combustion air plays an important role in achieving the efficient combustion and stable boiler operation. The distribution of combustion air supplied to the furnace through the windbox damper system has not been clearly known since the individual measurements of air flow for each air nozzle were not possible, yet. The present study describes the CFD modelling of windbox damper system and aims to obtain the air flow rates and pressure loss coefficients across the present five damper systems, respectively. The one dimensional flow network model has been also established to get air flow distributions across the windbox damper, and applied to the actual plant operation condition. Compared with the designed air flow distribution, the modelled one gives a reasonable agreement. For the actual plant operation, the predicted air flow distribution at each air nozzle is differed with the designed data and strongly affected by the individual opening angle.

Design of Dynamic Characteristics Adjustable Integrated Air Spring-Damper Mechanism for Dual Shock Generation System (동특성 가변형 에어스프링-댐퍼 일체 구조의 이중 충격 발생장치 설계)

  • Yeo, Sung Min;Shul, Chang Won;Kang, Min Sig
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.3
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    • pp.331-341
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    • 2018
  • This study proposes an integrated serial spring-damper mechanism as a dual pulse generation system. Compared to the traditional dual pulse generation system, which used multiple springs and a damper to generate a dual pulse critical for impact testing of naval equipments, currently used separated serial spring-damper mechanism is comprised of two components: an air spring, and a damper. The proposed mechanism combines the two components into one integrated system with a unique design that lets simply changing the volume and the pressure of the air tank, and the length of the annular pipe adjust the stiffness and damping constants for testing, eliminating the need to have multiple sets of air springs and dampers. Simulations using MatLab and Simulink were conducted to verify the feasibility of this design. The results show the potential of an integrated serial spring-damper mechanism as a more convenient and flexible mechanism for dual pulse generation system.

Optimal Design of Air Dampers Applied on Wash Mechines (공기감쇠기의 최적설계와 세탁기에의 응용)

  • 양보석;이재무;하종훈
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.9
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    • pp.2477-2485
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    • 1994
  • Air damper has a great advantage that is independent of temperature change. This paper presents an analysis approach and an application for designing nonviscous air damper with a piston and a cylinder. The objective functions for optimum design is damping coefficient and is maximized by changing two design variables that are length between piston and cylinder and orifice diameter. A digital computer program was developed which determines optimal air damper configuration for maximum damping coefficients. The results were applied to the automatic washer and are confirmed to be valid for the range of operating conditions.

Development of Air Spring Damper System(ASDS) (공기 스프링 댐퍼 시스템(ASDS)의 개발)

  • Kim, Dong Baek;Park, Heung Sik
    • Journal of the Society of Disaster Information
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    • v.17 no.4
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    • pp.829-838
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    • 2021
  • Purpose: The Air Spring Damper System (ASDS) is proposed when existing concrete structures that have not been seismic resistant for economic and technical reasons or low-rise concrete structures that are difficult to earthquake. Method: To conduct a study on the damping force antigen in the kinetic equation of free vibration, we analyze whether this device has damping ability as a damper experimentally and theoretically, and examine the possibility of field application. Result: The air damper system is considered to be more economical than steel hysteresis dampers even if the number of dampers increases due to its easy manufacture and construction and low restrictions on shape, size, material, etc. Conclusion: In an air spring damper system, it is essential to reduce the diameter of the air inlet/outlet hole to improve the damping ratio, and in this case, if the diameter exceeds a certain lower limit, consideration of the compressibility of air is required, so further research is needed.

Investigation of Performent Standards for the Fire Damper (방화Damper의 성능기준 고찰)

  • Jo, Jung-Dal
    • Fire Protection Technology
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    • s.12
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    • pp.10-17
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    • 1992
  • Dampers which being installad in air duct are Valume damper, fire damper, leakage rated damper, but among them fire damper and leakage rated damper are used for preventing the spread of flame, hot gas and smoke through the duct. this report is aimed to intorduce the test example of the multiple fire damper which was conducted F.I.L.K, simuetaneously to investigate the performent standards and Structure of the fire damper which settled in several countries.

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Numerical Study on Air Egress Velocity of Ancillary Room Pressurization Systems in Apartment Fires (공동주택 화재 시 부속실 가압 시스템의 방연풍속에 관한 수치해석적 연구)

  • Kim, Byeongjun;Yang, Ying;Shin, Weon Gyu
    • 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.

A Study on the Development of a Circular CAV Damper (원형 CAV 댐퍼의 개발에 관한 연구)

  • Kwon, Youngpil
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.11
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    • pp.612-616
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    • 2013
  • A circular CAV damper has been developed, based on the investigation of the pressure loss, and the flow-resisting moment by the damper blade. When a torsional spring is attached to the damper axle, and the setting angle is adjusted to around $82^{\circ}$, the volume rate across the damper is almost independent of the static pressure. Such a CAV characteristic appears at an opening angle between $40^{\circ}$ and $60^{\circ}$, where the normalized moment decreases linearly with the angle. In addition, by adjusting the setting angle, the volume rate can be controlled to within 10% error, regardless of the pressure loss.