• Journal of Power Electronics
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• v.12 no.6
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• pp.1003-1010
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• 2012

Recent power electronics and variable-frequency motor drive technologies have been applied to air conditioners to improve efficiency and power density. However, the mechanical vibrations and acoustic noise resulting from the compressor still remain as a serious problem. This paper presents the development and implementation of an online disturbance state-filter for the suppression of multiple unknown and time-varying vibrations of air conditioning systems. The proposed design has a form of the state-filter based on a Luenburger-style closed-loop speed observer. An active vibration decoupling strategy with an estimated disturbance is provided, which manipulates a motor torque command. Since the proposed estimation does not require any additional transducers or hardware for obtaining real-time information upon disturbances, it is suitable for retrofitting industrial air conditioners.

• Air Cleaning Technology
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• v.10 no.3 s.38
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• pp.40-49
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• 1997

• Air Cleaning Technology
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• v.3 no.3 s.11
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• pp.12-25
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• 1990

• Air Cleaning Technology
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• v.3 no.1 s.9
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• pp.62-76
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• 1990

• Air Cleaning Technology
• /
• v.3 no.1 s.9
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• pp.135-136
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• 1990

• Air Cleaning Technology
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• v.15 no.1 s.56
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• pp.67-76
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• 2002

• Air Cleaning Technology
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• v.15 no.1 s.56
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• pp.77-83
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• 2002

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.465-466
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• 1999

섬유층 여과기(fibrous filter)는 일반적으로 공기여과기(air filter) 라고 불리는 여과기로 fiber의 직경, filter의 두께, 공극률, 하전 여부에 따라 그 용도가 다양하다. 전하를 가진 섬유로 제조한 정전 필터는 장시간 사용시에 일반 섬유층 필터에 비해 작은 압력강하와 높은 집진 효율을 나타내기 때문에 성능과 수명이 증가한다.(중략)

• Proceedings of the SAREK Conference
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• 2004.11a
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• pp.61-61
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• 2004

• Journal of Korean Society for Atmospheric Environment
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• v.29 no.5
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• pp.625-633
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• 2013

This study attempted to find an alternative method for fine dust control in the pre-exiting facilities of metro-subway stations. A new double-layer design was proposed for the MVAC (mechanical ventilation and air control) system. Several filter lay-outs were combined a pre-filter with electret filter (EF), electret bundle filter (EBF), or electret pleated filter (EPF), and were then examined focusing on the collection efficiency of particulate matters and pressure drop across the filter layers. The experimental results from the lab and field tests showed the best collection efficiency with EPF, which achieved 85% for $PM_{10}$ and 55% for $PM_{2.5}$. It was also found from the long term field test that the new filter lay-out could provide quite consistent dust level particularly in underground platform regardless of external condition.