• Title/Summary/Keyword: AC (Air conditioner)

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PFC Dual Boost Converter Based on Input Voltage Estimation for DC Inverter Air Conditioner

  • Park, Gwi-Geun;Kwon, Kee-Yong;Kim, Tae-Woong
    • Journal of Power Electronics
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    • v.10 no.3
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    • pp.293-299
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    • 2010
  • In this paper, a single-phase PFC (Power Factor Correction) dual boost converter based on input voltage estimation is studied for DC inverter air conditioner. It is focused on improving input power factor and power quality to satisfy the recent harmonic current regulation standards. Furthermore the input voltage estimation is introduced for price competitive products. A low cost and reasonable control system is implemented using a specified high-speed 32-bit microprocessor. Their effectiveness are verified through theoretical analysis and experiments.

PFC Bridge Converter for Voltage-controlled Adjustable-speed PMBLDCM Drive

  • Singh, Sanjeev;Singh, Bhim
    • Journal of Electrical Engineering and Technology
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    • v.6 no.2
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    • pp.215-225
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    • 2011
  • In this paper, a buck DC-DC bridge converter is used as a power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of the PFC converter is a diode bridge rectifier (DBR) fed from single phase AC mains. The PMBLDCM is used to drive the compressor of an air conditioner through a three-phase voltage source inverter (VSI) fed from a variable voltage DC link. The speed of the air conditioner is controlled to conserve energy using a new concept of voltage control at a DC link proportional to the desired speed of the PMBLDC motor. Therefore, VSI operates only as an electronic commutator of the PMBLDCM. The current of the PMBLDCM is controlled by setting the reference voltage at the DC link as a ramp. The proposed PMBLDCM drive with voltage control-based PFC converter was designed and modeled. The performance is simulated in Matlab-Simulink environment for an air conditioner compressor load driven through a 3.75 kW, 1500 rpm PMBLDC motor. To validate the effectiveness of the proposed speed control scheme, the evaluation results demonstrate improved efficiency of the complete drive with the PFC feature in a wide range of speed and input AC voltage.

AC-DC Converter Control for Power Factor Correction of Inverter Air Conditioner System (인버터 에어컨 시스템의 역률보상을 위한 AC-DC 컨버터 제어)

  • Park, Gwi-Geun;Choi, Jae-Weon
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.2
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    • pp.154-162
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    • 2007
  • In this paper, we propose a new AC-DC converter control method to comply with harmonics regulation(IEC 61000-3) effective for the inverter system of an air conditioner whose power consumption is less than 2,500W. There are many different ways of AC-DC converter control, but this paper focuses on the converter control method that is adopting an input reactor with low cost silicon steel core to strengthen cost competitiveness of the manufacturer. The proposed control method controls input current every half cycle of the line frequency to get unit power factor and at the same time to reduce switching loss of devices and acoustic noise from reactor. This kind of converter is known as a Partial Switching Converter(PSC). In this study, theoretical analysis of the PSC has been performed using Matlab/Simulink while a 16-bit micro-processor based converter has been used to perform the experimental analysis. In the theoretical analysis, electrical circuit models and equations of the PSC are derived and simulated. In the experiments, micro-processor controls input current to keep the power factor above 0.95 by reducing the phase difference between input voltage and current and at the same time to maintain a reference DC-link voltage against voltage drop which depends on DC-link load. Therefore it becomes possible to comply with harmonic regulations while the power factor is maximized by optimizing the time of current flow through the input reactor for every half cycle of line frequency.

Auxiliary Power Supply using Photovoltaic Power Generation for Air-Conditioner (태양광발전을 이용한 에어콘의 보조운전 제어 시스템)

  • 황인호;유권종;송진수;이후기;정찬규
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1993.05a
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    • pp.47-52
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    • 1993
  • Recently, as exactly clean source, the research of photovoltaic power generation is undertaken actively and widely. In this paper, an auxiliary power supply system which is composed of photovoltaic generation and DC-DC boost chopper is described. This system in mainly for Air-conditioner appliances is which AC source is formed through rectifying circuit and without electrical storage battery. There exist two operating modes depending on the power quantity of the solar cells and the load. The control algorithm is discussed.

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System Performance with Variation of Outdoor Unit Layouts at Building Re-entrants

  • Koh, Jae-Yoon;Lee, Hyun-Gu;Zhai, John
    • International Journal of Air-Conditioning and Refrigeration
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    • v.16 no.1
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    • pp.15-21
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    • 2008
  • Air-cooled split-type air conditioners (AC) are very popular in high-rise residential and commercial buildings in Korea. The performance of such AC systems varies significantly with system characteristics and environmental conditions. Particularly, the outdoor condensing unit of the system, if poorly cooled due to high density of AC distribution and restricted outdoor space, will result in large decrease of cooling efficiency and increase of electrical energy consumption and may further jeopardize the system reliability. This paper presents a numerical analysis on the thermal and energy performance of a group of air-cooled air conditioners installed at a courtyard of a high-rise building. The study introduces a series of new energy performance indices to assess the group performance of the AC condensers with different outdoor unit layouts. The results not only indicate the COP of the systems, but also quantify the system capacity and energy consumption. The evaluation method and indices developed are useful for guiding the design of the distribution plan of the AC units at building re-entrants.

Power-factor improvement of residential solar air-conditioner power system (가정용 태양광 에어컨 전원시스템의 역률 개선)

  • Park, Y.J.;Mun, S.P.;Park, J.W.;Suh, K.Y.;Kim, Y.M.
    • Proceedings of the KIEE Conference
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    • 2002.06a
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    • pp.6-8
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    • 2002
  • Generally in solar air conditioning system, the diode rectifier is used to build up DC link voltage from AC source. The diode rectifier is simple and cheap but it brings out the problems of low power factor and plentiful harmonics at the AC source. Also It can degrade the utilization rate of solar energy because the reverse of power flow cannot be made. Hence, in this paper to overcome the peak power problems in summer and to endure good AC input characteristics, solar air conditioning system using the PWM converter is proposed. A high input power factor of 97[%] and an efficiency of 98[%] are also obtained. The harmonic guide lines of proposed rectifier is no interfered with inverter switching, resulting in a simple, reliable and low cost ac to dc converters in comparison with the boost type current improving circuits.

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A Study on Combustion Experiments of Multi Type Air-Conditioner Outdoor Units by Large Scale Calorimeter (라지스케일 칼로리미터에 의한 멀티시스템형 에어컨실외기의 연소실험에 관한 연구)

  • Min, Se-Hong;Bae, Yeon-Jun
    • Fire Science and Engineering
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    • v.25 no.6
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    • pp.168-177
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    • 2011
  • The combustion test for real box of AC outdoor unit has been performed in this study in order to estimate the fire hazard in multi-system type of AC outdoor unit which is currently used for commercial use. The result showed that in test, there was explosion inside of AC outdoor unit, and flame erupted and fire spread through upper side grill. And then this fire burnt the combustibles such as wires, electronic control board, heat exchange copper plate and plastics etc inside the unit, refrigerant gas pipe was burst due to fire, and accelerated the explosion and flame eruption to outside while the refrigerant was erupting. It is found in this test that the maximum heat release rate of AC outdoor unit is 5,830 kW, the maximum internal temperature measured with infrared camera and thermocouple is $1,201^{\circ}C$, maximum ambient temperature is $881^{\circ}C$, and flame rose higher than about 5 m. It is concluded that the fire in AC outdoor unit cause fire to combustibles around the unit, and may give big damage by generating the secondary fire. It is expected that the result obtained from the test on the real object may be applied to fire realization of AC outdoor unit and estimation of fire spreading to the combustibles around in the future computer simulation.

Experimental Study of Improving Electromagnetic Sound for Indoors side Package Air conditioner (패키지형 에어컨 실내기 자기음 개선을 위한 실험적 연구)

  • 김문섭;구형모;모진용;박득용;한형석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.138-140
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    • 2003
  • In this paper, It is introduced to electromagnetic sound by AC motor and example of application by experiments. And Through adjusting some design parameter related to Mass, Damping coefficient and Stiffness of the system, we could find best design point to reduce motor total noise as well as noise component at AC power frequency (2f).

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Electrical and Structural Design of Air-conditioning Fan Motor for Noise Reduction

  • Han Hyung-Suk;Mo Jin-Yong;Kim Chang-Hyun;Lee Jae-Kwon;Jeong Weui-Bong
    • Journal of Mechanical Science and Technology
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    • v.20 no.10
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    • pp.1653-1661
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    • 2006
  • AC induction motors have been widely used for fan motor of the air conditioner indoor unit. Noise of these AC induction motors is usually caused by the coupling effects of structural and electrical systems. The rotating torque and the noise from AC induction motor were discussed in this paper,. First, the modification of motor was carried out in order to reduce the unbalance magneto motive force between main and sub winding. Second, structural modification based on normal mode analysis and modal testing was carried out so that the fan motor does not have the natural frequencies near the 2f-line frequency. Numerical modifications through these two processes were verified by experiments, which showed that the sound pressure level at 2f-line frequency of the modified system became about 25dB less than that of conventional one.

A study of residential solar airconditioning system using bidirectional PWM converter (양방향성 PWM컨버터를 이용한 가정용 태양광 에어컨 시스템에 관한 연구)

  • 유권종;송진수;황인호;김홍성;고재석;최규하;김한성
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.3
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    • pp.358-364
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    • 1996
  • Recently, much power demand from domestic power consumer is weakening the allowable power reserve margin in summer, especially at midday for one day due to a steep increase of air cooling loads such as air conditioner. Therefore solar airconditioning system can'be considered as one of the best remedies to meet the increase of peak power. Generally in solar air conditioning system, the diode rectifier is used to build up DC link voltage from AC source. The diode rectifier is simple and cheap but it brings out the problems of low power factor and plentiful harmonics at the AC source. Also It can derate the utilization rate of solar energy because the reverse of power flow cannot be made. Hence, in this paper to overcome the peak power problem in summer and to endure good AC input characteristics, solar air conditioning system using the PWM converter is proposed. As results, obtained are the characteristics of the PWM converter such as low distorted current waveform, high power factor and bidirectional power control. And also the stability of proposed system is verified by examining the dynamics of step load change and power reversal testing. (author). refs., figs., tabs.

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