• Title/Summary/Keyword: Air conditioner control

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Modelling of System Air-Conditioner for Dynamic Simulation (동적시뮬레이션을 위한 시스템 멀티에어컨의 모델링)

  • Lee, Yoon-Jong;Kim, Chan-Jung;Moon, Je-Myung;Kim, Cheol-Woo;Seo, Hyeong-Joon;Kim, Gyoung-Rok;Shin, Haeng-Cho;Hong, Hi-Ki
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.328-333
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    • 2007
  • The purpose of this study is modelling of system air-conditioner for TRNSYS. System air-conditioner is operated by a variable capacity compressor and accommodated by multiple evaporators. By reason of these feature, realizing performance of system air-conditioner for TRNSYS was incomplete. In this study performance data of system air-conditioner and control logics are used to make system air-conditioner module for TRNSYS. Performance data contains total capacity, power input and capacity index of system air-conditioner. The simulation was carried out in a mode of temperature level control using TRNSYS 16. The simulation shows that the system air-conditioner model operate variable capacity and can compute capacity index and power input of system.

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Development of Variable Duty Cycle Control Method for Air Conditioner using Artificial Neural Networks (신경회로망을 이용한 에어컨의 가변주기제어 방법론 개발)

  • Kim, Hyeong-Jung;Doo, Seog-Bae;Shin, Joong-Rin;Park, Jong-Bae
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.10
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    • pp.399-409
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    • 2006
  • This paper presents a novel method for satisfying the thermal comfort of indoor environment and reducing the summer peak demand power by minimizing the power consumption for an Air-conditioner within a space. Korea Electric Power Corporation (KEPCO) use the fixed duty cycle control method regardless of the indoor thermal environment. However, this method has disadvantages that energy saving depends on the set-point value of the Air-Conditioner and direct load control (DLC) has no net effects on Air-conditioners if the appliance has a lower operating cycle than the fixed duty cycle. In this paper, the variable duty cycle control method is proposed in order to compensate the weakness of conventional fixed duty cycle control method and improve the satisfaction of residents and the reduction of peak demand. The proposed method estimates the predict mean vote (PMV) at the next step with predicted temperature and humidity using the back propagation neural network model. It is possible to reduce the energy consumption by maintaining the Air-conditioner's OFF state when the PMV lies in the thermal comfort range. To verify the effectiveness of the proposed variable duty cycle control method, the case study is performed using the historical data on Sep. 7th, 2001 acquired at a classroom in Seoul and the obtained results are compared with the fixed duty cycle control method.

Estimation of the Noise Caused by the System Air Conditioner and its Improvement (시스템 에어컨에 의한 실내 소음 평가 및 개선 설계)

  • Lee, Jea-Won;Joo, Jae-Man;Oh, Sang-Kyong;Song, Yong-Jae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.862-865
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    • 2004
  • The system air conditioner has an outdoor unit and a number of indoor units, which connected by several long pipes. In comparison with building HAVC system, the system air conditioner doesn't need lots of facilities, such as control of room, cooling tower, etc. At the beginning stage for the market of the system air conditioner, its main application was a school which size is small to use the building HAVC and large to use home air conditioning system, such as PAC (package air conditioner), RAC (room air conditioner). Therefore, because of the advantages of the system air conditioner mentioned above, the market is expanded rapidly. Since it is difficult to evaluate the noise caused by the system air conditioner because it has to be implemented before the finish of construction, the prediction or estimation of the noise by using CAE technology should be very important. In this research, using a commercial code, RAYNOISE, the noise is estimated to improve the design of building.

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Development of Fuzzy Controller for Air Conditioning of Grain Bin (곡물빈용 공기조화장치의 퍼지제어기 개발)

  • 최영수;문대식;정종훈
    • Food Science and Preservation
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    • v.9 no.2
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    • pp.137-143
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    • 2002
  • Temperature and humidity are the most important factors and should be effectively controlled for the cold storage of graius. Fuzzy logic can be easily implemented to the MIMO(Multi-Input Multi-Output) control systems. For the cold storage in grain bin, fuzzy logic was applied to an air conditioning system. The capacities of the grain bin and the air conditioner are 80 tons and 30㎾, respectively. Also, the target values of temperature and relative humidity in outlet duct of the air conditioner were 8$\^{C}$ and 75%, respectively. In order to control temperature and relative humidity of air, a damper in inlet duct was manipulated for temperature control and a heater was used for humidity control. Temperature deviation and change of temperature deviation were used as input parameters for the fuzzy system. Humidity was only considered as a load. The experimental results showed that the controlled temperature of exhausted air was maintained at 8$\pm$2$\^{C}$. Relative humidity of the air was also controlled at the target relative humidity of 50∼80%.

Fuzzy Precompensated PI Controller for Inverter-type Air-Conditioner (인버터형 에어컨의 온도 제어를 위한 퍼지 전단 보상된 PI 제어기)

  • 장보인;이선우;정문종;유장현;김상권;박윤서
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 1997.10a
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    • pp.185-188
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    • 1997
  • In this paper, a fuzzy precompensated PI controller for inverter-type air-conditioner is presented. The presented control scheme is composed of a fuzzy logic precompensator and PI controller, in which two control schemes are serially connected. The rules of the fuzzy precompensator is designed to improve the performance by considering the nonlinear characteristics of a temperature dynamics. The experimental results show the effectiveness of the proposed controller.

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Control of Compressor and Electronic Expansion Valve for a Tandom-type Air-conditioner (텐덤형 냉방시스템의 압축기와 전자팽창밸브 제어)

  • Jung, Nam-Chul;Han, Do-Young
    • Proceedings of the SAREK Conference
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    • 2005.11a
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    • pp.469-473
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    • 2005
  • Capacities of a tandom-type air-conditioner may be modulated by turning on/off multiple compressors and adjusting positions of a electronic expansion valve. In this study. control algorithms for compressors and a electronic expansion valve were developed by using fuzzy’ logics. There algorithms were implemented in a test lab and proved to be effective for the control of indoor air temperature and superheat temperature.

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Power Factor Correction Improvement and Total Harmonic Distortion Reducing for Panel's Air-conditioner (패널용 에어컨의 역률 개선 및 고조파 저감)

  • Park, S.W.;Park, J.W.;Lee, H.W.
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.258-261
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    • 2001
  • High Power factor Active Filter converter is used for Inverter Air conditioner power supply to meet IEC standard. In the active filter topology for power factor, extra switch just control the input current indirectly to meet the IEC standard for reducing the cost and size. In this paper, low cost converter was suggested by simulation using extra switch which auxiliary pulse is inserted and quasi resonant soft switching topology control is adapted for panel's inverter air conditioner converter Inserting auxiliary Pulse method to the extra switch has the benefit of reducing THD by low cost input control circuit. And also quasi resonant soft switching topology can reduce switching loss. So both technical is suitable for Panel's Air conditioner.

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A study on fuzzy control for vehicle air conditioner (자동차용 공기조화기의 퍼지 제어에 관한 연구)

  • 김양영;봉재경;진상호
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.516-519
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    • 1997
  • In this paper, the control of the temperature for the vehicle air conditioner is implemented with the fuzzy controller using a micro controller. The linguistic control rules of the fuzzy controller are separated into two out variables(multi input multi output ; MIMO) : one is those for the blower motor, and the other is those for air mix door. The error in fuzzy controller, the input variable is defined as difference between the reference temperature and the actual temperature in the cabin room. The fuzzy control rules are established from the human operator experience, and based engineering knowledge about the process. The method of the center of gravity is utilized for the defuzzification.

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Source localization of impact noise on an indoor unit of air-conditioner (에어컨 실내기에서 발생하는 충격 소음원의 위치 추정)

  • 최영철;김양한;이종구;김구영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.324-329
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    • 2003
  • An air-conditioner has various noise sources such as cooling fan noise, pumping noise, flow noise and impact noise. Among these, impact noise is the most unpleasant source. This is because the noise is produced in indoor unit of air-conditioner. To control the noise source effectively, first we must identify the noise sources. When we identify impact noise source, the measurement have to be carried out simultaneously. So we use beamforming method that requires less measurement points than intensity method and acoustic holography. The objective of this paper is to estimate the location of impact source. This objective can be achieved by using minimum variance cepstrum that is able to detect impulse embedded in noise. In this study, modified beamforming method based on cepstrum domain is proposed. Then this method applied to air-conditioner noise sources which produce impact noise.

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The Analysis for Thermal Comfort Evaluation during long time operating Air Conditioner (에어컨 장시간 운전시 온열쾌적감 평가에 관한 연구)

  • Kim, Dong-Gyu;Park, Jong-Il;Kim, Se-Hwan
    • KIEAE Journal
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    • v.7 no.5
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    • pp.59-64
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    • 2007
  • Using air conditioner has been increased in home or office buildings in summer. Also various problems related to air conditioning such as disease induction happened by using air conditioner excessively and operating long. Active operation control is needed for occupant's health when air conditioner operates long. We should think ahead to acquire thermal comfort of occupants which represents psychological and physiological reaction for this operation. Research has been progressed to observe activity of autonomic nervous system by trying to quantitate change of thermal comfort. In this study, questions of the subject and change of body's autonomic nervous system were chosen to evaluate thermal comfort during operation of air conditioner for a long time. Electrocardiogram and questions of the subject which is the progress of changing TSV and CSV by occupants indoor were measured when room air conditioner is operated for a long time, and an air-conditioned adaptability of human body was evaluated by acquiring the change rate of autonomic nervous system through analyzing HRV. As a result of the evaluation, change rate of body's autonomic nervous system corresponded to votes of the subject's question generally, but was distinguished from analysis result of warm-cold sensation in a low temperature area.