• 제목/요약/키워드: Air conditioning system

검색결과 3,317건 처리시간 0.022초

퍼지로직 과열도 재설정 알고리즘을 사용한 멀티형 냉방시스템의 전자팽창밸브 제어 (The EEV Control of the Multi-type Air-conditioning System by using a Fuzzy Logic Superheat Temperature Setpoint Reset Algorithm)

  • 한도영;이상원
    • 설비공학논문집
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    • 제15권5호
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    • pp.382-388
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    • 2003
  • Refrigerant flow rates of the multi-type air-conditioning system can be regulated by electronic expansion valves (EEV). The performance of the multi-type air-conditioning system may be improved by lowering the superheat at the compressor suction side. In this study, a superheat temperature setpoint reset algorithm was developed by using fuzzy logics, and a PI algorithm was applied to control the superheat temperature near setpoints. Experimental results showed energy savings and stable operations at a multi-type air-conditioning system. Therefore, the developed setpoint reset algorithm may be effectively used for the EEV superheat temperature control of the multi-type air-conditioning system.

물-공기 직접접촉식 공기조화장치의 성능해석 (Performance Analysis of Water/Air Direct Contact Air Conditioning System)

  • 유성연;권화길;김광영
    • 설비공학논문집
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    • 제16권2호
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    • pp.175-183
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    • 2004
  • Performance of the water/air direct contact air conditioning system, in which heat and mass are directly transferred between air and water droplet, is simulated using semi-empirical method. Direct contact system improves transport efficiency compared to conventional indirect contact system. In this study, correlations for h$_{c}$A / c$_{pm}$ which represent the capacity of direct contact system are derived as a function of air and water flowrate from the experimental data. Cooling and heating performance of the water/air direct contact air conditioning system are evaluated using these correlations.ons.

최속 강하법을 이용한 흡수식 냉동공조시스템 제어 (Control of the Absorption Air Conditioning System by Using Steepest Descent Method)

  • 한도영;김진
    • 설비공학논문집
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    • 제15권6호
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    • pp.495-501
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    • 2003
  • Control algorithms for the absorption air conditioning system may be developed by using dynamic models of the system. The simplified effective dynamic models, which can predict the dynamic behaviors of the system, may help to develop effective control algorithms for the system. In this study, control algorithms for an absorption air conditioning system were developed by using a dynamic simulation program. A cooling water inlet temperature control algorithm, a chilled water outlet temperature control algorithm, and a supply air temperature control algorithm, were developed and analyzed. The steepest descent method was used as an optimal algorithm. The simulation results showed energy savings and the effective controls of an absorption air conditioning system.

The Optimal Control of an Absorption Air Conditioning System by Using the Steepest Descent Method

  • Han Doyoung;Kim Jin
    • International Journal of Air-Conditioning and Refrigeration
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    • 제12권3호
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    • pp.123-130
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    • 2004
  • Control algorithms for an absorption air conditioning system may be developed by using dynamic models of the system. The simplified effective dynamic models, which can predict the dynamic behaviors of the system, may help to develop effective control algorithms for the system. In this study, control algorithms for an absorption air conditioning system were developed by using a dynamic simulation program. A cooling water inlet temperature control algorithm, a chilled water outlet temperature control algorithm, and a supply air temperature control algorithm, were developed and analyzed. The steepest descent method was used as an optimal algorithm. Simulation results showed energy savings and the effective controls of an absorption air conditioning system.

멀티형공조시스템의 효과적인 운전을 위한 시스템운전알고리즘 (A System Operating Algorithm for the Effective Operation of a Multi-type Air-conditioning System)

  • 한도영;박관준
    • 설비공학논문집
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    • 제18권7호
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    • pp.587-595
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    • 2006
  • A system operating algorithm was developed for the effective operation of a multi-type air-conditioning system. The system operating algorithm includes control algorithms for a safety mode, an initial operating mode, a stabilization mode, a fault diagnosis mode, an efficiency mode, and a tracking mode. Various tests were performed to show the effectiveness of these algorithms. Tests showed good results for the operation of a multi-type air-conditioning system. Therefore, these algorithms developed for this study may be used for the effective control of a multi-type air-conditioning system.

자동차용 에어컨 시스템의 성능해석을 위한 컴퓨터 시뮬레이션 (Computer simulation for the performance analysis of automobile air conditioning system)

  • 이건호;유정열;정종대;최규환
    • 설비공학논문집
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    • 제10권2호
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    • pp.202-216
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    • 1998
  • A computer simulation for the performance analysis of automobile air conditioning components is carried out for the various operating conditions. The automobile air conditioning system consists of laminated type evaporator, swash plate type compressor, parallel flow type condenser, externally equalized thermostatic expansion valve and receiver drier. The overall heat transfer coefficient and the pressure drop in laminated type evaporator were obtained through experiments. In parallel flow type condenser, the performance analysis computer program using the empirical equation for heat transfer coefficient has been developed and the results are compared with experimental results. A model for matching the performance analysis programs of respective components .of automobile air conditioning system is introduced. Further, the effects of varying condenser size and refrigerant charge on the performance of automobile air conditioning system are discussed clearly.

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공조방식에 따른 사무소 건물의 에너지 성능 평가 (A Simulation Appraisal of Energy Performance in Office Building by Different Types of Air-Conditioning)

  • 최종대;최동석;윤근영
    • 설비공학논문집
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    • 제24권8호
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    • pp.612-620
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    • 2012
  • High economic growth causes increase of the building energy consumption. The energy consumption for HVAC system accounts for 40~50% of the whole building consumption. The trend for building is large-scale and high-rise. Because of the trend, the energy consumption is becoming bigger than before. Nowadays, HVAC system design are recognized as the solution for a energy-saving. This paper is focused on the energy performance evaluation of central air-conditioning system(water-based) and system air-conditioning that were applied to the office building. The systems are modeled and simulated by using EnergyPlus Software 6.0. After the Simulation, annual cooling and heating energy consumption were calculated. It was found that the system air-conditioning can reduce the energy consumption approximately 55.24% annually compared with the central air-conditioning system(water-cooled). In addition, about 46.13% of annual operating costs can be reduced by use of system air-conditioning.

VRF 응용 Hybrid 공조시스템 Case Study (Case Study of Hybrid HVAC system Applied VRF)

  • 김성실;박완규;허인구
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2008년도 하계학술발표대회 논문집
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    • pp.357-362
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    • 2008
  • The present study has been conducted variable refrigerant flow system applied building. Multi air-conditioning system has some benefits : easier building management and maintenance and energy saving. Recently, the system heat pump has been employed in medium-sized and tall buildings. However, the performance data and design method for system heat pump are limited in literature due to complicated system parameters and operating conditions. In the present study, case study of a system heat pump applied various building. The aim of this paper is to application multi air-conditioners and to inform the benefits of multi air-conditioners.

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CFD 해석을 통한 하이브리드 공조시스템의 인체 온열감의 불균일성에 관한 연구 (Study on Non-uniform Thermal Comfort in Hybrid Air-Conditioning System with CFD Analysis)

  • 남유진;성민기;송두삼
    • 설비공학논문집
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    • 제23권3호
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    • pp.216-222
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    • 2011
  • Recently, hybrid air-conditioning system has been proposed and applied to achieve building energy saving. One example is a system combining radiation panel with natural wind-induced cross-ventilation. However, few research works have been conducted on the non-uniformity of thermal comfort in such hybrid air-conditioning system. In this paper, both thermal environment and non-uniform thermal comfort of human thermal model under various air-conditioning system, including hybrid system, were evaluated in a typical office room using coupled simulation of computation fluid dynamics, radiation model and a human thermal model. The non-uniformity of thermal comfort was evaluated from the deviation of surface temperature of human thermal model. Flow fields and temperature distribution in each case were represented.

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

  • 이윤종;김찬중;문제명;김철우;서형준;김경록;신행조;홍희기
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2007년도 동계학술발표대회 논문집
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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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