• Title/Summary/Keyword: Air-Conditioning

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Evaluation of Indoor Air Environment by Changing Diffuser Location and Air Temperature with Under Floor Air Conditioning System (바닥취출 및 흡입시스템 공조방식에서 취출조건 변경시 실내공기환경 평가)

  • Kim Se-hwan;Park Jong-Il
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.5
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    • pp.397-403
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    • 2005
  • The thermal comfort of occupants is directly related to several environmental factors such as velocity of air flow, turbulence intensity and temperature distribution of indoor air. The purpose of this study is to evaluate the indoor air flow and temperature distribution in office area using under-floor air-conditioning system (UFAC System) based on the results from physical measurements and to perform a Computer Fluid Dynamics (CFD) under the same condition of inlet and outlet as field measurement. The results from the CFD simulation are similar to those from the field measurement. The results show that UFAC system is provide proper indoor condition for occupants.

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

  • Kim, Seong-Sil;Park, Wan-Kyu;Hur, Inn-Ju
    • Proceedings of the SAREK Conference
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    • 2008.06a
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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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An Experimental Study on the Performance of Heat Pump Air Conditioner according to Frequency Modulator for Cooling and Heating (주파수변조장치를 이용한 열펌프식 공기조화기의 냉방-난방에 관한 실험적 연구)

  • Lee, Dae Woo;Cho, Jin Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.1 no.3
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    • pp.203-209
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    • 1989
  • This paper is an experimental study on the pleasantly suitable cool/warm air conditioning system in order to minimize the energy consumption by attaching the electronic-controlled device to the heat pump air conditioning system.While the cool/warm air conditioning, the air temperatures in the entrance and exit of the indoor heat exchangers should be checked and when the surface of heat exchanger is reached to the dew point temperature, a speed of the compressor is to be automatically controlled by anti-dewing system in order to minimize the energy consumption.At the result of this study, the energy consuming amount is saved about 5% more than that of the conventional air conditioning system by prevent unnecessary dew forming.

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Partial Fault Detection of Air-conditioning System by Neural Network Algorithm using Data Preprocessing Method (데이터 전처리기법을 적용한 신경망 알고리즘의 냉방기 부분고장 검출)

  • 한도영;이한홍;윤태훈
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.7
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    • pp.560-566
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    • 2002
  • The fault detection and diagnosis technology may be applied in order to decrease the energy consumption and the maintenance cost of the air-conditioning system. In this study, two different types of faults in the air-conditioning system, such as the condenser fouling and the evaporator fan slowdown, were considered. The neural network algorithm combined with data preprocessor was developed and applied to detect the faults of the real system. Test results show that this method is very effective to detect the faults in the air-conditioning system. Therefore, this developed method can be used for the development of the air-conditioner fault detection system.

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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