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Partial Fault Detection of an Air - conditioning System by using a Moving Average Neural Network
Doyoung Han,Hanhong Lee 대한설비공학회 2003 International Journal Of Air-Conditioning and Refr Vol.11 No.3
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 paper, two fault detection methods were considered. One is a generic neural network, and the other is an moving average neural network. In order to compare the performance of fault detection results from these methods, two different types of faults in an air-conditioning system were applied. These are the condenser 30% fouling and the evaporator fan 25% slowdown. Test results showed that the moving average neural network was more effective for the detection of partial faults in the air-conditioning system.
The Optimal Control of an Absorption Air Conditioning System by Using the Steepest Descent Method
Doyoung Han,Jin Kim 대한설비공학회 2004 International Journal Of Air-Conditioning and Refr Vol.12 No.3
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.
Simulation and Analysis of an Automotive Air Conditioning System
Doyoung Han,Youngdoo Cho 대한설비공학회 1996 International Journal Of Air-Conditioning and Refr Vol.4 No.-
Concerning the increase of the dangers on enviromental destruction in a global scale, CFC regulations have finally been carried out and some CFC's are expected to be phased out in the near future. Therfore the research for alternative refrigerants is demanded. The major activities related to alternative refrigerants are focused on two different aspects: The development of mixed refrigerants by using the existing refrigerants, and the development of new HFC refrigerants.<br/> One of the most promising alternative refrigerants for CFC-12 is HFC-134a. HFC-134a has often been used as a replacement of CFC-12 for automotive air-conditioners. However, due to the different thermodynamic properties of HFC-134a, performances of the replaced system are degraded compared with those of the CFC-12 system. Sometimes a complete redesign of the system is required.<br/> To design and analyse a new system, a steady-state simulation program could be used. The outputs from this program can also be used to develop dynamic models, which can predict the dynamic behaviors of the system.<br/> Therefore, the summary of this research is as follows : (1) The various thermodynamic properties of HFC-134a are ana lysed and programmed. (2) The model for serpentine heat exchanger is developed and programmed. (3) These subroutines are integrated to develop an automotive air conditioning system simulation program. (4) This developed system simulation program is verified with the test results, and used for the design and analysis of a new automative air conditioning system.
Simulation Program Verification and Performance Prediction of the Multi - type Heat Pump System
Doyoung Han,Kwanjun Park,Hanhong Lee 대한설비공학회 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.4
The simulation program which can predict major performances of the multi-type heat pump system was developed. In order to verify the simulation program, several experimental tests were performed under various recommended conditions. The experimental results show in good agreement with simulation results. The verified simulation program was used to analyze the system performance. The capacities and the COP's under the various indoor and outdoor conditions were predicted. Therefore, it may be concluded that the system simulation program developed in this study may be effectively used for the system design and the performance prediction of the multi-type heat pump system.
The Optimal Control of an Absorption Air Conditioning System by Using the Steepest Descent Method
Han Doyoung,Kim Jin The Society of Air-Conditioning and Refrigerating 2004 International Journal Of Air-Conditioning and Refr Vol.12 No.3
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.
한도영(Doyoung Han),권형진(Hyungjin Kwon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The control algorithms for the electronic timer, which regulate the fuel injection timing of the Diesel engine fuel injection system, were developed by using the simplified effective dynamic models.<br/> The electronic timer assembly was modeled as the first order with time delay. The various parameters in the model were obtained from experimental data. This model was effectively used for the development of control algorithms of the fuel injection timing system.<br/> The displacement control algorithm and the rpm-disturbance control algorithm were used for the fuel injection timing control. These control algorithms result in the effective and practical control of the fuel injection timing.<br/>
한도영(Doyoung Han),여경목(Kyungmok Yeo) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
Energy savings could be accomplished through the appropriate use of the exhaust heat in a bio-cleanroom. The recovered heat from the exhaust air may be used for the heat pump system in a bio-cleanroom. In this study, the mathematical model of a bio-cleanroom heat pump system was developed. This includes static and dynamic models for a compressor, an electric expansion valve, heat exchangers, and fans. To identify the effectiveness of the mathematical model, the system COP's with respect to speed of a compressor and fans were predicted, and the control of an electric expansion valve was simulated. Test results showed that the mathematical model developed for this study may be effectively used for the development of the control algorithm of a bio-cleanroom heat pump system.