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최두열(Duyoul Choi),정한식(Hanshik Chung),정효민(Hyomin Chung),최순호(Soonho Choi),김경석(Kyeongseok Kim),김필환(Pilhwan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This study was performed to evaluate the theoretical analysis of the mass balance and heat balance, a single effect desalination process by mechanical vapor compression (MVC), and a set of correlations for evaluation of the thermo-physical property of water. The analysis focuses on prediction of specific power consumption for the vapor compression of the desalination process by mechanical vapor compression. A present study was performed the vapor compression ratio 1.24, the suction steam pressure 31.2 kPa (saturation temperature 343.15 K), and discharge pressure 38.6 kPa (saturation temperature 348.15 K). Finally, comparison of the specific energy consumption of the MVC desalination process and the 5 effect thermal vapor compression (MED-TVC) desalination process was evaluated. The choice between the two systems should be done when plant operating parameter and operating cost is considered
최두열(Duyoul Choi),김철민(Chulmin Kim),최이철(Yicheol Choi),이원석(Wonsuk Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
There are some sensitive problems with developing Fuel Cell Vehicle. One of them is cooling system. As a lot of researchers already know, the coolant temperature of Fuel Cell Vehicle is lower than Internal Combustion Engine Vehicle. For this reason, cooling system of Fuel Cell Vehicle should have high flow water pump, extensive radiator and high power fan motor to maintain constant temperature level. Among these units, we have focused on high power fan motor which is operated by high voltage. As a result, we had developed HV BLDC fan motor using hall sensor. One step further, this paper presents the sensorless control on HV BLDC fan motor. Through this study, we have got equivalent performance compared to HV sensor type BLDC fan motor.
최두열(Duyoul Choi),김철민(Chulmin Kim),이원석(Wonsuk Lee),최재식(Jaesik Choi),강수연(Sooyeon Kang) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The main objective of this paper is to develop an integrated high-voltage PTC heater and to validate heating performance of PTC heater for fuel efficiency of PHEV vehicle. In this paper, controller of high-voltage PTC heater has been integrated and this PTC heater is able to control independent temperature between driver side and passage side. Test result shows that the heating power consumption of independent control PTC heater is reduced about 40% to compare to the heating power consumption of total control PTC heater.
최두열(Duyoul Choi),김철민(Chulmin Kim),이원석(Wonsuk Lee),원종필(Jongphil Won),이호성(Hoseong Lee),전한별(Hanbyoel Jeon) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The main objective of this study is to improve efficiency of heat pump system on battery electric vehicle under low temperature. In general, the operating temperature of automobile heat pump is lower than that of housewares. For this reason, it is necessary that high efficient heat pump system should be developed in other approach for EV. Because refrigerant of R134a has high specific volume at low temperature, flow rate of refrigerant is reduced in a system. In order to resolve this problem, the vapor injection technologies are recommended in heat pump system. In this study, the primary components of heat pump system have been developed to organize the vapor injection heat pump system. The compressor power consumption was measured and the analysis of the heating performance & COP was conducted.
전기자동차 주행거리 향상을 위한 바이오에탄올 연소식히터를 적용한 난방시스템 개발
최두열(Duyoul Choi),이원석(Wonsuk Lee),김철민(Chulmin Kim),최이철(Yicheol Choi),심홍록(Hongrok Shim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The main objective of this paper is to develop heating system on battery electric vehicle for range enhancement. In general, PTC heater is widely used on battery electric vehicle. However, according to recent research, the range is reduced by more than 50% due to the amount of power consumption of PTC heater on battery electric vehicle. In order to resolve this problem, additional heating system was adopted in this study. The heating performance, power consumption and range enhancement were analyzed on battery electric vehicle by using bio-ethanol fire-operating heater. This experimental work has done at a low temperature in the wind tunnel. This work gets results that the heating performance is satisfied with target temperature, power consumption is saving 60% and the range is extended up to 53% compared to operating only PTC heater.
판형 열교환기를 적용한 조수기의 성능 및 유동분포에 대한 연구
김진화(Zhenhua Jin),최두열(Duyoul Choi),최순호(Soonho Choi),정한식(Hanshik Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Plate Heat Exchanger (PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performance, extremely compact design and flexibility of extend or modify to suit changed duty. In present work, PHE aimed apply in the fresh water generator which installed in ship to desalinate seawater to fresh water use heat from engines. The experiment is proceeded to investigate the heat transfer between cold and hot fluid stream at different flow rate and supply temperature of hot fluid. Another target is the generated fresh water as outcome of the system. PHE is an important part of a condensing or evaporating system. One of common assumptions in basic heat exchanger design theory is that fluid is to be distributed uniformly at the inlet of each fluid side and throughout the core. However, in practice, flow mal-distribution is more common and can significantly reduce the heat exchanger performance. The main objective of this paper is discussing main conception of plate heat exchanger and applied in vacuum evaporator for product fresh water.