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엔진 폐열 회수 시스템 저온 응축기의 설계 및 성능 평가
배석정(Sukjung Bae),허형석(Hyungseok Heo),박정상(Jeongsang Park),이홍열(Hongyeol Lee),김찬중(Charnjung Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A waste heat recovery system is consist of dual loop system in which water and refrigerant are used in the high temperature loop and in the low temperature loop, respectively. In the high temperature loop, power is produced by the recovery of waste heat, and the remaining waste heat is delivered to the low temperature loop through the high temperature condenser. In the low temperature loop, after the additional power generates by the use of waste heat from the high temperature loop and an engine coolant, the rest of heat is discharged to outside. In this study, analysis and evaluation were performed for the design of heat transfer of the low temperature condenser. The analysis program was developed in order to simulate the process of heat transfer and the phase change when the geometric parameters and operating conditions of low temperature condenser are entered. By the result of the analysis, the heat transfer performance was predicted in the 2-pass model and it was compared with the experiments. The heat dissipation performance at design point coincides within 2%, but within an average error of 12% in the whole test conditions. In addition, the performance comparison of 4-pass model and 2-pass model is carried out.
랭킨 사이클용 엔진 냉각수 폐열 회수 열교환기의 성능 평가
이동혁(Donghyuk Lee),허형석(Hyungseok Heo),배석정(Sukjung Bae),강태구(Taegu Kang),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The application of the waste heat recovery system to recover waste heat from the vehicle engine exhaust gas has been a effective portion of enormous technical efforts to cope with the environmental regulations that have been carried out. The main objective of this paper is to investigate the performance characteristics of the LT loop boiler of the rankine cycle for the engines waste heat recovery system. The experimental results demonstrate that the waste heat recovery system is one of the most effective technology to enhance the fuel consumption efficiency. On the boiler component performance test, we could set the boiler inlet condition at the pump outlet condition with the sub-cool temperature of 5℃and the boiler outlet condition with the super-heat temperature of 5℃, respectively, bringing on the engine coolant inlet temperature and flow rate. The evaluation of the heat dissipation and the pressure drop on working fluid were experimented on the boiler inlet pressure of 32.8 bar, at the engine coolant temperature of 100℃, 110℃and the engine coolant flow rate of 10, 15, 20, 25, 30, 40 LPM.
배기 폐열 회수를 위한 Chevron Plate Type Condenser의 성능평가
강태구(Taegu Kang),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),이헌균(Heonkyun Lee),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A waste heat recovery system with Rankine steam cycles for improving the fuel efficiency of gasoline automobiles has been investigated. HT(high temperature) loop and LT(low temperature) loop of the system recover waste heat from exhaust gas and coolant of engine, respectively. High temperature condenser works as a condenser in HT loop, and it works as a superheater exchanging waste heat with LT loop at the same time. In this paper, the performance of the high temperature condenser was evaluated in order to set an effective design for the layout of heat recovery system.
엔진 냉각수 폐열 회수를 위한 ORC 시스템 및 폐열 회수 열교환기 설계
배석정(Sukjung Bae),허형석(Hyungseok Heo),황재순(Jaesoon Hwang),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of a gasoline vehicle has been established. A high temperature loop system is used to recover waste heat from exhaust gas, and a low temperature loop system is used for heat recovery from the relatively cold engine coolant. This paper has dealt with a layout of an low temperature loop system, a review of the working fluids, and the design of the cycle. R1234yf has been chosen as the working fluid. The design point and the target heat recovery of the LT boiler, a core heat exchanger for the organic Rankine cycle, has been presented and analytically investigated. Considering the characteristics of the cycle, the basic concept of the heat exchanger has been determined to be a shell-and-tube type counter flow heat exchanger. The performance characteristics for various design parameters were investigated.
엔진 폐열 회수 시스템 저온 응축기의 성능 향상을 위한 해석적 접근
배석정(Sukjung Bae),허형석(Hyungseok Heo),조성일(Seongil Jo),박정상(Jeongsang Park),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The optimum design of the low-temperature condenser of a dual-loop waste heat recovery system with Rankine steam cycles for improving the fuel efficiency of gasoline automobiles has been investigated. The waste heat recovery system consists of a high-temperature (HT) loop in which water as the HT working fluid recovers waste heat only from the exhaust gas of about 700℃ and a low-temperature (LT) loop in which a refrigerant as the LT working fluid recovers heat dissipation from the HT loop, and waste heat from the engine coolant of relatively low temperature. The low temperature condenser plays a role to dissipate heat from the system by condensing the low temperature loop working fluid sufficiently. However, the refrigerant has low evaporation temperature enough to recover the waste from engine coolant but has small saturation enthalpy so that excessive mass flow rate of the LT working fluid, e.g., over 150 g/s, causes the enormously large pressure drop of the working fluid to maintain the heat dissipation performance of more than 20 kW. This paper has dealt with the scheme to design the low temperature condenser that has reduced pressure drop while ensuring the required thermal performance from the waste heat recovery system. For the purpose of the performance predictions and the parametric study for the LT condenser, we have developed a 1-dimensional user-friendly performance prediction program that calculates feasibly the phase change of the working fluid in the tubes. Sustaining the scale of the existing vehicle refrigerant condenser, the number of pass, arrangement of the tubes of each pass and the structural design to enhance the flow uniformity through all the tubes of the multi-flow type low temperature condenser were analytically investigated.