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대형 가솔린 엔진의 폐열 회수 장치인 슈퍼히터의 최적 위치선정을 위한 시뮬레이션 연구
김세린(Se Lin Kim),최경욱(Kyung Wook Choi),이기형(Ki Hyung Lee),김기범(Ki Bum Kim) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.2
최근 자동차 엔지니어들은 자동차 엔진의 열효율을 향상시키기 위한 수단으로 폐열 회수 기술에 많은 관심을 기울이고 있다. 배기량이 큰 가솔린 엔진은 대체로 V형인데, 열 회수를 위해 두 개의 슈퍼히터를 각각의 배기 다기관 가까이에 설치하는 것은 비용 면에서 효율적이지 않다. 하나의 슈퍼히터를 한쪽 배기 다기관에 최대한 가깝게 부착하면 좀 더 높은 열교환 효율을 얻을 수 있으나 폐열회수를 위한 배기가스의 유량은 절반이 된다. 반면에, 배기가스의 유량을 전부 이용하기 위하여 두 배기관이 합류된 지점에 슈퍼히터를 설치하면 배기가스의 온도는 많이 감소된다. 이 사실을 바탕으로 슈퍼히터의 최적 위치를 조사하기 위하여 상용프로그램인 AMESim을 이용해 해석을 수행하였다. 이 때, 배기가스 유량 중 절반만을 사용하더라도 슈퍼히터를 배기 다기관과 최대한 가까이 부착하는 것이 엔진의 배기가스로부터 3.8 kW의 열을 더 회수할 수 있는 것으로 나타났다. 이 결과를 바탕으로 최적의 폐열 회수 모델을 도출하고 제안하였다. Recently, automotive engineers have paid much attention to waste heat recovery technology as a possible means to improve the thermal efficiency of an automotive engine. A large displacement gasoline engine is generally a V-type engine. It is not cost effective to install two superheaters at each exhaust manifold for the heat recovery purposes. A single superheater could be installed as close to the exhaust manifold as possible for the higher recovery efficiency; however, only half of exhaust gas can be used for heat recovery. On the contrary, the exhaust temperature is decreased for the case where the superheater is installed at a junction of two exhaust tail pipes. With the fact in mind, the optimum position of a single superheater was investigated using simulation models developed from a commercial software package (i.e. AMESim). It was found that installing the superheater near the exhaust manifold could recover 3.8 kW more from the engine exhaust despite utilizing only half of the exhaust mass flow. Based on this result, the optimum layout of an automotive waste heat recovery system was developed and proposed in this paper.
성규식(Gyu-Sik Sung),황은빛(Eunbit Hwang),박주헌(Juheon Park),최종성(Jongseong Choi),신기열(Ki-Yeol Shin),배상수(Sang-Su Bae),조경철(Kyung-Chul Cho),권오대(Oh-Dae Kwon) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
In this study, optimum capacity design of heat exchangers in a waste heat recovery system(WHRS) that recovers a large amount of heat energy from high-temperature exhaust gas which was supplied from a power generation gas engine using biogas produced from organic waste in an industrial complex were performed. The type and size of waste heat recovery system components suitable for engine power capacity according to biogas production volume were designed, and energy recovery efficiency was analyzed. The waste heat recovery system consists of a smoke tube boiler that produces 5 bar pressure and 161°C superheated steam from exhaust gas as heat source, and two economizers that produce preheating of supply water and hot water. Two different gas engine capacities as 100kW and 250kW were analyzed to product a target amount of superheated steam and hot water to maximize efficiency of waste heat recovery system. From the result of heat exchanger performance analysis, the optimum value of heat exchanger capacity ratio was founded as similar range as 0.43 ~ 0.46 even two different capacity of engines.
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.
유기 랜킨 사이클을 이용한 선박 주기관 폐열 회수 시스템의 열역학적 분석
진정근(Jungkun Jin),이호기(Hoki Lee),박건일(Gunil Park),최재웅(Jaewoong Choi) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.7
유기 랜킨 사이클(ORC)을 이용한 선박 주기관 폐열 회수 시스템의 열역학적 분석을 수행하고 적용 가능성 및 효과를 검토하였다. 이론 해석에서는 ORC 와 ORC 에 열을 전달하기 위한 열전달 루프, 냉각수 공급 펌프를 모두 고려하여 전체 효율을 예측하였다. ORC 사이클의 성능은 증발기와 응축기의 특성과 열전달 루프의 온도 조건을 달리하여 평가되었으며 그 특성을 사이클 효율과 시스템 효율 관점에서 비교하였다. 수에즈막스 유조선에 대하여 ORC 사이클은 250℃ 이하의 폐열 조건에 대하여 약 10%정도의 열효율을 보였다. ORC 이용하여 엔진 폐열로부터 주기관 출력의 3~4%에 해당하는 전력을 생산할 수 있으며 수에즈막스 유조선에 적용 시, 정상 운항시 필요한 전력의 59~69%를 ORC 생산 전력으로 대체하여 운항 중 연료 소모량을 절감시킬 수 있는 것으로 나타났다. A thermodynamic analysis and a feasibility study on the organic Rankine cycle (ORC) as a waste heat recovery system for a marine diesel engine were carried out. The ORC and its combined cycle with the engine were simulated, and its performance was estimated theoretically using R245fa. A parametric study on the performance of the ORC system was carried out under different temperature conditions of the heat transfer loop and specification of the heat exchanger. According to the thermodynamic analysis, ~10% of the thermal efficiency of the cycle was able to be realized with the low temperature heat source below 250°C. The electric power output of the ORC was estimated to be about 4% of the mechanical power output of the engine, considering additional pumps for cooling water and circulation of the heat transfer medium. According to the present study, the electric power generated by the ORC is about 59%?69% of the required power, and it is possible to reduce the fuel consumption under normal seagoing conditions.
엔진 폐열 회수를 위한 랭킨 스팀 사이클용 열교환기의 유동 및 구조적 특성 연구
정장호(Jangho Jung),김구성(Kusung Kim),이성욱(Seangwock Lee),허형석(Hyungseok Heo),이홍열(Hongyeol Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop is used to recover waste heat from exhaust gas and a low temperature loop is used to recover waste heat from cold engine coolant. In this paper has dealt with a layout of low temperature loop system, the review of the factors through numerical analysis. According to the result of analysis, the designed heat exchanger, LT Boiler has low equivalent stress than ultimate stress of the material. And comparing with flow analysis results, LT Boiler is safe to operation.
이헌균(Heonkyun Lee),허형석(Hyungseok Heo),황재순(Jaesoon Hwang),배석정(Sukjung Bae),정재우(Jaewoo Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, improvement of vehicle economy at low temperature operating condition has become an issue. Utilizing waste heat of exhaust gas is effective to improve the overall vehicle economy. The exhaust heat recovery system transfers the thermal energy from “hot” exhaust gas to “cold” engine coolant, and heated coolant reduces engine warm-up time. Therefore, it is possible that vehicle economy is enhanced by reduced engine fiction loss. The current work evaluated the effect of the exhaust heat recovery system applied to the PHEV engine. Results showed an improvement of warm-up time for the engine thermal management system by use of the heat recovery system. Moreover, the warm-up characteristics were analyzed according to the variation of the thermal management system layout.
배석정(Sukjung Bae),허형석(Hyungseok Heo),이동혁(Donghyuk Lee),이헌균(Heonkyun Lee),강태구(Taegu Kang),김태진(Taejin Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A waste heat recovery system with Rankine steam cycles for improving the fuel efficiency of gasoline automobiles has been investigated. The system recovers waste heat from engine exhaust gas. The design point and the target heat recovery of an evaporator, which is a core part of the system, have been presented. A prototype evaporator was evaluated by an experiment. The inlet temperature condition of the boiler working fluid was set to a degree of subcool of 5 ℃. The exit condition was the degree of superheat, which was set at 5℃. Heat recovery and pressure drops of fluids were evaluated for varying flow rates and inlet temperatures of the exhaust gas. A prototype boiler was also evaluated in order to set an effective design for the layout of heat recovery system.