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different. Fig. 7 is the variation of the OEDWF under different evaporating pressures. With increase of evaporating pressure, OEDWF increases gradually. When evaporating pressure being 3MPa, OEDWF is the maximum value, roughly 10.77kJ. 2200r/min and engine torque being 1200N·m, WHRE hits the maximum value, roundly 7.729%. This primarily influenced by two factors: engine exhaust energy and the net power output of the ORC system. Fig. 9. Improvement ratio of BSFC for the engine. Fig. 10. Variation of WHRE under engine different working conditions. V. CONCLUSIONS This paper is summarized as the following three points: 1) With the increase of the evaporating pressure, the net power output of the ORC system increase, while the mass flux of the working fluids decreases gradually. This explains, with the increase of evaporating pressure, OEDWF increase gradually, when evaporating pressure being 3MPa, OEDWF hits the maximum value, roundly 10.77kJ. 2) Generally, the exhaust energy of the diesel engine varies with time, to highly effectively recover and utilize the exhaust energy under the whole diesel energy operating range, should regulate the mass flux of the working fluids in line with the varying of the exhaust energy. 3) When engine speed being 2200r/min and engine speed being 1200N·m, the net power output of the ORC system, engine thermal efficiency increasing ratio (ETEIR), waste heat recovery efficiency (WHRE) and the Improvement ratio of BSFC all hit the maximum value, being 22.41kW, 8.085%, 7.729%, 7.423% respectively. ACKNOWLEDGMENTS This work was sponsored by the National Natural Science Foundation of China (Grant No. 51376011), Scientific Fig. 7. Variation of the OEDWF under different evaporating pressures. It can be concluded from the analysis above, when evaporating pressure being 3MPa, the ORC system has the optimal performance. In the following study, we only discuss, when evaporating pressure being 3MPa, the running performance of the combined system. In order to evaluate the improve degree of the engine thermal efficiency after the engine is coupled with a set of ORC system, we propose a indicator called engine thermal efficiency increasing ratio (ETEIR). Fig. 8 is the variation of the ETEIR under engine whole operating range. It can be seen from the figure, the variation of ETEIR is relatively complex, when engine speed being 2200r/min and torque being 1200N·m, ETEIR has the maximum value, roundly 8.085%. Journal of Clean Energy Technologies, Vol. 3, No. 5, September 2015 Fig. 8. Variation of the ETEIR under engine whole operating range. Fig. 9 shows the improvement ratio of the engine BSFC after the engine is coupled with the ORC system. When engine runs at high speed and high torque condition, with increase of engine speed and torque, the improvement ratio of the BSFC increase gradually. When engine speed being 2200r/min and engine torque being 1200N·m, the improvement ratio of the BSFC hits the maximum value, roughly 7.423%. This is mainly affected by the exhaust temperature, the net power output of the ORC system and the engine power output as well. To evaluate the extent of recovering and utilizing the energy exhaust energy, we propose an indicator called waste heat recovery efficiency (WHRE). Fig. 10 is the variation of WHRE under engine different working conditions. WHRE increase with the engine torque. When engine speed being 343PDF Image | Performance Analysis of the Organic Rankine Cycle (ORC) System under Engine Various Operating Conditions
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