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6th International Conference on Pumps and Fans with Compressors and Wind Turbines IOP Publishing IOP Conf. Series: Materials Science and Engineering 52 (2013) 042018 6. Conclusions In this paper, a two-stage transcritical combined organic rankine cycle(CORC) is presented and also be analyzed and optimized. Some conclusions can be obtained. 1) There exists an optimal maximum pressure of high-temperature stage to obtain the highest ηglo. Various working fluids have the variable optimal maximum pressure, such as 12MPa of Siloxane1, 5.7MPa of Siloxane2 and 7.5MPa of Siloxane3. 2) The CORC system could recover the multiple grades waste heat fully, about 95.9% of EGR waste heat, 97.5% of exhaust waste heat, 78.9% of CAC waste heat and 100% of coolant waste heat. 3) The global thermal efficiency of DE-CORC combined systems (ηglo) can get a value of 45.1%- 46.2% assuming 40% thermal efficiency of the DE system without CORC bottoming system. Acknowledgement This work was supported by a grant from the National Natural Science Foundation of China (NO.51206117) and the National Basic Research Program of China (973 Program) (No. 2011CB707201). References doi:10.1088/1757-899X/52/4/042018 [1] Teng H, Regner G and Cowland C 2007 Waste heat recovery of heavy-duty diesel engines by organic Rankine cycle Part II: working fluids for WHR-ORC SAE paper 01 543 [2] Vazaquez J, Zanz-Bobi M A, Palacios R, Arenas A 2002 State of the art of thermoelectric generators based on heat recovered from the exhaust gases of automobiles Proceedings of 7th European workshop on thermoelectrics(Pamplona, Spain, Octorber 2002) [3] Rody E C and Denis C 2005 Combined cycle for hybrid vehicles SAE paper 01 1171. [4] [5] [6] Kalina J 2011 Applied Thermal Engineering 31 2829-40 [7] Teng H, Regner G and Cowland C 2006 Achieving high engine efficiency for heavy-duty diesel engines by waste heat recovery using supercritical organic-fluid rankine cycle SAE Paper 01 3522 [8] Regner G, Teng H and Cowland C 2006 A quantum leap for heavy-duty truck engine efficiency-hybrid power system of diesel and WHR-ORC engines. The 12th Diesel Engine- Efficiency and Emissions Research Conference(Detroit, Michigan, 20-24 August 2006) [9] Lai N A, Wendland M and Fischer J 2011 Energy 36(1) 199-211. Figure 7. Variation of global thermal efficiency (ηglo) with P max h Arias D A, Shedd, T A and Jester R K 2006 Theoretical analysis of waste heat recovery from an internal combustion engine in a hybrid vehicle SAE paper 01 1605 Vaja I and Gambarotta A 2010 Internal combustion engine (ICE) bottoming with organic Rankine cycles (ORCs). Energy 35(2) 1084-93 7PDF Image | Parametric and exergetic analysis of a two-stage transcritical combined organic Rankine cycle used for multiple grades waste heat recovery of diesel engine
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