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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 doi:10.1088/1757-899X/52/4/042018 Parametric and exergetic analysis of a two-stage transcritical combined organic Rankine cycle used for multiple grades waste heat recovery of diesel engine H Tian1, J Zhang2, X F Xu1, G Q Shu1 and H Q Wei 1 State key laboratory of engines, Tianjin University, No.92 Weijin Road, Nankai Region, Tianjin 300072, China 2 Key lab of efficient utilization of low and medium grade energy, ministry of education of China, Tianjin University E-mail: thtju@tju.edu.cn/sgq@tju.edu.cn Abstract. Diesel engine has multiple grades of waste heat with different ratios of combustion heat, exhaust is 400°C with the ratio of 21% and coolant is 90°C with 19%. Few previous publications investigate the recovery of multiple grades waste heat together. In this paper, a two-stage transcritical combined organic rankine cycle (CORC) is presented and analyzed. In the combined system, the high and low temperature stages transcritical cycle recover the high grades waste heat, and medium to low grades waste heat respectively, and being combined efficiently. Meanwhile, the suitable working fluids for high stage are chosen and analyzed. The cycle parameters, including thermal efficiency (ηth), net power output (Pnet), energy efficiency (ηexg) and global thermal efficiency of DE-CORC(ηglo) have also been analyzed and optimized. The results indicate that this combined system could recover all the waste heat with a high recovery ratio (above 90%) and obtain a maximum power output of 37kW for a DE of 243kW. The global thermal efficiency of DE-CORC can get a max value of 46.2% compared with 40% for single DE. The results also indicate that all the energy conversion process have a high exergy efficiency. 1. Introduction In China, Diesel Engine (DE) has consumed over 66 percent of overall fuel consumption. Since it is difficult for the maximum efficiency of ICE to be higher than 42% [1], large amount of fuel energy is rejected from the engine to the surroundings as waste heat in several forms. It was predicted by Vazaquez et al. [2] that if only 6% of the heat contained in the exhaust gases were converted to electric power, this would mean reduction of fuel consumption by 10%. Diesel engine waste energy shows diverse characteristics from low grade to high grade, with different characteristics of energy balance distribution. In order to recover multiple grades waste heat, the traditional Organic Rankine Cycle is mostly studied currently, in which exhaust is used as the main heat source and cooling water is used for preheating. Rody EI Chammas et al. [2] used a traditional ORC to recycle waste heat of exhaust and cooling water of a hybrid engine, the results showed that the waste heat of cooling water recovered accounted for 30%-50% of the total amount of the recovered water heat, while this part heat accounted for only 10% of the available heat of cooling water. Diego A. Arias [3], Iacopo Vaja [4], Jacek Kalina [5] also established a similar system models, and the results Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd 1PDF 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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