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Energy and Exergy Analysis and Optimization of a Bi-Fuel Internal Combustion Engine to Waste Heat Recovery Using Two Thermodynamic Cycles

Roeinfard, Nima | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52690 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mousavi, Ali
  7. Abstract:
  8. Rising fuel price, limited fossil fuels, and low fuel conversion efficiency of internal combustion engines are three important factors in the development of alternative methods to reduce fuel consumption and increase engine power. Nowadays, one of the most widely accepted theoretical approaches is using thermodynamic cycles to recover the waste heat from engine exhaust gases. In this study, using the M15GS engine test data, in two performance conditions (full load and part load), two thermodynamic cycles (Organic Rankine Cycle and High-Temperature Kalina Cycle) were designed and first and second thermodynamic laws (energy and exergy) were analyzed. Finally, by sensitivity analysis, the optimum operating temperature and pressure for those cycles were obtained. Then, the recovered power, fuel consumption, and efficiency of ORC and High-Temperature Kalina cycles have been compared under the effect of inlet turbine temperature and pressure of the cycles as two important designing parameters of thermodynamic cycles. The exergy loss-rate in the inlet and outlet flow of the components of the two cycles and the other important parameters in exergy analysis have also been investigated. The results of the studies show a significant difference between the two cycles performance, so that, in all energy and exergy parameters, the High-Temperature Kalina cycle performs much better than the ORC. It is important to note that the High-Temperature Kalina cycle requires more components to implement in the engine which makes problems such as higher cost and locating troubles
  9. Keywords:
  10. Internal Combustion Engines ; Organic Rankine Cycle (ORC) ; Waste Heat Recovery Power Generation (WHRPG)Technology ; First Thermodynamic Law Analysis ; Second Thermodynamic Law Analysis ; High Temperature Kalina Cycle

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