fundamentals of engineering thermodynamics pdf 6th edition

In this work, the original pseudo-supermesh strategy is enhanced by introducing the dual-boundary concept to model the valve opening/closing events to increase the accuracy and simplicity of the simulation procedure. The engine domain is divided into regions according to each moving zone, and these are coupled using a pseudo-supermesh interface presented in a previous work by the authors. To do this, experimental data obtained on a single-cylinder engine are used to validate the proposed computational approach. The present paper describes and validates an efficient CFD implementation to replicate the working fluid-dynamics of a real four-stroke internal combustion engine. The authors suggest for future works that it would be interesting to perform a life cycle assessment (LCA) and exergoeconomic analysis to evaluate the environmental and economic impacts associated with biogas production from the anaerobic digestion of sugarcane vinasse. The heat exchanger showed the highest exergy efficiency (99.95%), with only 5.77 kW of exergy being destroyed. The results show that the exergy destroyed in the CSTR biodigester was 1338.9 kW, accounting for 57.2% of the overall exergy destruction in the process. The analysis was performed through mass, energy, and exergy balances using literature data and computer simulation and considering the use of a continuous stirred tank reactor. In this study, an exergy analysis was performed to determine the exergetic efficiency and exergy destruction in the biogas process produced from the anaerobic digestion of vinasse. Various methodologies are used to support the decision on process parameters and operating conditions to find the most effective and sustainable ones. However, it is still necessary to improve the technology associated with its production, adapting it to an efficient, safe, and competitive scale.

Biogas is a mixture of gases, primarily consisting of methane, carbon dioxide, and hydrogen sulfide, that can be used for electrical and thermal energy generation or as fuel. Anaerobic digestion is a promising process for treating organic waste and producing biogas. The use of agro-industrial and urban organic waste to produce energy seems to be one of the most attractive options for the future of energy supply.

Fundamentals of engineering thermodynamics pdf 6th edition