... generation biogas SI engines knocking entropy exergy Nicolaus Otto built the first spark ignition (SI) engine in 1876, operating with the four-stroke cycles: Intake, compression, power, and exhaust [ 1 ]. SI engines are governed by the Otto cycle, where the ideal cycle assumes that all the heat...

... value metric (which may be different for fired and unfired operation or other load points). This is achieved by expressing the HRSG performance guarantee in terms of exergy recovered to steam and plant exergy loss attributable to the HRSG (gas side draft loss). This will be shown, with examples...

...Changcheng Liu; Zhongchang Liu; Jing Tian; Zeyu Yang; Penghui Wang In this study, the impacts of transient time, intake air temperature, coolant temperature, and piecewise transient strategies on energy and exergy terms during typical transient process of automotive diesel engine were researched...

...Rebecca Zarin Pass; Sankaran Ramakrishnan; Chris Edwards We systematically determine the maximally efficient manner of using water and air in a single-cycle steady-flow combustion gas turbine power plant. In doing so, we identify the upper limit to exergy efficiency for dry and wet gas turbine...

...Oskar Thulin; Olivier Petit; Carlos Xisto; Xin Zhao; Tomas Grönstedt An exergy framework was developed taking into consideration a detailed analysis of the heat exchanger (HEX) (intercooler (IC)) component irreversibilities. Moreover, it was further extended to include an adequate formulation...

... of a series of modeling methods applicable to AD and biogas fuel yield, thermodynamic evaluation of cogenerated gas turbine cycles, exergy analysis, and economic evaluation of powerplant operation. The developed method is applied for the techno-economic analysis of an AD plant yielding biogas fuel supplied...

... model using a first law of thermodynamics analysis is utilized as a foundation for a second-law analysis, allowing for a simultaneous energy and exergy analysis of engine combustion from a captured pressure trace. The model calibrates the rate and magnitude of combustion through an Arrhenius equation...

..., with the maximum exergy efficiency and the lowest cost per power (k$/kW) as its objectives. Artificial neural network (ANN) is chosen to accelerate the parameters query process. It is shown that the cycle parameters such as heat source temperature, turbine inlet temperature, cycle pressure ratio, and pinch...

... performance data on optimized intercooled (IC) turbofan engines are provided. Analysis is conducted using an exergy breakdown, i.e., quantifying the losses into a common currency by applying a combined use of the first and second law of thermodynamics. Optimal IC geared turbofan engines for a long range...

... be adjusted by the operator without compromising safety and other operational objectives. The study applies a steady state thermodynamic model with second-law analysis for exploring the entire operational space. A method is presented for revealing correlations between the exergy losses in major system...

... to the compressor technology in order to achieve an optimal performance level for each variant. The thermodynamic results have been cross-checked with a breakdown of the exergy losses in the three variants. The final results for base load operation indicate that the intercooled variant could become the best choice...

... a thermodynamic assessment, using an exergy analysis of a syngas redox (SGR) process for generating electricity. The power island of the proposed process uses syngas produced by coal gasification and is then cleaned through a high-temperature gas desulfurization (HGD) process. Hematite (Fe 2 O 3 ) is used...

... turbine, which produces both electrical and thermal energy (cogeneration). A 20 kWe, microgas turbine is proposed to supply the base load demand of a residential area. The results show that the proposed facility is appropriate when the thermal energy demand is significant. We obtain an exergy efficiency...

...Fontina Petrakopoulou; George Tsatsaronis; Tatiana Morosuk; Anna Carassai Exergy-based analyses are important tools for studying and evaluating energy conversion systems. Conventional exergy-based analyses provide us with important information on the design and operation of a system. However...

... EBSILONPROFESSIONAL . c cost per unit of exergy (€/GJ) C ̇ cost rate associated with an exergy stream ( € / h ) E ̇ exergy rate (MW) f exergoeconomic factor (%) m ̇ mass flow rate (kg/s) p pressure (bar) r...

... conditions using high ash (HA) indigenous coal. A unit size of 800 MWe presently under development in India is considered for energy and exergy analysis of power plants. Commercially established steam turbine parameters are used for the optimization of SupC power plant, whereas advanced steam turbine...

... and as a whole. This paper describes a simple but accurate method to estimate the Rankine bottoming cycle power output directly from the gas turbine exhaust exergy, utilizing the second law of thermodynamics. The classical first law approach, i.e., the heat and mass balance method, requires lengthy calculations...

... energy ratio, second law efficiency, and exergy destruction in each component are examined. Results for gas turbine cycle, cogeneration cycle, and trigeneration cycle are compared. Thermodynamic analysis indicates that maximum exergy is destroyed during the combustion and steam generation process, which...