Is thermal efficiency the same as efficiency?
Thermal efficiency relates to processes where the input is thermal energy as in a fired power plant, a internal combustion engine or solar energy systems. Overall efficiency looks at entire systems from the initial input to the final output. The input does not necessarily have to be thermal in nature.
What are the factors that affect the thermal efficiency of Otto cycle?
1. an ideal thermodynamic combustion cycle, as follows: a compression at constant entropy; a constant-volume heat transfer to the system; an expansion at constant entropy; and a constant-volume heat transfer from the system. The thermal efficiency of the ideal Otto cycle increases with an increasing compression ratio.
What is thermal efficiency of Otto cycle?
About 70-75% is rejected as waste heat without being converted into useful work, i.e. work delivered to wheels. When we rewrite the expression for thermal efficiency using the compression ratio, we conclude the air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = cp/cv.
How does the thermal efficiency of an ideal Otto cycle change with the specific heat ratio of the working fluid?
How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid? It increases with both of them. The fuel is injected into the cylinder in both engines, but it is ignited with a spark plug in gasoline engines.
What is an ideal Otto cycle?
An Otto cycle is an ideal thermodynamic cycle that describes the function of a spark ignition piston engine. The idea of Otto cycle was first proposed by Nicolas Otto back then in 1876. It is the thermodynamic cycle most commonly found in automobile engines.
What is cold air standard Otto cycle?
A cold air-standard Otto cycle has a compression ratio of 8. At the beginning of the. compression process, air is at 100 kPa and 17 °C, and 800 kJ/kg of heat is transferred to.
What is Otto cycle?
An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine.