What Is Isentropic Efficiency?
Quick Answer
Isentropic efficiency is a measure of the energy loss in a system. Since an isentropic process is an idealized process that occurs without entropy change, isentropic efficiency is often used to compare real-world losses to an idealized process.
Continue ReadingFull Answer
The real-world efficiency of a device is always less than the isentropic efficiency. Examples of devices for which isentropic efficiencies are frequently calculated include turbines, compressors, nozzles and pumps.
Isentropic turbine efficiency is the ratio of actual work to the maximum theoretical work per mass flow. For compressors, the isentropic efficiency is the ratio of minimum theoretical work going into the compressor to the actual work per mass flow.
Typical isentropic turbine and compressor efficiencies range from 70 to 90 percent, depending on design and size. Nozzle isentropic efficiency is typically over 90 percent and can reach over 95 percent.
Many devices involve a number of individual processes, each of which are often analyzed in terms of isentropic efficiency. For example, a number of different isentropic efficiencies make up the efficiency of the cycle of a combustion engine, such as an internal combustion piston engine or a gas turbine engine. These individual efficiencies include the compression and expansion processes, as well as the inlet and exhaust flow through the ports or nozzles. By increasing the isentropic efficiency of each of these processes, designers seek to improve the overall efficiency of the engine.
Learn more about ThermodynamicsRelated Questions
-
Q:
What Is "work Output"?
A: Work output includes measures of the quality and efficiency of production by companies, people and machines. Output is often compared to input, or the cost... Full Answer >Filed Under: -
Q:
What Is Specific Heat Capacity?
A: Specific heat capacity is a measure of how much energy must be added to a specific amount of a substance in order to raise its temperature by a single degr... Full Answer >Filed Under: -
Q:
How Do You Calculate Adiabatic Flame Temperature?
A: To calculate the adiabatic flame temperature of a substance, measure the substance's molar mass and its initial temperature. Calculate the heat of the reac... Full Answer >Filed Under: -
Q:
What Causes Thermal Energy to Change?
A: Temperature causes changes in the amounts of thermal energy held by a substance or system. The higher the temperature, the higher the amount of thermal ene... Full Answer >Filed Under:
