Cute Define Indicated Thermal Efficiency
Indicated thermal efficiency is the ratio of indicated power ip and energy in fuel per second.
Define indicated thermal efficiency. The term efficiency is a dimensionless measure sometimes quoted in percent and strictly heat rate is dimensionless as well but often written as energy per energy in relevant units. The thermal efficiency ηth represents the fraction of heat qh that is converted to work. The thermal efficiency is represented by the symbol and can be calculated using the equation. The thermal efficiency expresses the fraction of heat that becomes useful work.
Is is a ratio of heat equivalent of indicated power per unit time to heat supplied to the engine in unit time. The inter relationships between efficiency heat rejection and thermal. In si units it is joule per joule but often also expressed as joule kilowatt hour or british thermal units kwh. V mf is fuel oil supplied kg sec c.
Since it is dimensionless number we must always express w q. Brake thermal efficiency η bth brake thermal efficiency can be defined as the ratio of brake power bp to input fuel energy in appropriate units. When the engine is operating at part load the gross thermal efficiency falls to approximately 28 9 at 22 load rating. For a heat engine thermal efficiency is the fraction of the energy added by heat primary energy that is converted to net work output secondary energy.
For a refrigeration or heat pumps thermal efficiency indicates the extent to which the energy added by work is converted to net heat output. Is the useful work and is the total heat energy input from the hot source. Indicated thermal efficiency indicated power mf c. The indicated thermal efficiency gives an idea of the power generated by the engine consider zero heat loss within the cylinder with respect to heat supplied theoretically calculated chemical energy of fuel in the form of fuel.
In the case of a refrigeration or heat pump cycle thermal efficiency is the ratio of net heat output for heating or removal for cooling to energy input the coefficient of performance. Is calorific value of fuel in kj sec indicated power is power developed inside cylinder. Indicated thermal efficiency ηi. The thermal efficiency η th represents the fraction of heat q h that is converted to work.
It is a dimensionless performance measure of a heat engine that uses thermal energy such as a steam turbine an internal combustion engine or a refrigerator. Thermal efficiency indicates the heat exchangers effectiveness to transfer heat from the combustion process to the water or steam in the boiler exclusive radiation and convection losses fuel to fluid efficiency indicates the overall efficiency of the boiler inclusive thermal efficiency of the heat exchanger radiation and convection losses output divided by input. This is because kilowatt hour is often used when referring to electrical energy and joule or btu.
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