Heat engine is a device which operates a thermodynamic cycle and produces work by supplying heat from hot reservoir.
HEAT ENGINE AND ITS PERFORMANCE
Heat engine is a device which operates a thermodynamic cycle and produces work by supplying heat from hot reservoir. Example: Internal combustion (I.C.) engines, boiler etc.
The performance of any engine is measured by the term 'efficiency'. It is defined as the ratio of network output produced by an engine to the amount of heat supplied to the engine. It is expressed as given below.
where
W - Work done
Q1 - Heat supplied from the heat reservoir at temperature T1
We know that
W = Q1 – Q2 ...(2.2)
where
Q2 - Heat rejected from the engine to the sink or cold reservoir at temperature T2
Substituting (2.2) in (2.1), then the efficiency becomes
where T1 and T2 are high and low temperature of reservoirs respectively.
The thermal efficiency of a heat engine is always less than unity. Thermal efficiency is a measure of how efficiently a heat engine converts the heat into work.
No comments:
Post a Comment