Publish On: 2018-12-09

Guy white

Total Post: 819

Question: Describe the efficiency of heat engines

Reply On: 2014-02-06

lala singh

Total Post: 22

ANS: Describe the efficiency of heat engines

The ideal, or thermodynamics, efficiency of a heat engine is defined from

Owing to heat losses and friction, no actual engine ever attains the efficiency defined by the ideal efficiency remain as an upper limit to the efficiency of any engine.

To improve the efficiency of a practical engine it is evident from that one should use a high input temperature and a low exhaust temperature. The use of cooling water in a condenser may reduce  T2 from about 100°C to about 40°C. Large steam turbines may have an input temperature T1 as high as 600°C and gas turbines somewhat higher. A practical limit is imposed by changes in the thermal characteristics of high temperature steam and by the endurance of turbine blades. The improvement in heat-engine efficiencies over the years is illustrated.

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