Question

Nuclear Versus Natural Gas Energy Because of safety concerns and other constraints, nuclear power plants must be run at lower efficiencies than natural gas-fired power plants. The efficiency of a particular gas-fired power plant is 42.5 % and that of a nuclear plant is 33.4 %. For every 1.00 kJ of mechanical work (to generate electricity) produced by the gas-fired power plant, how much energy is exhausted as waste heat?

Answer 1

Efficeincy of Gas firred power plant is 42.5 %

that means for evry 100 Joule of Given energy 42.5 joule is used in mechanical work and 57.5 Joule is exhausted as waste heat.

So

for evey 42.5 Joule of mechanical enery the waste energy is = 57.5 Joule

                1   Joule of mechanical enery the waste energy is   = 57.5 / 42.5

and 1.0 kJ Joule of mechanical enery the waste energy is   = (57.5 *1 kJ ) / 42.5

                                                                                                           = 1.35 kJ