A gas-fired combined heat and power plant delivers per cent of its fuel's heating…

PHYSICS · Multi-part · Fermi University Physics · Thermal, Statistical & Complex Systems · Earth, Climate & Energy Physics · The laws of thermodynamics

Energy from Physics, Ch Heat engines on fuel: exergy, real cycles, biomass and the nuclear heat source

Problem

A gas-fired combined heat and power plant delivers

32

per cent of its fuel's heating value as electricity and

48

per cent as district heat at

T_u = 350\,\mathrm{K}

. The surroundings are at

T_0 = 283\,\mathrm{K}

, and the fuel's exergy is

1.04

times its heating value. ((a)) Compute the energy utilisation

(W+Q_u)/Q_{\rm fuel}

. ((b)) Compute the exergetic efficiency

[W + Q_u(1-T_0/T_u)]/X_{\rm fuel}

. ((c)) Compute the plant's electricity alone, counted in exergy.

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