## Summary Examples

Following are four examples of how the terms and formulae provided above are applied to specific representative prime mover systems. All values are given in English units and the assumed fuel is pipeline grade natural gas with an HHV of 1,020 Btu/cf and LHV of 918 Btu/cf. Fuel costs are given for each example on the basis of 1,000 cf (1 Mcf).

For simplicity, the performance + A Operating costs + Annualized capital cost expressions are applied under idealized

This expression can be extended further to reflect life-cycle CCP. Based on an assumed financial discount rate, the life cycle CCP would be the sum of the present values of the annualized CCP over the life of the systems. To perform this calculation, a present value factor is full load operating conditions. In actual applications, prime mover performance will be directly related to continually varying operating conditions. For example, operation under varying load conditions or at varying inlet air temperatures usually results in a change in heat rate from rated full load operation. Numerous other factors will also influence actual performance.

 Term English Units SI Units Thermal efficiency (Eq. 2-9) Net work output Heat energy input Btu/h or iwWh x 100% Heat energy input Net work input BtuUh = Btu/hp-h hp kWhJh or kWW = kWhh/kWhm Net thermal efficiency (Eq. 2-16) ( Net work output ) jqqo/ / hp x 2,545 Btu/hp-h \ ( kWm x 3,600 kJ/kWhm \ \ Heat added — Heat recovered) \BtuHeat added/h - BtuHeat recovered/h) X 100% \kjHeat added/h kJHeat recovered'h/ Heat added — Heat recovered BtuEnergy added/h — BtuHeat recovered/h kJEnergy added/h kJHeat recovered/h Net work output hp kWm Energy-chargeable-to-power (Eq. 2-19) Total heat added — Displaced fuel energy Net power output BtuHeat added — BtuHeat recovered x tf.Boiler kkJHeat added ~ kkJHeat recovered x ^Boiler hp-hOutput— hp-hAuxilliary input k'^WhmOutput k'^Whm Auxiliary input Table 2-1 English and SI Units Commonly Used in Performance Terms.
 Example 1

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