This document is intended to be a comprehensive guide to calculate the heat-rate and other controllable loss parameters for a fossil steam generating unit. Most of the pertinent calculations are explained and presented in a form where they can be implemented using PI Asset Analytics. Some useful industry rule-of-thumb guidelines are applied in calculations to quickly determine the heat-rate effects of various deviations. However, note that particular heat-rate effect calculations can vary by unit design and should be performed using the parameters in the thermal performance kit provided by the turbine manufacturer for a particular plant to be most accurate.

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