Based on the principle and method for evaluating uncertainty

an uncertainty analysis model of anti-balancing thermal efficiency has been established

so as to determine the relationship between related parameters and each kind of heat loss.Two algorithms for calculating sensitivity

namely the partial derivative method and the value perturbation method

have been presented.According to the model and uncertainty principle

a coal-fired boiler of 600 MW unit is taken as an example for evaluating the uncertainty in thermal efficiency test of the said boiler.Results show that the main factors affecting the uncertainty in result of anti-balancing thermal efficiency test of said boiler are the flue gas temperature

the carbon content in fly ash

and the oxygen content in flue gas.Based on these

an approach for reducing uncertainty in anti-balancing test has been made.