Abstract
A mathematical model is presented which may be used to predict the temperature at any point in a multilayer chimney under the unsteady state conditions encountered with variable inlet temperature and mass flow rate of the chimney gases, and variable ambient temperature. The model satisfactorily predicts the temperatures measured in a three-layer experimental chimney over both the heating and cooling periods of operation. In particular, the model correctly determines the period of time for which any portion of the inner chimney liner is below the acid and water dewpoint temperatures of the chimney gases. By ensuring that this time is minimized by modifications in domestic chimney design and boiler operating conditions, the tendency for acid and water condensation and the attendant chimney corrosion can be substantially reduced.
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