Abstract
The author has for many years considered that it should be possible to design a diagram for the graphical analysis of problems arising in the transmission of heat in boilers. It became clear that such a diagram, comparable with the ideal indicator diagram or the temperature-entropy chart, could easily be designed if reliable and explicit data relative to transmission of heat by radiation were available. The position seemed to be this: the simple efficiency formula ( T1 — T2)/ T1 could be used if the correct temperature T1 could be determined, assuming also that the variation in the specific heat of the gases at widely varying temperatures was relatively unimportant. This T1 temperature is not, of course, the temperature measured over the furnace bed, but the temperature which would be observed if the coal were burned in a highly refractory chamber instead of being subject to more or less rapid cooling by the adjacent heating surfaces of a boiler. Thus this so-called theoretical temperature may be calculated for any given coal and CO2 content, provided the latter is not influenced by air leaks. The temperature of rejection T2 is, of course, easy to ascertain with accuracy. The author expresses the hope that such a diagram may be of some value to lecturers, and examples of its use are given. Arising from the design of the diagram, the author proposes a method of investigating the heat transmission by radiation and convection through the plates of Lancashire boilers: other matters of importance to the heavy industries were dealt with in detail in the original paper, and the salient features are discussed in this abridgement.
Published Version
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