A boiler has a sliding grate and a hearth volume of 25.4 m³ with solid refractory walls. The boiler burns lump coal, with PCS=13,000 BTU/Ibm and PCI=10,360 BTU/Ibm. Suppose that you want to install a boiler for the same thermal power, but you decide to burn solid waste with a composition of 72.6% C, 3.4% H, 13.9% Ο, 1.2% N and 8.9% S. Will the boilers have the same volume? Will it be bigger or smaller? Determine (in percent) the change in volume of household size.
PCS= Higher heating value
PCI= Lower calorific value