A biomass material has an ultimate analysis $(\%$ weight on a dry basis$)$ of:

The fuel has a moisture content $Ym,w=30\%,$ on a wet basis.

a$)$ Estimate the higher heating value $(2$p$)$

b$)$ The biomass will be combusted with $35\%$ excess air. How much air is needed per $kg$ of fuel for the

combustion? $(3$p$)$