In a boiler trial the boiler pressure was 10 bar and the dryness fraction of the steam 0.95. Coal was burnt at 500 kg/h and 4000 kg/h of feed water was supplied at 50 °C (c_{p} = 4.187 kJ/kg·K). At 10 bar: h_{f} = 762.6 kJ/kg, h_{fg} = 2013.6 kJ/kg; latent heat at 100 °C = 2257 kJ/kg. Find (a) the factor of evaporation and (b) the equivalent evaporation from and at 100 °C in kg per kg of coal.