The equivalent evaporation (kg/hr) of a boiler producing 2000 kg/hr of steam with enthalpy content of 2426 kJ/kg from feed water at temp. 40°C (liquid enthalpy = 168 kJ/kg; enthalpy of vaporisation of water at 100°C = 2258 kJ/kg is:
1
1649
2
2000
3
2149
4
1682