A steam generator generates steam at an average rate of 50 000 kg/hour at a pressure of 3 000 kPa. The blow down is 10% of the steam generator's feedwater. The fuel consumption is 8 000 kg of coal per hour with a heating value 20 000 kJ/kg. What fuel saving in kilogram of coal per year will result from the installation of a blowdown heat-recovery system which will reduce the blowdown water temperature to 39 C? STEAM PROPERTIES P ts Vg hr hig Sf Sg hg kJ/kg kJ/kg kPa C m/kg kJ/kg.K kJ/kg 163 kJ/kg.K 8,277 7 39 20,53 2410 2 573 0,559 3 000 233,8 0,06663 1 008 1 794 2 802 2,646 6,184