Generating stations 10

 Question = A thermal station has an efficiency of 15% and 1 kg of coal burnt for Every kWh generated . Determine the calorific value of coal ?

Solution = let, 

» X kcal/ kg be the calorific value of fuel . 

» heat produced by 1 kg of coal = 1 kg × x kcal , 

» heat equivalent of 1 kwh = 860 kcal , 

» thermal efficiency = 860 kcal / 1 kg × x kcal/ kg , 

» 15% = 860 kcal / 1 kg × x kcal/kg , 

» x kcal/ kg = 860 kcal /1 kg × 0.15 , 

= 5733 kcal/ kg , answer ✓