Comparison Of Solar Water Heaters With Oil Fired Boiler
System capacity 125 LPD
Average output temperature 65 deg. C.
Average input temperature 25 deg. C.
Total heat gain System cap. x temp. difference
= 125 x 40 kcal = ,5000 kcal
Approx. total cost Rs. 25,000/- (US$1=@Rs.55.00)
Boiler efficiency @ 80 %
Operational days in a year 300
Calorific value of oil 10280 kcal/kg
Purchase Cost @ Rs. 30- per liter
Specific gravity of oil 0.8
Oil required per day = Heat gain/ (calorific value x sp. gr. x boiler efficiency)
= 5000/ 10280 x 0.8 x 0.8
= 0.76 liters
Saving per day = 0.76 x Rs. 30/- = Rs. 22.80
Saving per year = 22.80 x 300 = Rs. 6840/-
Payback period = Net cost / saving per year
= 25,000/ 6840
Payback period = 3.65years
Payback period with subsidy 2.77 years
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