Energy Management - a Waste Heat Recovery System Can Be Installed in a Furnace Which Will Cost Rs. 7,00,000 to Install This System Is Expected to Have a Useful Life of 6 Years

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ENERGY MANAGEMENT

Q.1 : A plant consumes 4,500 tons of furnace oil per year (GCV =10,200 kCal/kg), as well as 43,000 MWh of electricity per year. Draw the pie-chart of percentage share of each type of energy based on consumption in kCal (1 kWh = 860 kCal)

Q2) How much Stream is recuire in a heat exchange to heat 120 kg/ hour of a process fluid From 40o C to 90o C. The specific heat of process fluid is 0.24 kCal/kg oC and the latent heat of steam is 540 kCal/ kg

Q.3

The following table shows the import bill of fossil fuels in million metric tonnes (MMT) and its cost in Crores Rupees over the last eight years.

(i) calculate the average annual percentage increase of fossil fuel imports

(ii) calculate the average annual percentage increase of the import bill

(iii) calculate the average costs for the last eight years, in Rs. Per metric ton of imported fossil fuels.

Q.4

Fuel substitution from a high cost fuel to a low cost fuel in boilers is common to reduce energy bill. For the following situations calculate:

i) annual reduction in energy costs in Crore Rs.

ii) annual change in energy consumption in %. (Calorific value of fuels not required for calculations)

Before substitution:

Steam output = 6 tons/hour

Fuel consumption = 1 ton oil per 13 tons of steam.

Operating hours = 6400 / Year

Fuel costs = Rs.13,000 /ton of oil

Boiler thermal efficiency (yearly average)= 82%

After Substitution:

Steam output = 6 tons/hour

Fuel consumption = 3 tons of waste wood per 13 tons of steam

Fuel costs = Rs.2,000 / ton of waste wood

Boiler thermal efficiency (yearly average) = 74%

Q.5 A company invests Rs.10 lakhs…...

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