GUJARAT TECHNOLOGICAL UNIVERSITY
BE SEM-VII Examination-Nov/Dec.-2011
Subject code: 1719
Subject Name: Energy conservation and Management
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Discuss in brief Energy conservation Act 2001 and its features.
(b) Define Energy management. State the basic principles and benefits of
Q.2 (a) What do you mean by ‘Energy audit’? Discuss types of energy audit
(b) Write note on ‘Indian Energy scenario.’
(b) A domestic food refrigerator maintains a temperature of -100C. The
ambient temperature is 400C. If heat leaks into the freezer at a
continuous rate of 2kJ/s, determine the least power necessary to pump
this heat out continuously.
Q.3 (a) State key elements of Energy monitoring and targeting system. Also
discuss its benefits.
(b) Explain in brief the following:
(i) Renewable and nonrenewable energy.
(ii) Commercial and Noncommercial energy
(iii) Low grade and High grade energy
(iv) Energy security
Q.3 (a) What do you mean by Pay back period?
A co-generation plant installation is expected to reduce a company’s
annual energy bill by Rs.24 lakhs. If the capital cost of the new cogeneration
installation is Rs.90 lakhs and the annual maintenance and
operating costs are Rs. 6 lakhs, What will be the expected pay back
period for the project?
(b) The following sample data are produced during monitoring programme.
Establish Energy-Production relationship for the given foundry case.
Also Plot the Energy-production graph for nine months.
Month Production ton month Energy Toe month
1 320 300
2 520 400
3 240 280
4 620 424
5 600 420
6 380 340
7 440 340
8 460 380
9 520 38 0
Q.4 (a) Using the net present value method, evaluate the financial merits of two
proposed projects shown in table. The annual rate is 8 % for each project.
Capital cost Year Project 1 Project 2
Net amount Net amount
Saving Amt(Rs.) Saving amount(Rs.)
1 +6600 +6000
2 +6600 +6000
3 +6300 +6000
4 +6300 +6000
5 +6000 +6000
6 +6000 +6000
7 +5700 +6000
8 +5700 +6000
9 +5400 +6000
10 +5400 +6000
Total net saving at end of tenth year +60000 +60000
(b) Discuss the role of Energy service companies (ESCOs).
Q.4 (a) Discuss the sources of waste heat and its potential applications.
(b) With a neat sketch explain Gas turbine co-generation plant
Q.5 (a) What are co-generation plants? Explain the difference between
bottoming and topping cycle co-generation plants.
(b) A portable machine requires a force of 250 N to move it. How much
work is done if the machine is moved 25 m and what average power is
utilized if the movement takes 50s?
(c) Explain in brief Energy efficiency versus Energy conservation. Write
step wise procedure to calculate Boiler efficiency.
Q.5 (a) A three phase induction 75 kW motor operates at 55 kW. The measured
voltage is 415 V, Current 80 A. Calculate the power factor of the motor.
(b) Explain the following :
(i) Reactive power and Active power
(ii) Explain the importance of TOD (time of the day) tariff
(c) Prepare a list of five measures for energy optimization in boilers and in
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