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7th National Certification Exam Energy Managers & Auditors NOVEMBER 2008 Paper 1

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Paper 1 Set A Key Regn No: _________________ Name: ___________________ (To be written by the candidates) 7th NATIONAL CERTIFICATION EXAMINATION Nov. 2008 FOR ENERGY MANAGERS & ENERGY AUDITORS PAPER 1: General Aspects of Energy Management & Energy Audit Date: 22.11.2008 Timings: 0930-1230 HRS _________________________ Bureau of Energy Efficiency Duration: 3 HRS Max. Marks: 150 1 Paper 1 Set A Key _________________________ Bureau of Energy Efficiency 2 Paper 1 Set A Key _________________________ Bureau of Energy Efficiency 3 Paper 1 Set A Key _________________________ Bureau of Energy Efficiency 4 Paper 1 Set A Key _________________________ Bureau of Energy Efficiency 5 Paper 1 Set A Key _________________________ Bureau of Energy Efficiency 6 Paper 1 Set A Key Section - II: SHORT DESCRIPTIVE QUESTIONS Marks: 8 x 5 = 50 (i) Answer all Eight questions (ii) Each question carries Five marks S-1 What do you understand by energy management and energy efficiency ? Ans ENERGY MANAGEMENT: The fundamental goal of energy management is to produce goods and provide services with the least cost and least environmental effect. One definition of energy management is: The judicious and effective use of energy to maximize profits (minimize costs) and enhance competitive positions The objective of Energy Management is to achieve and maintain optimum energy procurement and utilisation, throughout the organization and: To minimise energy costs / waste without affecting production & quality To minimise environmental effects. ENERGY EFFICIENCY Energy efficiency is achieved when energy intensity in a specific product, process or area of production or consumption is reduced without affecting output, consumption or comfort levels. Promotion of energy efficiency will contribute to energy conservation and is therefore an integral part of energy conservation promotional policies. S-2 In a industry s electrical system what is meant by load factor ? The energy consumed by a plant was 24,000 kWh over a day. The maximum load recorded during this time was 1400 kW. What is the load factor for that day It is the ratio of average load to maximum load. In other words, it is the ratio of energy consumed during a given period of time to the maximum energy demand if maximum load is maintained through out that time period Load factor = 24,000/ (1400 x 24) = 71.4 % S-3 State any five components of the electricity bill charged to industrial consumers by an electric supply company. Maximum demand charges _________________________ Bureau of Energy Efficiency 7 Paper 1 Set A Key S-4 Energy charges Power factor penalty or bonus Electricity duty charges Time of the day (ToD) tariffs Meter rentals Lighting and fan power consumption Penalty for exceeding the contract demand Surcharges Investment for an energy proposal is Rs.20 lakhs. Annual savings for the first two years is Rs. 4 lakhs each and subsequent two years Rs. 6 lakhs each and fifth year is Rs. 7 lakhs. Considering cost of capital as 10%, what is the net present value of the proposal? Is it worth investing in this project ? 0 1 2 3 4 NPV = -20/(1.10) + 4/(1.10) +4/(1.10) + 6(/(1.10) + 6(/(1.10) + 7(/(1.10) -20 + 3.64 + 3.31 + 4.51 + 4.1 + 4.35 5 = -20 + 19.91 = -0.09 lakhs = Rs. 9000 (-) It is not worth investing in the project S-5 A thermal power plant uses 0.7 kg of coal to generate one kWh of electricity. If the coal contains 52% carbon by weight, calculate the amount of CO2 emissions/ kWh under complete combustion conditions. The Thermal power plant has saved 500000 kWh in a year in auxiliary power consumption by adopting energy conservation measures. Find out the amount of CERs (ton of CO2/year) they would gain if the project comes under CDM C + O2 ------------------- CO2 12 32 44 1 kg of carbon gives 44/12 kg of carbon dioxide CO2 emissions/kwh = 0.7 x 0.52 x 44/12 = 1.33 kg of CO2/kwh Amount of Carbon emissions reduced by Unit = 500000 x 1.33 = 665 ton of CO2/year _________________________ Bureau of Energy Efficiency 8 Paper 1 Set A Key = 665 CERs S-6 In a heat exchanger steam is used to heat 5 KL/ hour of furnace oil from 30o C to 90o C. The specific heat of furnace oil is 0.22 kcal/ kg/oC.and the density of furnace.oil is 0.95. a) How much steam per hour is needed if steam at 4 kg/cm2 with Latent heat of 510 kcal/ kg is used. b) if steam cost is Rs.3.50/kg and electrical energy cost is Rs.4/kWh, which type of heating would be more economical in this particular case Total heat required = m Cp T = (5 x1000x 0.95) * 0.22 * (90-30) = 62,700 kcal/hr Total heat of steam = 653 kcal/kg a) Amount of steam required = 62700/510 = 123 kg/hr Steam cost = 123 x Rs.3.50 = Rs.430.5/hr b) Amount of electricity required = 62700/860 = 72.9 kWh = 72.9 x Rs. 4 = Rs.291.6/ hr Electric heating will be more economical S-7 In a textile stenter the input is 1000 kg of wet cloth per hour. The cloth contains 65% moisture at inlet and 5 % moisture remains in the output cloth. Find out the quantity of moisture removed per hour. 1000 kg of wet cloth contains 1000 x 0.65 = 650 kg of moisture And 1000 x (1-0.65) = 350 kg of bone dry cloth As the final cloth contains 5% moisture, the moisture in the product is 350/.95 = 368.42 kg The moisture removed is 1000 368.42 = 631.58 kg/hr S-8 Define Sustainable development and give two examples of how it can be practiced in day to day life ? Sustainable development is defined as 'development that meets the needs of the present, without compromising the ability of future generations to meet their own needs'. _________________________ Bureau of Energy Efficiency 9 Paper 1 Set A Key Any relevant answer related to Saving energy and Reducing wastes -------- End of Section II --------- Section - III: LONG DESCRIPTIVE QUESTIONS Marks: 6 x 10 = 50 (i) Answer all Six questions (ii) Each question carries Ten marks L 1 An autoclave contains 2000 cans of pea soup. It is heated to an overall temperature of 100oC. If the cans are to be cooled to 40oC before leaving the autoclave, how much cooling water is required if it enters at 15oC and leaves at 35oC ? The specific heat of pea soup and the can metal are respectively 4.1 kJ/kgoC and 0.50 kJ/kgoC. The weight of each can is 50 g and it contains 0.50 kg of pea soup. Assume that the heat content of the autoclave walls above 40oC is 1.6 x 104 kJ and that there is no heat loss through the walls. Heat Entering: Heat in cans = weight of cans x specific heat x temperature above datum 3 = 2000 x 0.05 x 0.50 x (100-40) kJ = 3.0 x 10 kJ Heat in can contents = weight pea soup x specific heat x temperature above datum 5 = 2000 x 0.45 x 4.1 x (100 - 40) = 2.46 x 10 kJ Heat in water = weight of water x specific heat x temperature above datum = w x 4.186 x (15-40) = -104.6 w kJ. Heat Leaving: Heat in cans = 2000 x 0.05 x 0.50 x (40-40) (cans leave at datum temperature) = 0 Heat in can contents = 2000 x 0.45 x 4.1 x (40-40) = 0 Heat in water = w x 4.186 x (35-40) = -20.9 w o HEAT-ENERGY BALANCE OF COOLING PROCESS; 40 C AS DATUM LINE Heat Entering (kJ) Heat in cans 3000 Heat in can contents 246000 Heat in autoclave wall 16000 Heat in water -104.6 w _________________________ Bureau of Energy Efficiency Heat Leaving (kJ) Heat in cans 0 Heat in can contents 0 Heat in autoclave wall 0 Heat in water -20.9 W 10 Paper 1 Set A Key Total heat entering Total heat entering = 265000 104.6 w = 265000 -104.6 w Total heat leaving Total heat leaving -20.9 w w = 3166 kg Amount of cooling water required = 3166 kg. L 2 -20.9 W The details of activities for a pump replacement project is given below: a) draw a PERT chart b) find out the duration of the project c) identify the critical path. Activity Immediate Predecessors A B C C C D, E, F G A B C D E F G H Time (days) 2 2 4 6 3 5 9 8 b) The Duration of the Project = 31 days c) The Critical Path L 3 = 1-2-3-4-7-8-9 a) For complete combustion of 1 kg of a typical coal 12 kg of air is required. Calorific value of coal is 4200 kCal/kg with ash content of 25%. What is the quantity (in kg/hr) flue gas generated by burning 100 kg coal/ hr? b) The furnace oil consumption in a boiler generating steam is 160 kg/hr and the total losses in the boiler is 22%. Calculate the amount of steam generated per hour by considering 610 kCal is required to generate 1 kg steam. Consider GCV of furnace oil as 10000 kCal/kg. a) Flue gas generated by burning the coal in the presence of air is: Flue gas quantity (per kg of coal) : combustion air + quantity of fuel- ash : 12 + 1 - 0.25 : 12.75 kg _________________________ Bureau of Energy Efficiency 11 Paper 1 Set A Key Quantity of flue gas by burning 5 kg of coal : 100x 12.75 = 1275 kg. b) FO consumption rate = 160 kg/hr = 10000 Kcal/kg = 160 x 10000 = 1600000 Kcal/hr Total Loss @ 22% = 1600000 x 0.22 = 352000 Kcal/hr Total energy available to generate steam = 1600000 x 0.78 = 12488000 Kcal/hr Total steam generated = 12488000 -----------610 GCV of FO Total Input energy = 20472 kg/hr L 4 The following are the cash flows for retrofitting of a cooling tower project. YEAR 0 1 2 3 4 Cash flow -12,30,000 3,00,000 4,00,000 4,00,000 4,00,000 Calculate the IRR for the project Answer -12,30,000 = 3,00,000 + 4,00,000 + 4,00,000 + 4,00,000 (1.08)1 1.082 1.083 1.084 IRR = 8. % L 5 Write short notes on a) Designated consumers b) Standards and labeling c) Energy conservation building codes d) Role of certified energy manager a) Designated consumers The main provisions of the EC Act on designated consumers are: The government would notify energy intensive industries and other establishments as designated consumers; Schedule to the Act provides list of designated consumers which covered basically energy intensive industries, Railways, Port Trust, Transport Sector, Power Stations, Transmission & Distribution Companies and Commercial buildings or establishments; The designated consumer to get an energy audit conducted by an accredited energy auditor; _________________________ Bureau of Energy Efficiency 12 Paper 1 Set A Key Energy managers with prescribed qualification are required to be appointed or designated by the designated consumers; Designated consumers would comply with norms and standards of energy consumption as prescribed by the central government. b) Standards and labeling Standards and Labeling (S & L) has been identified as a key activity for energy efficiency improvement. The S & L program, when in place would ensure that only energy efficient equipment and appliance would be made available to the consumers. The main provision of EC act on Standards and Labeling are: Evolve minimum energy consumption and performance standards for notified equipment and appliances. Prohibit manufacture, sale and import of such equipment, which does not conform to the standards. Introduce a mandatory labeling scheme for notified equipment appliances to enable consumers to make informed choices Disseminate information on the benefits to consumers c) Energy conservation building codes The main provisions of the EC Act on Energy Conservation Building Codes are: The BEE would prepare guidelines for Energy Conservation Building Codes (ECBC); These would be notified to suit local climate conditions or other compelling factors by the respective states for commercial buildings erected after the rules relating to energy conservation building codes have been notified. In addition, these buildings should have a connected load of 500 kW or contract demand of 600 kVA and above and are intended to be used for commercial purposes; Energy audit of specific designated commercial building consumers would also be prescribed. L 6 A process industry is consuming the following energy per day 3000 kg of furnace oil for thermic fluid heater 5000 kg of coal and 3000 kg of rice husk for boiler 15,000 kWh of Purchased electricity from grid 10,000 kWh of self generated electricity through DG sets Calorific values of fuels: Furnace oil : 10,000 kCal/kg Coal : 5000 Kcal/kg Rice husk : 3000 Kcal/kg HSD : 10,500 kCal/kg Specific fuel consumption of DG sets: 3.5 kWh/kg of HSD _________________________ Bureau of Energy Efficiency 13 Paper 1 Set A Key Calculate input energy consumption in terms of Metric Tonne of Oil Equivalent for the industry. Diesel consumption = 10,000/3.5 = 2857 kg of Diesel per day (3000 x 10000) + (5000 x 5000) + (3000 x 3200) + (15,000 x 860) + (2857 x 10,500) MTOE = (3 x 107) + (2.5 x 107) + (0.9 x 107) + (1.29 x 107) + (3 x 107) 107 = 10.69 Metric Tonnes of Oil Equivalent per day -------- End of Section - III --------- _________________________ Bureau of Energy Efficiency 14

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