
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

BEE Energy Sample / Model Paper 2025 : Energy : Thermal utilities

3 pages, 20 questions, 0 questions with responses, 0 total responses,

Nikhil Khare
Savitribai Phule Pune University (SPPU), Pune

+Fave Message

Profile Timeline Uploads

Home > energymonster >

Formatting page ...

<br> Savitribal Phule Pune University Centre for Energy Studies Term End Examinatlon May 2025 (Backlog) EN-312 Assessment of Thermal Energy Systems Date: 07/O5/2025 Examination Seat No. Instructions: 1. 2. Time: 10.00 am to 1 pm Maximum Total marks: 50 Figures in brackets on the right-hand side indicate full marks. Use of a log table/ non-prog rammable calculator is allowed, but the exchange ofa calculator is not allowed. Steam tables are alowed 3. A neat & labelled diagram must be drawn wherever necessary. Questlon 1. Answer thofollowing Questions MCQs [Any five] [5x1 =5 marks] iJ Combustion efficiency in boiler is The Effectiveness of the heat transfer in a boiler b. The effectiveness of the burner only and relates to its ability to completely burn the fuel Is d. ii) the measure of fuel to steam efficiency None of above Overall Natural gas turbine efficiency will be improved by a. G. d Increasing the Iniet air temperalure supplied to turtbine Preheating the air with flue gas+ Decreasing tho inlet air temperature supplied o turbine All the above fi) Heat Pipe heat exchanger is used in a. Dehumidification and cooling with moisture removal b. In HVAC systems C. For low grade heal applicalions d All the above gas determines the Volume of air needed for burning the fuel Temperature of exit gases Excess air supplied for burner for efective burning iv) Amount of % Oz in flue a. b. G. d. All the above <br> v) Which is the type of cogeneration cycle used in sugar industry cogeneration system, a. Topping cycle b. Bottoming cycle A. Botha &b d. None vi) Which term is used to determine furnace effectiveness? a. Specific fuel consumption b. Eficiency of furnace Both a &b d. None Question 2, AnSwor the following Questions fany fivel [4 x5 = 20 marks) ) What is meant by boiler turndown? HOw does the loading on the boiler affect its efficiency? Would you prefer to have a single boiler or multiple boilers if your plant that has batch operations has large variations in load? i) 0: % in flue gas is 8%, what is the quantity of excess air ? By reducing O:% to 4%, and exit fue gas lemperature is same, by how many percent will lhe efficiency of the furnace improve, if earlier flue gas loss is 60% & efficiency is 20%? i) What are the different applications af thermic fluid heating in Industries? Draw schematic of Thermic fluid heater? iv) Explain the terms heal rate of Gas turbine and what is overall efficiency of gas turbine if 100 kW power is generated with NG supply of 30 m per hour is supplied with GCV of 8500 kCalm. v) What are the various heat losses in heating furnaces. What is the range of efficiency of fuel fired furnaces for Forging furnace? Calculate the eficiency of a furnace if 500 kg of billets are -heated c in a batch using 50 Itrs of oil with GCV of 9800 kCalitr. Sp. heat of sleel is O.12 KCal kg v) What will be the surface heat loss from furnace body at 70 C and ambient temp of 35C S= (10+ (Ts-Ta)/20] x (Ts- Ta). If area of wall is 50 m?? is What will be the opening loss of furnace if inslde temperature is 1340*C and door opening 1x 1m and other factors are D/X = 2.17, factor of radiation= 0.7, Ahr, emissivity is 0.8 = Black body radiation corresponding to 1340 C 36.00 kCal/cm estion 3, Answer the following Questions (any three] 3 A. each. D. marks] trigeneration systems with examples of Explain briefly the difference between cogeneration and B. Explain the working C. x 5 = 15 are the applications of heat a of a heat pump with help of diagram. What can the waste heat pumps? examples. In the cement industry where List waste recovery applications with of kilns Used? in day and if 75% if heat is in planl with operating for 16 hours is kW of used 50 Air compressor can be recovered from the air in hot waler tank. How much heat recovery for heating available for compressor per day. = x (any two] [2 6 10 marks] Questions following the -stion Answer A thermic fluid flow rate is Used for curing the rubber, heater fluid a Ihermic during P. In a rubber factory temperature of thermic fluid is 210 and 190 C return supply heat is 10 lps is maintained and is 0.7 kcal/kg- C how much luid thermic sp. of heat If of 85%7 curing which takes 4 hours. the TFH if it has an efficiency is fuel consumption of what and curing for used 4. of <br> For wo hours after the completion of lhe first batch, the TFH operates continuously without load hours during which the thermic fuid temperature dilference is 210 and 202C. How much heat is lost in 2 hours idle run, and how much fuel is wasled if the efficiency rermains at 85%? for two Q. Presently electrical heaters of 50 kW are installed for hot water tank and daily consumpion of electricity y is 500 kWh, the price of electricity being Rs. 10kWh. a pump of output 50 kW is heat installed for heating the hot water tank with COP of 3. What will fbe the energy consumplion and the cost of heating with the heat pump? Also calculate the manetary savings compared to electrical heaters. parameters for a back pressure steam turbine cogeneration plant are gven below Inlet Steam: P =60 kg'cm,T= 310*C, Enthalpy = 29 16 kJ/kg R. The Outlet Steam: P 5.0 ka/cm,T= 158C, Enthalpy= 2756 kJ/kg Steam flow Q = 9000kg/hr Bagasse fuel is supplied ata rate F = 3375 kg/hr (2200 kCal/ Find out the power generation for this turbine kg of bagasse) Boiler efficiency 80% Process heat used is 2400 KJ/kg with steam of 9000 kg/hr What is power generated? Find the combined heat & power used in power lerms and its efficiency What is the plant heat rate kCalkWh and fuel heat rate kg/kWh for total plant (combined heat and power) S. In a boiler Ultimate analysls of fuel is C= 84, H= 12, N = 0.5, O = 1.5, S= 1.5, moisture 0.5. GCV of fuel =10000 KCalkg. Fuel fring rate =2648. 125 kg/hr, ambient air humidity = 0.025 kgkg of dry ai Flue gas analysis: flue gas temp =190*C, Amb temp = 30C, CO; % in flue gas = 10.8. O2 % in flue gas = 7.4 Use fornmulas = a) Theoretical air required (L.6xC)-(34.Sx(#; -o,/$))+(4.3SrS)]/100 kgkg of fuel 9xH, x {584 +C,(T, -T,)} x GCV of fuel Heat loss due to evaporation of water due to H; in fuel (3) Mx % Heat loss due to moisture in (584 +C, (T, -T, )} GCV of fuel AAS rhumtdy factor fiel % Heat loss due to moisture in [Erom fuel analysis] ar = x 100 100 C,x (T -I,)10 GCV of fuel Take radiation loss=1% Find the excess air, heat loss due to hydrogen in fuel, heat loSs due to moisture in fuel, heat loss due to moisture in ait, partial combustion of C to CO and find indirect efficiency of boiler a AII the Best! soos

Formatting page ...

energymonster chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: