Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Chapter 4, Problem 4.4CU
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1- Calculate the percent energy distribution in a steam generator that goes into steam, losses
to flue gas. The steam generator receives 480 short ton coal per day. The heating value of
coal is 5600 KJ/kg. 833000 KJ/kg of water enter steam generator at 175 bar and 230 °C
and leaves as steam at 180 bar and 540 °C . Combustion air enters at 27 °C and flue gases
leave at 175 °C. The air to fuel ratio by mass is 20:1. Assume that the flue gases have the
same variable specific heat as air.
4
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P3= 20 Bar
SATURATED VAPOR
400°C
T3 = 500°C
KINETIC AND POTENTIAL ENERGY =
STEADY STATE
= 0,6 Bar
TURBINE 1
TOTAL POWER iN kW
RATE OF HEAT TRANSFER
Ø
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TURBINE 2
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1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
Ch. 4 - Prob. 4.1ECh. 4 - Prob. 4.2ECh. 4 - Prob. 4.3ECh. 4 - Prob. 4.4ECh. 4 - Prob. 4.5ECh. 4 - Prob. 4.6ECh. 4 - Prob. 4.7ECh. 4 - Prob. 4.8ECh. 4 - Prob. 4.9ECh. 4 - Prob. 4.10E
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- 1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…arrow_forward2.2 A single stage single acting reciprocating air compressor is required to handle 30m3 of free air per hour measured at 1 bar. the delivery pressure is 6.5 bar and the s peed is 450 r. p.m allowing volumetric efficiency of 75%; an isothermal efficiency of 76% and mechanical efficiency of 80%. Determine 2.1.1 the indicated mean effective pressure and 2.1.2 the power required to drive the compressor.arrow_forwardb) The compressor delivers gas at a constant pressure of p3 = 10bar to a tank via a valve with flow coefficient, C, = 5. The tank has a volume of 1.5m³. The air in the tank is initially at atmospheric pressure, and has the same temperature as the air exiting the compressor. Using the following valve flow rate equations, calculate the time required for the pressure in the tank to increase to 4 bar (abs). q = CyP3N (1– Ap 24p P3G,T3 3p3 If Ptank > P3/2. 1 If Ptank < P3/2. q = 0.471 C,p3N G,T Where N = 6950 when volumetric flow rate, q, has units = litres/min at standard conditions, temperature has units K, and pressure has units = bar (abs). Note that the specific gravity, Gg = (density of actual gas at standard conditions) / (density of air at standard conditions). c) The maximum volume of the compressor cylinder (i.e. V,) is 0.01m³. Calculate the rotational speed of the compressor required to deliver a mass flow rate of 0.2kg/s, and calculate the shaft power required to drive the…arrow_forward
- 1. A single-acting, single-cylinder air compressor is rated at 4.25 (m)^3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV^1.35 = C. Determine the power, in kW, required to compress the air. a. -30.22 kW b. -22.87 kW c. -82.27 kW d. -27.22 kWarrow_forwardA system temperature and pressure becomes equal to that of the earth and transfer of energy ceases is known as unavailable energy Select one: O True O False One tonne of refrigeration is equal to 0.035 W. Select one: O True O False Which statement is FALSE O A. Impeller is absent in reciprocating compressor O B. Diffuser is present in reciprocating compressor O C. Rotary compressors are the capability of running at high speeds O D. Reciprocating compressors are bulkyarrow_forwardFLUID MECH Support your answer with the appropriate solution and diagram. 5. Air at 2.50 kg/m^3 enters a nozzle that has an inlet to exit ratio of 2:1 with a velocity of 120 m/s and leaves with a velocity of 330 m/s. Determine the density of air in kg/m^3 at the exit. A. 1.02 B. 1.82 C. 2.78 D. 4.02arrow_forward
- Derive the 7 general property equation of the following thermodynamics processes: a. ISOMETRIC PROCESSarrow_forwardQUESTION 1 Match the laws accordingly. | 1st law of thermodynamics A. No Heat Engine can be more efficient than a Reversible Heat Engine operating between the same temperature limits 2nd law of thermodynamics (foward engine) B. The internal energy of a perfect gas is a function of the absolute temperature only c. When a system undergoes a complete cycle, the net Heat supplied plus the net Work input is zero. Joules law 3rd law of thermodynamics 2nd law of thermodynamics (reverse engine) D. It is impossible to construct a device that operating in a cycle will produce no effect other than the transfer of heat from a cooler to a hotter body. E. A pure crystalline substance at absolute zero temperature is in perfect order, and its entropy is zero Second law of thermodynamics (Carnot) F. It is impossible for a heat engine to produce a net work output in a complete cycle if it exchanges heat only with a single energy reservoir.arrow_forward1- During a steam generator performance test, the following data were taken: Fuel data: Type=Coal Mass flow rate=2.5 kg/s High heat value=32.5 Mj/kg Steam data: Pressure=13 bar Dryness fraction=99.5% Mass flow rate=25 kg/s Feed water data: Saturated at 50 C° Calculate the steam generator efficiency.arrow_forward
- 1. The mean effective pressure of an engine running at 300 rpm is 500 kPa. What is the indicatedpower if the engine has bore of 250 mm x 450 mm. Select the correct answer below: A. 110.5 kW B. 150 kW C. 200 kW D. 182. 2 kW 2. In a certain process, entering is 1500 KJ/kg and 150 m/s. If the energy leaving is 12000 Kj/kg/ Determine the velocity at exit. Select the correct answer below: A.) 145 m/s B. 1020 m/s C. 789 m/s D. 978 m/sarrow_forward1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg. Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuel entering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. The products of combustion leave this process at the dead state. I already figured…arrow_forward1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. 1.2 Calculate the total rate of entropy production in Problem 1.1. 1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead state temperature is 293.2 K and pressure is 1 bar. 1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg 1.6 The utility providing the electricity to the boiler in problem 1.1 uses…arrow_forward
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