FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Given 0.603MW 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).
a) Calculate the total rate of entropy production
b) Calculate the total rate of exergy destruction (W). The dead state temperature is 293.2 K and pressure is 1 bar.
c) Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of the problem 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.
9 In a constant temperature,
transferred to the working fluid at 80F. What is the change of entropy
of the working fluid, KJ/kg-K?
closed system process, 120 BTU of heat is
10
1ne in -rease
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when
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Steam at 5.2 MPa, 4000C expands in a Rankine turbine to 0.036MPa. For 136 kg/s of steam, determine the work, the thermal efficiency, and the steam rate (a) fot the cycle(b) for the turbine, (c) for an actual turbine with the same specifications, the brake steam rate is 4.80 kg/kwh ang the driven electric generator has an efficiency of 93%, Find brake thermal efficiency , brake engine efficiency, combined work, and quality or temperature of exhaust steam.
Don't answer the given problem, just give me the schematic diagram and T-S diagram of the given problem
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- Only question 4 please!arrow_forward) An open type heat exchanger (feed water heater) operates at 7 bar pressure. Compressed liquid water and superheated steam at 35°C enter heat exchanger and exits as saturated liquid. As the ratio of mass flow rates of compressed liquid and superheated steam flows is 4.5/1, determine a) The temperature of superheated steam b) Entropy generation during this process in kJ/kg.pthund stam K KARIŞIM ODASI 7 bar T35°C Pe7 bar su Kızgın buhar P-7 bar su P7 bar ve x0 su n, = m, + ih, -0.222 c)arrow_forwardSU-2 A gas at 500K is in a cylinder with a frictionless piston. The gas goes thru a reversible cycle during which it absorbs 400J from a reservoir at 500K. During part of the cycle the gas rejects heat Q to a reseroir at 300K. Let the system be defined as the gas. a) What is the change in entropy for the system for one cycle of operation of the engine? Briefly explain your answer. b) Find the change in entropy for the universe for one cycle of operation of the engine. Briefly explain your answer. c) Find the change in entropy for the surroundings for one cycle of operation of the engine. Briefly explain your answer. d) Use your results from the previous parts to find how many joules of heat were rejected to the 300K reservoir during this process.arrow_forward
- Answer both questions please! Will leave a vote!arrow_forwardHelium at 660 K expands in a turbine to 420 K during which 77 kJ/kg of heat was lost to the surroundings which are at 27 °c. The pressure across the turbine was 6.0, What is the isentropic efficiency "%"?arrow_forward2. Steam is supplied to a fully loaded 100-hp turbine at 20 psia with u, Exhaust is at 1 psia with u, v, = 1100 fps. The heat loss from the steam in the turbin is 1 Btu/lb. Neglect potential energy change and determine (a) th work per lb steam and (b) the steam flow rate in lb/h. 1163.3 Btu/lb, v, = 2.65 ft/lb and v, = 400 fps = 925 Btu/lb, v, = 294 ft/lb an %3D %3D Solution p = 200 psia u, = 1163.3 Btu/lb. v = 2.65 ftlb %3D P2 = 1 psia = 925 Btu/lb V2 294 ft31b %3D %3D v, = 400 fps V2 = 1100 fps Q =-10 Btu/lb %3D Turbine W = 100 hp 2- 2 P, + K, + W + U, + Q = P, + K, + W + U, + w f2arrow_forward
- In a Bell-Coleman cycle air is drawn into the cylinder of a compressor at a pressure of 1 bar and 5°C. It is then compressed adiabatically to 5 bar (in the reversible manner) at which pressure it is cooled to 15°C, it is then expanded in the expansion cylinder to atmospheric pressure and discharged into the refrigerated chamber. Law kg тin are. of expansion is PV1.2-C. The COP of the refrigerating plant and capacity of the plant in TR for a mass flow rate of 10arrow_forwardWhat is the COP of the Carnot refrigerator if the COP of the Carnot heat pump is 2.3 where two cycles are operation between identical reservoirs?arrow_forwardSteam is delivered to turbine at 5.4 MPa and 600 degree C. Before condensation at 31 degree C, steam is extracted for feed water heating at 0.6 MPa. The turbine exhaust is 60 degree C. the required values of some state point properties are tabulated below. 10. Calculate the net work of the cycle.arrow_forward
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