Homework Set 13

Problem 1) Rankine Cycle Analysis Consider a simple Rankine cycle, steam power plant. The state points are defined in the schematic and the operating conditions are given in the Table la. The steam flow rate is 137.4 lbm/s. You may use "EES," but supply your code. a) Provide a quantitative T-s diagram including all state points, lines of constant pressure, and the "dome." b) Determine all the energy quantities and complete Table 1b. Discuss the value of the quality at state 4. c) Determine all the exergy quantities and complete Table 1c. Assume the dead state temperature is 77°F and the dead state pressure is 14.7 psia. d) Discuss your results. What additional insights does the exergy analysis provide? 3 Quoiler 4 Fuel State 1 2 3 4 State 1 2 3 4 State br (Btu/lbm) 1 ? 2 ? Boiler ? ? Table 1a: State Points and Other Items T (°F) p (psia) Variable ? 0.71 XI ? 700 turbine 1057 700 pump ? 0.71 boiler T (°F) p (psia) ? 0.71 Turbine ? 1057 ? Condenser Table 1b: Energy Results 700 700 0.71 W…

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Northern Technical University Technical college of Engineering / Mosul Engineering Mechanics (II)(second year) H.W: A large stationary Brayton cycle gas-turbine power plant delivers a power to an electric generator. The minimum temperature in the cycle is 300 K, and the maximum temperature is 1600 K. The minimum pressure in the cycle is 100 kPa, and the pressure at the end of combustion is 1400kpa, Calculate (1) the input work of the compressor, (2) the work output of the turbine, (3)work ratio and(4)the thermal efficiency of the process

| As a mechanical engineering technician, you are asked by your building manager to investigate the performance of a steam turbine at the main university building. Criticaly compare how heat transfer efficiency will affect the lifetime of the turbine.

[Engineering Thermodynamics] Please finish the answer with a diagram for reference to me (if needed).  Show the answer step by step and clear to see.  If you need to answer with words, please type directly. (to avoid cant see clear by handwriting) Thank you.

A diatomic gas engine contracts isothermally from V2 = 2.00 m³ and p2 = 172 kPa to a volume V₁ and pressure 574 kPa. The engine then follows an isobaric process to V2, then an isochoric process to the original pressure, p2. Calculate the engine's efficiency. [Hint: Start by drawing the engine cycle on a pV-diagram.] .1152

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Draw the schematic diagram of the problem; The steam used by a turbine is 5.50 kg/kw-hr at a pressure of 4.50 MPaa and a temperature of 373 degree Centigrade. The overall boiler effeciency is 85% with feedwater temperature at 165 degree Centigrade. a) How many kilogram of coal are required per kw-hr if calorific value of coal is 28,000 kJ/kg? b) If coal costs Php 440 per Metric Ton, what is the fuel cost per kw-hr? Copy the problem.

Write legibly so i can understand 4. In a Brayton cycle, air enters the compressor at 101.32 kPaa and leaves at a pressure of 808 kPaa. The air is heated to 717 o C in the combustor. For a net output of 2125 kW, compute: a) Mass flow rate (kg m/s ), b) power to drive compressor (kW), c) Gross power (kW) , d) thermal efficiency, e) mean effective pressure (kPaa)

7. Describe how one would calculate the net heat input or equivalently the net work developed by the Rankine cycle. Please select all answers that apply: a) Cycle work is calculated as W cycle = Q in-Q out b) In the calculation, W oycle = Q in- Q out, Qin is heat out from the condenser; Qout is the heat output from the boiler. c) In the calculation, W. input from the turbine. = Q in-Q out, Weycle = W. - W, where W, is the work output from the pump and W, is the work суcle wwww d) In the calculation, W Q in-Q out, Qin is heat out from the turbine; Qout is the heat output from the condenser. сycle e) In the calculation, W cycle = Q in-Q out, Qin is heat out from the condenser; Qout is the heat output from the turbine.

Projects 3: Gas turbine operated on Brayton cycle Gas turbine operated on Brayton cycle used for electric utility as separated or combined cycles with steam power plant. Broadly speaking, gas turbine cycle is preferred over steam power plant in power station. Therefore, your head of department asked you to investigate and study the possibility of upgrading the power plant in Project-1 to a gas turbine cycle or a combination of both. However, your head of department asked to deliver a report showing you professional evaluation and assessment for gas turbine cycle efficiency. This report will be used to convince the company board committee. Task.1 Your selection was a gas-turbine power plant operating on an ideal Brayton cycle and according to the manufacturing datasheets it has the following specifications: A pressure ratio of 14.77. The gas temperature is 350 K at the compressor inlet and 1500 K at the turbine inlet. Under the assumption of standard air, perform the following: 1. Gas…