Find the rated boiler horsepower, heat added tothe boiler, factor of evaporation, developedhorsepower, and percentage boiler rating for awater-tube boiler with the followingspecifications:Heating surface: 18,000 ft?.• Steam produced by boiler: 75,000 lb/hr.• Pressure: 150 psia.• Heat contained in 150 psia steam: 1,194.1 Btu/lb.• Feed-water temperature: 180°F.

Answered: Image /qna-images/answer/d3ec4c1e-f69b-4af9-8651-90d46d4c7d33.jpg

Answered: Find the rated boiler horsepower, heat…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A single-acting, single-cylinder air compressor is rated at 4.25 m3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV1.35 = A. Determine the power, in kW, required to compress the air. B.)what is the engine kW power needed to drive the unit if the combined engine-compressor efficiency is 84%? C.)if the compressor is to run two-stage at optimum intercooler pressure with perfect intercooling, what will be percentage of power saved?
Solve neatly and write legibly. show diagrams Indicate reference used to determine the properties of water Steam enters a reheat-regenerative turbine at 6 MPa and 400 o C. After partial expansion to 1.24 MPa the steam is withdrawn and passed through a reheater until temperature is 350 o C. Steam then re-enters the turbine at 0.22 MPa where m 1 is extracted for feedwater heating. Remaining steam expands to a condenser pressure of 0.015 MPa. On the basis of 1 kg throttled steam, find: a) steam rate of the cycle and engine, b.) heat rate
Solve neatly and write legibly. show diagrams Indicate reference used to determine the properties of water Steam enters a reheat-regenerative turbine at 6 MPa and 400 o C. After partial expansion to 1.24 MPa the steam is withdrawn and passed through a reheater until temperature is 350 o C. Steam then re-enters the turbine at 0.22 MPa where m 1 is extracted for feedwater heating. Remaining steam expands to a condenser pressure of 0.015 MPa. On the basis of 1 kg throttled steam, find:a) W and W p , b) Q A and Q R , c) thermal efficiency of the cycle and engine, d) steam rate of the cycle and engine, e) heat rate
8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3
In a marine gas turbine unit, a high-pressure stage turbine drives the compressor and a low-pressure stage turbine drives the propeller through suitable gearing. The overall pressure ratio is 4/1 and the maximum temperature is 650 o the isentropic efficiencies of the compressor, H. P. turbine, L. P. turbine are 0.8, 0.83 and 0.85 respectively and the mechanical efficiency of both shafts is 98 %. Sketch the process on the T-s diagram i. Calculate the pressure between turbine stages when the air intake conditions are 1.01 bar and 25 oC. ii. Calculate also the thermal efficiency and the shaft power when the mass flow is 60 kg/s. NB: Neglect kinetic energy changes and the pressure loss in combustion.
The influence of maximum temperature on the efficiency of a Rankine cycleis desired. Holding the maximum and minimum pressures constant at 1000psia and 2 psia, respectively, what is the thermal efficiency if the boiler outletsteam temperature is (a)8000F, (b)10000F, and (c)12000F?
A Rankine engine has a 1 bar condensing pressure. When the steam at the beginning of expansion is at 50 bar and (a) saturated, (b) 3500F, and (c) 6400F, determine the net work and thermal efficiency for 1 kg/s of steam. Include flowchart using the attached image
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A 1000-MW supercritical double-reheat steam power plant operates withthe main (live) steam condition of 250 bars and 560°C and the condenserpressure of 0.04 bar. The steam is reheated first at 30 bars to 560°C andthen at 4 bars to 560°C. The turbine efficiency is 0.92. The feed pumpwork may be ignored. Calculate: (a) the plant net specific work, (b) the plant thermal efficiency, (c) the plant steam mass flow rate, and (d) the plant heat rate.
Explain in detail why we need superheated steam in a power generating plant and use T-S diagrams to support your explanation.
The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 16.3846 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Combined work (KW) . Ans.____________________________ Combined steam rate in kg/KW-hr. Ans.___________________________ Actual heat rate( KJ/KW-hr). Ans.____________________________
At throttling calorimeter receives steam from a boiler drum at0.11MPa and is superheated by 10 degrees. If the boiler drum pressure is 1.55 MPa, what is the quality of the steam generated by the boiler?

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