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1. A steam turbine inlet is at 1200 kPa, 500?C. The actual exit is at 300 kPa, with actual work of 407 kJ/kg. What is its second-law efficiency?
2. Find the second-law efficiency for the compressor in Problem 8.21.
Problem 8.21
An air compressor takes air in at the state of the surroundings, 100 kPa, 300 K. The air exits at 400 kPa, 200?C using 100 kW of power. Determine the minimum compressor work input.
The truck is driving onto the stationary barge at the speed of v1. The masses of the truck and the barge are m and M, respectively. The barge is free to move on the water and the water resistance is to be ignored.
If metal sorption to algae can be modeled by a Langmuir isotherm, determine the mass distribution (sorbed vs dissolved) of lead in the marsh.
The floating platform shown is supported at each corner by a hollow sealed cylinder 1 m in diameter. The platform itself weights 30kN in air, and each cylinder weighs 1.0 kN per meter of length
Helium expands in a nozzle from 150 psia, 900 R, and negligible velocity to 15 psia. Calculate the throat and exit areas for a mass flow rate of 0.2lbm/s, assuming the nozzle is isentropic.
From a photograph one observes that on a level section of highway 10% of the vehicles are trucks, 90% are cars, and that there are 50 vehicles per mile of highway. The trucks travel at 40 mph,
An overflow spillway 1,600 feet long is designed to pass 120,000 ft3/s of water. A 1:20 scale model of the cross section of the structure is built in the laboratory. It is assumed that the flow is two dimensional so only a 1-foot section
question 1. what is the difference between labor cost and labor pro-ductivity? use a sketch to illustrate.question 2.
Perform a material balance on substrate (S) around a chemostat (completely mixed reactor without recycle) assuming a first-order removal for a substrate with a rate constant of 0.5 hr-1. The influent substrate concentration is 150 mg/L
A circular sewer with a 1.5m inside diameter is designed for a flow rate of 15m^3/s when flowing full. Assume that the Manning roughness coefficient and Darcy friction factor are constant with depth of flow. The flow rate when the depth of flow is 0...
Create a depreciation schedule showing annual depreciation amounts and end-of-year book values for a $26,000 asset with a 5 year service life and a $5000 salvage value, using the MACRS depreciation method.
what value for Fy are the two forces F1=4i+Fyj+20K(N) and F2=8i-5j+7k(N) perpendicular to each other
The axis of the three-hinged arch ABC is a parabola with vertex at B. Knowing that P=109.2 kips and Q=72.8 kips, determine (a) the components of the reaction at C, (b) the components of the force exerted at B on segment AB.
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