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Estimate the optimum thickness of insulation for the roof of a house given the following information. The insulation will be installed flat on the attic floor. Overall heat transfer coefficient for the insulation as a function of thickness, U values (see
The cost of insulation, including installation, is $120/m3 . Capital charges (see Chapter 9) are 20% per year. The cost of fuel, allowing for the efficiency of the heating system, is $8/GJ. The cost of cooling is $5/GJ. Average temperatures for any region of the United States or Canada can be found online at www.weather.com (under the averages tab). Assume the house is heated or cooled to maintain an internal temperature in the range 70 °F to 80 °F.
Design a hydro cyclone system to handle 1200 liters/min of this slurry.
n-Pentane is burned with excess air in a continuous combustion chamber. Calculate the percent excess air fed to the reactor and the fractional conversion of pentane.
Using the concepts of material balances, determine how much (in moles and lbs) air is needed and CO2, N2, CO, and H2O are emitted for every gallon of gasoline burned in your car's engine.
A plant is producing 10,000 metric tons per year (10 kt/y or 10 kMTA) of a product. The overall yield is 70 wt% (0.7 kg of product per kg raw material). The raw material costs $500/metric ton, and the product sells for $900/metric ton. A process m..
A 2300-V, three-phase, wye-connected, round rotor synchronous motor has a synchronous reactance of 3 Ω per phase and an armature resistance of 0.25 Ω per phase. The motor operates on load with a power angle of -15°, and the excitation is adjusted ..
Empirical correlation/model for onset of flooding in gas-liquid flow in horizontal pipe MatLab
Her model indicated that if Stogy hired two rollers per week during the entire first year, inventory would stand at 2,697,000 cigars by year's end.
1 mol of liquid hexane at 10 bar, 25 °C, is mixed adiabatically and under constant pressure with hexane vapor at 180 °C. Determine the moles of the vapor that must be mixed with the liquid in order to produce a final state that consists of a vapor..
The labor force is 100 million and the unemployment rate is 5 percent. One million people quit looking for a job. What is it called when an individual leaves the labor force, and in this case what is the new unemployment rate?
The efficiency at rated load, 0.8 power factor lagging, and at half-load, unity power factor.
Calculate the mass of methane that must be burned to provide enough heat to convert 363.0 g of water at 43.0°C into steam at 117.0°C. (Assume that the H2O produced in the combustion reaction is steam rather than liquid water.)
Calculate the work done in the isothermal reversible expansion of one mole of CH4 (g) from 1.00 dm3 to 10.00 dm3 at 300 K. Treat methane as a van der Waals gas. The van der Waals gas constants for methane are: a=2.3026 dm6⋅bar⋅mol−2 and b=0.043067 dm..
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