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A shell and tube heat exchanger is to be used in a corrosive service. If carbon steel tubes are used, the cost of the exchanger is estimated to be $160,000, and it is expected that the exchanger will need to be replaced after two years. If stainless steel tubes are used, the service life will be increased to five years, but the cost increases to $400,000. If the cost of capital is 15%, which option should be selected?
gold has a face centered cubic crystal structure where there are four atoms per unit cell.below is a calculated xrd
2. Alcohol is a diuretic agent, which increases urine production by reducing water reabsorption. Normal rate of water reabsorption is about 124 ml/min. Assume that the effect of alcohol on water reabsorption (in ml/min) is given by the following equa..
The helicopter can produce a maximum downward air speed ( v = 24 m/s ) in a slipstream of a diameter ( D = 9 m). Knowing that the weight of the helicopter and the crew is ( 15 kN ) and assuming air density rho = 1.21 kg/m^3 ), determine the maximu..
5. A patient is placed on a kidney dialysis unit three times a week. The dialyzer has a membrane area of 1 m2 and is operated in a countercurrent mode. The blood flow rate is 200 ml/min and the dialysate flow rate is 500 ml/min. Membrane permeability..
What is the monetary value of the information from a consumer survey to the venture capital company in this case? (ie what is the maximum that they should spend on a consumer survey)?
For a gas flow rate of 100,000 m3 /h, at the reactor conditions, determine how many cyclones operating in parallel are needed and design a suitable cyclone. Estimate the size distribution of the particles entering the filters.
Why is it important - where does galvanising fit into possible corrosion protection strategies?)
Why fluids are important in chemical engineering - enormous number of materials normally exist as gases or liquids, or can be transformed into such phase and explain systematic description of change in fluid systems, mechanical change
Compare MACRS depreciation and straight-line depreciation: based solely on the tax effects, which depreciation method (SL or MACRS) would yield a higher net present value for the project?
Which do you think would be the greater health hazard: the release of a radioactive nuclide of Sr or a radioactive nuclide of Xe into the environment? Assume the amount of radioactivity is the same in each case.
List the formulas of three soluble bromide salts and three insoluble bromide salts. Do the same exercise for sulfate salts, hydroxide salts, and phosphate salts (list three soluble salts and three insoluble salts).
Your company has two mixed reactors of unequal size for producing a specified product formed by homogeneous first order reaction. How these reactors should be connected to achieve a maximum production rate.
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