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A chemical plant uses a tube-within-a-tube counterflow heat exchanger to heat air with the use of steam. During steady state operation, the air flows into the exchanger at a rate of 5,000 kg/h and a temperature of 27C and exits at a temperature 20C higher. The air behaves like an ideal gas and its thermodynamic properties are listed in one of the tables in the textbook. Steam enters the heat exchanger as saturated vapor at a pressure of 10^5 N/m2 and exits with a specific enthalpy of 2,223.86 kJ/kg at the same pressure. There is negligible heat transfer between the heat exchanger and its surroundings and no kinetic and potential energy effects. Calculate (a) The mass flow rate of the steam in kg/h; and (b) The quality of the steam exiting the heat exchanger.
If the BOD5 of the river below the mill outfall must not exceed 5 mg/L, what percent removal of organic matter (BOD5) is required by the mill to meet this requirement?
Compare the reactor volume required to achieve 95% efficiency for Completely Mixed Flow Reactor (CMFR) and a Plug Flow Reactor (PFR) for the following conditions. steady-state, first-order reaction, flow rate = 14m3 / day.
An engineering student is driving on a level roadway and sees a construction sign 180 m ahead in the middle of the roadway. The student strikes the sign at 56 kph. If the student was traveling at 90 kph when the sign was first spotted, what was th..
AGNO 3 is added to a solution containing 0.001 mol Cl - amd 0.001 mol Br- per liter.What are the concentrations of Cl - and Br- remaining when AgCl just begins to precipitate?
Determine the critical depth in a trapezoidal channel with a 20 foot bottom width and 3:1 (H:V) side slopes if the Q = 1000cfs.
The elastic ball bounces down a flight of rigid stairs. Determine the height h of the steps if all the trajectories between successive steps are identical. Use e=0.85 and the initial velocity 6 m/s.neglect friction.(teta=70 degrees)
The supplier says it would prefer to sell the company a 65% NaOH solution and the company says the water content is immaterial as long as the equivalent costs are the same including freight.
a job requires excavating and hauling 500 cyds (in situ) of sandy soil. in your posession is an excavator and a dump truck (capacity 30 cyds loose) the dump truck has a round trip travel time of 5 mins and 45 secs to the dump site and back.
A four lane freeway (two lanes in each direction) operates at capacity during the peak hour. It has 11-ft lanes, 4-ft shoulders, and there are three ramps within three miles upstream of the segment midpoint and four ramps within three miles downst..
The gases are expanded to 140 kPa with a reversible adiabatic process. Calculate the work done by the gases, assuming they can be approximated by air with constant specific heats.
A large rock became visible to a driver at a distance of 175 ft. Assuming a perception-reaction time of 0.8s, an initial speed of 42 mph, a coefficient of friction equal to 0.5, and a level roadway, calculate the speed at impact.
Draw a plan of a typical strip mine showing all operational features and equipment and why is the working slope of an open pit usually much flatter than the final slope?
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