3.) Product with Cp = 0.75 Btu/lb°F is flowing at a rate of 3300 lb/h and has to be cooled from 221°F to 160°F. ? Cooling water at 60°F at a mass flow rate of 10,000 lb/h is used. ? The overall U of the heat exchanger is 115 Btu/h ft2 °F. Calculate the outlet water temperature (will be the same for both) ____________________ and the heat exchanger area for: A co-current flow shell-and-tube heat exchanger. ____________________ A counter-current flow shell-and-tube heat exchanger. __________________

Q: Does chainfolding occur in polystyrene? Please explain.

Q: If a plastic can be recycled, what is its functionality?

Consider two-dimensional incompressible plane viscous flow between parallel plates a distance 2h apart, with the origin along the centerline. The plates are very wide and very long, so that the flow is essentially axial. The present case is where the upper plate moves at velocity V but there is no pressure gradient. Neglect gravity effects. Determine the velocity profile for this flow.

A four-cylinder four-stroke engine is operating at a bmep of 2 bar. The pressure at inlet valve closure is 0.37 bar, and the fmep is 0.8 bar. Assuming that the engine gross indicated efficiency is unchanged, verify that disablement of the valves on two cylinders would reduce the fuel consumption by about 13 per cent compared with about an 8 per cent fuel saving if the fuel was not supplied to two cylinders. Assume that the gross imep is proportional to the pressure at inlet valve closure, and that the gross indicated efficiency is constant. State any additional assumptions that you make. By means of p–V diagram sketches, explain why disabling only the inlet or exhaust valves would have a fuel economy benefit comparable to fuel disablement to two cylinders.

Describe the differences in valve timing on a naturally aspirated diesel engine, a turbocharged diesel engine, and a high-performance petrol engine.

Two possible overhead valve combustion chambers are being considered, the first has two valves and the second design has four valves per cylinder. The diameter of the inlet valve is 23 mm for the first design and 18.5 mm for the second design. If the second design is adopted, show that the total valve perimeter is increased by 60.8 per cent. If the valve lift is restricted to the same fraction of valve diameter, calculate the increase in flow area. What are the additional benefits in using four valves per cylinder?

The spiral of Archimedes is a curve described in polar coordinates by the equation ?? = ???? where ?? is the distance of a point from the origin, and ?? is the angle of the point in radians with respect to the positive x-axis. Write an m-file to create a plot of the spiral of Archimedes using 1000 points for 0 ? ?? ? 6?? ?????? when k = 0.5. Be sure to include a title, axis labels, and grid on the plot. Hint: use the command axis equal.

what is the slip plane for the lomer Cottrell barrier formed by combining the (a/2)[-110] on (111) with the (a/2)[101] on (1-1-1)

explain the differences between E and S glasses

13.0 (20 pts)    An electroplating process will be used to coat the exterior surface of a 160 mm diameter x 1.5 meter long cylinder with silver. Determine the time in minutes to electroplate silver to a thickness of 0.06 mm if the plating current is 15 amps.

A W8 3 31 rolled-steel shape is used for a column of 21-ft effective
length. Using allowable stress design, determine the allowable
centric load if the yield strength of the grade of steel used is
(a) sigma Y = 36 ksi
(b) sigma Y = 50 ksi.

Use E = 29 * 10 ^6 Psi

Using the Faraday equation. What current and time are needed to plate a 1 mm thick layer of copper onto an object with a surface area of 0.1m2 ? The density of copper is 8940 kg/m3 , its atomic weight is M = 63.5 kg/kmol and copper ions have a valence of z = 2.