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The heat exchanger consists of 12 m of copper tubing that is 2 cm in diameter with 19 return bends. The flow rate is 3 x 10-4 m3/s. Water enters at 20 C and exits at 80 C. The elevation difference between the entrance and the exit is 0.8 m. Calculate the pump power (in Watts) required to operate the heat exchanger if the pressure at 1 equals the pressure at 2. Use the viscosity corresponding to the average temperature in the heat exchanger.
It is desirable to produce a copper-nickel alloy that has a minimum noncold-worked tensile strength of 390 Mpa and a ductility of at least 40% elongation. Is such an alloy possible If so, what must be its composition
Two tests are taken from the compacted mixture and checked for density. Core 1 had a density of 150 pcf and an air void content of 6.5 %. Core 2 had a density of 151 pcf. What is the air void content of core 2
Three-ply asphalt felt and gravel roof over 2in of insulation board is supported by 18in deep precast reinforced concrete beams with 3ft wide flanges. If insulation weights 3lb/ft 2 and the asphalt roofing weights 5.5lb/ft2, determine the total dea..
On a flexible pavement with a 3 inch hot mix asphalt (HMA) wearing surface, a 6 inch soil cement base and an 8 inch crushed stone subbase, which truck will cause more pavement damage?(Suppose drainage coefficients are 1.0).
What is the concentration of tracer in the reactor 1 h after tracer addition is terminated? The reactor had an initial concentration of tracer of 1.0 mg/L when tracer addition commenced.
you purchased an old machine at the beginning of this year.maintanance on this old machine will be 100$ at the end of this year but is expected to increase by $25 each year after. what is the present worth of five years of the cost of maintanance
Determine the critical load of a round wooden dowel that is 0.9m long and has a diameter of (a) 10mm (b) 15mm. Use E=12GPa
If an aerial photograph is taken with this camera tilted angleA=35° at an altitude 5000ft., calculate for the ground distance of the angular coverage 60°.
The cost to build the motel is estimated at $8,000,000; Value Lodges estimates furnishings for the motel will cost an additional $700,000 and will require replacement every 5 years. Annual operating and maintenance costs for the motel are estima..
The emission rate of radon into the crawl space is reported to be 0.6 pCi/m^2-s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of radon is 1 pCi/L.
Water flows in a 100-m long pipe at 3 m/s. If the water temperature is 20 degrees C, determine the minimum valve-closure time to avoid creating the water-hammer pressures. What is the maximum water-hammer pressure that can occur
What does under-reinforced mean Which is desirable and why How would your Moment-Curvature plot be affected if the amount of tension steel was doubled How would your Moment-Curvature plot from part a be affected if compression steel was added to the..
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