Engineering, 20.08.2019 17:10 LordBooming
Alaundry uses a boiler to heat up cold fresh water from 10°c to 65 c at a flow rate of 5kg/sec. the laundry discards used water into the sewer where the water temperature is now 60°c. an engineer decides to install a shell-and-tube heat exchanger to use the discarded water exiting the laundry to preheat the fresh water. the heat exchanger has one shell pass and 6 tube passes. the surface area of the thin walled tubes is 100m2 and the overall heat transfer coefficient for the surface is 1000w/m2.c (a) determine the ntu (number of transfer units) that can be achieved by the new setup. (b) determine what % of the heating is contributed by the heat exchanger and what is contributed by the gas boiler.
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Engineering, 04.07.2019 18:10
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
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Engineering, 04.07.2019 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
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Alaundry uses a boiler to heat up cold fresh water from 10°c to 65 c at a flow rate of 5kg/sec. the...
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