Unformatted text preview: the piping is $75 per centimeter of diameter. The
power generated may be sold for $0.08 per kilowatthour.
Find the proper pipe diameter for minimum payback time,
i.e., minimum time for which the power sales will equal
the initial cost of the system.
P6.78 In Fig. P6.78 the connecting pipe is commercial steel 6 cm
in diameter. Estimate the flow rate, in m3/h, if the fluid is
water at 20°C. Which way is the flow? D = 3 cm, L = 5 m, cast iron 200 kPa
gage 15 m
θ P6.72
P6.73 The Moody chart, Fig. 6.13, is best for finding head loss
(or p) when Q, V, d, and L are known. It is awkward for
the third type of problem, finding d when hf (or p) and
Q are known (see Example 6.11). Prepare a modified
Moody chart whose abscissa is independent of d, using as
a parameter nondimensionalized without d, from which
one can immediately read the (dimensionless) ordinate to
find d. Use your chart to solve Example 6.11.
P6.74 In Fig. P6.67 suppose the fluid is gasoline at 20°C and h
90 ft. What commercialsteel pipe diameter is...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.
 Spring '08
 Sakar

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