Your local hospital is considering the following solution options to address the issues of congestion and equipment failures at
their radiography unit, which is a bottleneck in the delivery of emergency services.
Solution Option
Setup costs ($)
Operating costs ($) per service instance
A (outsource all services)
negligible
100
B (upgrade existing equipment)
150,000
75
C (install new machine)
650,000
50
Solution Option
Setup costs ($)
Operating costs ($) per service instance
A (outsource all services)
negligible
100
B (upgrade existing equipment)
150,000
75
C (install new machine)
650,000
50
1 answer:
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Answer:
6.37 inch
Explanation:
Thinking process:
We need to know the flow rate of the fluid through the cross sectional pipe. Let this rate be denoted by Q.
To determine the pressure drop in the pipe:
Using the Bernoulli equation for mass conservation:
thus
The largest pressure drop (P1-P2) will occur with the largest f, which occurs with the smallest Reynolds number, Re or the largest V.
Since the viscosity of the water increases with temperature decrease, we consider coldest case at T = 50⁰F
from the tables
Re= 2.01 × 10⁵
Hence, f = 0.018
Therefore, pressure drop, (P1-P2)/p = 2.70 ft
This occurs at ae presure change of 1.17 psi
Correlating with the chart, we find that the diameter will be D= 0.513
= <u>6.37 in Ans</u>