Environmental control 4. Using following data to the figure bellow Duct AB 12” x
ID: 1843262 • Letter: E
Question
Environmental control
4. Using following data to the figure bellow
Duct AB 12” x 25”
Duct BF 9” x 13”
Pressure drop across Boot F + diffuser = 0.048 in-wg.
Duct BCDE 12” x 18”
Loss coefficient for main branch of T: 0.08
Pressure drop across Boot E + diffuser = 0.024 in-wg
Duct CGH 10” x 12”
Pressure drop across Boot H + diffuser: 0.030 in-wg.
a). Correct the air flow velocity in line AB.
b). Estimate the pressure drop between the fan and the exit of diffuser F.
c). Estimate the pressure drop between the fan and the exit of diffuser E.
d). Assuming that the pressure drop along duct AB is 0.08 in-wg, calculate the hydraulic diameter of the 12” by 25” duct, as compared with the equivalent diameter. Then, using the hydraulic diameter and the pressure drop, estimate fD , for duct AB.
e). Suppose your largest estimated pressure drop was 0.265 in-wg, and your estimated pressure drop at the exit of diffuser H was 0.220 in-wg, and the fan you selected was capable of supplying more than 2900 CFM while controlling the static pressure at branch C, so that it is the same (0.160 in-wg, above local static pressure) over the flow rate change. If the equivalent length of branch CGH is 43’, and, to a first approximation, you ca assume that the equivalent length doesn’t change appreciably with varying duct flow rates, estimate the actual flow rate out diffuser H.
* use any website (engineering toolbox to calculate)
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