A 25 MGD (million gallons per day) surface water treatment plant has a rapid mixer tank that is square and 7' deep. The regulations for this plant specify a minimum mixing gradient of G = 800 s-1, and the minimum tank detention time for winter (T = 10 C) is 40 s. The dynamic viscosity is 0.001307 N s m². Determine the horsepower (HP) needed for an electric motor with 85% efficiency (n). Hints: ⚫ find the volume given Q and t; • once you find the power required to mix, divide it by the efficiency to find the power needed for the motor.
A 25 MGD (million gallons per day) surface water treatment plant has a rapid mixer tank that is square and 7' deep. The regulations for this plant specify a minimum mixing gradient of G = 800 s-1, and the minimum tank detention time for winter (T = 10 C) is 40 s. The dynamic viscosity is 0.001307 N s m². Determine the horsepower (HP) needed for an electric motor with 85% efficiency (n). Hints: ⚫ find the volume given Q and t; • once you find the power required to mix, divide it by the efficiency to find the power needed for the motor.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Problem
A 25 MGD (million gallons per day) surface water treatment plant has a rapid mixer
tank that is square and 7' deep. The regulations for this plant specify a minimum
mixing gradient of G = 800 s-1, and the minimum tank detention time for winter (T
10 C) is 40 s. The dynamic viscosity is 0.001307 N s m². Determine the horsepower
(HP) needed for an electric motor with 85% efficiency (n).
Hints:
•
•
find the volume given Q and t;
=
once you find the power required to mix, divide it by the efficiency to find the
power needed for the motor.
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