Question

you can skip task 1 (3) because its a code in matlab.

Task 1: You were asked to check up the status of the water system. Water at 24 °C is to be pumped from a Lower reservoir with 100 m elevation to another reservoir at a higher elevation 112 m through 150-m-long pipe as shown in Figure (1). The pipe is made of steel, and the diameter ofthe pipe is equal to 30 cm water is to be pumped by a 72% efficient motor-pump combination that draws 33 A of electric current during operation. The minor losses and the head loss in pipe connected between the two reservoirs are considered to be negligible. A. Using Bernoulli's equation, determine the main parameters that have been considered to calculate the pump's head? B. Calculate Reynolds number for the flowing fluid. What is the significance of Reynolds calculation in a previous part? Explain your answer. C. D. Determine the head losses accumulated through the pipe (MATLAB code has to be submitted with your answer sheet). E. If you need to increase the flow rate by replacing the existing pump by two centrifugal pumps in parallel. The new pump has an efficiency of 80% and 20 A of electric current during operation; calculate the input power per each centrifugal pump F. Your manager told you that the head loss is too high and asked to make a new design of the centrifugal pump that will reduce the head loss by 3 m. What are the characteristics of a new pump? p 940 kg/m3 v 10-5 m2s Elevation 112 m LE s150 m -Elevation = 100 m Oil Steel pipe D = 30 cm Figure (1): Pumping Water from one tank to another

Answer 1

Solution Given that Louon elevation ho.. \00m 咪Resen voi Resul voir ttighen elevation h12!12m Diameter ot the pipe 30cm Bu using the Beoi's equation p - 112- loo mag ead

2 Renold' numbon (Re) Pipe Diame te densit of fluid id D 30Cm Re e 15.34 x 0.3