Hunter RoseFluids ME 3370-002Dr. He4/25/15

Fluids ProjectBackground

In the problem I selected to do my project over there is a pump being used to deliver water through a pipe. In this problem there are four 90 degree elbows and a gate valve included. I will be determining the flow rate both when the valve is completely open and also the percentage of how far the valve must be open for the system to be operating at BEP or the “best efficiency point.” Lastly in this project I will be determining that if BEP holds what the annual energy cost to run the pump will be. This is a significant problem as it will help to determine the percentage of how far the valve needs to be opened in order to be the most cost efficient process. Solving this issue will allow me to determine the recommended placement for the valve when it is being distributed to consumers.

Problem In this problem we will reference the pump described in problem 11.28. A 6.85 inch pump

running at 3500 r/min delivers water at 20 degrees C through 7200 ft. of horizontal 5 inch diameter commercial steel pipe. There are a sharp entrance, sharp exit, four 90 degree elbows, and a gate valve. Estimate,

(a) The flow rate if the valve is wide open (b) The valve closing percentage that causes the pimp to operate at BEP (c) If the condition in part (b) holds continuously for 1 year estimate the energy cost at 10 cents

per kWh

SummaryWe can see from the worked out solution to the problem that the flow rate of the wide open

valve will be about 359 gal/min, we can also see that to operate at BET the valve will need to be closed about 25 percent of the way. The cost to operate this pump in this system would be $12,100 per year. From this information we can make an informed decision on what is the most cost effective method when comparing this pump to others in similar situations. This will allow us to market the most effective and efficient pump possible.