The problem of series connection of centrifugal pumps
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Dear experts, I have a question: The problem provides the characteristic curve equation of the centrifugal pump as H=50-0.085Q2, and its pipeline characteristic curve equation as H=20+0.01Q2. What is the flow rate when two pumps with these characteristic curves are connected in series?
For a series connection of centrifugal pumps, the flow rate remains unchanged while the head doubles, that is, 2(50-0.085Q2)=20+0.01Q2
The last edit to this post was made by zshiwei2008 on 2016-8-6 at 11:34. The characteristic curve equation for the pump when connected in series is H=2(50-0.085Q2), while the characteristic curve equation for the pipeline is H=20+0.01Q2. By solving these equations together, the value of Q is found to be 21.08 m3/h
Pro: victory:
Thank you for the answer: victory:
Expert, let me ask you another question. In the answer to question 8 of the afternoon case study section of the 2011 Chemical Engineering exam, Q=1650*2258+（4950-1650）*4.1*（100-0）-4950*4.1*（28-0). Why is 0°C subtracted from both 100°C and 28°C? Thank you! Do you have the real exam questions from 2011?