Advice on designing a closed loop system

[skuntz]

We will be designing a closed loop air circulation system employing a blower. Water is being injected at one point in the system. I have calculated P droops & blower sizing for open systems before. Would it be true that the procedure is the same (Blower needs to make up for P drop though conduit & fittings from outlet to intake?) Is there anything I mauy be missing here?

 

[BigInch]

Its the same, assuming its not much water.

Don't know. What did you leave out of the question?



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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[skuntz]

Well, here's two questions that come to mind.

1. Is it reasonable to assume that the lowest and highest pressure points in the system are the intake & outlet of the blower?

2. How can I force any point in the loop to be at atmospheric pressure?

 

[BigInch]

1. Not necessarily. In a loop with elevation changes the lowest pressure is at the top when the system is static only, after that, if frictional drop in the piping/ducting thereafter exceeds static pressure, the lowest pressure will be at the inlet to the machine, otherwise it could be anywhere between the highest point in the system and the machine's inlet. That depends a lot on what the specific gravity is of your fluid. Since you're talking about blowers, its probably not too significant. So we'll say, it will be at the inlet to the blower.

2. drill a hole in it.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/