# Tag Info

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Solar Mike is correct, but requires more explanation why. The Bernoulli equation is an energy conservation law. The pump is imparting energy on the fluid, therefore, needs to be accounted for as a pressure addition term. When you applied continuity initially, you are assuming the flow is incompressible (correct assumption) with no energy addition between the ...

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There are a lot of ways. To cut cost, reduce your expensive sensors to a bare minimum - probably just measuring what goes into the reactor. Controlling by mass tends to be expensive compared to by volume or pressure. Ideal gas law is your friend here. Pressure times volume is proportional to number of particles times temperature. It's pretty inexpensive ...

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I would suggest separate channels to each set of holes with orifice plates to limit the flow to / from each. That way you can control each set individually. The other solution will be to over-specify the flow rate so that the poorest one is sufficient...

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It will be a next to impossible task to try and analytically predict the number/position/size of the holes in order to have exactly the same flow. Even if you do for a temperature and a set humidity, at different temperatures you might have unacceptable results. If you are really interested in equalising the flows, a better alternative is to use a flow ...

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What you are seeing in the video is a vacuum generator/vacuum ejector/aspirator. Figure 1: Venturi effect (source: wikipedia) It uses the principle of the Venturi effect. I.e. that for steady, incompressible, inviscid when there is an increase of speed there is a drop in static pressure. This is mathematically expressed as: $$p_1-p_2 =\frac{\rho}{2} (v_2^2- ... 1 Normally one would use ASCE 7-10 Wind Load Calculations for leeward roofs.$$p=qGCp−qi(GCpi)  Depending on the location, height, prevalent winds, zone, and some other factors you end up with a range of roughly 10 to 40psf wind pressure (uplift) on leeward side of sloped roofs, which is similar to this case. Here is the link to Skyciv solved example.

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