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Pressure is not uniform at different area, that's the problem for accurately calculating. I didn't consider the dynamic effect, but it would be stable finally like open system, although some fluctuation may be left. System design/optimization for Airplane Environment Control System and...

This software is not a 3-d CFD software which usually used to simulate a PART as ducts, fan flow, room air flow as so on, it is used to simulate fluid SYSTEM like duct network, hvac system..., they call it a 1-d simulate software, for system level simulation. System design/optimization for...

In fact this can not be calculated precisely, because each loss parts are too much close, it is hard to calculate interaction loss between these parts. I calculated the max flow speed which is about 25m/s, the main losses are at the parts of tee and expansion, use a approximate part to estimate...

Suppose we have this system, it has a cooler somewhere to keep system stable. by initial, fan not started, we can aerate it to positive pressure, or extract to get a negative pressure, even leave a little hole at fan inlet to keep constant inlet pressure like liquid loop system(ignore this...

I have tools and calculated this before, air temperature in the loop rised rapidly so I have to terminate the calculatiing, it needs a HX to balance temperature. Fan inlet has the lowest pressure, fan outlet has the highest in the loop, to make sure the exactly pressure value, I think it needs...

In my view the equation is a conservation law and just apply for a total process, not a short transient stage, at this stage an extra variable item should be added for reckoning in extra energy consumption which used for kinetic energy increments of liquid and motor, and this item becomes to...