I would definitely use a centrifugal fan if you are using merv 8 filters. I like the idea of filter pressure differential switch with a light outside the space to notify when filters get dirty. Did you run a load on the space to determine the 400 cfm? Q=1.08cfmdeltaT or Q=all load center...
If you had someone in your office who spoke Spanish, you could possibly call down there and talk to the airport or weather stations who usually keep yearly logs on temps, wind, etc. If not use a similar latitude close to the one you are looking at and use ASHRAE again.
If the insulation is completely surrounding the pipe and an aluminum jacket is used around the pipe with a pipe roller, cold draw would be eliminated because there is no direct contact between the pipe and the pipe support in my opinion.
Go to a fluid dynamics book and research the Bernoulli equation which uses static pressure of two points, velocity pressure of two points, work input, etc. Solve for velocity out and use Q=V X A where A is diameter of pipe and V=velocity out. Q=Flowrate
You are dealing with two different variations of q=mcdeltaT
The water side can be written q=500gpmdeltaT
The air side can be written q(sensible heat)=1.08cfmdeltaT
Set both sides of equation equal to q or
500gpmdeltaT(Water)=1.08cfmdeltaT(Air)
Assuming gpm and cfm are constant,
Changing the...
I did something like this a few years ago at an industrial facility for cooling of people working on the floor and exhausting steam, moisture, etc. I used many motor operated combination adjustable intake louvers at 12" aff. so that air was passing in low everywhere. 3 roof exhausts seems...
If this is a vav job, when the thermostat starts to be satisfied, the air leaving your wall register will not make it to the exterior wall unless you have a minimum setting on your vav box that you know will throw that far. The return air grille should be sized large so that if the door is open...
