Static Pressure Help
Static Pressure Help
(OP)
I'm trying to select the correct piece of equipment for a special project.
I have an AT&T mobile computer trailer with 10t of load on it. There are (2) 14" supply connections and (2) 14" return connections.I'm trying to obtain the static pressure of the system based on the ROT of 400cfm per ton= 4000cfm. Using a standard ductulator 14" round @ 2000cfm would= .32 friction and velocity of around 1900. WHAT WOULD MY DUCT STATIC PRESSURE EQUAL ?
I have an AT&T mobile computer trailer with 10t of load on it. There are (2) 14" supply connections and (2) 14" return connections.I'm trying to obtain the static pressure of the system based on the ROT of 400cfm per ton= 4000cfm. Using a standard ductulator 14" round @ 2000cfm would= .32 friction and velocity of around 1900. WHAT WOULD MY DUCT STATIC PRESSURE EQUAL ?





RE: Static Pressure Help
Wall mount A/C unit or Floor mount ??
Your static pressure may be considerable if your equipment is at a remote location and you need to route interconnecting ductwork
RE: Static Pressure Help
RE: Static Pressure Help
1. Distance between your trailer and your remote equipment. If unknown or varies, select worst case scenerio.
2. Material of hose--PVC,metallic, nylon, etc
3. Type of hose--smooth I.D, ribbed helix, etc
Hose supplier should be able to tell you the friction loss (usually per 100 ft)of the hose that you will utilize
RE: Static Pressure Help
The ductulator provides friction loss per 100ft. At 2000CFM in a 14"DIA duct the friction is 0.32" per 100ft of duct.
If your AC equipment is 100ft away and therefore you have 100FT of duct, your duct pressure loss is 0.32"
A more simplified approach is SP = X * 0.32"wg/100FT where X is the length of ductwork(in Ft).
RE: Static Pressure Help
etc.
RE: Static Pressure Help
RE: Static Pressure Help
http://www.smacna-oc.org/bookstore.asp
HVAC Systems - Duct Design
fundamental duct system design manual for commercial and light industrial heating, ventilating and air conditioning systems. System effects for inlets and outlets of fans, noise control in ducts and use of extractors, splinters and dampers are included. New loss coefficients for elbows with 45-degree throats on square and radius heels and radius throats with square heels. Losses compare favorably with elbows with double wall turning vanes in several cases. Structured to offer the designer options in energy-efficient design methods, materials and construction. Includes soft metrics.
348 pages, 3rd Ed., 1990
List Price: $177.00
Product: 1208
RE: Static Pressure Help