Lets give the following scenarios?
a) 5 pumps = 100%, with 1 backup pump at 20%, what is the n value?
b) 2 pumps and 2 backup (all equal size)= n+1 correct?
c) 2 pumps and 1 backup (all equal size)
Thanks
I looked through the forums and they get a lot into software. How do you manually calculate an expansion loop dimensions? Is there something in ASHRAE for this? An Example is 140 degree F water at 300 gpm in a 4" Black steel sch 40 pipe?
Thanks
We have a large hanging hanger door with a large shaft that runs the length of the door. The motors are attached at the top and pull of the 3 pieces of the hanger door together using the pulley and wire system. What material do you think the shaft should be considering the site is about 1 mile...
Has anyone done a project on Plume Abatement for Cooling Towers? What is the best way of doing this? As of right now I don't have access to hot water at the site. Would I need to put a boiler on the site for this? Is there any other energy efficient way of doing this?
Does anyone have any...
We have a shop where they teach people to work on automobiles. It uses a swamp cooler for cooling and they say it gets really warm in there. We are thinking of installing an air conditioning unit but are wondering if they would just fight each other since one humidifies and the other...
A lot of concern these days with energy usage in Data Centers. More and more people are looking at rooftop units instead of the CRAC units because of the economizer function. There is also the concern about bringing in outside particles and dirt that can damage the server equipment. What do...
So does anyone know the formula for room pressure in in w.c. as related to CFM in and out of a room? I read that entire thread and it did not make sense. The formula q=2610 gives some huge number. Thanks
A plan checker says I need a detail for fire and fire/smoke dampers, use the SMACNA "Fire Damper & Heat Stop Guide." I need this ASAP, could anyone help me out on this? I really don't feel like buying a book for a detail.
What do you like to use? I've read some articles that say balancing valves or AFLV (Automatic Flow limiting valves or Griswold) may not even be needed. My boss (30 year) veteran loves AFLV. But they use a lot of energy to maintain accuracy. I see now many manufacturers have pressure...
I am little confused on how to size a gas pipe. I understand the length and BTU to get the size. But I don't get what chart to use. As I understand it, Low Pressure gas is <0.5psi and Medium is 0.5psi to 5 psi. If I want to run a medium pressure line from the meter and pressure regulator to...
I don't quite understand pumps. Lets say you have a Vertical Turbine Pump. The pump curve is what you will see basically at the outlet of the pump in terms of pressure and flowrate because there is basically no suction side friction loss. Lets say you have an inline pump that was designed for...
