Lilliput1,
What we plan to control is cooling air, which is 100% outside air in an industrial facility. A space thermostat will dictate fan speed, in wintertime, to save on heating bill. Process is not affected.
Thanks for comments.
I have an existing 4000-cfm belt-driven process roof exhaust fan with a 3/4-hp electric motor. I am considering to install a VFD to control the spped of this motor.
Will this cause an undue hardship opn the motor?
lilliput1,
Thank you for your response. You are absolutely right. Opening the doors against pressures above 0.25" wc will be a problem. I'll have to coordinate special hardware requirements with the architect.
Regards...
quark,
The facility design is in embryo stages; building room layout is changing daily, and process functions are evolving as we speak, etc. All I have for the ventilation system at the present time is a concept perceived from the client's requirements. Room exhaust duct velocity is required to...
quark,
1.5" wc is simply a result of adding 0.25" wc for each room in the chain of rooms based on the client's criterion of 0.25" wc for the first room, to which clean air is required to be supplied. This is subject to change (it can be higher or lower, depending on how the rooms in one chain...
dxla,
I have a couple of questions:
1. Is any of your category 1 or 2 rooms connected to a 3 room with a door in the common wall?
2. What did you mean with your last sentence, "Our pressures are about the same."?
Regards...
lindalee
billyq & dxla,
Your suggestions have merit; I will study the effects of the individual supplies and exhausts for individual rooms as much as possible, while considering the client's concerns for cross contamination. Thanks for your thoughts.
Regards...
lindalee
billyq,
Ducting the exhaust from each room directly; i.e, have a common exhaust duct with a branch take off to each room may not be allowed. Rooms with the highest potential for contamination are only accessed thru airlocks with as high as 55 air changes per hour required. We are told to bring...
quark,
1.5" wc will be required in the last room in the chain because that is where the building exhaust fan draws air, and there may be 3-6 rooms in the chain. I anticipate the pressure to be this high to be able to overcome pressure losses in the transfer openings or the inter-connecting...
At a facility, where all rooms are required to be maintained at varying negative pressures, I need to come up with a ventilation system design to confine contamination and to control room temperatures. This is a push-pull cascade airflow system; i.e., building supply fan delivers 100% outside...
My company has been using the Trane Trace 700 load and the Energy Analysis programs for HVAC work. A recent client asked us if these two programs have been verified and validated (VV). I would appreciate knowing if anyone has done VV on these programs.
