Recent content by darkvibe

http://www.exhausto.com/ they make a prefab 22" subduct. http://us.exhausto.com/files/pdf/ProductInformation/3932003.pdf

Toronto has a system that uses domestic water (AFTER it bas been treated) to cool a chilled water loop via plate and frame heat exchangers. They ensure a leak in a Hx will not contaminate the water in the domestic system by keeping the pressure higher on the domestic side (per an engineer with...

Is it fan noise or air velocity noise that is causing the problem?

Is the job at a private college or is it a state job like DASNY or SUCF?

Open one of your defined systems and go to the zone components tab. Thats where heating and cooling tstat setpoints are.

I opened it. It looks like more trouble than it's worth to mess with. I don't know why you enter everything in excel first. I measure from a drawing as I input directly into hap and sometimes outline the space and write the square footage on the drawing for reference. Haven't had a problem.

I've been there before. I think you're probably on the hook to provide them.

Wattmaster makes a cheap system. I think the line is called orion controls. I've used it one one job (with an aaon rooftop and VAV's). i havent gotten any complaints about it. I dont know what else that offer besides rooftop and vav control. Might be worth some research...

Never had that issue come up but why couldn't you interlock the fan so it shuts off if a sprinkler trips?

I spec insulation on them also. Both for noise and condensation issues.

I use 300W for computers in a dorm or office and not a high end workstation with large monitor and large power supply. I use 500W for them. ASHRAE numbers are really low so i just guessed.

The ventilation of multiple spaces calculation in ashrae will combine those two OA ratios and set the outside air requirement at your unit.

Just some random toughts from reading this.... Don't forget a duct leakage test in the specs. Heavy and wet sawdust has a transport velocity of 4000-4500 fps in the handbook. Ive done similar systems and used a blast gate in each drop and a bleed-in damper at the end of the header.

If you have a DDC system you can use multiple thermostats and control all the units based on the worst case/average temperature in the zone.

Look at ASHRAE 62 addendum n for new ventilation requirements.