I'm in the northeast so don't have much experience with evap coolers.
To conserve water and control humidity, I want to cool enough to hit the required dry-bulb temperature only and not over saturate the air. What types of control strategies are available?
Can reducing water flow over the pad...
On a 30 Ton water cooled chiller installation, cut sheet of the unit shows chilled water inlet/outlet opposite of what's labeled on the actual unit. Not sure whether the installation is correct or not.
The unit has brazed plate heat exchangers. Since it's refrigerant to water, will there be any...
Hi,
Has anyone used PEX tubing for distribution of 200 degree heating water to baseboards, not just radiant floor heat.
Is PEX rated for this application and are there any code limitation to it's usage?
Thank you.
A company has multiple training room with electrified movable furniture. The existing rooms uses rigid conduits to bring power to central locations, then uses flexible conduits for the final few feet. This gives them some flexibility to rearrange the rooms as needed.
I'm designing a new office...
The owner is used to rehabing 3 story brownstones with this method. I'm calling for 50 CFM ceiling fans with 0.55" static and backdraft dampers. Even without a ventilator, I think the static combined with stack effect should be enough to push air out, right?
MagicJS
Hi, I'm working on a five story residential building. For bathroom exhaust, the client asked me to use ceiling mounted exhaust fans in bathrooms and a wind powered turbine ventilator on the roof instead of a roof fan. The shaft are straight runs, a few offsets on top floor.
Has anyone else done...
Hi, I'm hoping someone here can clarify NFPA 54 requirement for outdoor combustion air for me.
Section 8.3.3 calls for openings in boiler room enclosure of 1 sq.in./2000,3000,4000 Btu/hr of input depending on method. The openings shall communicate directly, or by ducts, with the outdoors or...
Hi, what's a good reference (online or off) for boiler fuel oil piping layout. Mainly I need to know when it's ok to use only burner mounted pumps without a recirculating loop. I've read ASHRAE fundamentals and it just gives you pipe sizing & a recirculating system schematic. I would prefer a...
Can a three way control valve between supply & return headers also be used as a differential bypass?
Do you need custom controls or does someone make a valve like that?
Thanks.
I am using three boilers for perimeter heating only, and the PTACs will have two way motorized valves. Can partial load conditions cause inadequate flow through the boilers or is a pressure differential valve be enough to maintain minimum flow?
Hi, I'm designing heating for a 12 story residential building with PTAC units @ 400 GPM & 180F. The developer does not want to use primary-secondary pumping. I know the benefits in control and design by using primary-secondary, but is it absolutely required. Will not using it a cause problems in...
A collegue told me that if I want to use thermally powered VAV diffusers, I need to design special dust distribution system.
I thought dust accumulation is caused by dumping at low flow conditions by diffusers not designed for VAV. Is there a particular reason VAV diffusers worsen this...
