Recent content by Antifed

Something I used in a laboratory exhaust energy recovery design was from HPT (heat pipe technology).

Hi! Would you mind clarifying something for me? Are you converting a system that supplies chilled glycol to terminal units / equipment to one that will supply straight chilled water to those end point devices? Are you converting from an air cooled chiller to a water cooled chiller? Are...

I'd been taught to account for the extremes (i.e., assume the equipment load is not there to help you with heating). In reality, you heating mode may never turn on, but it is there if you need it.

Which edition of the standard are you working with? I can check the guide book to see if ASHRAE has weighed in on this. If the offices are small compared to the laboratories AND they and the laboratories are ventilated from the same unit, I'd likely just call the whole thing a lab and be done...

Hi, Please forgive my peppering you with questions. Just for clarification, the existing set up is a compressor chiller, correct? As far as the buffer tank goes, and if you need it, what is your system volume and how much buffer does your Daikin require? Is system currently variable...

See the following link for how your fan performance will change depending on your system's characteristics: https://integracontrols.com/fan-curves-explained/ Please see the below image for an illustration of what Snickster wrote.

I highly recommend reaching out to CDS support for help in getting this set up. There may not be a dissect way to model your set up, but there could be ways to manipulate the system set up to approximate what you are trying to do. Also, version 7 of the software just came out so you may want to...

I need to find out what they are putting into the system--thanks!

It is a drain line for seal leaks or condensate.

Maintenance certainly is lacking. The usual problem of building facilities and not funding/staffing up to keep them going.

Hello, I was on a site visit the other day and came across this Armstrong Pump in the secondary side of a heating hot water system. There are no corrosive chemicals in the room nor anything outside of the boiler room that could be drawn in from the combustion air louvers. The maintenance...

Hello, How did you obtain the actual heat gain? Is that from the manufacturer's catalogue? My old (2001) ASHRAE Fundamentals Book shows the instantaneous heat gain from a 15-hp motor as 44,400-btuh based on F_um=1.0 and F_lm=1.0, with the motor and driven equipment being located within the...

I've seen 0.08"/100' used for the distribution system and 0.1"/100' for downstream of the VAV box. What is the pressure drop you are seeing and what is it in the grand scheme of things? The 0.1"/100-ft is an equal friction value that, at one time, was based on a good balance based on economics...

ProcessHVAC, the unit would be more accurately described as a dedicated ventilation and dehumidification unit. I call it DOAS because the unit is the dedicated source of fresh air for the space. The recirculated air provides the extra volume needed to dehumidify the zones. I ran into an issue...