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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...

Hello, Thanks for your reply. The beams are supplied with 57-degF water, but the fan coils and blower coils are supplied with 44-F water. The fan/blower coil spaces are provided with dehumidified air that is designed to account for the latent load. After subsequent discussions with my...

Hello, I searched through existing posts and did not find a post regarding my question (though that doesn't mean that I searched very well) so please forgive me if this question has been asked and answered. If it has, please direct me to the thread. We designed a a building in climate zone...

Hello, The best thing to do is to obtain an equipment load from your customer. We've done data centers where we've obtained the customer's equipment data and were able to design to it. We've also used rules of thumb based on the type of equipment that is going in a rack. For example, for...

Thank you very much!

Hello, Does anyone have a copy of the 2001 edition of ASHRAE 90.1-IP? If you do, would you please tell me the envelope requirements from Chapter 5 for climate zone 4A? We are working on a project for which I need to know the non-residential construction​ R & U values for roofs. It is to...

The Natatorium is on a separate system within the simulation as is its evaporation rate; though I am waiting on the client to tell me what temperature they keep the water so that I can set a room temp setpoint and add in the convective cooling load from the pool. The fitness center is on its...

Thank you all very much. As of last night, I am thinking that a chilled water system with decentralized units (e.g. fan coils/blower coils) to serve each space with DOASs to aid in dehumidification and to provide the ventilation air flow. There are various restrictions on funding, funding...

Not sure if this document would be useful to you (in case you don't have it).https://files.engineering.com/getfile.aspx?folder=a6429cc4-b045-4a70-96e1-ab60c1d9d933&file=17DA-3SS.pdf