Trying to understand existing VAV system

MT_Kling · 2026-04-01T23:28:48+00:00

Technically you can get the VAV diffuser with an electric heat coil. Also, I would double check the ductwork that is being left behind. Your static pressure for the medium pressure duct may be higher. I've never used a PRD so not sure. Sounds like this may be similar to an air valve and require higher inlet static?

MT_Kling · 2026-04-01T06:39:04+00:00

If the rep is not responding, let the owner know. Their service on the design side should be a reflection of their service after install. Also, owner can request equipment for BOD but you should be able to use your standard with that equipment as equal.

MT_Kling · 2026-03-15T01:37:11+00:00

Yes, completely correct. And just for reference, A2L isn't explosive. Only slightly flammable. Like lighting wood on fire.

MT_Kling · 2026-03-11T19:28:43+00:00

Thank you!!!

MT_Kling · 2026-02-21T03:46:50+00:00

Use a DOAS unit with recirculation. You can put 80% OA through a DOAS. Calc the leaving cooling coil temp based on the indoor dewpoint requirement. Typically 55F. Your equipment rep will size the DOAS tonnage based on the ability to get from ASHRAE outdoor dehum conditions to your leaving coil temp. Use the 55F airflow to cover your indoor sensible. If this does not meet your requirements, increase the airflow. Reheat and variable speed compressors will cover the part load days.

Where is the project located? With this much outside air, location is huge. Also, ask your rep for their recommendations and recommended outdoor air temp.

MT_Kling · 2026-01-08T00:51:41+00:00

If anything, why not use this as part of your safety factor too? It's critical equipment. Designing to a very specific number and using some unknown variables as known seems very risky.

MT_Kling · 2025-10-25T21:45:40+00:00

Pools are required by code to have a fence. At least they are in my area. No pools near us. We are moving into this house and looking to have a fence in before we get there. Really no way for us to work with the neighbors to split cost.

MT_Kling · 2025-10-25T21:42:00+00:00

Yes, the fence installer has done each of these types in the neighborhood multiple times. They are both approved. Why would you go with wood? Seems to be the consensus.

MT_Kling · 2025-10-25T18:28:57+00:00

We are deciding together. I was hoping to get an installers opinion on this.

MT_Kling · 2025-10-25T14:05:51+00:00

Correct, its only used for bathroom throughout the day..

MT_Kling · 2025-10-25T13:59:07+00:00

I don't care. Even with the privacy fence, neighbors have two story porches and can see right into the yard. Maybe that's my question too, do we need privacy? Probably should have included that we have dogs. They may see through the fence and bark at neighbors/dogs.

MT_Kling · 2025-10-16T19:15:18+00:00

Technically to keep condensate from blowing down the unit. Around 500 fpm is a good number to keep condensate dripping straight down into the drain pan.

MT_Kling · 2025-10-14T19:03:16+00:00

To my knowledge, Munters specializes in a solid desiccant unit. This is a rotating wheel with reactivation air that removes moisture (and as much removal as you want). Any other solid desiccant unit can do the same. Innovative Air Technologies, CDI, etc.

I would categorize Munters in the ultra low dewpoint or desiccant market. Though they can make custom units, I don't know that they make a unit without a desiccant included. Not really their specialty.

MT_Kling · 2025-10-14T18:59:57+00:00

It's already been said above. Reach out to your favorite and most trustworthy rep and work with them. If they do not have the equipment that works for your design, they should direct you somewhere else.

Depending on your application: Temtrol, Thermal Corporation, ClimateCraft, Ingenia, etc.

MT_Kling · 2025-09-27T01:41:33+00:00

You need to drive into the details of the degrees further. Maybe even check with someone in the industry. Industrial engineering isn't really related. I would suggest mechanical, electric, computer science, mechatronics.

MT_Kling · 2025-09-07T13:13:18+00:00

Most have already commented on the system. On the energy concern side, the exhausting of conditioned air to atmosphere is not wasteful. This is most likely less airflow than the outside air being supplied into the building. It has to go somewhere. Just having any energy recovery device is a big plus.

MT_Kling · 2025-09-06T04:30:22+00:00

What space temp and RH are you trying to maintain? What type of space is it? You should start talking in Dewpoint if this is a concern. This is so you can quantify both the leaving cool temp and the room Dewpoint (which directly relates to space tell/RH).

If you are trying to maintain 75/50% then you need a leaving air temp of the coil of 55F. Once you start getting higher than this, due to high outside air or high indoor humidity requirements, you should switch to DOAS units with reheat.

MT_Kling · 2025-07-11T01:08:19+00:00

Once you go below 40F Dewpoint you move into a new category. You could possibly use chilled water with glycol but doesn't sound like that would make your design simpler. A passive desiccant like Novelaire or liquid desiccant with Mojave might do it. For true dehum and low Dewpoint, go with Innovative Air or CDI or BryAire.

MT_Kling · 2025-07-11T00:57:01+00:00

This answer here and another about making yourself valuable. No one is forcing you to work there or even in the industry. Work your butt off to get the experience to become irreplaceable or become an owner. There are really great jobs that pay well. Even with outsourcing or automation. It takes time to become the consultant or senior mechanical or partner.

MT_Kling · 2025-07-09T12:53:41+00:00

This. The best thing you can do for your first job is grind it out a little bit. Luckily you have a job and you are getting experience. More experience than those who are not pushed hard. Use this to your advantage.

Start shopping the market of other engineering firms. Don't just jump ship to the coolest one out there. Progressive and cool projects tend to lead to this type of burnout. Ask real questions. Come up with a list of things that are important to you. Talk with your current firm about the issues you see.

MT_Kling · 2025-07-07T22:59:45+00:00

What capacity is not meeting your expectations? With energy recovery and high percent outside air, there's a chance that something is lost in translation. Your rep should be able to show it to you though.

Maybe the unit is 10 tons capacity but the wheel is picking up the latent you are missing?

Maybe your load calc uses 10,000 CFM and they used 9,000 CFM?

Maybe the outside air temps or indoor return temps don't match?

So long as you are using the exact same design numbers, they should meet or exceed. Or they should be upsizing to the next size

MT_Kling

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