Can anyone tell me where I could find information on CO2 pipe sizing? More specifically gaseous CO2? I have a dry ice production facility that is fed liquid CO2 to the ice production. I was able to calculate the GPM of this based on the mass flow rate requirement on the machines and the...
Can anyone tell me what the industry standard is for a piping material for these fluids. All of the piping will be filed painted so I immediately thought schedule 40 black steel. However, the chassis grease pump is a Fire Ball 300 (50:1 ratio) model 226013. The manufacturers specifications...
I received a call from a school district we do quite a bit of work at about replacing their existing pumps within their bus yard. The pumps are dated and are in need of replacement. I've never done design/permit drawings for something like this but I am sure our firm is capable of this. This...
Hello everyone,
After working in the HVAC industry the last 14 years after graduating with BSME I'm am thinking of pursuing the PE. The first hurdle however will be the FE. In all honesty I am extremely nervous and intimidated since school was always a struggle for me and I haven't opened a...
It's hard to say how the smoke is getting into the adjacent unit. The place is set-up with 24/7 exhaust air in the toilet and main living area. Make-up air is provided at each end of the hallway and I guess the engineer who designed was relying on cracks around the doors for make-up air to...
Guys,
I have a client that operates a large condominium complex and he is getting complaints about marijuana odors migrating from 1 unit into the adjacent unit. I am in the process of analyzing the air flow and determining if the exhaust system is up to par and exhausting the required rates...
Very interesting. We have specified UV germicidal lamps in air handling equipment years ago but since that only targets the air moving past the light it was thought that ionization was a better approach since we are producing ions in the AHUs supply air system and distributing them into the...
I keep hearing about this and keep getting lost in article after article but is there any new standard people are using? Our approach recently has been to reduce OA and provide bi-polar ionization along with higher MERV filters in the air handling equipment. Seems like increasing OA is going...
I'm a design engineer using light commercial furances and I have a situation that would really be a clean layout if I can run the ductwork like this. I know all too well about system effect and have been to many labs where they actual show dP and CFM by applying various elbows to the outlets of...
Yes BronYrAur! This is exactly what I am talking about. Seeing that the air goes through furnace and cooling coil then about 4-5' of straight duct before the 90 I should be ok. There is nothing in the I&M that prevents you from ducting these whichever way you want. I just know from past...
So since the supply fan is on the bottom of the unit and the air runs through the furnace and the cooling coil I should have fairly straight flow leaving the unit which wouldn't be bad for a 90 degree mitre with vanes going back over itself which is normally frowned upon.
For Rheem residential style furnace there is no such thing as breaking the fans back correct? Fan is located at the bottom so air needs to travel through furnace element then DX coil and then into the duct so it should be fairly laminar flow leaving the DX coil at which point I want to 90 after...
Thanks. The client wants the room a tad cooler than normal so I am thinking 65-68 degrees. I can do a fan for 700 cfm and a make-up air unit to discharge into the space at 65 degrees and only run this system when they are embalming and then install a ductless unit on the wall for unoccupied...
Can anyone share they approach for a room of this type. ASHRAE requires 10-15 ACs per hour so I am looking at 600 cfm. I'm thinking 100% OA with all of the Covid concerns but not sure how to handle unoccupied situations. Are ERVs a safe approach without cross contamination to the OA? Do I go...
I have a project where they powder coat in a 12'x10'x8'room. There is only 1 worker and they warm small parts in a oven then dip in the powder that is in a pot and then a 2nd oven bakes the part. It is not a spray booth application. I cannot find anywhere in any ASHRAE literature where they...
The existing system is DX. I figured the 2-ton unit would be starved by the ERV and we wouldn't have enough cfm/ton and could possibly freeze the supplemental units cooling coil.
