AHU general questions
AHU general questions
(OP)
Hi everybody,
I need to get a rough idea about how many AHUs I will need to condition a building.
This building will be a museum with three main exhibition areas plus a number of coffee shops, resturant and offices.
Do you know if there is a guide or something like that to figure out how many AHUs and how big they need to be considering some parameters such as use of the room, floor area, volume ecc ecc.
Moreover, would you say it is a good idea to consider a AHU associated to each exhibition area??
I m sorry for the poor formulation of the question but actually I dont have any idea where to start from.
Also any further questions will be appreciate so I can look at the problem in a more complete way.
Thank you for your help.
I need to get a rough idea about how many AHUs I will need to condition a building.
This building will be a museum with three main exhibition areas plus a number of coffee shops, resturant and offices.
Do you know if there is a guide or something like that to figure out how many AHUs and how big they need to be considering some parameters such as use of the room, floor area, volume ecc ecc.
Moreover, would you say it is a good idea to consider a AHU associated to each exhibition area??
I m sorry for the poor formulation of the question but actually I dont have any idea where to start from.
Also any further questions will be appreciate so I can look at the problem in a more complete way.
Thank you for your help.





RE: AHU general questions
2. You can also group by use, ie, are the environmental requirements different for different display areas? Separate AHU's by environmental requirements.
3. Hire a Mechanical Engineer as what you are proposing is a lot less simple than it appears.
RE: AHU general questions
I know this is going a lot harder than I though.
For environmental requirements, do you mean temperature, RH inside the rooms?
RE: AHU general questions
- Office space is around 0.75 to 1 cfm/sf
- Restaurants, to play it safe will be 1.0 - 1.5 cfm/sf
- About 350-400 cfm per ton.
- To give you an idea 20,000 cfm (‘high pressure’ VAV supply) will require about a 42x30 duct.
- 50k is 80x40 (these duct sizes are just for an idea, you really need to break out the Ductulator to get all the size choices. I assumed 0.25 in wg loss per 100 ft or 2500 ft/min whichever causes the bigger duct).
- What your space requirements because these units will get very large. For modular type units the cross section is maintained at a maximum of 500 ft/min.
Hope this gets you moving in the right direction.
Ps 'Environmental requirements' encompasses everything. Humidity, temperature, occupancy, hours of operation, space usage, etc...
RE: AHU general questions
Seriously though note that the earlier you get serious proffesional advice on plant layouts, space planning, ducting etc, the easier it will be for you in the long run.
RE: AHU general questions
Marcoh thank you for your offer but I work in engineering company so I think they gave this job to me just as a sort of training process given that I have just started, thank you very much anyway.
RE: AHU general questions
RE: AHU general questions