Hello:
Can't help but jump in when someone refers to me as a "lofty scholar". Actually, my lab office is in the basement (chamber of doom?).
Not a bad answer from John Aulbach. I agree that Jeff Hirsh would be the one to answer questions about PowerDOE. I'm also a
"barefoot" DOE-2 user who writes his own BDL. Obviously, at some point your going to need to dig into the manual and see what
each fan in your system is and how that compares to what you want. I'm not sure what PowerDOE does.
It is my understanding that DOE-2 can be used to simulate "demand" ventilation, by specifying the CFM/PERSON, which is really
acting like a perfect CO2 controller. The fans and the amount of ventilation would need to be described by the user. Most likely,
looking at some of the hourly outputs for a given day would be helpful in your case.
Jeff
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I'm trying to simulate a variable speed exhaust fan of the type manufactured by Melink. Supposedly, the exhaust will turn on as required based on room temperature and on smoke/CO2 levels. I was thinking to maybe model just a CO2 demand control ventilation system using a minimum outside air schedule. I appreciate your help. I'm still learning PowerDOE, and learning it on my own. Do you know of any colleges that might do distance learning for simulation programs of this type? Again, thanks for any help.
Sincerely,
JP Carioto
Jeff S. Haberl, Ph.D.,
P.E.............................jhaberl@xxxxxxxxxxxx
Associate Professor....................................Office
Ph: 979-845-6507
Department of
Architecture...........................Lab Ph: 979-845-6065
Energy Systems
Laboratory...........................FAX: 979-862-2457
Texas A&M
University..................................77843-3581
College Station, Texas, USA...........................URL:
www-esl.tamu.edu
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-----Original Message-----
From: postman@xxxxxxxx [mailto:postman@xxxxxxxx]On Behalf Of Aulbach, John
Sent: Friday, January 03, 2003 1:55 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] Variable Speed ExhaustGot an idea, but it needs further research. I run DOE-2.1E, and PoweDOE is 2.2, but everything in my version carries forward in intent and philosophy into 2.2.
Chose a SYSTEM (or whatever PowerDOE calls a SYSTEM) that is a VAV system that allows a RETURN-AIR fan. Make that SYSTEM 100% outside air. Therefore both SUPPLY and RETURN FANS are variable flow, and the RETURN FAN essentially becomes an EXHAUST or RELIEF fan.
You then need to tell the fans what controls their speed, which could be temperature, or a schedule for usage (occupied/unoccupied, etc). If your kitchen SUPPLY fan actually exists, it will have a variable flow over its coils. If all air is entrained into the space (NO SUPPLY FAN), simply set the KW/CFM to zero and any coils it contains to ZERO btu capacity to negate any energy usage from a SUPPLY FAN.
By the way, I believe PowerDOE will give you, in the raw DOE2 reports, all fans individually by SYSTEM consumption. The RETURN FAN will be your EXHAUST FAN.
I believe this will give you a variable speed exhaust. I would like my colleagues in DOE2 cyberspace to confirm my suspicions. Jeff Hirsch, Jeff Haberl, and other lofty scholars, do you think this will give this gentleman his answer?
-----Original Message-----
From: HermesPropylaios@xxxxxxx [mailto:HermesPropylaios@xxxxxxx]
Sent: Friday, January 03, 2003 11:03 AM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] Variable Speed Exhaust
Hi all:
I'm trying to model a variable speed exhaust fan in a kitchen for a large hotel in PowerDOE. I'm not sure how to go about it. If anyone could give me some ideas, or if anyone has done this before, I would appreciate it. Thank you.John Carioto
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