[Bldg-sim] FW:

[Chien Si Harriman]

________________________________

From: Chien Si Harriman
Sent: Thu 21/02/2008 21:46
To: bldg-sim at lists.onebuilding.org
Subject: 


Hi there-
 
I've been tasked with modeling a parallel fan powered box as my baseline system for ASHRAE 90.1 Appendix G, and basically I am wondering if there is anyone who knows of modeling guidelines for that FPB?  I have the capability of modeling any sort of conditions I would like, so I can vary the flow rate of the recirc air, the control sequencing of the fan-assist, and even whether that fan is variable volume or constant volume.
 
I can't find any guidelines that exist anywhere on this topic in ASHRAE 90.1, and this is the first time I've had to model it (I've never designed an electrically-heated building before).  Does anyone know whether:
 
1.)  There is a specific ratio for the amount of recirc air to minimum primary air?
2.)  Whether the amount of recirc air should vary (ie-a variable speed fan)?
3.)  You can just use a real FPB with data from a company like Carrier, and just call it a day on the simultion effort?
 
 
 
Any guidance would be really helpful.
 
 
Thanks in advance,
Chien Harriman
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