[BLDG-SIM] Zone Fan Ratio

[Varkie Thomas]

How is the Zone-Fan-Ratio (ZFR) determined for Fan Powered Terminal Boxes?  In eQUEST the default for Series FPB is 1.0 and for Parallel it is 0.5.  The definition in the DOE2.2 manual is:
ZFR * Primary CFM = FPB Supply CFM
In the case of a UFAD system with Parallel FPBs the Primary Air Temp is 48F, the FPB Supply Air Temp = 65F and Recirculation Air Temp is 78F.  What is the ZFR?  An increase in ZFR should reduce the energy use?
How would you account for the energy savings using ECM motors.  One suggestion is to reduce the energy use of the fans in PIU boxes by 25%.  The default KW/CFM in eQUEST is 0.00033 kw/cfm.  Reduce this by 25%?


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