[Equest-users] (no subject)

Grando, John JGrando at cosentini.com
Tue Apr 28 06:08:20 PDT 2009


I have an issue with modeling a Baseline PTAC unit.  When I consult the fan curve in appendix G of ASHRAE 90.1, the fan power for my PTAC system is very high.  I add up all of my PTAC unit's cfm and then apply them to the curve but I am getting a result around  0.000656 kw/cfm.  This also lowers the cooling EIR by a large amount when the overall efficiency is taken into account.  This is a very large amount of energy over one year's time.  I need to simulate the fan power because the heat source is hot water and it will not be accurate if there is no fan power during the winter.

Also,  The proposed system is heating the rooms by radiant floor heating.  I use baseboard heating in the model to simulate this, but do I also use baseboard in the baseline design or just hot water coils in the PTAC?  Thank you for any help.

John Grando

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