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[EnergyPlus_Support] entering residential thermal distribution efficiency

I am trying to figure out how to best incorporate duct losses using energy plus in my model of a typical residential home with all the ducts located within an unconditioned basement.  For starters, I am going to use a Delivery Effectiveness of 0.80 for both the heating and cooling.  Currently, I am using the "direct air" air distribution option to connect my systems to my zones.  Can I include the duct leakage by specifying a small fraction of my supply air to the basement zone and then include the conduction losses by using a simple energy balance to specify the air temperature leaving the registers as slightly reduced from the air temperature leaving the system coils.  

It seems that a duct heat transfer model was implemented as a function within the systems simulation module in DOE-2.1E for RESYS and I am wondering whether something similar was done for EnergyPlus.  Overall, my question is whether I can use "direct air" or some other air distribution system to include duct losses and if so, how can I go about doing this.

Ian Doebber

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