[EnergyPlus_Support] set point problem

[Sebastian Dietz <sebastian.dietz@xxxxxxxxxxxxxxxxx>]

Hello all,

I'm simulating a one zone model. The model includes a plant loop 
consisting of boiler:simple, baseboard:convective, heating coil and a 
air loop consisting of outside air mixer with heatrecovery, fan, heating 
coil and single duct:vav no reheat. I have two questions about the output.

1. I'm wondering that the output "heat exchanger total heating energy" 
has only positive values. Even in summer, when the heat exchanger has a 
cooling function for supply air. ( It should be negative because of the 
equation for air to air heatexchanger in the engineering reference 
Q_total = m * ( h_sup_in - h_sup_out))
2. The zone mean air temperature fluctuates about 0.8 degree centigrade 
around the setpoint of 22 degree centigrade (Baseboard priority 1, 
single duct priority 2). When I flip the priorities this effect   
disappears. Does anybody know where this effect comes from?

for more details I uploaded my testobj1.idf.

thanks in advance
Sebastian

-- 
Sebastian Dietz
Fraunhofer-Institut for Solare Energiesysteme ISE
Heidenhofstrasse 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 45 88-51 36
Sebastian.Dietz@xxxxxxxxxxxxxxxxx
http://www.ise.fraunhofer.de
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