I 'am using a HVAC air loop with a Coil:Cooling:Water obejct, an OutdoorAir:Mixer object and an a Controller:OutdoorAir object. I tried to use a outdoor air flow rate of 0,026 m3/s (=max. and min outdoorair flow rate of Controller:OutdoorAir). I also tried a second approach using the Design:Specification:OutdoorAir object. For both situations I got some temperature peaks on the supply outlet only when the outdoor air flow rate value is used. Looking through the results I could find out that on the mixed air outlet I got a temperature rise of about 5 C with 27,7 C (drybulb) and 0,0096 kg/kg moisture for the outdoor air. The return air without temperature peaks is 28 C and 0,0066 kg/ kg moisture. The mixed air mass flow rate has a value of 8,67 kg/s (7,2 m3/s) and the outdoor air flow rate has a value of 0,0308 kg/s (0,026 m3/s). Consider the facts the temperature rise for the concrete point of time seems to be something strange for me.
There are some experiences using an outdoor air flow rate?
