Temperature problems using an outdoor air flow rate
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?
What's the question here? Are you trying to fix the outdoor air flow rate?
What do you mean with "Are you trying to fix the outddor air flow rate"? I have set the value of 0,026 m3/s for the min outdoorair flow rate (Controller:OutdoorAir) and for the max outdoorair flow rate (Controller:OutdoorAir). Using a value of 0 I did'nt get any temperature rises. Also using a DX system with the same conditions I didn't get any temperature rises. I have also notice that a small infiltration rate also leads to some temperature rises. So the question is, if anyone knows, what could be wrong.