Evaporative direct research

Hi,

The airloop

For an evaporative cooling air-loop (showed above) operating 24 hours at he day, using a direct evaporative cooling with 0.88 cooler effectiveness and economizer always opened, there is a problem with indoors temperatures, see the picture attached.

C:\fakepath\ZONE TEMPERATURE CURVE.jpg

Checking the nodes temperatures, i can see something strange with leaving temperatures from the air loop, see the picture below.

C:\fakepath\NODE TEMPERATURES.jpg

You can see that leaving temperatures from the cooler (node 7) dry bulb temperature is according a cooler of 0.88 effectiveness, but near to 13:00 hour, temperatures leaving the cooler are higher than outdoor wetbulb (more than 3°C) and increase over time more and more. I would expect leaving drybulb temperature from the cooler 3°C more than outdoor wet bulb, but the temperature leaving the cooler increases more and more, this situation cause the strange indoor temperatures.

I think the economizer is not working at this range of time, can someone help me to solve this situation? there is another evaporative equipment i could use in openstudio?

Tank you