I have problem in Airpak
 

Hi all I am student using airpak for analysis of flow of contaminated air in the room. my problem are as follows:

1.By running steady state flow : I find out the mass flow in and out the room does not balance ..what can be a problem here..

2. I specified a certain flow and I need them to remain constant all the time but the result shows the specified flows have other values some less and other great than specified ones; what is going wrong here

3.when checking the flow through walls ; I discovered that some cells on the wall there is flow through them, although the total mass flow throw the wall is remain zero as required, can this cause an problem in my analysis??

4. When checking the flow vectors I see that some opening allow flow-in at the bottom of the opening and allow flow-out at the top. but in reporting I get only one value which showing that the flow out or in; is this value a net value of the flow to that particular opening or and average one..?? so how can I balance the each component of the system..???

please I need your help on these problems so I can go forward with my work

Rajabu