Gabe - sounds like one strange "view factor" to me. Sorry, I don't have a clue - but maybe if you tried turning off radiation temporarily and re-running the model to see if you still get the same effect from a change in orientation?
After doing some more troubleshooting, I found that even if I don't change the view orientation, Solidworks gives me a range of solutions for the average temperature of the exchanger from 30.0-31.4. It seems like Solidworks is performing itterations and locking onto different solutions each time.
Is this a possible culprit? Is there any way to change the itteration definitions in Solidworks?
Not to get sidetracked from the original issue, but I have an additional queurery about heat flux in SW. It appears as though Solidworks dissobeyes Kirchoff's laws! If I probe the average heat flux in the Y-direction over a heat collecting surface (constant temp boundary) and multiply by that area to get a total heat flux value, and then if I look at the total heat flux through the peice in the middle (refer to picture) they are different! Additionally, if I look at the total heat flux through the top plate and compare it to the flux through the bottom plate, they are also different!
If others run into this problem, I found that making the mesh significantly smaller helped resolve the issues.