how to set this inlet oundary
 

in one case, there is a hot air inflow hole,temperature is fixed at 626K, i specify it with vilocity inlet then specify it's temperature. specify it with unsteady solver. after the solution is converged, the temperature of this hole is 530K, why? it doesn't fix with actual condition. how can i let it's temperature fixed in solution. what shall i do with this case.

also there are some fixed vilocity outflow, how to do it? thanks