I want to use this example model
In this example,
'heat exchange data' parameter is set like this image
But I want to do a test using 'heat flow rate' parameter
so I changed the parameter like this,
1000w is default setting.
But, When I simulate this simulation
'impoesed heat flux has been reset ~ ' warning is occuring
what is the meaning of reset heat flux??
Is this meant to change the 'heat flow rate' parameter to zero?
I always thank you for your help
Solved! Go to Solution.
the warning mentions that the "heat flux value has been reset to be coherent with inlet temperatures or with heat exchange effectiveness of 1". This means that the "global heat flow rate (to external flow)" variable won't be equal to the "heat flow rate (to external flow)" parameter:
In your case this is due to the fact that from 0s to 50s both the "internal flow: volume temperature" and the "external flow: outlet mean temperature" are equal to 20°C:
consequently no heat can be exchanged (=> the charge air cooler cannot give 1000W to the air).
as the above pictures illustrate, the "reset" is only done when this is necessary. In fact this is more a limitation of the "global heat flow rate (to external flow)" than a reset of the "heat flow rate (to external flow)" parameter value.
I hope this answer will help you