Question: cooling box


assume we have a cooling box that we open for a time period delta t. The box may be opened on top, so no cold air gets lost. What is the best way to model this in Maplesim ? So far, i have a heat capacity as box model for the cold air in it. I modeled a constant negative signal   during the time window delta t  and connected  a prescribed heat flow component to it.


Is this a reasonable model  in the easiest case ?



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