Stable heat transfer is the simplest and most basic heat transfer process. Or when an object is subjected to constant heat under a certain environment, the temperature distribution inside the object and the heat transfer through the object do not change with time.
Generally, it means that when the building envelope is subjected to constant heat under a certain environment, the temperature distribution inside the envelope and the heat transfer through the envelope are in a stable heat transfer state that does not change with time.
The main features are:
(1) The heat flow intensity q through the flat wall is equal everywhere;
(2) The temperature distribution of each interface in the flat wall with the same material is linear;
