Thermal requirements for high temperature vs. extreme summer.
In the automotive industry, the design validation tests and product validation tests are performed in thermal chamber conditions. During these tests, only the ECU is tested, without considering surrounding parts, solar radiation, and real-life convection conditions. The thermal chamber conditions are different than extreme real-life conditions. In extreme real car environment conditions, there are surrounding parts, like brackets and protection covers, which reduce the forced convection conditions significantly.
This presentation analyzes the difference between these conditions and explains why these conditions do not substitute each other. It is essential to analyze both situations and to take the right conclusions for both cases, being aware of the limitations.