What is the purpose of the heat shield above the exhaust pipe?

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The exhaust pipe remains in a high-temperature state. Without a heat shield, the heat can raise the temperature of the car floor, affecting the interior temperature and posing a risk of melting the felt layer covering the car floor. Below is some information about the exhaust pipe: 1. During vehicle idling and low-speed driving: It reduces radiant heat flow and also serves to block hot air from directly conducting convective heat exchange with the car body. Therefore, during this time, it is preferable for the heat shield to dissipate heat as quickly as possible. 2. During high-speed driving: Its role is primarily limited to reducing the transfer of radiant heat flow, as the airflow beneath the car body is faster at this time, providing a cooling effect on the heated components. In other words, convective heat exchange at this stage will help dissipate heat from the car's underbody parts.