Heat shield. Reflects the Electromagnetic Radiation from the engine. Preventing the A/C lines from absorbing the Electromagnetic Radiation and converting it into Thermal heat.
Any matter with Thermal heat produces Electromagnetic Radiation which can be absorbed and converted to Thermal heat. This is now the Sun transfers energy to the earth, Thermal heat cannot transverse a vacuum, which is what space is. This explains why the Sun and the earth retain their Thermal heat. It also explains why a White roof (80% reflective) is cooler then a dark roof.








