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← TechnologyWhich outcome occurs when ethylene glycol overheats within a solar thermal collector panel?
A)Fluid darkening increases panel absorbance
B)Gas bubbles form, decreasing heat transfer✓
C)Panel expansion improves thermal contact
D)Metal fatigue reduces structural integrity
💡 Explanation
When ethylene glycol overheat within a solar panel, the increased temperature causes the fluid to vaporize (phase transition), forming gas bubbles which introduce thermal resistance that impede conductive/convective heat transfer. Therefore bubbling decreases effectivity, rather than darkening, expanding, or metal fatigue, which involve slower degradation mechanisms.
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