Which operational risk escalates when heat input surpasses design limits in vapour-compression refrigeration?

💡 Explanation

When excessive heat input occurs, the lubricant viscosity decreases due to thermal breakdown, because lubricant film strength falls until metal-to-metal contact in bearings of compressor rises, degrading the bearings far faster. Therefore accelerated bearing wear results, not complete blockage, fan failure, or sudden refrigerant loss, each resulting from independent thermal or mechanical strains.

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