ECET 2026 MECH ECET 2026 MECH LearnNewThings September 16, 2025 0 Comments Day 2 Refrigerants & Properties – ECET 2026 Mechanical RAC Concept Notes Refrigerant is a working fluid used in Refrigeration & Air Conditioning (RAC) systems. It undergoes phase changes (liquid ↔ vapor) to absorb heat at a low temperature...