Mastering HVACR: Essential Concepts & System Operations
Refrigerant Definition
A refrigerant is a substance, usually a fluid, used in a refrigeration cycle. It absorbs heat from a low-temperature source (evaporator) and releases heat to a high-temperature sink (condenser) as it undergoes phase changes (evaporation and condensation).
Refrigerant Classification
Primary Refrigerants
These are the working fluids that directly participate in the refrigeration cycle by undergoing phase changes.
- Examples: Ammonia (NH3 - R717), R-12, R-134a, R-22
Secondary Refrigerants
These are fluids that are cooled by the primary refrigerant and then transport the cooling effect to the desired location. They do not undergo a phase change.
- Examples: Brine solutions (saltwater), glycol solutions, water
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