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The refrigeration cycle moves heat, not “cold.” The refrigerant absorbs heat in the EVAPORATOR (low pressure/low temp), is pressurized by the COMPRESSOR (raises pressure and temperature), rejects heat in the CONDENSER (high pressure/high temp), then is pressure-dropped by the METERING DEVICE (TXV/cap tube) to feed the evaporator again.
Key keywords to remember: • Evaporator = heat absorbed, refrigerant boils, low-side • Compressor = “pump,” raises pressure/temperature, creates pressure differential • Condenser = heat rejected, refrigerant condenses to liquid, high-side • Metering device = pressure drop + flow control, creates low-side Typical states (conceptual): • Leaving evaporator: low-pressure vapor (often slightly superheated) • Leaving compressor: high-pressure superheated vapor • Leaving condenser: high-pressure liquid (often subcooled) • Leaving metering device: low-pressure liquid/vapor mix (“flash gas”)
Worked example (concept): If the condenser is dirty, heat rejection falls → head pressure rises → compressor amps rise → capacity drops. (Common exam linkage: dirty condenser → high head pressure.)
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