Compressors, condensers, evaporators, metering devices, superheat and subcooling.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the primary function of a compressor in a refrigeration cycle?
Show answer
To increase the pressure and temperature of the refrigerant vapor- Name the four main types of compressors used in HVAC systems.
Show answer
Reciprocating, rotary, scroll, and centrifugal- How does a reciprocating compressor compress refrigerant?
Show answer
Pistons move up and down in cylinders to compress the vapor- Why is oil circulation critical in a compressor?
Show answer
To lubricate moving parts and remove heat from the compressor- Define discharge temperature in a compressor.
Show answer
The temperature of refrigerant vapor leaving the compressor discharge port- What does COP stand for in compressor efficiency?
Show answer
Coefficient of Performance- What is the primary function of a condenser?
Show answer
To reject heat and convert refrigerant from vapor to liquid state- List three common types of condensers in HVAC systems.
Show answer
Air-cooled, water-cooled, and evaporative- How does an air-cooled condenser reject heat?
Show answer
Outdoor air passes over the condenser coil to remove heat from the refrigerant- Define subcooling.
Show answer
The temperature difference between the refrigerant leaving the condenser and its saturation temperature at that pressure- Why is subcooling important in a refrigeration system?
Show answer
To ensure the refrigerant is completely liquid before reaching the metering device and prevent vapor from entering it- What is the typical ideal subcooling range for a properly operating system?
Show answer
10 to 20 degrees Fahrenheit- What typically controls the condenser fan motor?
Show answer
A high-side pressure switch or a thermostat- What advantage does a water-cooled condenser provide?
Show answer
It uses water circulation to reject heat instead of requiring large outdoor airflow- What happens if condenser airflow becomes restricted?
Show answer
Head pressure increases and subcooling decreases
FlashKeepers