- System Details:
- Type: Low efficiency, minimum efficiency of 13 SEER
- Components: Tubing representing condensing and evaporator coils, fixed orifice metering device
- Refrigerant: R22
- Conditions: Outdoor 95°F, Indoor 75°F
- Superheat and Subcooling: 10°F each (example-specific)
Evaporator Side:
- Metering Device Output: 69 PSIG, 40°F refrigerant
- Evaporation Process:
- Begins immediately after the metering device in the evaporator coil
- Warm air (75°F) blows across the coil
- Refrigerant changes from liquid to vapor as it travels down the coil
- Fully evaporated at the bottom of the evaporator
- Superheat: Additional 10°F in the last pass of the evaporator (evaporator superheat)
Compressor Superheat:
- Total Superheat: Includes any superheat added through the suction line
- Traveling Conditions:
- Refrigerant may travel through warmer environments
- Total superheat can reach 20°F before entering the compressor
- Compressor Entry:
- 69 PSIG, 40°F saturation temperature
- 60°F actual temperature (20°F of total superheat)
- Refrigerant must be in vapor state to avoid compressor damage
Condenser Side:
- Condensing Process:
- Refrigerant leaves the compressor as a superheated vapor (175°F)
- Desuperheating: Cooled down to 125°F before condensing begins
- Condensation starts at the top of the coil and completes just before the last pass
- Subcooling: 125°F liquid refrigerant further cooled to 115°F by 95°F air (10°F subcooling)
- Cycle Restart: Subcooled refrigerant moves to the metering device
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