Calculates vapour compression refrigeration system COP from compressor work and evaporator heat duty using refrigerant cycle enthalpies from state point data. COP_refrigeration = Q_evap/W_comp; COP_heat_pump = Q_condenser/W_comp = COP_R + 1 — higher COP is achieved with larger evaporator-condenser area (smaller ΔT).
Inputs
T Evap C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
T Cond C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Eta Comp Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
COP (refrigeration)
The proportional relationship between two quantities.
COP Carnot (ideal)
Sample size or count used in the calculation.
COP (heat pump)
The value at the specified point or condition.
EER (BTU/Wh)
Reference formula or conversion factor shown for context.
COP = TL/(TH−TL) × η_isentropic
Sample size or count used in the calculation.
efficiency class
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.