// multi-utility computation suite · offline · instant · precise
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eng.vapour-compression-COP Calculator
Calculates the Coefficient of Performance (COP) for a vapour-compression refrigeration cycle from saturation pressures and isentropic efficiency. Ideal COP = Tc / (Th − Tc) — a refrigerator maintaining −18°C (255K) with ambient of 30°C (303K) has theoretical COP of 5.3.
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
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
ideal (Carnot) COP
Sample size or count used in the calculation.
actual COP (with compressor η)
Reference formula or conversion factor shown for context.
EER (BTU/W·hr)
Reference formula or conversion factor shown for context.
COP_Carnot = Te / (Tc − Te)
Sample size or count used in the calculation.
temperature lift (Tc − Te)
Aerodynamic force perpendicular to the direction of motion. Lift = 0.5 × rho × v^2 × Cl × A. Enables flight when it exceeds weight.
energy star benchmark
Reference value for comparison — the industry standard, historical average, or target that this result is measured against.