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sci.vapor-compression-COP Calculator
Calculates vapour compression refrigeration COP = Q_L/W_comp from cycle state points or temperatures: ideal COP_R = T_L/(T_H−T_L). Ideal Carnot COP between −10 °C and 40 °C: COP = 5.26 — real R134a cycle at same temperatures: COP ≈ 2.8–3.5 due to compressor irreversibility, pressure drops, and superheat.
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).
Q Load Kw
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Eta Comp
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
Carnot COP (ideal)
Sample size or count used in the calculation.
actual COP (with compressor efficiency)
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%.
compressor power W (kW)
Reference formula or conversion factor shown for context.
condenser heat rejection Q_cond (kW)
The value at the specified point or condition.
COP_carnot = T_evap/(T_cond-T_evap)
Sample size or count used in the calculation.
EER (BTU/W)
Reference formula or conversion factor shown for context.