Formula & example
COP=QL/W; COPCarnot=Tcold/(Thot−Tcold), temperatures in kelvin.
5 kW cooling from 1.5 kW input gives COP 3.33; the Carnot comparison shows the theoretical ceiling for entered temperatures.
HVAC engineering calculator · Updated Sep 17, 2026
Refrigeration COP Calculator — Cooling Capacity, Power & Carnot Limit
Calculate refrigeration COP from cooling capacity and input power, then compare with the Carnot COP from evaporating and condensing temperatures.
Inputs
Result
Actual COP 3.3333333
Carnot COP 6.95375
Fraction of Carnot 47.935766%
Equivalent EER 11.373807 BTU/Wh
Assumptions & limits
- Cooling capacity and input power use the same power basis.
- Carnot COP is an ideal reversible upper bound, not an equipment rating.
Frequently asked questions
What does this Refrigeration COP Calculator calculate?
Calculate refrigeration COP from cooling capacity and input power, then compare with the Carnot COP from evaporating and condensing temperatures.
Can I use SI and US customary units?
Yes. The calculator exposes the unit basis in the inputs and reports useful cross-unit outputs where the engineering workflow benefits from them.
Is this a replacement for HVAC design software?
No. It is a transparent deterministic engineering calculator for sizing, diagnostics and cross-checks. Final equipment, duct and refrigeration decisions should use measured conditions, manufacturer data and applicable codes or standards.