1. The problem statement, all variables and given/known data The COP for heat pumps and refrigerators achieved in the industry is almost 50% of the Carnot limit. Make estimates for the following case: For refrigerator to achieve -10°C in the freezer area with an external temperature of 25°C 2. Relevant equations COP for refrigerator = T(low) / [T(high)-T(low)] 3. The attempt at a solution Using this equation, I find that the COP is 7.5, but this seems high. Where have I made a mistake?