Ratio of a real value to the max theoretical value: what term to use?

[nomadreid]

TL;DR

Thermodynamics: there is supposedly a term in thermodynamics which means the ratio of a real value to its maximum theoretical value under the same conditions. (This is not the "Energy conversion efficiency (available output energy/ total input energy.) In Russian the term would be translated as "perfection", but I doubt if that is the term in thermodynamics. (Spoiler: I am not a physicist.) What is that term (in English)?

If the Summary is not clear, the following is an example translated from: https://telecombloger.ru/7335

'... air conditioning systems. For example, the efficiency of a compressor is about 85%. The remaining 15% is spent on friction, oil movement, overflows, heating, etc. The efficiency of the air conditioner as a whole can be estimated at about 70% - this takes into account the pressure drop in the pipelines, the efficiency of the throttle, the hydraulic resistance of the heat exchangers, etc.
However, the perfection of a modern air conditioner is only slightly over 10%. The fact is that for 1 kW of consumed electricity, the air conditioner must generate almost 30 kW of cold (27.5 kW for standard conditions), and the real cooling capacity is only 3-4 kW. The ratio of these numbers in refrigeration technology is called the "degree of thermodynamic cycle perfection" or, more simply, "perfection".
So, efficiency and perfection are completely different concepts and with a unit efficiency of 70%, its perfection can be only 10%.'

So, what should be in place of "perfection" in the above text? Or is it also "perfection" in English?
Thanks.

 

[kuruman]

I think you are referring to the coefficient of performance.

 

[nomadreid]

Thank you kuruman. That seems to fit. (And thanks to berkeman for editing a bit to clean my post up.)