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

• I
In summary, the conversation discusses the efficiency and perfection of air conditioning systems. While the efficiency of a compressor is around 85%, the overall efficiency of the air conditioner is only about 70%. The perfection of a modern air conditioner, however, is only slightly over 10%, which is measured by the coefficient of performance.
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TL;DR Summary
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.

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

kuruman

## 1. What is the ratio of a real value to the max theoretical value?

The ratio of a real value to the max theoretical value is a comparison between the actual value and the highest possible value that can be achieved in a given situation. It is often used to evaluate the performance or efficiency of a system or process.

## 2. How is the ratio of a real value to the max theoretical value calculated?

The ratio is calculated by dividing the real value by the max theoretical value and multiplying by 100 to get a percentage. The formula is: (Real Value / Max Theoretical Value) x 100 = Ratio.

## 3. What is the significance of the ratio of a real value to the max theoretical value?

The ratio provides insight into how close the real value is to the maximum potential value. A high ratio indicates that the real value is close to the max theoretical value, while a low ratio suggests there is room for improvement.

## 4. Is there a specific term for the ratio of a real value to the max theoretical value?

Yes, the ratio is commonly referred to as the "efficiency ratio" or the "performance ratio." It can also be called the "actual-to-potential ratio" or the "achievement ratio."

## 5. How is the ratio of a real value to the max theoretical value used in scientific research?

The ratio is often used in scientific research to evaluate the effectiveness of a particular method or process. It allows researchers to compare the actual results to the maximum potential results and identify areas for improvement. It is also used to validate the accuracy and reliability of experimental data.

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