coefficient of performance: meaning, definition, pronunciation and examples
C2technical/scientific
Quick answer
What does “coefficient of performance” mean?
A dimensionless ratio used in thermodynamics to measure the efficiency of a heat pump, refrigerator, or air conditioning system.
Audio
Pronunciation
Definition
Meaning and Definition
A dimensionless ratio used in thermodynamics to measure the efficiency of a heat pump, refrigerator, or air conditioning system.
More broadly, a ratio of useful heating or cooling provided to the energy or work required to achieve it.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Both use the full term or the acronym COP.
Connotations
Pure technical term with no differing connotations.
Frequency
Used with equal frequency in UK and US engineering and physics contexts.
Grammar
How to Use “coefficient of performance” in a Sentence
The [device] has a coefficient of performance of [value].We need to calculate the coefficient of performance for [the system].Vocabulary
Collocations
Examples
Examples of “coefficient of performance” in a Sentence
verb
British English
- [N/A - noun phrase]
American English
- [N/A - noun phrase]
adverb
British English
- [N/A - noun phrase]
American English
- [N/A - noun phrase]
adjective
British English
- [N/A - noun phrase]
American English
- [N/A - noun phrase]
Usage
Meaning in Context
Business
Used in product specifications and marketing for HVAC systems and heat pumps.
Academic
Central concept in thermodynamics, mechanical engineering, and sustainable energy courses.
Everyday
Rarely used outside of discussions about home appliance efficiency or energy bills.
Technical
Primary term for quantifying the efficiency of refrigeration cycles and heat engines.
Vocabulary
Synonyms of “coefficient of performance”
Vocabulary
Antonyms of “coefficient of performance”
Watch out
Common Mistakes When Using “coefficient of performance”
- Confusing COP with 'Energy Efficiency Ratio' (EER) which uses different units.
- Saying 'coefficient for performance'. The preposition is 'of'.
FAQ
Frequently Asked Questions
For a heat pump, a COP above 3 is considered good under standard conditions. Modern systems can achieve COPs of 4 or higher.
Yes, a higher COP indicates greater efficiency, meaning more heating or cooling output for the same electrical energy input.
Efficiency is usually a percentage (0-100%). COP is a ratio that can exceed 1 (or 100%) because it measures energy moved, not created.
Yes, if a cooling system is very inefficient or malfunctioning, its COP can be less than 1, meaning it uses more energy than the cooling it provides.
A dimensionless ratio used in thermodynamics to measure the efficiency of a heat pump, refrigerator, or air conditioning system.
Coefficient of performance is usually technical/scientific in register.
Coefficient of performance: in British English it is pronounced /ˌkəʊɪˈfɪʃ(ə)nt əv pəˈfɔːməns/, and in American English it is pronounced /ˌkoʊəˈfɪʃənt əv pərˈfɔːrməns/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[not applicable for this technical term]”
Learning
Memory Aids
Mnemonic
Think COP: The 'Cooling Output vs. Power' ratio.
Conceptual Metaphor
EFFICIENCY IS A MULTIPLIER (a COP of 3 means you get 3 units of heat for 1 unit of electricity).
Practice
Quiz
What does a coefficient of performance (COP) measure?