Engineering English
Coefficient of Performance
Energy Engineering · Mechanical Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: The coefficient of performance is the ratio of useful heating or cooling output to the energy input for a heat pump or refrigeration system. It quantifies the efficiency of heat transfer devices under specific operating conditions.
Example in context
“The heat pump achieved a coefficient of performance of 3.8 under standard rating conditions, indicating efficient operation.”
“Isı pompası standart değerlendirme koşullarında 3.8 performans katsayısına ulaşarak verimli çalıştığını gösterdi.”
Where engineers use it
The coefficient of performance appears on heat pump datasheets, efficiency calculations, and HVAC system design tasks. Engineers use it to compare heat pump performance, size equipment, and evaluate seasonal energy costs.
Synonyms: COP
In Mechanical Engineering
The ratio of useful heating or cooling provided by a heat pump or refrigeration system to the work input required. A higher coefficient of performance indicates greater efficiency.
“The new heat pump achieves a coefficient of performance of 4.5, meaning it delivers 4.5 units of heat for every unit of electricity consumed.”
Practice: can you use “Coefficient of Performance” at work?
You are reviewing a contractor's proposal for a new heat pump. The specification lists a COP of 2.9, but you suspect a better unit exists. Explain how to use COP to evaluate the options.
Show a model answer
“The coefficient of performance indicates how efficiently your heat pump converts electricity into heating or cooling.”
“Coefficient of Performance” in 21 languages
| English | Coefficient of Performance |
|---|---|
| Turkish | performans katsayısı |
| French | coefficient de performance |
| German | Leistungszahl |
| Spanish | coeficiente de rendimiento |
| Chinese | 性能系数 |
| Arabic | معامل الأداء |
| Portuguese | coeficiente de desempenho |
| Russian | коэффициент производительности |
| Japanese | 成績係数 |
| Italian | coefficiente di prestazione |
| Vietnamese | hệ số hiệu suất |
| Hindi | प्रदर्शन गुणांक |
| Thai | ค่าสัมประสิทธิ์สมรรถนะ |
| Indonesian | koefisien kinerja |
| Korean | 성능 계수 |
| Bengali | কর্মক্ষমতা সহগ |
| Dutch | prestatiecoëfficiënt |
| Swedish | prestandakoefficient |
| Finnish | tehokerroin |
| Ukrainian | коефіцієнт продуктивності |
Frequently asked questions
What does Coefficient of Performance mean in engineering?
The coefficient of performance is the ratio of useful heating or cooling output to the energy input for a heat pump or refrigeration system. It quantifies the efficiency of heat transfer devices under specific operating conditions. In Energy Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce Coefficient of Performance?
Coefficient of Performance is pronounced /koʊɪˈfɪʃənt əv pərˈfɔːrməns/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is Coefficient of Performance used in a sentence?
Example from an engineering context: “The heat pump achieved a coefficient of performance of 3.8 under standard rating conditions, indicating efficient operation.”
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