PHYSICAL QUANTITY
Efficiency: formulas and units of measurement
Efficiency: symbol η, unit %. Formulas and explanations for Mechanics, MCT and thermodynamics.
\etaη\%percentage
KEY CONNECTIONS
Formulas
\eta=\frac{A_{\text{пол}}}{A_{\text{затр}}}η = Aпол / Aзатр
\eta=\frac{Q_{\text{пол}}}{Q_{\text{затр}}}η = Qпол / Qзатр
\eta=\frac{Q_1-Q_2}{Q_1}η = (Q₁ − Q₂) / Q₁
\eta=\frac{T_1-T_2}{T_1}η = (T₁ − T₂) / T₁
NOTATION
Quantities in formulas
- \eta
- Efficiency is the proportion of useful energy used.
- A_{\text{пол}}
- Useful work is the part of the work expended that is used for its intended purpose.
- A_{\text{затр}}
- Work expended is all the work done by a system or mechanism.
- Q_{\text{пол}}
- Useful heat is the part of the received heat used for its intended purpose.
- Q_{\text{затр}}
- Wasted heat is the entire amount of heat transferred to the system.
- Q_1
- Heater heat is the energy received by the working fluid from the heater.
- Q_2
- The heat of the refrigerator is the energy given by the working fluid to the refrigerator.
- T_1
- Heater temperature is the temperature of the hotter heat source.
- T_2
- Refrigerator temperature is the temperature of a cooler heat source.
THEORY
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