Thermodynamic Machines Flashcards
1
Q
Heat engine
A
It converts all heat energy into mechanical energy
2
Q
Mechanism of heat engine
A
|source| –> |working substance| –> |sink|
Temperature of source - T1
Temperature of sink - T2
T1>T2
3
Q
Efficiency of a heat engine
A
n = 1-Q2/Q1 = 1-T2/T1
Q2/Q1 = T2/T1
4
Q
In case of Refrigerator work is done
A
On it
5
Q
In case of refrigerator Work done together with the heat absorbed is
A
Rejected to the source
6
Q
Coefficient of performance of refrigerator
A
Beta= Q2/(Q1-Q2)
= T2/(T1-T2)
= (1-n)/n
7
Q
As the heat engine works, the Working substance undergoes
A
Carnot cycle
8
Q
Wnet for Carnot cycle
A
Area of the cycle
9
Q
An ideal reversible heat engine
A
Carnot engine
