The reversed Carnot cycle is used in refrigerators and heat pumps. It operates between two specified temperatures and achieves the highest theoretical coefficient of performance. The cycle involves four processes: 1) isentropic compression of the refrigerant using a compressor to the maximum temperature T2. 2) Isothermal condensation of the refrigerant using a condenser at T2. 3) Isentropic expansion of the refrigerant using an expansion device to the minimum temperature T1. 4) Isothermal absorption of heat from the substance using an evaporator at T1, providing the refrigeration effect.

1. REVERSED CARNOT
CYCLE

2. P
R
E
S
S
U
R
E
VOLUME
Pv γ
=C
PV=C
A refrigerator of heat pump that operates on the
reversed carnot cycle is called a Reversed Carnot
Refrigerator and Reversed heat Pump.
The reversed carnot cycle is most efficient Ref-
geartion cycle operating b/w two specified temp.
It sets the highest Theoretical C.O.P.
Process 1-2:- Refrigerant compressed to state 2
(reach at max. temperature T2 ) by using
compressor. isentropic compression.
Process 2-3:- refrigerent change from saturated
vapour state to saturated liquid state
isothermally( at max. temperature T2 )by using
condenser
Process 3-4:- refrigerent expand isentropically (
at min. temperature T1 )by using expanding
device. or expansion coil.
Process 4-1:- refrigerent absorbs heat from
substance isothermally( at min. temperature T2
)by using evaporator.(refrigeration effect will
done).

3. 2
1
3
4
T1= Min. Temperature
T2= Max. temperature
cooling Effect= QL =Q2
cooling effect (Q2 )= T2 ds