The document discusses the refrigeration cycle used in domestic refrigerators. It describes the key components of a refrigerator - compressor, condenser, capillary tube/throttling device, evaporator - and the changes in state that the refrigerant undergoes in each component. Specifically, it notes that in the evaporator the refrigerant absorbs heat from the refrigerator interior as it evaporates from liquid to vapor, providing the cooling effect. It also defines the refrigeration effect and coefficient of performance (COP) of the refrigeration cycle.

2. TEMPERATURE
ENTROPY
ISENTROPICCOMP.
ISENTROPICEXP.
ISOTHERMAL HEAT EXCHANGE
ISOTHERMAL HEAT EXCHANGE
NOT POSSIBLE CONDITIONS IN REVERSE CARNOT CYCLE
1. WHOLE COMPRESSION IN WET REGION
2. ISENTROPIC EXPANSION
3. ISOTHERMAL HEAT EXCHANGE
SO WE CAN SAY THAT , THIS CYCLE IS ALMOST IMPRACTICAL.
DOMESTIC REFRIGERATOR
1
23
4

3. COMPRESSOR
CONDENSER
CAPILLARY TUBE/
THROTTLING DEVICE
EVAPORATOR
BEFORE EVAPORATION
 LIQUID REFRIGERENT
 LOW PRESSURE
 LOW TEMPERATURE
AFTER EVAPORATION/BEFORE COMP.
 VAPOUR REFRIGERENT
 LOW PRESSURE
 LOW TEMPERATURE
AFTER COMPRESSION
 VAPOUR REFRIGERENT
 HIGH PRESSURE
 HIGH TEMPERATURE
AFTER CONDENSER
 LIQUID REFRIGERENT
 HIGH PRESSURE
 LOW TEMPERATURE
DESIRE EFFECT OR REFRIGERATION EFFECT
WORK INPUT(W)
Q1
W
Q
INPUTWORK
EFEECTDESIRE
COP 2
_
_


4. PRESSURE
ENTHELP
Y
P
H
4 1
23
EVAPORATION
CONDENSATION
EXPANSION
DESIRE EFFECT = EVAPORATION=Q2=( h1-h4)
WORK INPUT = COMPRESSION = WC = (h2-h1)
COP OF VCRS= DESIRE EFFECT / WORK INPUT
COP= (h1-h4)/(h2-h1)

5. Parameter
of Process
Refrigeration
Effect
Work input COP
evaporation
pressure
decrease
will decrease will increase Decrease
condenser
prassure
increase
will decrease will increase Decrease
Subcooling will Increase will decrease Increase
Super Heating will Increase
incearse or
decrease
not say
PRESSURE
ENTHELP
Y
P
H
4 1
23
EVAPORATION
CONDENSATION
EXPANSION