2. Refrigeration cycle
Reducing of the temperature of an object below
the surrounding temperature is called as
Refrigeration
Refrigerant
In this refrigeration working fluid known as refrigerant.
Ex- NH3
3. Refrigerating effect
In the refrigerator the important quantity is the
energy remove from the cold chamber which is
known as refrigerating effect.
CO-efficient of Performance
• Co-efficient of performance is defined as the ratio
between the heat remove from the cold chamber and
the work Input in the system.
• COP=
𝑅𝐸 𝑒𝑓𝑓𝑒𝐶𝑡
𝑤 𝑖 𝑛
4. Refrigerator Capacity
The most important quantity in application of a
refrigerator is the amount of heat which must be
transferred per unit time from the cold chamber
and is known as refrigerator capacity.
Mass flow rate of Refrigeration
Refrigeration capacity divide by Refrigeration
effect per unit mass
6. 1-2 isentropic Compression of wet vapor
2-3 Heat rejection at constant Temperature
3-4 isentropic expansion of saturated liquid
4-1 Heat absorb at constant temperature
8. Modification of the Carnot cycle of
vapor compression refrigeration cycle
Replacement of
expansion
engine with
throttling value
Improving
the
condition of
compressor
inlet
Under cooling
of condenser
outlet
9. Replacement of expansion engine with
throttling value
Throttling process is constant enthalpy process. But highly irreversible.