In an ideal vapor-compression refrigeration cycle, the
refrigerant enters the compressor as a saturated vapor
and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space.
What is different between ideal and actual vapor compression cycle?
Most of the differences between the ideal and the actual cycles are because of the irreversibilities in various components which are: 1-In practice, the refrigerant enters the compressor at state 1, slightly superheated vapor, instead of saturated vapor in the ideal cycle.
Does ideal vapor compression refrigeration cycle involve any internal irreversibility?
The ideal compression refrigeration cycle is not an internally reversible cycle, since it involves
throttling
which is an irreversible process
What is ideal refrigeration cycle?
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space.
What happens in actual Vapour compression cycle?
The vapor usually leaves the evaporator is superheated to prevent droplet of liquid within the compressor
. Isentropic expansion does not occur due to friction and other losses. Pressure drop takes place in the evaporator and condenser due to. friction.
What are the four stages of refrigeration?
The refrigeration cycle
What is relative coefficient of performance?
Relative coefficient of performance defined as
the ratio of actual C.O.P. to the theoretical C.O.P. Relative C.O.P. = Actual C.O.P./Theoretical C.O.P.
– Comparison between COP of Heat Engine, Refrigerator, and Heat Pump.
What is COP formula?
COP =
|Q| W
. COP is defined as the relationship between the power (kW) that is drawn out of the heat pump as cooling or heat, and the power (kW) that is supplied to the compressor.
How can you increase the efficiency of a refrigeration cycle?
- 6 Ways to Optimize Your Refrigeration Efficiency and Lower Energy Costs. …
- Optimize settings. …
- Size compressors to match loads as closely as possible. …
- Install VFDs on screw compressors. …
- Install VFDs on condenser motors. …
- Use floating head pressure to maintain ideal temperatures. …
- Use a completely integrated automation system.
Why is the refrigeration cycle called a cycle?
It
has the maximum efficiency for a given temperature limit
. Since it is a reversible cycle, all four processes can be reversed. This will reverse the direction of heat and work interactions, therefore producing a refrigeration cycle.
What is the difference between vapor compression and absorption?
The major Difference between Vapor Compression and Absorption System is that
Vapor Absorption
What are the types of Vapour compression cycle?
There are basically two types of vapor compression (VC) systems:
mechanical vapor compression (MVC) and thermal vapor compression (TVC)
.
Why is wet compression not preferred?
Wet compression is
undesirable as there may be accumulation of liquid inside the cylinder
, which in turn will wash away the lubricant resulting in severe mechanical difficulties. Thus, to avoid this, a 5 to 20 K superheat of the refrigerant is always desirable.
What is COP in refrigeration?
The COP is determined by the ratio between energy usage of the compressor and the amount of useful cooling at the evaporator (for a refrigeration instalation) or useful heat extracted from the condensor (for a heat pump). A high COP value represents a high efficiency.
Why does the compression refrigeration cycle have a high pressure side?
“high side”
removes the oil entrained in the discharge gas and returns it to the compressor crankcase
. “high side” allows the technician to visually see the dcondition of the refrigerant in the line.
