What does the compressor do in the vapor compression refrigeration system?
The compressor does the work to raise the pressure, and the expansion valve assures that adequate pressure is retained in the condenser for heat transfer. The vapor compression cycle can be used to cool air, liquid, or cold plates.
In what condition does the refrigerant leave the compressor?
As it leaves the compressor, the refrigerant is a hot vapor, roughly 120° to 140°F. It now flows into the outdoor coil, (known as the condenser). Again, as the name suggests, the refrigerant condenses here. As it condenses, it gives up heat to the outside air, which is blown across it by a fan.
What is effect of compression process on refrigerant Vapour?
Work is supplied to the compressor during the isentropic compression (1-2) of refrigerant vapour from evaporator pressure Pe to condenser pressure Pc, and work is produced by the system as refrigerant liquid expands isentropically in the turbine from condenser pressure Pc to evaporator pressure Pe.
What is the function of liquid line in simple Vapour compression?
Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere.
What is simple Vapour absorption system?
The simple vapour absorption system, as shown in fig. 2.1, consists of an absorber, a pump, a generator and a pressure reducing value to replace the compressor of vapour compression system. The other components of the system are condenser, receiver, expansion value and evaporator as in the vapour compression system.
What is the difference between vapor compression and absorption?
The major Difference between Vapor Compression and Absorption System is that Vapor Absorption System takes in low-grade energy as waste heat from the furnace, exhaust steam, or solar heat for its operations.
What is absorption chiller how it works?
There are many different types of Absorption chillers but they all work on a similar principle. In a low pressure system an absorption fluid is evaporated, removing heat from the chilled water. A heat source such as steam, exhaust gas or hot water is used to regenerate the Absorption solution.
What is simple Vapour absorption system how its performance can be improved?
The performance of an absorption refrigeration system is required to make it an efficient alternative of vapour compression refrigeration systems. This study suggests that the performance of absorption refrigeration is improved by using double-effect and semi-generator absorber solution heat exchanger arrangement.
What problems does lubricating oil cause in the evaporator?
Oil usually logs in the evaporator because it is the coldest component with the largest tubes, thus has the slowest refrigerant velocity. Oil logged in the evaporator will coat the inner wall of the coil and reduce the heat transfer through the walls. This will cause a loss of capacity and poor performance.
What is Vapour absorption cycle?
Simple Vapour Absorption Cycle: The most commonly used fluids in the absorption system are water as absorbent and ammonia as refrigerant. The vapour from the evaporator is allowed to be mixed and absorbed in the absorber.
How do you increase police of Vapour absorption refrigeration system?
The C.O.P. of Vapor Absorption system can be improved by using generator temperatures from 65 to 80 deg C, using Lithium Bromide as absorbent and Water as refrigerant, using higher evaporator and generator temperature, low condenser temperature., double liner heat exchanger, gravity heat pipe, using single effect …
Why ammonia is used in Vapour absorption refrigeration system?
As the ammonia from evaporator enters the absorber, it is readily absorbed by water and the strong solution of ammonia-water is formed. During the process of absorption heat is liberated which can reduce the ammonia absorption capacity of water; hence the absorber is cooled by the cooling water.
Why absorption refrigeration cycles are used instead of vapor compression cycles?
Thus in absorption refrigeration system no extra power in the pure electric form is required and the energy that would have otherwise gone wasted is utilized in the plant. Thus the running cost of the absorption refrigeration system is much lesser than the vapor compression system.
Where is Vapour absorption refrigeration system used?
Absorption refrigerators are commonly used in recreational vehicles (RVs), campers, and caravans because they can be powered with propane fuel, rather than electricity. Unlike more common vapor-compression refrigeration systems, an absorption refrigerator can be produced with no moving parts other than the coolants.
Which is usually the costliest item in a refrigeration system?
Condenser.
What is vapor absorption refrigeration?
Indian Institute of Technology Kanpur. Kanpur 208016 India. Vapor absorption refrigeration system. ◉ An absorption refrigerator is a refrigerator that uses a heat source (e.g., solar energy, a fossil-fuel flame, waste heat from factories, or district heating systems) to provide the energy needed for the cooling process …
Which is the secondary refrigerant in an ice plant?
The commonly used secondary refrigerants are the solutions of water and ethylene glycol, propylene glycol or calcium chloride. These solutions are known under the general name of brines. How secondary refrigerant used in ice plants: The usual brines used in freezing tanks are sodium chloride or calcium chloride.
Which of the following are used in an absorption refrigeration cycle?
In absorption refrigeration cycle, which of the following is used? Explanation: Both refrigerant and absorbent are used in absorption refrigeration cycle. 2. In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly.
Which of the following is NOT refrigerant?
Ethylene is widely used in chemical industry. Ethylene is also an important natural plant hormone, used in agriculture to force the ripening of fruits. it is a non refrigerant.
Which of the following is absorption unit?
Explanation: Cyclone collector, Gravitation settling chamber and Dynamic precipitator are used to remove particulate matter, whereas Plate tower is used to remove gaseous matter and is an absorption unit.
What type of compressor is most often used in large chillers?
Vapor compression chillers may use any of a number of different types of compressors. Most common today are the hermetic scroll, semi-hermetic screw, or centrifugal compressors. The condensing side of the chiller can be either air or water cooled.
Which type of compressor cooling is most common?
Reciprocating Air Conditioner Compressor The reciprocating compressor is the most popular type of AC compressor. A piston compresses the air by moving up and down inside of a cylinder.
What types of compressors are typically installed on water chillers?
What type of compressors are typically installed on water chillers? Water chillers use reciprocating, scroll, rotary helical (screw), or centrifugal compressors.