23-06-2012, 04:06 PM
Development of Rapid Cooling Refrigerating Unit
[attachment=25298]
INTRODUCTION
1.1 VAPOUR COMPRESSION REFRIGERATION SYSTEM( VCRS)
The vapor compression refrigeration system 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. All such system have four components a compressor, a condenser, an expansion valve (also called a throttle valve), and an evaporator.
Circulating refrigerant enters the compressor in the thermodynamic state known as a saturated vapor and is compressed to a higher pressure, resulting in a higher temperature as well. The hot, compressed vapour is then in the thermodynamic state is known as superheated vapour and it is at temperature and pressure at which it can be condensed with typically available cooling water or cooling air. That hot vapour is routed through a condenser where it is cooled and condensed into liquid by flowing through a coil and tubes with cool water or cool air flowing across the coil or tubes. This is where the circulating refrigerant rejects heat from the system and rejected heat is carried away by the either water or the air (whichever may be the case).
The condensed liquid refrigerant, in the thermodynami9c state is known as saturated liquid, is next routed through an expansion valve where it undergoes an abrupt reduction in pressure. That pressure reduction results in the adiabatic flash evaporation of a part of liquid refrigerant. The auto- refrigeration effect of the adiabatic evaporation lowers the temperature of liquid and vapour refrigerant mixture to where it is colder than the temperature of the enclosed space to be refrigerated.
2 )A Study on Analysis and Fabrication of an Ice Plant Model
Refrigeration may be defined as the process of achieving and maintaining a temperature below that of the surroundings, the aim being to freeze ice, cool some product, or space to the required temperature. The basis of modern refrigeration is the ability of liquids to absorb enormous quantities of heat as they boil and evaporate. One of the important applications of refrigeration is in ice plant. Ice plant is used for producing refrigeration effect to freeze potable water in standard cans placed in rectangular tank which is filled by brine. Our project based on simple refrigeration system which uses the vapour compression cycle. The vapour compression cycle comprises four process compression, condensing, and expansion and evaporation process. Our ice plant model contains various parts such as- Compressor, condenser, filter drier, Expansion valve, Evaporator coil, chilling tank and various measuring equipments like digital temperature indicator, pressure gauges, energy meter etc.
Use as a coolant
The major use of ethylene glycol is as antifreeze in, for example, automobile and personal computers. Due to its low freezing point, it is also used as a deicing fluid for windshields and aircrafts. Ethylene glycol is also commonly used in chiller water air conditioning system that places either the chiller or air handlers outside or systems that must cool below the freezing temperature of water.
THEORETICAL ASPECT
A vapour compression refrigeration system since low pressure vapour refrigerant from the evaporator is changed into high pressure vapour refrigerant in the compressor; therefore it is named as vapour compression system. It is an improved type of refrigeration system in which a suitable working substances, termed as refrigerant, is used. It condenses and evaporates at temperature and pressure close to the atmospheric conditions. The vapour compression refrigeration system is now-a-days used for all refrigeration purposes. It is generally used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant.
[attachment=25298]
INTRODUCTION
1.1 VAPOUR COMPRESSION REFRIGERATION SYSTEM( VCRS)
The vapor compression refrigeration system 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. All such system have four components a compressor, a condenser, an expansion valve (also called a throttle valve), and an evaporator.
Circulating refrigerant enters the compressor in the thermodynamic state known as a saturated vapor and is compressed to a higher pressure, resulting in a higher temperature as well. The hot, compressed vapour is then in the thermodynamic state is known as superheated vapour and it is at temperature and pressure at which it can be condensed with typically available cooling water or cooling air. That hot vapour is routed through a condenser where it is cooled and condensed into liquid by flowing through a coil and tubes with cool water or cool air flowing across the coil or tubes. This is where the circulating refrigerant rejects heat from the system and rejected heat is carried away by the either water or the air (whichever may be the case).
The condensed liquid refrigerant, in the thermodynami9c state is known as saturated liquid, is next routed through an expansion valve where it undergoes an abrupt reduction in pressure. That pressure reduction results in the adiabatic flash evaporation of a part of liquid refrigerant. The auto- refrigeration effect of the adiabatic evaporation lowers the temperature of liquid and vapour refrigerant mixture to where it is colder than the temperature of the enclosed space to be refrigerated.
2 )A Study on Analysis and Fabrication of an Ice Plant Model
Refrigeration may be defined as the process of achieving and maintaining a temperature below that of the surroundings, the aim being to freeze ice, cool some product, or space to the required temperature. The basis of modern refrigeration is the ability of liquids to absorb enormous quantities of heat as they boil and evaporate. One of the important applications of refrigeration is in ice plant. Ice plant is used for producing refrigeration effect to freeze potable water in standard cans placed in rectangular tank which is filled by brine. Our project based on simple refrigeration system which uses the vapour compression cycle. The vapour compression cycle comprises four process compression, condensing, and expansion and evaporation process. Our ice plant model contains various parts such as- Compressor, condenser, filter drier, Expansion valve, Evaporator coil, chilling tank and various measuring equipments like digital temperature indicator, pressure gauges, energy meter etc.
Use as a coolant
The major use of ethylene glycol is as antifreeze in, for example, automobile and personal computers. Due to its low freezing point, it is also used as a deicing fluid for windshields and aircrafts. Ethylene glycol is also commonly used in chiller water air conditioning system that places either the chiller or air handlers outside or systems that must cool below the freezing temperature of water.
THEORETICAL ASPECT
A vapour compression refrigeration system since low pressure vapour refrigerant from the evaporator is changed into high pressure vapour refrigerant in the compressor; therefore it is named as vapour compression system. It is an improved type of refrigeration system in which a suitable working substances, termed as refrigerant, is used. It condenses and evaporates at temperature and pressure close to the atmospheric conditions. The vapour compression refrigeration system is now-a-days used for all refrigeration purposes. It is generally used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant.