The absorption of the amount of heat necessary for the change of state from a liquid to a vapor by evaporation, and the release of that amount of heat necessary for the change of state from a vapor back to the liquid by condensation are the main principles of the refrigeration process, or cycle.
What is the working principle of absorption refrigeration system?
The lithium bromide solution acts like a compressor in drawing off “refrigerant vapour”, in this case water, from the evaporator, causing the pressure and saturation temperature to reduce to the required cooling temperature . This process is the basic principle by which the absorption cycle operates.
What principle makes mechanical refrigeration possible?
Mechanical refrigeration systems are based on the principle that absorption of heat by a fluid (refrigerant) as it changes from a liquid to a gas lowers the temperature of the objects around it.
What are the 5 main components in mechanical refrigeration?
- Condenser. Condensation changes gas to a liquid form. ...
- Compressor. ...
- Evaporator. ...
- Expansion Valve.
What are the four major components of a mechanical refrigeration system?
- The compressor.
- The condenser.
- The expansion device.
- The evaporator.
What are types of refrigeration?
- Evaporative Cooling. Evaporative cooling units are also referred to as swamp coolers. ...
- Mechanical-Compression Refrigeration Systems. Mechanical compression is used in commercial and industrial refrigeration, as well as air conditioning. ...
- Absorption. ...
- Thermoelectric.
What is the unit of refrigeration?
The unit of refrigeration is expressed in terms of ton of refrigeration (TR) . One ton of refrigeration is defined as the amount of refrigeration effect (heat transfer rate) produced during uniform melting of one ton (1000kg) of ice at 0°C to the water at the 0°C in 24 hours.
Are refrigeration cycle is used in?
Explanation: Gas liquefaction is physical conversion of a gas into a liquid state (condensation). The liquefaction of gases is a complicated process that uses various compressions and expansions to achieve high pressures and very low temperatures. Air refrigeration cycle is used in gas liquefaction process .
What is COP in refrigeration?
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.
How much is a ton of refrigeration?
When referring to a system’s capacity, most technicians define a ton of refrigeration as 12,000 Btu per hour . It is the “per hour” that is important to remember when discussing a ton of refrigeration. A ton of refrigeration can also be stated as the heat transfer of 288,000 Btu per 24 hours, or 200 Btu per minute.
What are the four main parts of refrigeration?
Mechanical refrigerators have four basic elements: an evaporator, a compressor, a condenser, and a refrigerant flow control (expansion valve) . A refrigerant circulates among the four elements changing from liquid to gas and back to liquid.
What is the 4 component of refrigeration?
The refrigeration cycle contains four major components: the compressor, condenser, expansion device, and evaporator .
What are the basic units of mechanical refrigeration system?
The diagram below illustrates the four basic components of every refrigeration system. These include the Evaporator, the Compressor, the Condenser, and a Metering Device . A refrigerant is then circulated through each component for the sole purpose of removing heat.
Which cycle is used in refrigeration?
The vapor-compression refrigeration is the most widely used cycle for refrigerators, air- conditioners, and heat pumps.
What are the three major refrigerant lines?
These individual components are connected by refrigerant piping. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser , and the liquid line connects the condenser to the expansion device.
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.
