The refrigeration cycle starts and ends with the compressor The refrigerant flows into the Compressor where it is compressed and pressurised At this point, the refrigerant is a hot gas The refrigerant is then pushed to the Condenser which turns the vapour into liquid and absorbs some of the heat
What are the 4 cycles of refrigeration?
The refrigeration cycle contains four major components: the compressor, condenser, expansion device, and evaporator
How does the evaporator work?
The evaporator works the opposite of the condenser, here refrigerant liquid is converted to gas, absorbing heat from the air in the compartment This causes the refrigerant to absorb heat from the warm air and reach its low boiling point rapidly The refrigerant then vaporizes, absorbing the maximum amount of heat
Where is refrigeration cycle used?
The vapor-compression refrigeration is the most widely used cycle for refrigerators, air- conditioners, and heat pumps
How do you calculate refrigerant tons?
Some commercial and industrial refrigeration systems are rated in Tons of Refrigeration (TR, tons) A ton is the amount of heat removed by an air conditioning system that would melt 1 ton (2000 lbs)Converting between Btu/h and Tons of Refrigeration Btu/h Refrigeration Ton kW 48000 4 141 54000 4 1/2 158 60000 5 176
How is evaporator length calculated?
If the evaporator must move 400 gallons per minute: 14 x 400 = 5,600 Multiply the answer by 500: 5,600 x 500 = 2,800,000 This answer is the evaporator’s size, measured in BTUs per hour Divide the answer by 12,000: 2,800,000 / 12,000 = 23333
How does a refrigerator evaporator work?
An evaporator fan draws air from the refrigerator and blows it over the evaporator coils The liquid refrigerant absorbs heat from the air and the air blows back into the refrigerator at a lower temperature, cooling the refrigerator The liquid refrigerant starts to vaporize as it heats up and moves to the compressor
What is condenser in refrigeration?
3 Condenser The function of the condenser in a refrigeration system is to transfer heat from the refrigerant to another medium, such as air and/or water By rejecting heat, the gaseous refrigerant condenses to liquid inside the condenser
What is refrigeration system?
Refrigeration systems operate on a series of consecutive thermodynamic processes that form a cycle that returns the working substance to the same state A thermodynamic refrigeration cycle removes heat from a low-temperature object (refrigeration) and rejects it at a higher temperature
What is refrigeration principle?
The refrigeration cycle is based on the long known physical principle that a liquid expanding into a gas extracts heat from the surrounding substance or area Refrigerants evaporate or “boil” at much lower temperatures than water, which permits them to extract heat at a more rapid rate than the water on your finger
What are the 4 main components of a refrigeration system?
The 4 Main Refrigeration Cycle Components The compressor The condenser The expansion device The evaporator
What temperature is a refrigerator?
Keep the refrigerator temperature at or below 40° F (4° C) The freezer temperature should be 0° F (-18° C) Check temperatures periodically Appliance thermometers are the best way of knowing these temperatures and are generally inexpensive
What do you mean by 1 ton of refrigeration?
It is defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours
What is TR capacity?
Ton of Refrigeration (TR): Ton of Refrigeration (abbreviated as TR) is an important historical unit of refrigeration capacity American Society of Heating, Refrigerating and Airconditioning Engineers (ASHRAE) defines 1 TR as equivalent to a refrigeration capacity of 351685 W or 302395 kcal/h
What is RTh chilled water?
RTh stands for Refrigeration Ton-hour: it expresses a cooling energy One Refrigeration Ton is the rate of heat removal required to freeze a metric ton (1000 kg) of water at 0°C in 24 hours
What is TD temperature?
Dew point temperature is a measure of atmospheric moisture It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant)
What does TD mean in HVAC?
An evaporator’s temperature difference (TD) is the difference between the saturation temperature of the refrigerant inside the coil and its entering air temperature The greater the temperature difference, the more moisture will be removed from the air and the lower maintained rh in the case
How do refrigerator compressors work?
In the first stage of the refrigeration cycle, refrigerant enters a compressor as a low-pressure vapor The compressor compresses the refrigerant to a high-pressure vapor, causing it to become superheated Once the refrigerant is compressed and heated, it leaves the compressor and enters the next stage of the cycle
How does a condenser and evaporator work?
While the evaporator coil picks up heat from indoor air, the condenser coil releases heat into outdoor air An expansion valve before the evaporator restricts the flow of refrigerant, forcing it through a narrow orifice and converting it back to a vaporized state, ready to absorb more heat energy from your home
Where is the evaporator in a refrigerator?
The evaporator coils sit in the back of the freezer compartment of a refrigerator and look like a radiator The back wall of the freezer is actually the cover of the evaporator coil and can easily be opened with a screwdriver
How do condensers work?
Principle of operation A condenser is designed to transfer heat from a working fluid (eg water in a steam power plant) to a secondary fluid or the surrounding air As the vapor cools, it reaches the saturation temperature, condenses into liquid and releases large quantities of latent heat
Is refrigerant gas or liquid?
A refrigerant is a working fluid used in the refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated phase transition from a liquid to a gas and back again
How does an A C condenser work?
The compressor pressurizes the refrigerant gas and sends the refrigerant into the outdoor unit’s condenser coil A large fan pulls outdoor air through the condenser coil, allowing the air to absorb heating energy from the home and release it outside During this process, the refrigerant is converted back to a liquid