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Freezers Fridges General Interest Industry Refrigerators

Saturation Temperature For Cooling Solutions

The Saturation Temperature of a substance refers – in essence – to its boiling point.
A more precise definition is that at its saturation temperature, a saturated vapor contains the least amount of thermal energy (i.e. heat) as is possible without condensing into a liquid form. Likewise, a saturated liquid contains as much thermal energy (again – heat) as is possible without the liquid boiling into gaseous state.
With regards to refrigerators, freezers and air conditioners; saturation temperature is a very critical concept. Most refrigeration cycles are based on the repeated transition of a refrigerant gas from liquid to gaseous phase (evaporation) and back from a gas to a liquid again (condensation).
R-22 Versus R-410a Saturation Temperature Chart
One point of interest about saturation temperatures is that it will vary depending on the pressure under which the chemical is stored. Normal boiling point is usually measured in terms of the liquid in question being kept at normal atmospheric pressure; which is not the case in most refrigerants.
Many modern refrigerant gases are kept in high pressure sealed systems – up to and over 400PSI – which serves to raise the saturation temperature of the substance in question. This is a marked increase in pressure from old refrigerants such as R-22 which were operated at much lower pressures.
The higher pressures required to operate some of the newer refrigerant gases at useful temperatures is a large part of the reason why it is difficult to retrofit many old cooling appliances with a new refrigerant gas.
Most old chilling solutions simply are not engineered to handle their refrigerant at such high pressures. Modern refrigerators and air conditioners make use of stronger materials – such as thicker metals – to ensure they can handle the stresses imposed by a high pressure refrigerant such as R-410A.
Since cooling solutions need to operate at their Saturation Temperature to make repeated evaporation and condensation feasible, all refrigerants must be pressurized to the extent required where the Saturation temperature for the substance matches realistic achievable conditions.
 

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Fridges General Interest Refrigerators

Refrigeration Basics

Refrigeration is described as the process of removing and transferring heat. Anything that you place in a fridge will have its heat removed and transferred somewhere else. Coldness is defined as a state that happens when heat is absent in an object. These principles are important in refrigeration basics 101, so let’s learn how it works.
How does refrigeration work? There are several things that make it work. First, the cold temperature in the refrigerator causes the heat molecules within the objects inside to flow to the cold areas of refrigerator. This process of heat flow drives the refrigeration cycle, and is called conduction. It acts similar to the flow of water when being transferred from one container to the other. Another process used in refrigeration is convection. This happens when heat is carried away and removed by air particles. Refrigeration works by creating an object that is colder than the object placed inside the fridge in order to allow the heat transfer process to work its magic. All these processes rely on the presence of a refrigerant.
Refrigeration BasicsAmmonia refrigeration basics are based on a looping system that has four primary components, namely condenser, compressor, evaporator, and the metering device. The condenser exchanges heat by removing heat particles from compressed gas and condenses the gas into liquid. The refrigerant liquefies by undergoing a cooling process below the saturation temperature, which remains relative to the pressure created by the compressor. This causes heat from the evaporator to transfer to the cooled refrigerant.
The compressor is one of the most important refrigeration parts. It acts as a compression device for the refrigerant gas by employing pistons to press the flow of air. It raises the pressure of the refrigerant gas, causing the saturation temperature to increase so that it is higher than the air or cooling liquid used by the condenser. This component also enhances the flow of the refrigerant by pumping it throughout the looping system.
An evaporator causes the liquid to evaporate into cold gas, which causes the cooling process. Then the metering device restricts the air flow by making the refrigerant gas flow to a small hole, causing a decrease in pressure. As the pressure drops, it forces the high pressure liquid refrigerant to go through the small hole, losing most of its pressure in the process. This not only reduces the pressure but also makes the refrigerant’s surface area increase dramatically.
Many people have expressed interest in refrigeration basics and have decided to become refrigeration repairmen. If you want to pursue this career, you need to study and enroll yourself in a refrigeration repair course. Next, you need to get some experience in the repair and handling of refrigerators, coolers, and ice makers.
You should have a better understanding of how refrigeration works now. The concepts that you’ve learned today can help you troubleshoot the problem if something goes wrong with your fridge or even help you decide to take a shot at becoming a refrigeration professional.