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How Frost Affects Refrigeration Evaporator And The Ways Through Which It Gets Controlled
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The function of the evaporator, in the Friga Bohn refrigeration products, is to transfer, in an efficient manner, heat to the refrigerant (which is phase-changing) that flows via a refrigerator, within a refrigerant system. This heat comes from the surrounding area of the refrigerator system. So we can say that the heat gets absorbed into a refrigerator system, at the evaporator. The evaporator consists of refrigerant tubes having extended surfaces, and these extended surfaces are also called as fins. The refrigerant absorbs heat and changes in phase, from liquid-to-vapor. At the evaporator's entrance is located near a device that controls the refrigerant's flow, via the evaporator. This metering device also provides for total vaporization of the fluid, before it exits the evaporator.
Energy Saving and Evaporator
The evaporator is an essential and key component of a refrigeration system. Its efficiency contributes towards the energy saving capability of the evaporator. The industrial and commercial evaporator systems are made up of components like expansion device, evaporator coil, defrost heaters, fans, and one liquid-line solenoid valve. The evaporator has an efficiency controller, which is used to control and to manage the functioning of the companies. Hence, the evaporator can provide the best energy efficiency, at the lowest costs. Friga Bohn refrigeration products possess the best quality and are used widely for residential and commercial refrigeration systems.
The occurrence of frost cannot be avoided, on any evaporator. Frost is a cause of the increase in the inefficiency of the coils of the evaporator. The dew starts to get collected on the cool surface of the evaporator when the temperature of the coil of the evaporator drops below the temperature of the dew point. The moisture that accumulates on the coil of the evaporator can also get solidified, if the evaporator's coil temperature drops well below the
optimum temperature, to a greater extent.
When the first layer of thin ice gets formed on the surface of the evaporator, its efficiency actually gets improved. This first layer is actually a good conductor of heat but causes an increase in the evaporator tube's surface area. Hence, the airflow area around the evaporator tube gets reduced. There will also be a marginal increase in the velocity of the air, through the coil. All of this will contribute towards an increase in heat transfer, to the refrigeration evaporator.
The next layers of the frost that will get accumulated on evaporator will be like snow and will have a more crystalline structure. These frost layers will also be porous. These subsequent layers of ice will cause a decrease in the heat-absorption ability of the evaporator and will cause its insulation. The frost is also called as hoar frost or radiant frost. So as we can see, there will be a marginal increase in the efficiency of the evaporator at the beginning. But over a certain period, more hoar-frost accumulation will create an insulating effect on the evaporator's coil. The evaporator coil will get colder, and there will be a suction-pressure drop.
As there is a greater insulating effect, the evaporator coil's temperature must get reduced, so that the system can attain its desired and original temperature, within the refrigerated space. As there is insulation, the difference between the temperature of the refrigerated space and the evaporator coil will get increased.
Sublimation is a natural process that signifies the transition of a substance from its solid state to a vapor state, directly. The frost from the evaporator undergoes this sublimation phase change, and will also return the moisture to the inner refrigeration space. The defrost systems also discard this melted frost down the drain. CPVC pipe fitting suppliers in Qatar offer you the best-in-class fittings for your process flow, and commercial refrigeration systems use them for their superb reliability, in the most extreme temperature conditions.
Also, the controller closes when the inner refrigeration space's temperature reaches the optimum level. The evaporator fans and the solenoid valve of the refrigeration system get closed. Only the compressor operates and helps in the vaporization process. The process removes all the liquid refrigerants found within the suction line and the evaporator.
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