Plate type evaporators are widely used for needs such as small refrigerators, freezers and soda sources used in places where mass production is being done. Plate type evaporators; They are also used by being installed in groups or clusters when storage areas with low temperature are installed. Depending on the needs of use, this type of refrigerant piping can be connected in series or parallel.
Plate type evaporators can be used in refrigerated trucks and ship warehouses, as well as for the storage of refrigerated and frozen food products. Bare tube type coils are small evaporators using copper tubes. Bare tube coils can be used for cooling the air or a liquid. Steel pipes are used in evaporators in systems where ammonia is used as the coolant, or in large evaporators containing other types of coolers. A thin air layer sticks to the surface of a coil by acting as an insulator and slowing down the heat transfer process, which is primarily dependent on the surface area and temperature difference.
One of the methods used to compensate for or compensate for the transmission loss caused by this thin air layer is to increase the surface area. To this end, a fin is added to the evaporator tubes. The addition of flaps does not eliminate the air layer, but even increases the tack area, but provides more surface area in heat transfer, without increasing the size of the serpentine. Another way to prevent heat transfer loss, caused by air filmin, is to add a fan or ventilator to allow air to move rapidly through the evaporator.
This type of evaporator is a refrigerated evaporator. Depending on the design and use of the serpentine, the fan provides movement through the air serpentine, either by inducing the air or by forcing it out. The use of a fan increases the air flow and the heat transfer from the air to the coolant inside the coil. Because a large amount of air will come into contact with the surface area of the coil. Many manufacturers of serpentines have designed heat transfer units as staggering tube arrays.
Thus, with the use of a ventilator, more air volume can be contacted either with the pipe surface or with the vanes attached thereto. The end result of the coiled or induced air movement in the coil is to allow more of the air temperature to leave the coolant in the coil in a certain time. Liquid cooled serpentines; such as air-cooled coils, depending on the application and application areas. An underwater serpentine has several times the heat extraction capacity of an air-cooled serpentine under similar conditions, as there is greater heat transfer between metals and liquids than between air and metals.