What is wire tube evaporators

By article :John Walker

Wire tube evaporators is one of types of heat transfer of refrigeration in HAVC. the structure is same to Wire tube Condensers are made of steel wire ,and steel tube rolled by steel panel , only the function is opposite to Wire tube Condensers Although they are the important component of refrigerator refrigeration circle system ,

The Main material is as the following

1. Main use: widely used in refrigerator, freezer, refrigeration, chiller,

2. Material outer diameter:4.0mm, 4.76mm, 6.35mm, 8.0mm etc
3.material wall thickness:0.5mm, 0.6mm, 0.65mm, 0.7mm etc
4. steel wire:1.2mm, 1.3mm, 1.5mm
5.certification:ISO9001:2008, ISO14001:2004 standard: ASTMA-254
6.Surface treatment: copper coated, Bundy Tube
7.Line steel wire is welded on copper coated steel tube bending, electrophoresis on surface and dusting
8.Salt spray time is more than 72 hours

How does evaporator work ?
For a basic refrigerant cycle shown in figure 1, which is used in many forms in all common air conditioning, refrigeration, heat pump applications. It uses a proper refrigerant that has the capability to change phase from  liquid to gas and from gas to liquid.
For a home air conditioning example, the refrigerant enters the compressor is a low pressure cool gas, where it compressed to a high pressure hot gas, then passes to the condenser. In the condenser coil, the refrigerant phase changes from hot gas at high pressure to hot liquid at high pressure. This condensation causes a large heat rejection to surrounding.
The liquid refrigerant is then passed through a fixed nozzle or expansion device to exit as a cold liquid at a low pressure. Finally refrigerant enters the evaporator at about 70% to 80% liquid and 20% to 30% vapor.
In the evaporator a very large amount of heat is absorbed from surrounding (the indoor air) causing the liquid refrigerant to boil and turn into a gas phase, which is passed to compressor to repeat the cycle again until the indoor air be comfortable and sufficiently cool.

The evaporator works at a constant temperature as long as the pressure remains constant.

Types Of  Evaporators

The evaporators may be classified into a forced convection type or natural convection type, depending on whether  the substance to be cooled lows naturally by difference in density  through the heat transfer surfaces of the evaporator  or forced by pump or fan.

In some kinds of evaporator, the refrigerant flows in the tubes and substance to be cooled surrounding it. But in other cases, substance to be cooled in the tubes and the refrigerant is in the tube. Evaporator are also classified into flooded type and dry expansion type, depending on whether  the refrigerant covers all the surface of heat transfer or some portion of heat transfer surface is having gas being superheated.


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