ASEM Stamp Industrial Shell Tube
Evaporator Dry Type Heat Exchanger
According to the type of cooling medium is different, the
evaporator can be divided into two categories:
(1) cooling liquid refrigerant evaporator. Used to cool liquid
refrigerant - water, saline or ethylene glycol
solution. This type of evaporator commonly used horizontal
evaporator, riser evaporator and spiral tube
evaporator and so on.
(2) Evaporator for cooling air. This type of evaporator has a
cooling pipe and a chillers.
First, the horizontal evaporator
1, its horizontal shell and tube condenser with the structure is
basically similar. According to the liquid
supply can be divided into shell and tube evaporator and dry
evaporator two. Horizontal shell and tube
evaporator is widely used in closed brine circulation system. Its
main features are: compact structure,
liquid and heat transfer surface contact with high heat transfer
But it needs to fill a large number of refrigerants, liquid column
on the evaporation temperature will have a
certain impact. And when the brine concentration is reduced or the
salt water pump is shut down for any
reason, the brine may be frozen in the tube.
If the refrigerant is freon, the freon dissolved lubricating oil is
difficult to return to the compressor. Also
need to stop working when cleaning.
2, dry Flon evaporator main difference is: the refrigerant flow in
the tube, while the refrigerant in the tube
outside the flow. After the flow of the freon liquid from the lower
end of the side of the end into the
evaporator, after several processes from the top of the end of the
cover, the refrigerant in the tube with
the flow and continue to evaporate, so the wall is part of the
possession of steam, so , Its heat transfer
effect as full liquid.
However, it has no effect on the evaporative temperature of the
liquid column and is better due to the
higher flow rate of Freon (≥4 m / s).
In addition, due to the tube filled with a large number of
refrigerant, thereby slowing the risk of freezing.
This kind of evaporator refrigerant charge only enough liquid type
1/2 ~ l / 3 or less, so called "dry