UAR - Model DX -Shell And Tube Evaporator And Direct Expansion Teyp Evaporator

Evaporator: Which cold water flows in the shell and the tube.In the dry evaporator system since the tube is filled with a large amount of refrigerant, the possibility of  been frozen has declined. The refrigerant charge in the evaporator only needs to be 1/2~l/3 or less of the liquid than the full-liquid type. Thus it is called a "The dry type evaporator". The secondary flanging, multiple flanging, and fragmentation technology are the latest advanced technologies. The large-scale dry evaporator copper tube adopts small-diameter light tube or a light tube with internal panel to ensure that all products are highly efficient, energy saving, environmental protection, strong anti-pollution ability, and easy to maintain, requirements. The large-scale dry evaporator can be designed and manufactured according to the special requirements of customers.

1. By operating the dry evaporator refrigerant tube in a high temperature and vacuum environment could ensure that there are no other impurities and moisture in the evaporator.
2. Due to the high-purity and seamless copper tubes, the dry-type evaporator copper tubes tremendously gains resistance to corrosion and are not easily to break.
3. After been pressed by the ultra-high hydraulic pressure or mechanical expansion, the tube, the dry evaporator fins and the copper tube are in close contact with each other , as the result the heat exchange effect is also very effective.
4. The outer frame end plate of the dry evaporator made of high-quality and high-purity steel plates are not easy to be corroded, the assembly and combination are very simple, and the strength is high.
5. Based on single and double reflux systems are designed according to the design flow rate. The internal loop of the dry evaporator has low water resistance and excellent heat exchange performance.
   

The flooded evaporator takes water in the tube, and the refrigerant evaporates outside of the tubes, so the heat transfer surface is in contact with the liquid refrigerant. Generally, the amount of refrigerant filled in the shell is about 55%-65% of the effective volume of the cylinder. The refrigerant liquid absorbs heat and vaporizes through the liquid separator on the top of the cylinder and returns to the compressor. Easy operating, high and heat transfer coefficient.

1. When the evaporating temperature of the refrigeration system is lower than 0?, the water in the pipe is easy to freeze and damage the evaporating pipe
2. The refrigerant charge is large;
3. Affected by the height of the refrigerant liquid column, the evaporation temperature at the bottom of the cylinder is too high, which will reduce the heat transfer temperature difference
4. Oil will accumulate in the lower part of the evaporator cylinder, so a reliable oil return measures must be taken, otherwise the safety of the system will be affected and down to low level.
5. The refrigerant of the dry evaporator flows in the tube, and the water flows outside the cluster tube. The refrigerant flow usually has several processes. Due to the gradual vaporization of the refrigerant liquid, the more upward, the more the number of the tubes will be flooded.  In order to increase the heat transfer on the water side, a number of baffles are arranged on the outer side of the heat transfer tube of the cylinder to make the water flow across the clusters tubes multiple times.

1. The Lubricating oil enters the compressor with the refrigerant, generally will not cause any problem of oil accumulation
2. The needs of charging refrigerant  is less, generally only about 1/3 of the flooded-type;
3. When t0 is around 0°C, the water will not freeze.

UAR dry evaporator, evaporator has higher evaporation rate, stable operation, fully automatic control, low power consumption, low evaporating temperature, and highly effective, easy to maintained and last long time.