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The evaporator type of works of the

2012/9/4 12:13:59  Origin:  Publisher:

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Depending on the cooling medium of different types, the evaporator can be divided into two categories:
  (1) cooling the liquid contained refrigerant evaporator. For cooling the liquid contained refrigerant - water, brine, or an aqueous glycol solution. Commonly used type of evaporator horizontal the evaporator, riser evaporator and the evaporator coiled.
  (2) cooling the air evaporator. Type of evaporator cooling exhaust pipe and the cooling fan.
A horizontal evaporator
  1, its basic structure with horizontal shell and tube condenser. Into the shell and tube evaporator for liquid and dry evaporator two. Horizontal shell and tube evaporator is widely used in the closed brine circulation system. Its main features are: compact structure, the liquid in contact with the heat transfer surface heat transfer coefficient. But it needs to be filled with a lot of refrigerant liquid column will have a certain impact on the evaporation temperature. And when the brine concentration is reduced or salt water pump outage, brine within the tube may be frozen. Refrigerant freon, freon dissolved within the lubricating oil is hard to return to the compressor. In addition, cleaning need to stop working.
  2, dry Freon evaporator main difference is that: the flow of the refrigerant in the tube to contain the flow of the refrigerant in the outside tube. Throttled the freon liquid from the lower portion of the side of the end cap into the evaporator, and after several processes drawn from the upper portion of the end cap, the refrigerant flowing within the tube along with continuous evaporation, so the part of the wall as vapor occupied, so , its heat transfer effect is not as good as the full liquid formula. But it is the impact of the liquid column of the evaporating temperature and Since flon high velocity (≥ 4m / s), the oil return is better. Further, since the pipe outer charged into a large number of secondary refrigerant, thereby slowing the risk of freezing. Filling amount of the refrigerant within this evaporator simply flooded 1/2 ~ l / 3 or less, and so called "dry-type evaporator.
Second, vertical tube evaporator
  Riser-and helical type evaporator common is evaporated, the refrigerant within the tube immersed in Sheng cabinets (or pool, tank) loaded with refrigerant, the entire evaporator tube bank in order to ensure the secondary refrigerant in the tank certain speed loop, inside welding longitudinal bulkhead and fitted with a propeller stirrer. The flow rate of the secondary refrigerant is generally 0.3 ~ 0.7m / s, in order to enhance the heat transfer.
  Both evaporator can only be used for the open-cycle system, it must be non-volatile substances contained refrigerant, is commonly used, such as saline, and water. Evaporator tubes susceptible to oxidation, such as with saline, easy to absorb moisture and the brine leaving the concentration decreased. Both the evaporator can be directly observed contained the flow of refrigerant, widely used in brine refrigeration system using ammonia as a refrigerant.
Cooling calandria
  Cooling the exhaust pipe is used for cooling air in an evaporator. Widely used in the cryogenic refrigerator, the refrigerant flow in the cooling calandria tubes and evaporated, and the outside of the tube as the heat transfer medium is cooled by the air as the natural convection.
  Cooling calandria biggest advantages of simple structure, ease of production, less shrinkage caused by the non-packaged food storage Treasury. Lower heat transfer coefficient, the exhaust pipe and defrost operation difficult, is not conducive to automate. For light pipe or coiled finned tube; Freon system, mostly using direct ammonia cooling system with seamless steel tubes welded around the chip the sets-piece brass finned tube group.
  1, snake-tube calandria
  Snake-tube gravity for pipe jacking or ammonia pump for liquid can; single row and double row snake calandria tube wall can be used for the next intake on the ammonia pump for liquid systems and gravity fluid supply system, a single snake-tube row ammonia pump tube can also be used to make progress under a fluid supply system and thermal expansion valve for the liquid system.
  Snake tube type exhaust pipe is simple in structure, easy to produce, save a smaller amount of liquid applicability. Its main drawback can not be for the next segment of the calandria vapor generated leads must be discharged through the exhaust pipe full length before, so the heat transfer coefficient, vapor-liquid two-phase flow resistance.
  2, U-shaped rows of tubes used U-shaped discharge pipe smooth and seamless steel pipe constituted by two or four.
  Row of U-shaped top tube advantage frosting evenly, fabrication and installation more convenient, a small amount of fluid-filled, about 50% of its volume under applicable gravity fluid supply system and ammonia pump on the ammonia refrigeration system in the cold access to a wider range of applications. But more effective space occupy the Treasury, and the upper row of tubes is not easy to defrost.
Fourth, the cooling fan (air coolers)
  The cooling fan is a multi-axial fan cooling calandria equipment. It relies on a fan forced the coffers air flowing through the cooling cabinets calandria tubes for heat exchange, to cool the air, so as to achieve the purpose of reducing the storage temperature.
  The cooling fan cooling air can be divided into dry, wet, and wet and dry mixed three. Wherein the refrigerant or a secondary refrigerant flow within the discharge pipe, known as dry-type chiller condenser outside air through the wall; directly spraying contained refrigerant liquid and the heat exchange with air, called wet chiller; hybrid-type chiller cooling exhaust pipe outer contained refrigerant spray device. Here are the currently widely used in cold storage of dry-cooling fan.
  The ceiling and floor are two types of cold storage of dry cooling fan can be divided into its installation position. By air cooling pipes, ventilators and defrosting device, and cooling fan cooling calandria are set chip. Large dry-cooling fan is often floor-to-ceiling.

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