Gasketed plate heat exchangers


AlfaVap evaporator

AlfaVap semi-welded heat exchangers are rising film plate evaporators and are suitable when concentration and viscosity of media are high.

AlfaVap’s advantage is that they work also when the temperature differential between the hot and cold fluids approaches as low as 2.5°C (4.5°F) meaning that lower grade steam and more effects in series can be used in an evaporation system compared to the shell-and-tube systems. This saves steam costs.


  • Sugar refinery evaporation systems
  • Sweeteners evaporation systems
  • Fruit and vegetable juices
  • Tea and coffee production
  • Bioethanol and caustic evaporation
  • Thermosyphon reboiler

AlfaVap benefits vs. shell-and-tube heat exchanger

  • AlfaVap provides substantially higher thermal efficiency than shell-and-tube units, meaning much less heat transfer area is needed and cost savings
  • The compact, versatile design of AlfaVap means that that transportation, erection and installation costs are drastically reduced
  • AlfaVap heat transfer surfaces are easily accessible for inspection or cleaning
  • Due to low hold-up volume, AlfaVap only requires a very small amounts of cleaning chemicals compared to shell-and-tube
  • Unlike shell-and-tube units, where capacity is fixed, it’s easy to adjust AlfaVap capacity to meet changing needs by simply adding or removing plates on the existing frame
  • Compared to shell-and-tube, AlfaVap plate heat exchangers save up to 50% space (as illustrated above)


How AlfaVap works

The heat transfer area of a gasketed plate-and-frame heat exchanger consists of a series of corrugated plates, assembled between the frame and pressure plates, which retain the design pressure. The sealing between the plates on the AlfaVap alternates between laser welds and gaskets. AlfaVap is tailor-made for evaporation. It has two inlet feed connections located centrally at the bottom of the frame plate and a large outlet for the vapour and concentrate at the top. The heating steam condenses in the welded channels and the evaporating product passes through the gasketed channels. 


Servicing your heat exchangers

Plate heat exchangers have an essential role in most applications. If they function poorly, they may lead to lower product quality, reduced safety and higher energy costs. And if they fail, they can lead to costly downtime and major losses in production. This makes it important to perform maintenance – and important to do it correctly.

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