Combined Evaporators

The Vahterus Combined Evaporator has been developed to reduce the overall size of a traditional system with an external separator and also to minimise the refrigerant charge. It combines both the evaporator and separator functions within one shell. This compact design enables easy integration into compact designed chiller packages and also provides many other benefits such as savings on insulation and customer piping costs.

This innovation with minimal refrigerant charge both satisfies the market demand for the right system solution and increases the acceptance of using the natural refrigerant NH3. The Vahterus Combined Evaporator uses fully welded plates and a protective shell around the plate pack. This totally avoids ammonia permeation through gaskets during the entire lifetime of the evaporator.

The fully welded Vahterus Plate & Shell® evaporator is placed inside a tubular shell and submerged into liquid refrigerant. In the Combined Evaporator there is a separation area above the plate package to ensure that the compressor receives only dry suction gas. To accommodate these extra functions, the shell is made larger than the diameter of the evaporator plate stack.

To minimise the final shell diameter, a highly efficient separation is required. In the Vahterus Combined Evaporator this is achieved by using a special separation system that has been developed by Vahterus. To additionally minimise the refrigerant charge, the Vahterus Combined evaporator offers an ammonia- and oil-resistant filling material. This dramatically reduces the amount of necessary refrigerant while still performing at the same high level.

Benefits

  • Safe solution – no ammonia leaks due to the gasket permeation
  • Compact size and easy to install
  • Small refrigerant charge
  • No external piping
  • Easy oil separation
  • Easy to insulate

Reference cases

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