Mechanical Vapor Recompression Evaporators

Mechanical Vapor Recompression (MVR) Evaporators

Mechanical vapor recompression (MVR) evaporators use electricity or a gas turbine to drive a compressor that recycles the heat in the evaporator. This energy-efficient, cost-saving system has made MVR evaporators increasingly popular as energy costs continue to rise.

Benefits of Mechanical Vapor Recompression Evaporators

Significant energy and cost savings

Ideal for low boiling-point rise liquids

How Mechanical Vapor Recompression Evaporators Work

The principle behind mechanical vapor recompression (MVR) evaporators is simple. Vapor from an evaporator is compressed (with a fan or compressor) to a higher pressure so that it can be condensed in the evaporator heat exchanger.

The compression ratio required is comprised of three components:

  • The boiling-point rise, i.e., the temperature of the boiling liquor minus the temperature of boiling water at the same pressure
  • The delta-T (change in temperature) required for heat transfer
  • The pressure drop in the vapor pipe to and from the compressor

Mechanical recompression works best in a system with low boiling point elevation and where larger heat transfer surfaces can be used to lower the differential temperatures in the heat exchanger.