CHEM Multiple Effect Evaporation Plants with Thermal Vapour Recompressors save heating steam by repeatedly using the same quantity of heat from effect to effect. The condensation heat can also be recovered, if the vapours of a boiling chamber are compressed to the higher pressure of the heating chamber according to the heat pump principle. The saturated steam temperature corresponding to this pressure is also higher and the vapour can be reused for heating several times. Steam Jet Vapour Recompressors are frequently used for this purpose. Jet Compressors operate at very high flow velocities and have no moving parts. Construction is simple and operation reliable. Chem Evaporation Plants are equipped with jet compressors developed and designed in our own laboratory. We hence have expert knowledge about the behaviour of our jet compressors over changing operating conditions. This enables us to guarantee that our evaporation plants are designed to operate correctly over a wide range of application at a high efficiency. A certain quantity of steam is required to operate a jet compressor. This represents the heat input to the plant and can be calculated from the available motive steam pressure and the required compression ratio. Due to the presence of this motive steam in the mixed flow, more vapours will be evaporated than the compressor can entrain.