Abstract
In the present study the following arrangements are considered: a- Multi effect vapor thermocompression b- Multi effect boiling c- A hybrid multi-effect boiling/vapor thermocompression. In arrangement "c" the effects operated at pressures higher than atmospheric pressure are of the vapor thermocompression type while these operated at sub atmospheric pressures are of the multi effect boiling type. Thermodynamics relations for the three systems under consideration are analyzed. The numerical study includes the solution of these equations together with calculations of the heat transfer areas required for the units. The enter effect variations of the thermodynamics properties of water are accurately computed using special subroutines designed for this purpose.