Heat engineering apparatus for carrying out thermodynamical processes comprising a pair of mutually opposite phase transitions of a work medium

In a heat-engineering apparatus comprising elements designed, sized and arranged for carrying out thermodynamic processes in which a work medium undergoes mutually opposite phase transitions comprising evaporation and condensation without the need to provide an enclosing vessel for the apparatus, the apparatus comprising casings consisting of confining plates and spacers therebetween, phase transition compartments in said casings, passages connecting pairs of said phase transition compartments with one another so as to form a number of work chambers, passages connecting said work chambers in series to as to form stages of mutually opposite phase transitions, and passages for introducing and withdrawing said work medium into and from said phase transition compartments;

• the improvement comprising means for precluding the need for transition third compartments, said means being characterized in that at least two adjacent casings enclose an even number of and not less than four phase transition compartments in superimposed relationship, said work medium introducing passages being delimited from the interior of said casings by said confining plates and said spacers, and said passages connecting the members of the pairs of phase transition compartments being orifices free from pipe structure in partitions separating the former from one another within said casings.