FIELD: heat engineering. SUBSTANCE: each second intermediate space between plates 4 forms evaporating space 28 wherein a liquid to be evaporated is distributed over the width of plates 4. The rest of intermediate spaces between plates 4 form condensation spaces 30 for heat-liberating vapor. Distributing chamber 27 is formed inside the extremely top part of each intermediate space between plates 4 that forms evaporating space 28. Distributing chamber 27 passes through all width of plates 4 and is connected with the inlet passageway for a liquid. The passageway passes through the stack of plates 4 and is defined by axially alined openings made in plates 4. Sealing facilities 25 are positioned in the top part of each condensation space 30. The facilities are positioned with a spaced relation to each other. Each sealing facility forms transmitting chamber 29 together with both adjacent plates 4. The transmitting chamber are not in communication with condensation space 30 but is in communication at least with one distributing chamber 27 and one evaporating space 28 through small openings 17 and 18 in plates 4. The heat-liberating vapor can flow to each condensation space 30 from the top through gaps made between sealing facilities 25 that are horizontally shifted with respect to each other. EFFECT: enhanced efficiency. 5 cl, 5 dwg
