Desalination arrangement by mechanical compression of vapour MVC having a low compression ratio, characterized in that it comprises: a latent heat exchanger comprising at least one evaporator-condenser tube or chamber having an evaporating face that is covered, at least in part, by microgrooves or micro undulations, the microgrooves or micro undulations being configured to allow a saline solution to be desalinated to flow through them forming saline solution menisci such that water vapor evaporates from the ends of the menisci, and a condensing face that is covered, at least in part, by microgrooves or a capillary structure, the microgrooves or capillary structure being configured to allow water vapour to condense in a capillary condensation regime on the microgrooves or capillary structure such that water menisci are formed therein; and at least one fan with a compression ratio equal to or less than 1.11, the at least one fan being configured to suck primary vapour from the evaporating face of the at least one evaporator-condenser tube or chamber and increase its temperature and pressure to generate secondary vapour that is supplied to the condensing face of the at least one evaporator-condenser tube or chamber, such that the compression ratio between the secondary vapour and the primary vapour is equal to or less than 1.11; wherein the supply of the saline solution on the evaporating face is made inside the microgrooves or micro undulations without forming thin water films on the evaporating face; wherein a wall section of the at least one evaporator-condenser tube or chamber has the shape of a continuous zigzag, crenellated or corrugated continuous line and is configured to have a thermal path, between the point of condensation on the water menisci where the condensation latent heat is released and the upper ends of the saline solution menisci where evaporation occurs and absorption of the evaporation latent heat takes place, that is free from water layers; and wherein the latent heat exchanger is configured to have a heat transfer coefficient that allows a condensation and evaporation cycle to be performed with a thermal rise between the primary vapour and the secondary vapour between 0.5 °C and 0.8 °C, or less, plus a temperature differential related to the boiling point elevation of the saline solution. a latent heat exchanger comprising at least one evaporator-condenser tube or chamber having an evaporating face that is covered, at least in part, by microgrooves or micro undulations, the microgrooves or micro undulations being configured to allow a saline solution to be desalinated to flow through them forming saline solution menisci such that water vapor evaporates from the ends of the menisci, and a condensing face that is covered, at least in part, by microgrooves or a capillary structure, the microgrooves or capillary structure being configured to allow water vapour to condense in a capillary condensation regime on the microgrooves or capillary structure such that water menisci are formed therein; and at least one fan with a compression ratio equal to or less than 1.11, the at least one fan being configured to suck primary vapour from the evaporating face of the at least one evaporator-condenser tube or chamber and increase its temperature and pressure to generate secondary vapour that is supplied to the condensing face of the at least one evaporator-condenser tube or chamber, such that the compression ratio between the secondary vapour and the primary vapour is equal to or less than 1.11; wherein the supply of the saline solution on the evaporating face is made inside the microgrooves or micro undulations without forming thin water films on the evaporating face; wherein a wall section of the at least one evaporator-condenser tube or chamber has the shape of a continuous zigzag, crenellated or corrugated continuous line and is configured to have a thermal path, between the point of condensation on the water menisci where the condensation latent heat is released and the upper ends of the saline solution menisci where evaporation occurs and absorption of the evaporation latent heat takes place, that is free from water layers; and wherein the latent heat exchanger is configured to have a heat transfer coefficient that allows a condensation and evaporation cycle to be performed with a thermal rise between the primary vapour and the secondary vapour between 0.5 °C and 0.8 °C, or less, plus a temperature differential related to the boiling point elevation of the saline solution.