Question

What causes vapor temperature drop in the flashing stage of a Multi-Stage Flash Desalination process?

Answer 1

AS in a multistage flash desalination process .vapor temperature is dropped. while doing flashing the pressure is reduced. due to reduction in pressure the liquid stream converted in to two phase. first is vapor and other is liquid. and both are in equilibrium. when there is phase change from liquid to vapor it takes latent heat and system becomes cooler. for multistage flashing , more and more latent heat is being utilise. the system become more cooler, so in this way vapor leaving from cooler system will have lower temperature. hence there is vapor temperature drop in multistage Desalination process.