Singk-efTect maporators now being used for the production of fresh water from sea or brackish UXUCT work umconomiulfy. For this reason they are not considered for the production of fresh uarer on a large scak. Howcwr X?I evaporators may produoz o distillate which is not too expensive if lhac is waste hut and tooling *ater in sufficient quantity. A number of parameters influ-nce the cfSciency of this t>pc of cxaporator: namely the quantity md tcmpe~turc of heated uata, degrw of salinity of the sea war. magnitude of tk ncuum, inttmsity and temperature of the cooling watercirculation, amount of feed water or brine withdrawn, feed water Iempcrature, thickness of iaycr. chemical composition and structure of chc waler s&e. and intensity of circulaling brine flow. Evapontotsofthistypcmaybtusedbotha~ship and on land. on condition that a sufikiit amount of waste but and cooling water ace availabk. Einstuligc Vcrdampfer zut Eraugung van Silsswancr aus Sa odcx salzhalligan Wassa arMten unrentabel. Dahcr findcn sic gcwabnlich keinc Anwcndung; aber in F&Hen, wv man i%cr Abfalfv&me bci ausreicbcnder Ktihlw asscrmengc verfiigt. ist es miiglich, mit diesea Dcstilliaap paratm ein billigcs Dcstillat N erhahen. So ein Fall is( zB. auf Motorhandclsxhiffcn anzuMien.