Wiped-Film Rotating-Disk Evaporator for Water Reuse

摘要

Two different disk designs for the wiped-film rotating-disk evaporator were built in order to compare their heat-transfer performance. In one design, 1 mm-thick brass disks were spun-formed on a spherical mold; in the other, 0.8 mm-thick brass disks were made flat and the outside flange was formed by spinning. The heat-transfer coefficient was not influenceed by the disk shape, but was affected unfavorably by surface roughness. Its analytical prediction agreed well with experimental results. A conceptual design of a five-effect vapor-compression system to desalt 10 cu m/ day (2500 gallons/day) from seawater was made and costed.