| 165 / | HD | HEAT EXCHANGE |
| DIG 163 | DD | INCLUDING A MEANS TO FORM FLUID FILM ON HEAT TRANSFER SURFACE (E.G., TRICKLE) {8} |
| DIG 177 | DD | .~ Film flows along upper surface of tray {4} |
| DIG 178 | | .~.~ Parallel corrugated vertical sheets formed fluid passage therebetween |