| 165 / | HD | HEAT EXCHANGE |
| DIG 510 | | HAVING HEAT EXCHANGE SURFACE TREATMENT, ADJUNCT OR ENHANCEMENT {7} |
| DIG 511 | DD | .~> Polished heat transfer surface |
| DIG 512 | DD | .~> Coated heat transfer surface {2} |
| DIG 515 | DD | .~> Patterned surface (e.g., knurled, grooved) {1} |
| DIG 517 | DD | .~> Roughened surface |
| DIG 518 | DD | .~> Conduit with discrete fin structure {5} |
| DIG 529 | DD | .~> With structure for promoting turbulence and/or breaking up laminar flow adjacent heat transfer surface {1} |
| DIG 531 | DD | .~> With wicking structure |