Heat exchanger having a plastics membrane
US4515210A · kind A · utility
17Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Aug 12, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F21/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The wettability of polyolefin or polyester film for use as a heat exchange membrane, e.g. tubes or sheets, in a heat exchanger is increased, generally to a surface tension reading in excess of 70 dynes/cm, by treating the surface of the film with a strong oxidizing agent, particularly gaseous sulphur trioxide. The heat transfer coefficient is thereby improved. Tubes of such plastics material having a treated outer surface and an untreated inner surface are particularly useful for exchanging heat between a liquid flowing over the outer surface and a gas or vapor condensing within the tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.