Heat transfer promoters and method of using the same

• US 4,601,933 A
• Filed: 10/18/1984
• Issued: 07/22/1986
• Est. Priority Date: 10/19/1983
• Status: Expired due to Term

• Current Assignee: Kunio Mori, Nakamura Yoshiro, Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kunio Mori, Kabushiki Kaisha Toshiba (Toshiba Corporation), Yoshiro Nakamura
• Inventors: Mori, Kunio, Mochida, Yoshio, Okumura, Minoru, Miyazaki, Matsuo, Nakamura, Yoshiro
• Primary Examiner(s): Page, Thurman K.
• Application Number:
  US06/662,027
• Time in Patent Office: 642 Days
• Field of Search: 427/388.1, 427/307, 427/309, 138/145, 138/178, 165/133, 165/60, 252/74, 252/71, 428/35, 428/36
• US Class Current: 428/34.1
• CPC Class Codes: C09K 5/04 the change of state being from liquid to vapour or vice versa
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]

Abstract

A heat transfer promoter composition comprises a triazine-dithiol derivative represented by the general formula ##STR1## wherein R represents --NHR'"'"' or --NR'"'"'₂ wherein: R'"'"' is a hydrocarbon group; M is selected from the group consisting of hydrogen, alkali metals, and alkaline earth metals; and at least one of M groups is alkaline metal or alkaline earth metal. This heat transfer promotor is applied to that surface of a condenser tube to be contacted by a vapor to be condensed.

Claims

1. A method of promoting the heat transfer of a heat transfer tube used in a vapor-liquid condensation system which comprises the step of treating a gas-condensing surface of the heat transfer tube with a heat transfer promoter containing a triazine-dithiol derivative represented by the general formula ##STR5## wherein R represents --NHR'"'"' or --NR₂ '"'"' wherein:

R'"'"' is a hydrocarbon group;

M is selected from hydrogen, alkali metals, and alkaline earth metals; and

at least one of M groups is an alkali metal or alkaline earth metal.

2. A method according to claim 1 wherein said R'"'"' is a hydrocarbon group containing from 4 to 18 carbon atoms.

3. A method according to claim 1 wherein said R'"'"' is a butyl group, oleyl group, decyl group, octyl group or dodecyl group.

4. A method according to claim 1 wherein said M is H, Li, Na, K, 1/2Mg, 1/2Ca or 1/2Ba.

5. A method according to claim 1, further comprising, before said step of treating, the step of removing an oxide film from the gas-condensing surface of the heat transfer tube.

6. A method according to claim 1, wherein said step of treating comprises immersing said tube for 30 minutes in a 10³¹ 3 M solution of said triazine-dithiol derivative.

7. A heat transfer device, comprising a metallic heat transfer tube having a gas-condensing surface and having on said surface a heat transfer promoter comprising a triazine-dithiol derivative represented by the general formula ##STR6## wherein R represent --NHR'"'"' or --NR₂ '"'"' wherein:

R'"'"' is a hydrocarbon group;

M is selected from hydrogen, alkali metals, and alkaline earth metals; and

at least one of M groups is an alkali metal or alkaline earth metal.

8. A heat transfer device according to claim 7, wherein said R'"'"' is a hydrocarbon group containing from 4 to 18 carbon atoms.

9. A heat transfer device according to claim 7, wherein said R'"'"' is a butyl group, oleyl group, decyl group, octyl group or dodecyl group.

10. A heat transfer device according to claim 7, wherein said M is H, Li, Na, K, 1/2 Mg, 1/2 Ca or 1/2 Ba.

11. A heat transfer device including a heat transfer tube having a gas-condensing surface produced by a process comprising the step of treating the surface with a heat transfer promoter containing a triazine-dithiol derivative represented by the general formula ##STR7## wherein R represents --NHR'"'"' or --NR₂ '"'"' wherein:

R'"'"' is a hydrocarbon group;

M is selected from hydrogen, alkali metals, and alkaline earth metals; and

at least one of M groups is an alkali metal or alkaline earth metal.

12. A heat transfer device according to claim 11, wherein said R'"'"' is a butyl group, oleyl group, decyl group, octyl group or dodecyl group.

13. A heat transfer device according to claim 11, wherein said M is H, Li, Na, K, 1/2 Mg, 1/2 Ca or 1/2 Ba.

14. A heat transfer device according to claim 11, wherein the process further comprises, before said step of treating, the step of removing an oxide film from the gas-condensing surface of the heat transfer tube.

15. A heat transfer device according to claim 11, wherein said step of treating comprises immersing said tube for 30 minutes in a 10^-3 M solution of said triazine-dithiol derivative.