HEAT TRANSFER TUBE CONSTRUCTED OF TIN BRASS ALLOY
The present invention provides a heat transfer tube constructed of a tin brass alloy, which results in a heat transfer tube suitable for ACR systems that is superior in resistance to formicary corrosion.
1 . A formicary corrosion resistant heat transfer tube comprising a tin brass alloy.
2 . The heat transfer tube of claim 1 , comprising up to 3.0% tin.
3 . The heat transfer tube of claim 1 , comprising from 0.8 to 1.4% tin.
4 . The heat transfer tube of claim 1 , comprising from 86% to 90% copper.
5 . The heat transfer tube of claim 1 , comprising from 86% to 89% copper.
6 . The heat transfer tube of claim 1 , comprising from 9.6% to 13.2% zinc.
7 . The heat transfer tube of claim 1 , comprising up to 35% zinc.
8 . The heat transfer tube of claim 1 , comprising no more than 0.05% lead.
9 . The heat transfer tube of claim 1 , comprising no more than 0.05% iron.
10 . The heat transfer tube of claim 1 , comprising no more than 90% copper, no more than 3.0% tin, and no more than 13.2% zinc.
11 . The heat transfer tube of claim 1 , consisting essentially of between 86.0% and 90.0% copper, between 0.8%-3.0% tin, no more than 0.05% lead, no more than 0.05% iron, no more than 0.35% phosphorus, and the remainder zinc.
12 . The heat transfer tube of claim 1 , consisting essentially of between 86.0%-89.0% copper, between 0.8%-1.4% tin, no more than 0.05% lead, no more than 0.05% iron, no more than 0.35% phosphorus, and the remainder zinc.
13 . The heat transfer tube of claim 1 , wherein the tube is formed from alloy C422.
14 . The heat transfer tube of claim 1 , wherein the tube is formed from alloy C425.
15 . A heat exchanger assembly comprising the heat exchange tube of claim 1 , further comprising a plurality of plate fins and at least one tube sheet.
16 . The heat exchange tube of claim 1 , wherein the tube is formed by welding, extrusion or cast-and-rolling.
17 . A heat exchanger assembly for use in ACR systems, the heat exchanger comprising a formicary corrosion resistant heat transfer tube comprising a tin brass alloy.
18 . A method of making a heat exchanger comprising:
forming a heat transfer tube wall from a tin brass alloy.
19 . The method of claim 18 wherein the tube allow is formed from alloy C422
20 . The method of claim 18 , wherein the tube wall comprises up to 3.0% tin.
21 . The method of claim 18 , wherein the tube wall comprises from 0.8 to 1.4% tin.
22 . The method of claim 18 , wherein the tube wall comprises up to 35% zinc.
23 . The method of claim 18 , wherein the tube wall consists essentially of between 86.0% and 90.0% copper, between 0.8%-3.0% tin, no more than 0.05% lead, no more than 0.05% iron, no more than 0.35% phosphorus, and the remainder zinc.
24 . The method of claim 18 , wherein the heat exchanger is installed in an ACR system.