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| Why copper and aluminum are used in HVAC coils |
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Posted by: ircasodle - 06-14-2018, 08:23 AM - Forum: aluminium faq
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HVAC coils are often made with copper and aluminum, two metals that efficiently transfer heat. That’s because cost and effective heat transfer are often the key deciding factors in choosing materials for HVAC coils. There are pros and cons to both copper and aluminum, which I describe below.
[img=300x0]http://www.aluminiumstrip-hm.com/wp-content/uploads/2018/04/20-300x300.jpg[/img]
Let’s start with some basics about where the heat transfer takes place in coils. In most HVAC coils, tubes are responsible for 30% of the heat transfer and fins are responsible for the other 70%. That’s because the surface of the fins is larger than the surface of the tubes.
Copper
Pros: Copper coils are stronger, easier to maintain, and more reliable than aluminum coils. Copper has a better heat transfer rate and is easier to repair in the field if the coil is damaged.
Cons: The cost of copper continues to rise, and copper coils require more material than aluminum coils.
Aluminum
Pros: Aluminum offers effective heat transfer at a lower cost than copper. Aluminum is more pliable than copper, so less aluminum is required.
Cons: Aluminum coils are difficult to repair and usually need to be replaced. Aluminum coils are also more difficult to clean and maintain. Aluminum fins can corrode, although this can be prevented with the application of a coating.
Given the pros and cons of copper and aluminum, we often sell HVAC coils that combine copper tubes with aluminum fins. Copper tubes offer the best heat transfer and aluminum fins offer good value. Chilled water coils, hot water coils, condenser coils and evaporator coils typically use copper tubes and aluminum fins. However steam coils and steam distribution coils often run at a higher PSI so we recommend stainless steel tubing depending on the pressure and application.
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| Why are aluminum coils so corrosion resistant? |
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Posted by: ircasodle - 06-14-2018, 08:15 AM - Forum: aluminium faq
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Aluminum coil is actually a very active metal, in the sense that it oxidizes very quickly. This feature, while a weakness for most metals, is actually the key to its ability to resist corrosion. When oxygen is present (in the air, soil, or water), aluminum instantly reacts to form aluminum oxide. This aluminum oxide layer is chemically bound to the surface, and it seals the core aluminum from any further reaction. This is quite different from oxidation (corrosion) in steel or other metals, where rust puffs up and flakes off, constantly exposing new metal to corrosion. Aluminum’s oxide film is tenacious, hard, and instantly self-renewing.
![[Image: e2.jpg]](http://www.coil-aluminum.com/images/e2.jpg)
Therefore, as long as this oxide layer is not damaged, aluminum coil will remain resistant to corrosion. What factors can affect this oxide layer? Basically, extreme pH levels. Very high or very basic environments can destroy this protective layer and it might not renew itself as fast as needed to to keep protecting the alumnium core. Normally, aluminum´s protective oxide layer is generally stable in the pH range of 4,5 to 8,5.
Salt water DOES NOT corrode aluminum coil !
There is a traditional fear in the AC industry about heat exchangers exposed to marine conditions. For sure, aluminum does not corrode in lakes and pools. But, what about seawater? Well, surprising as it may be, seawater does not corrode aluminium, simply because of its neutral pH. Then, why traditional copper coils made of copper and aluminum corrode so much near the ocean, up to the point where the aluminum fins disappear? Will not this happen even more likely to aluminum coils being aluminum a softer metal than copper?
![[Image: t3.jpg]](http://www.coil-aluminum.com/images/t3.jpg)
The reason is a more complex kind of corrosion called galvanic corrosion and saltwater can be a major facilitator for this.
microchannel coils are more corrosion resistant than traditional copper andaluminum coils because
Aluminum is a very stable, low corrosion material due to its natural protective oxide layer.
This protective oxide layer is very stable as long as you keep the surrounding pH between 4,5 and 8,5.
The most frequent cause of corrosion in aluminum is due to galvanic corrosion.
The good news is that if you properly understand how galvanic corrosion works, it is very easy to avoid or at least, minimize.
Galvanic corrosion takes place when:
We have two metals in contact
They are inmersed or surrounded (totally or partially) by an electrolyte (in AC applications the most common would be humidity and salt).
We also know:
The further these metals are in the galvanic series, the stronger the reaction
The anode will be the sacrifice material whereas the cathode will get stronger.
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| 10mm-2600mm width O-H112 hardness 3003 aluminum sheet coil for sale - See more at: ht |
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Posted by: ircasodle - 06-14-2018, 06:16 AM - Forum: Buying Leads
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100mm-2600mm width O-H112 hardness 3003 aluminum sheet coil for sale
haomei aluminium is both a 10mm-2600mm width O-H112 hardness 3003 aluminum sheet coil manufacturer and supplier with 20 years experience. So factory price is available. Besides, we use the finest raw material to improve the product quality.
Details of 2600mm width 3003 aluminum sheet coil
Type Aluminum plate, sheet, coil
Common size 1000*2000mm;1220*2440mm;1250*2500mm and customized
ID 76mm or 152mm
Width 200-2600mm
Thickness 0.2-4.5mm and customized
Technology Hot rolling, clod rolling
Optional Processing Mill finish, Coated, Embossed, Mirror, Brush
Thickness Tolerance 0.05mm
Protection Plastic film covering
Delivery 15-25 days according your quantity
Use Aluminum windows, doors, ship, boat, aircraft, car and others.
![[Image: 5052-aluminum-plate.jpg]](http://www.thick-aluminum-plate.com/images/pic/5052-aluminum-plate.jpg)
Contact
Email:wade@haomeicn.com
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| What is the difference between alloy and aluminum wheels? |
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Posted by: Keganhirl - 06-13-2018, 08:51 AM - Forum: aluminium faq
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There isn't any difference, just two different ways of describing the same thing. The difference will be in how the wheel is formed.
The best wheels are formed by forging which produces a strong wheel and lets the designer use less material so that it's lighter as well. This strength comes from the excellent grain structure produced from hot forging. These wheels are generally very expensive.
Slightly less strong, and very slightly less expensive than forging is billet machining. With these wheels a billet of material is forged into a shape (round in this case) and the wheel is machined out of that piece of material. The grain structure from this process is not as idealized as the one from forging, so it is not quite as strong. There is also a lot of material loss due to machining. These wheels are almost exclusively multi-piece designs.
More affordable wheels are rolled, which is similar to forging but for the rim only, this adds strength and reduces mass on the outside portion of the wheel which reduces rotating mass.
Less expensive than that are vacuum cast wheels. These are formed by pouring molten metal into a mold (usually a sand casting) while pulling a vacuum. This pulls any suspended gas out of the molten aluminum and results in a denser wheel with fewer defects, which results in decent strength.
The least expensive wheels are made using gravity casting. The process is similar to vacuum casting above, but doesn't incorporate the vacuum step. This saves a moderate amount of cost, but has a higher chance of yielding a wheel with small amounts of porosity, which can compromise the strength of the wheel. With a good molten metal practice, these wheels can be just as strong as vacuum cast wheels, but at a lower cost.
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| Why is aluminium preferred over copper for making a heat cable? |
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Posted by: Keganhirl - 06-13-2018, 08:49 AM - Forum: aluminium faq
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The difference between aluminum and copper wire is largely in their usage within utilities, resistance, conductivity, weight and cost. Aluminum is in use by the utility companies for the transmission of electricity since the early 1900’s. Aluminum seems to have more advantages over the older copper wire in terms of weight, flexibility and cost, as it is lighter, more flexible, and less expensive.
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| What is a color-coated aluminum sheet coil? |
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Posted by: ircasodle - 06-13-2018, 08:38 AM - Forum: aluminium faq
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The color-coated aluminum sheet coil is ideal for producing aluminium composite materials. haomei aluminium coil is coated with high quality fluororesin paint which offers good weather resistance.
color-coated aluminum sheet coil is the most popular new material currently. It is especially suitable for interior decoration and AD boards. color-coated aluminum sheet coil refers to the aluminum coil through coating and coloring treatment generally includes PE coated aluminum coil and PVDF coated aluminum coil.
PE(polyester) Coating
PE(polyester) coating:high molecular polymer as monomer and addition of alkyd, is an UV-resistant coating. It can be classified matt and glossy according to coating gloss. The compact molecule structure, makes paint surface luster and smooth，which assure good printing on the panel surface. With an warranty of 8-10 years for weather resistance, it is specially applied for internal decoration and sign board.
PE Color Coated Aluminum Coil:
HAOMEI PE color coated aluminum coil with good PE Paints and high performance of aluminum coil is produced by advanced roller coating. All performance parameters are up to or much higher than related national standards.
![[Image: color_coated_aluminium_coil_4.jpg]](http://coil-aluminum.com/images/color_coated_aluminium_coil_4.jpg)
PVDF(fluorine-carbon) Coating
PVDF(fluorine-carbon) coating :made of fluorine carbon resin, pigment, ester solvent, after high temperature roasting and baking, the paint is solidified to dry film with super weather resistance. PVDF coating also can be classified as traditional PVDF and nanometer PVDF coating.
A．Traditional PVDF Coating, with KYNAR500 PVDF, two or three times for coating and baking, has good properties of anti-acid, anti-alkali and is durable in atrocious weather and environment, keeping 15 years no unwonted fading. In view of these facts, we recommend this panel applied for external wall cladding.
B．Nanometer PVDF Coating, which different with traditional PVDF is the clear coating. It contains nanometer element, which can protect panel from pollution, Because nanometer has self-cleaning effect, It easy to get rid of dust and pollution by raining or water.
To produce aluminium composite panel or aluminum veneers.
– Used in exterior applications for decoration and protection of exterior wall, canopy, roof and pillar, etc.
– haomei coated aluminum coil is also ideal for interior decoration for wall, ceiling, bathroom and kitchen, etc.
– Used in advertising boards or shop front decoration
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| Can we use aluminium foil to roast chicken? |
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Posted by: ircasodle - 06-13-2018, 08:25 AM - Forum: aluminium faq
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aluminum foil is ductile. Foil can be rolled to only 0.007 mm thickness, but will still be completely impermeable and lets neither light, aroma nor taste substances in or out. The metal itself forms a protective oxide coating and is highly corrosion resistant. Different types of surface treatment can further improve these properties
Roast a chicken. Place the raw chicken on a baking pan, and tent it with aluminum foil. This will retain the juices in the turkey while baking, so as to cook completely through without burning. Remove the tent for the last hour of roasting, so that the chicken skin gets browned and crisp.
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| 3003 aluminum coil play an important role in our life |
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Posted by: KamorkasOa - 06-12-2018, 09:20 AM - Forum: Knowledge & Technique
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The main material of 3003 aluminum coil is aluminum-manganese alloy, has a good anti-corrosion on atmosphere, brine, freshwater, gasoline, etc., ranking first in corrosion resistance, is the best anti-corrosion material on aluminum product.
![[Image: coils.jpg]](http://coil-aluminum.com/images/coils.jpg)
The strength of 3003 aluminum alloy coil is not high, the slightly higher strength one are used in industrial pure aluminum, it can not be hardening by heat treatment, usually use the cold processing methods to improve its mechanical properties. 3003 aluminum alloy coil has a high plasticity in the annealed state, a good plasticity in the semi-cold hardening, and a good weldability but a poor machinable performance. 3003 aluminum alloy coil widely used in processing parts or components that needs a good formability, high corrosion resistance and good weldability, like kitchenware, food and chemical processing and storage devices, tanks and cans for transporting liquid products, and a variety of pressure vessels and pipes processed with sheet metal.
Hollow aluminum made of 3003 aluminum alloy coil is one of the necessary materials for insulating glass, its quality is directly related to the effect, service life and thermal insulation function of insulating glass. The main role of 3003 aluminum alloy coil is to separate evenly and support two or more pieces of glass and. Hollow glass is made of high purity aluminum for raw materials, after dozens of craft process, with a flat surface, non-oxidizing and non-corrosive, desiccant has no effect on it, eliminate atomization phenomenon effectively. Hollow aluminum is new type of environmentally friendly building materials products, and has vast market.
Performance advantage
1,Excellent forming processing characteristics, high corrosion resistance, good weldability and conductivity, strength higher than 1100;
2,Excellent anti-rust properties, is a widely used anti-rust aluminum;
3,The surface smooth, plastic good, resistant to pressure;
4,Power battery shell preferred plate, with impact, not easy to rupture and leakage, to meet the power battery shell on the strength and rigidity requirements;
Application:
Bottle cap, beverage cap, cosmetic cover, air conditioning tube, car fuel tank, tank and so on.
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![[Image: 5083-aluminum-plate.jpg]](http://www.aluminum-hot-rolled-plate.com/images/5083-aluminum-plate.jpg)
![[Image: 35053149_10211544009466235_3254183522021...e=5BC38DBA]](https://scontent-ams3-1.xx.fbcdn.net/v/t1.0-0/q85/p261x260/35053149_10211544009466235_3254183522021146624_n.jpg?_nc_cat=0&oh=47839365e6a2f3f0cf199880f7c46f02&oe=5BC38DBA)