multi port tube-channel condensing unit is manufactured

  • The summer of 1986 found me in Collierville, Tennessee, where I was delivering a series of classes to the engineers and quality-control personnel employed by Carrier Corp.'s residential air-conditioning plant. While I was discussing condenser coils and the advantages of Carrier's then spine-fin all-aluminum coils, one of the engineers raised his hand and pointed out that the company was abandoning the design and returning to the production of traditional copper-tube aluminum-fin coils. This bothered me, and it prompted me to write "The Death of the Aluminum Coil," my second-ever magazine article (which appeared in The ACHR News that year), which was published in The ACHR News.

    A few months later, at a Carrier Corp. winter meeting, I ran into the then-president, who inquired as to what I had in mind when I decided to write an article of this nature. As a result, I explained to him:If you join metals that are dissimilar to one another (for example, copper and aluminum), you will experience electrolysis, which will result in a constantly deteriorating bond and decreased system efficiency. Then he explained that they had to make such a change in order to remain competitive in the market because the price of aluminum had risen significantly more than the price of copper at the time.

    "Why don't we do that?" the then-president inquired of his head of engineering, who happened to be standing directly behind him at the time."Because our conveyor belts couldn't handle the additional load," the head of engineering responded. This multi port tube-channel condensing unit is manufactured by AllStyle Coil Co. and is marketed under the brand names Weil-McLain and Williamson, among other names. For the reasons stated above, I have remained a staunch supporter of single-metal condenser and evaporator coils throughout the years. Therefore, when I saw my first all-aluminum micro-channel condenser coils at the AHR Expo York booth the previous year, I was extremely excited. And I'm beginning to believe that they are the wave of the future as well. What is the reason?

    The fact that micro-channel coils can be significantly smaller than conventional coils, in addition to the fact that they will retain their efficiency for a longer period of time, allows for the development of high-efficiency designs. Because of recent legislation requiring minimum air conditioning efficiency of 13 SEER, most standard copper-tube aluminum-fin units have grown significantly in size, which many customers find objectionable to. Consequently, other than using -channel designs, the only other option is to make the coils deeper, which makes them more difficult to clean.

    Another advantage of aluminium micro channel tube-channel coils is that all of the exterior aluminum parts are zinc coated, which increases their reliability even further. Additionally, because zinc is a natural anti-microbial, micro channel tube-channel evaporator coils will be less prone to the growth of molds and bacteria than conventional coils. The zinc coating, on the other hand, was not intended for this purpose, but rather to allow the aluminum parts to be assembled and soldered together. What I believe will be the tipping point, which will eventually lead to widespread industry adoption of this design, is the fact that these coils are simpler and less expensive to manufacture than previous designs.

    8 x 2 mm 6061 T6 Al  aluminium tube8 x 2 mm 6061 T6 Al  aluminium

    Aluminum Multi Port TubeAluminum Multi Port

    But what if aluminum prices begin to rise at a faster rate than copper prices? I'd like to reiterate my recommendation to use only copper coils. Or would that be too much of a burden on the factory's conveyor belts and equipment? I just want to point out that a dear friend of mine does not agree with my assessment of the success of -channel coils in the industry. He is concerned that the extreme narrowness of the refrigerant channels will cause circulated lubricants to solidify, particularly in heat pumps in far-northern locations, but he believes that time will tell whether this is the case.