Most of the mini-split manufacturers have, by design, created the most compact, quiet, and efficient air conditioning condensing units in the market. The reasons are simple: Most of the world’s average energy costs are three to five times the U.S. average cost.
Coupled with the fact that space in large cities is hard to come by, the small, quiet units have simple necessity on their side.
New and improvedThese units are surprisingly reliable. This, too, is designed into the units, because many of these outdoor units are placed on a wall many stories higher than the longest ladder.
Size and noise design considerations, though, are hardly new. Introduced to the U.S. market not 20 years ago, mini-split technology has not stopped advancing.
A few years back, many manufacturers started to put the metering device in the condensing unit housing. This boosted efficiency and maintained performance.
Although this design also eliminated the need for more than 50% of the standard refrigerant charge in the system, it is not without constraints.
Typically, line set length and elevation differences are shortened. For the rest of the world, this has not posed any difficulty because most of the time, the indoor and outdoor units are close together.
Instead of locating the outdoor unit on a four-story roof for a first-floor installation, the quiet outdoor unit is conveniently hung on the outside wall, near the indoor unit.
Heat exchangers have also continued to improve. Mini-splits have applied larger-than-typical heat exchangers for years. Not only does that equate to improved efficiency, but also to quiet operation.
Samsung specificsSamsung employs several features that further enhance its heat exchangers.
All of its lanced fin-and-tube coils have rifled interior tube walls. When matched with the dense fin arrangement, the ambient air quickly changes temperature.
The indoor coil with this design extracts moisture quite efficiently, allowing the consumer to adjust the temperature setting at a higher level while enjoying the comfort of drier air.
Another innovation incorporated into these heat exchangers is in the fin coating. These coatings are actually films that adhere to the flat surface of the aluminum sheeting. Although they add considerable life to the heat exchanger, the purpose of the film is to aid in heat transfer.
The blue-tinged outside film reacts to moisture in the air. This transudation allows improved heat transfer.
The indoor heat exchanger film also includes an antibacterial formula that prevents fungi, molds, and bacteria from adhering to the coil. This feature helps keep the coil cleaner and minimizes odors.
Additional improvements have been made in the construction:
As I said before, the hvac industry constantly requires product innovations. So, even though the unit improvements listed here will take us into the 21st century, expect still more enhancements in years to come.