Carrier Transicold’s X2 series trailer refrigeration units are now among the quietest on the market, the company says, thanks to the coupling of the new V-Force fan with the new Stealth 2 option.

Said to be seven decibels quieter than the traditional condenser fan it replaces, the V-Force fan is now a standard feature on all X2 series units. It’s engineered with vortex-suppression tips that virtually eliminate spinning pockets of recirculating air that result in inefficiency and noise. In addition, the new fan minimizes pulsations through fan drive-system components that can result in additional noise and component wear, Carrier says.

For system cooling, particularly in high-ambient operations, the V-Force fan is said to deliver 8% more air flow to the radiator and condenser than a conventional condenser fan. A cooler condenser also helps keep down compressor head pressures, reducing the power needed to operate the compressor for both better fuel economy and longer compressor life. With half the weight of the old-style fan, the V-Force fan puts less stress on the fan shaft, bearings, seals and other drive components.

For customers with particularly noise-sensitive applications such as urban delivery, the Stealth 2 noise-abatement option offers additional sound reduction. It takes technology from Carrier’s original Stealth package and adds a tuned intake system to the diesel engine, further enhancing noise suppression and sound quality.

The tuned intake system uses a high-capacity noise-suppressing air cleaner and a Helmholtz resonator, an acoustically engineered chamber that captures and dissipates targeted sound waves before they propagate away from the refrigeration unit. The tuned intake system achieves a 30-decibel sound reduction for certain frequencies.

The tuned intake system targets low-frequency rumbling noises that travel longer distances, wavelengths that cause concerns with neighbors in residential areas near distribution centers or when drivers make urban deliveries.