Most conventional fixed-speed compressors systems only operate at 0% and 100%; in other words, fixed-speed compressors are either off or on. This method wastes energy when partial-load conditions exist. Even a multi-speed system or a system with 2 or 3 stages doesn't compare to the full-range variable capacity of the inverter-driven ductless system that fully supports part-load operation.
In comparison, INVERTER compressors start slow (do not have starting load spike) then ramp up quickly, providing the energy necessary to achieve the cooling or heating demand. Then, working in tandem with system controls and sensors, the INVERTER compressor varies its speed to maintain the desired comfort level. Thus, the ductless mini split system performs at only the minimal energy levels and does not waste electricity when partial-load conditions exist, which is 97% of the time in most locations.
The industry recognized part-load operation systems now being rated with a new procedure yielding an Integrated Energy Efficiency Ration (IEER) rating. This is a great improvement over the IPLV (Integrated Part Load Value) method. To obtain IEER ratings, the systems are tested at four different capacity levels and outdoor temperature conditions to provide a very accurate part-load measure. IEER will be the gold standard for part-load systems in the near future, and Mitsubishi ductless mini-split systems, built with the INVERTER technology, are designed to be among the best.
Mitsubishi commercial VRFZ and smaller mini-split systems also save energy through zoning capabilities. INVERTER-driven VRFZ systems can be sized and designed to regulate performance for a building's solar gain and the changing winds. Certain VRFZ systems have the ability to simultaneously operate in cooling and heating-using the building's own environment to save energy. These systems, also called heat recovery systems, use branch circuit controllers to control refrigerant flow, thus removing energy from one zone that doesn't need it, and apply it to a different zone that does. The branch controller performs all the work, bypassing the compressor and saving electricity.
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