Energy Efficient HVAC Design

Energy modeling software has been used to compare INVERTER-driven VRF split-systems with other types of systems, applying the design conditions for several major U.S. cities. The outcome? VRF systems were consistently 25% or more efficient than traditional systems.

Most fixed-speed compressors in traditional HVAC systems only operate at 0% and 100%; in other words, fixed-speed compressors are either off or on, wasting energy when partial-load conditions prevail. And even if you have a traditional system with 2 or 3 stages, it doesn't compare to the full-range variable capacity of the inverter-driven system that fully supports part-load operation.

In comparison, INVERTER compressors ramp up quickly, providing the energy necessary to achieve the cooling or heating demand of the zone. Then, working in tandem with system controls and sensors, the INVERTER compressor varies its speed to maintain the desired comfort level. Thus, the system performs at only the minimum energy levels necessary and does not waste electricity when partial-load conditions are present, which is 97% of the time in most locations.

The industry is beginning to recognize part-load operations-part-load systems are 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 Electric Cooling & Heating VRF systems, with the INVERTER technology, are designed to be among the best.

Mitsubishi Electric Cooling & Heating VRF and smaller split systems also save energy through zoning capabilities; INVERTER-driven VRF systems can be sized and designed to adjust for a building's solar gain and the changing seasons. And certain VRF 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 a branch circuit (BC) controller to control energy. The BC controller can remove energy from one zone that doesn't need it, and apply it to a different zone that does. The BC controller performs all the work, bypassing the compressor unit and saving electricity. Click on the "Zoned Comfort" link for more information.

Energy Efficient HVAC Design

Energy modeling software has been used to compare INVERTER-driven VRF split-systems with other types of systems, applying the design conditions for several major U.S. cities. The outcome? VRF systems were consistently 25% or more efficient than traditional systems.

Most fixed-speed compressors in traditional HVAC systems only operate at 0% and 100%; in other words, fixed-speed compressors are either off or on, wasting energy when partial-load conditions prevail. And even if you have a traditional system with 2 or 3 stages, it doesn't compare to the full-range variable capacity of the inverter-driven system that fully supports part-load operation.

In comparison, INVERTER compressors ramp up quickly, providing the energy necessary to achieve the cooling or heating demand of the zone. Then, working in tandem with system controls and sensors, the INVERTER compressor varies its speed to maintain the desired comfort level. Thus, the system performs at only the minimum energy levels necessary and does not waste electricity when partial-load conditions are present, which is 97% of the time in most locations.

The industry is beginning to recognize part-load operations-part-load systems are 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 Electric Cooling & Heating VRF systems, with the INVERTER technology, are designed to be among the best.

Mitsubishi Electric Cooling & Heating VRF and smaller split systems also save energy through zoning capabilities; INVERTER-driven VRF systems can be sized and designed to adjust for a building's solar gain and the changing seasons. And certain VRF 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 a branch circuit (BC) controller to control energy. The BC controller can remove energy from one zone that doesn't need it, and apply it to a different zone that does. The BC controller performs all the work, bypassing the compressor unit and saving electricity. Click on the "Zoned Comfort" link for more information.

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