6-30 Ton Hitachi SmartFlex™ VRF

Rated highest for energy efficiency

Hitachi SmartFlex™ VRF systems rank impressively high in the ratings that matter most for VRF technology

Hitachi SmartFlex VRF systems rank impressively high in the ratings that matter most for VRF technology: simultaneous cooling and heating efficiency (SCHE) and integrated energy efficiency ratio (IEER). The traditional measure of HVAC equipment, energy efficiency ratio (EER), measures system efficiency at full load. Using EER ratings may be appropriate for equipment that operates in a traditional cycle (fully on or fully off), but it is not appropriate for properly sized VRF systems, Since VRF systems have the ability to spend the vast majority of time at part load, reaching full load only on the hottest or coldest days. Hitachi SmartFlex VRF systems thereby excel against truer measures of efficiency and the following should be considered when evaluating solution choices:

  • SCHE applies to VRF systems with energy recovery features. It is defined as the ratio of a system’s total capacity (heating and cooling) to the effective power consumption. Hitachi SmartFlex VRF systems carry SCHE ratings as high as 29.5.
  • IEER expresses cooling efficiency based on weighted operation at various part-load conditions. Hitachi SmartFlex VRF systems carry IEER ratings as high as 25.2.
  • The Coefficient of Performance (COP) ratio expresses the efficiency of a heat pump while in heating mode. COP rating according to AHRI is calculated at two different ambient temperatures, 47°F and 17°F. Hitachi SmartFlex has COP 47°F and COP 17°F values up to 4.21 and 2.78, respectively.

Exclusive Hitachi high efficiency DC inverter scroll compressor

The core technology of Hitachi SmartFlex VRF systems is the exclusive Hitachi-designed high efficiency DC inverter and scroll compressor. The compressor is engineered to maximize efficiency at partial loads – the state in which building HVAC systems operate the vast majority of the time. Its advantages include a high compression ratio, excellent reliability, and quiet operation.

Key benefits:

  • Compressor speed modulates to match the thermal load, enhancing efficiency.
  • Longer run time at reduced capacity improves humidity control in cooling.
  • Fewer start-stop cycles mean longer compressor motor life
  • Soft-start technology nearly eliminates inrush current, saving energy.

The Changeover Box (COB) is smartly engineered to be the workhorse in a heat recovery system

Built-in simplicity. The changeover box redirects refrigerant vapor to the desired zone. Because the Hitachi design switches vapor instead of liquid, no condensate is produced and fewer valves are required as compared to traditional changeover boxes. Each changeover box has only four electronically controlled valves, and a fully insulated valve housing to minimize noise. These valves are protected with a fine mesh strainer to increase reliability by eliminating any debris that may be introduced into the refrigerant circuit.

Quieter operation. Low-noise valve operation means there is no need to place the changeover box in a remote location. Each box has only four valves, all fully insulated to minimize noise and condensation.

Reliable performance. The changeover box continually operates even if one indoor unit on a circuit malfunctions. The valves work according to the demand of each zone. For added reliability, valves are protected with strainers to ensure that the vapor lines function without issue. A simplified design positions the valves for easy service access.