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Revolution - Active Desiccant - Vapor Compression Hybrid Rooftop Unit

  • Simple and Effective Compliance with ASHRAE 62 and 90.1 Standards and Major Building Codes
    • Revolution handles the increased outdoor air percentages and space humidity requirements recommended by ASHRAE Standard 62 and required by all major building codes. It provides unprecedented dehumidification capacity and allows for the incorporation of effective total energy recovery as required by ASHRAE Standard 90.1.
  • Reduced Energy Costs
    • By using variable supply air volume (VAV), variable speed compressors, modulating gas valves and DDC logistics, the Revolution operates efficiently while accommodating essentially any design condition. Research has shown that by effectively controlling space humidity, occupants will reach comfort at higher space thermostat settings. Figure 1 summarizes DOE 2.1 modeling that correlates reduced thermostat settings with the corresponding increase in energy costs for a typical restaurant facility.
  • Complete HVAC Solution
    • Revolution can be applied as a dedicated outdoor air system (DOAS) - to manage all of the outdoor ventilation requirements by delivering low dew point air to satisfy the entire outdoor and space latent loads. Revolution can also be applied as a total conditioning system (TCS) - to handle all of the building HVAC requirements, and can function as a true VAV system.
  • Enhanced Comfort Control and Indoor Air Quality
    • Revolution delivers precise, independent temperature and humidity supply air with continuous outdoor air fractions as high as 100%. For the first time, designers can match the sensible and latent performance of the rooftop unit to the actual space load conditions, providing efficient temperature and humidity control.
      Figure 2 shows results from a DOE pilot project comparing the space humidity conditions in a restaurant facility before and after a Revolution retrofit.
  • Avoids Expensive "Over-Cool and Reheat"
    • Revolution mixes the "bone dry" air leaving the active desiccant wheel with bypass air leaving the cooling coil, so low dew point conditions are provided at the desired temperature. This eliminates the need for the otherwise extremely cold coil leaving air temperatures (low suction pressures and lower operating efficiency) and costly reheat, prohibited in most cases by the ASHRAE 90.1 energy standard.
  • Addresses Microbial Concerns (mold and mildew)
    • By providing effective control of space humidity at all conditions, the risk of mold growth within the space, ceiling tiles and carpeting, which is often linked to the HVAC system, is eliminated. Revolution delivers air to the space that is seldom saturated, which often greatly reduces the risk of microbial growth within the ductwork.
  • Enhanced Cooling Capacity Output
    • Revolution uses fewer tons of mechanical cooling capacity to deliver a desired supply air dew point. In fact, up to 70% less than conventional systems, when integrating SEMCO's FV total enthalpy recovery module. This is accomplished by processing much of the latent load with the active desiccant wheel and employing a high efficiency refrigeration cycle. Figure 3 reflects typical cooling capacity reductions possible for facilities designed and operated in accordance with ASHRAE Standards 62 and 90.1.
  • Technology Comparison of DOAS Approaches
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