IESVE 2021

IESVE 2021 extends energy code compliance offerings and strengthens tools to aid the drive for decarbonization

IESVE 2021 Updates

Florida Building Code 7th edition 2020

As part of IES’ ongoing commitment to providing energy code-compliance solutions in North America, IESVE Software is now certified by the Florida Building Commission for the 2020 Florida Energy Code.

  • Certified by the Florida Building Commission. 
  • Compliance achieved through the ASHRAE 90.1-2016 Navigator.
  • Florida-specific budget building is automatically created, per FBC requirements. 
  • Florida specific compliance reports are generated.
  • IES training courses certified for continued education (CEU/PDH’s) by Florida Board of Professional Engineers.

ASHRAE 90.1-2016

A number of new productivity features have been added to the latest 2016 version of the ASHRAE 90.1 Navigators:

  • Proposed building can be automatically pre-populated in two ways:
    • Prescriptive – using 90.1 standard data or
    • Performance – using Appendix G baseline
  • Constructions can now be applied automatically based simply on the choice of building type and climate zone
  • New calculation methodologies for the following energy end uses
    • Elevators / escalators
    • Refrigeration
  • New end uses enhanced to include
    • Interior lighting (unregulated) / Transformers / Motors 
  • Unregulated energy use types expanded to include
    • Lighting / Process / Receptacle / Cooking
  • New approaches to controls
    • Lighting – new baseline control (based on fraction 90% only)
    • Receptacles – user choice (manual / automated)





ASHRAE 55 2013 & 2017

New methods and a new flexible approach to setting up and analysing thermal comfort

  • Room level comfort settings accounting for occupant’s response to their perceived comfort
  • 18 new room variables in VistaPro provides more insight into occupant discomfort and make decisions to enhance comfort with low energy use
  • Three methods can be used for adaptive comfort:    
    • Software automates how occupants would adapt to find their optimum comfort level
    • Users can set adaption limits based on modulating occupancy profiles
    • Users can set adaption values based on absolute or formulae based occupancy profiles
  • Elevated air speed –fan cooling effect (& associated energy usage) can be assessed room by room
  • The impact of direct solar radiation  on the occupant is now accounted for in the comfort assessment:
    • Accounts for the posture of the occupants within the room
    • Accounts for mitigation effects such as the control of blinds/louvres 

Air to Air Heat Pumps

  • Enhanced heat pump method that includes the following updates:
    • Capacity and compressor power vary by:
      • Wet-bulb and Dry-bulb temperatures
      • Part-Load Ratio
    • EIR for fan on outdoor coil (heat rejection/acquisition)
    • Back-up heat source with multiple control schemes
    • Crankcase heater for compressors
    • Defrost: resistive or reverse-cycle; timed or demand control
  • Interrelated efficiency parameters are now calculated and displayed by the software 
  • COP, EERnf (EER with no fan), & IEER per entered EER value
  • Performance curves as required by the California Title 24 ACM Manual DX Cooling and HP Heating sections
    • Available for use outside of California Title 24 

Free Convection: Cooling Towers/Fluid Coolers

  • Free convection can now be assessed for both Cooling Towers and Fluid Coolers, allowing for associated reductions in electrical energy.
  • Controlling parameter is the ‘Free convection airflow fraction’, based upon the assumption that a moderate initial fraction (e.g., 10%) of cooling-tower or fluid-cooler airflow will be driven by thermal stack effect. 
  • Fluid Cooler – new control option:
    • Applicable only to Wet/Dry Fluid Coolers
  • Two options available:
    • Maximise dry operation (dry whenever it can meet the load)
    • Maximise wet operation (always wet at or above set temperature)

Fan Control Updates

  • Added capability for zone-level recirculation fans to operate only when associated compressor operates (as in heat pumps, zone-level AC, etc.) via new “Cycle on with terminal unit compressor” control option in the system parameters UI. 
  • For AAHP, WAHP, and DX Cooling, a new “Single compressor with fixed speed/output” checkbox determines if the compressor is modeled (via curve data) as cycling on/off below 100% load, or as cycling on/off only below min PLR setting (via simulation run-time fraction). This also influences the fan cycling, when that is linked to the compressor operation.

Daylighting Enhancements

  • Multi-Room Dynamic Daylighting Visualization 
    • Multiple rooms showing Dynamic Daylighting results can now be visualized at the same time
    • RadianceIES collates all rooms with same outputs for selection and visualization, saving you time
  • Window Labelling
    • Improved labelling of windows and window groups for VSC and sDA calculations now available

Release Notes

For further supporting information please take a look at the IESVE 2021 release notes. 

Got a question?

Our team is happy to answer any questions you have about the new features in IESVE 2021.