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
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.
Multi-Room Dynamic Daylighting Visualization
Multiple rooms showing Dynamic Daylighting results can now be visualized at the same time
RadianceIES collate all rooms with same outputs for selection and visualization, saving you time
Improved labelling of windows and window groups for the VSC calculation or sDA calculations now available
Got a question?
Our team is happy to answer any questions you have about the new features in IESVE 2021.