- Update to Scotland Section 63 to align with iSBEM_v6.1.e
o updates the lighting energy calculation for Scotland's Section 63 Action Plan. - VE plug-in for SketchUp has been updated to be compatible with SketchUp 2024 and install automatically when VE 2024 is installed.
IESVE 2024
IESVE 2024 provides increased flexibility to users and continues to aid the drive for decarbonization and electrification.
Parametric Simulation
The Parametric Simulation feature in IESVE Software empowers users to compare a large range of design possibilities, be it for a single-variant design study or a multi-parameter whole-building design perspective. The Parametric Simulation feature has access to a large number of model variables and is integrated into the full range of APACHE’s links (Solar, Daylight, Airflow, Loads/Sizing and HVAC Systems). Over a thousand permutations are possible with one model.
- Easy to use Parametric Simulation setup
- Auto-sequencing of actions: solar/daylight/loads/sizing/simulation/reports
- Many Design Parameters Available
- Weather Files for Resilient future scenarios
- Geometry: shading, orientation, % glazing WWR
- Renewables: Solar PV, Wind
- Envelope: Glazing, Walls, Roof, Operable Controls, Infiltration
- Internal Gains: Lighting Power Density, Daylight Controls
- HVAC: Heating/Cooling Setpoints, HVAC System Types
- Results Analyses
- Parallel Coordinate Charts
- Stacked Bar Charts
- Exports to CSV files
- ‘Promote’ a select Permutation back to the live model
- Share or reuse exportable parametric studies
- Simulation Resolution optimizes for speed and disk space
- Traditional 365-day simulation (8,760 hours)
- 1 Week per Month – 4x speed up
- 1 Week per Season – 13x speed up
Learn more about Parametric Simulation here.
Watch our on-demand webinar here.
Manufacturer Components

- Additional new products have been added to the existing Passivent Roof Terminals Navigator and component library
- The VE now supports Airscoop® Roof Terminal units (with and without low-level inlets) and Passivent’s Airstract®, Passivent Airstract® iAT, Passivent Hybrid Plus Airstract®, Passivent Litevent Airstract® units (all with low-level inlets)
- Boosted products involve buddy HVAC networks.
- New APX products which are more efficient, have been added to the existing Monodraught HVR Hybrid Navigator component library
Central Plant Heat Pumps coupling to Heat Transfer Loop as water source and/or sink
The Central Plant Heat Pump (CPHP), can now use a Heat Transfer Loop (HTL) as a heat source or sink, when it’s configured in water-to-water mode.
When configured correctly, the permutations for these systems are vast, and will allow the simulation of a multitude of modern decarbonisation strategies, designed to maximise the recycling of heat within a building, before needing to acquire or reject it to an external energy reservoir.
This provides significant new capability and opportunities for modelling of heat-recovery between different hydronic loops serving coincident heating & cooling loads.
It also enhances the ability to model geo-exchange systems more explicitly for either Ground-Water Geothermal (e.g., Darcy systems) or Underground Thermal Energy Networks.
This update similarly enhances the fidelity of HVAC models where the coupling of condenser heat recovery sources, combined heat & power, solar water heaters, and cooling towers or fluid coolers is included in the design.
- Central Plant Heat Pumps (CPHPs) serving a Hot Water Loop can be coupled to a Heat Transfer Loop (HTL) so that heat rejected to the HTL can be accessed by other equipment on that loop, including:
- Water-to-Air Heat Pumps (WAHPs)
- Water-Source VRF systems
- Water cooled data centre air-conditioning systems
- CPHPs can now indirectly access space heating and DHW through the HTL
- CPHPs gain access to an explicit water-source heat exchanger model for heat acquisition/rejection.
- Any “pre-heating” of the HTL (e.g., via water-source HX, solar water heater, condenser heat recovery, etc.) is also available as a heat source for upgrade via CPHPs.
- CPHPs serving a Chilled Water Loop can reject heat to the HTL, making that heat available for use by WAHPs and/or water-source VRF systems.
- Coupling to cooling tower or fluid cooler for rejection of excess heat via the HTL allows CPHPs in cooling mode to run as water-cooled chillers.
Detailed CIBSE Loads Reports now available in Apache View and VistaPro

- Detailed CIBSE Loads Analysis Reports are now easy to generate outside of the HVAC Wizard, including an excel version
- A new button in VistaPro produces a summary of the Loads reports (for both CIBSE and ASHRAE) in tabular form, from directly within VistaPro
Evaporative Cooling Spray Chamber

- The enhanced spray chamber/wetted media component provides three distinct means of modelling an evaporative cooler:
- Saturation Efficiency – Fixed value or Modulated value (Profile)
- Pad Area and Face Velocity – Lookup Table of user-editable values
- Performance Curve – selection of a pre-defined curve with visualisation
Chiller Curves

Chiller Curves Sorting
- The chiller performance curve library is now sortable by Capacity, IPLV, Rated COP, curve set Name, and Source.
- A dropdown selector and sort-order button, determine the sort criteria and ascending or descending order.
Generic chiller curves for a range of integrated part-load (IPLV) values
- Four generic curve sets for EWC chillers are provided within the Performance Curves library.
- Four generic curve sets for EAC chillers are available in the "Performance curve set" drop-down within the Electric Air-Cooled Chiller edit dialog
- Each curve set covers a particular range of Integrated Part-Load Values (IPLVs).
ASHRAE 90.1 2016 / 2019 - Energy Cost Budget
The Energy Cost Budget method (ECB) has now been included in the 90.1 2016 and 2019 navigators alongside the Performance Rating Method (PRM), providing users with the option to submit with either method. The same workflow is used as per previous navigator versions, with updates catering to both 2016 and 2019.
The navigators now include:
- More appropriate default proposed constructions assignments
- Climate Zone filtering for constructions
- New ECB HVAC libraries
- New ECB reporting
- Budget model rotation
- 2019 only – Lighting updates for the budget minimum skylight area calculation and Lighting Power Density (LPD) changes
- 2019 only - Budget building refrigeration updates
Free Web Demo: September 24th, 2pm CDT - Register Here
ASHRAE Standard 140 2020

Keeps IES up to date with ASHRAE 140 for compliance.
Translucent Shade - Profile

The option to apply a profile to vary transmission through a translucent shade, lets you emulate detailed variations for dynamic shading performance. This enables an accurate representation of translucent surfaces, such as brise soleil, mesh or lattice shading with a single transparent surface, drastically reducing computation and modelling times
Four modelling methods are available:
- Construction – Fixed transmission values are brought through from the construction and accessed as per VE 2019
- Annual - A single transmission value is used for every month to emulate seasonal changes. This is used instead of the simple construction transmission value
- Monthly - The transmission values vary on a month-by-month basis. As above This is used instead of the construction transmission value
- Profile Control (i.e. Hourly) - The transmission value can vary on an hour by hour basis, as it is determined by the selected Modulating profile. The angular dependence in this case is always constant
The properties can be set for individual shades, or set globally.
ASHRAE Standard 140 2020

Keeps IES up to date with ASHRAE 140 for compliance.
Miscellaneous
IESVE 2024
Miscellaneous

- JPA Designer SAP v10 is accessible via the VE Compliance (UK & Ireland) > UK Dwellings
- A New “Refresh the model” button is included within the Model Viewer II general toolbar to display objects ticked within the Model Browser.
- Smoother model transition views (North, South, East, West ) within Model Viewer II
- Optimisation of the GDI renderer has taken place improving timings of the below actions within the Construction database (CDB):
- Opening CDB
- Switching between construction categories
- Assigned CDB constructions
- Closing CDB
New Login for IESVE
IESVE 2024
Upon opening IESVE 2024, users will now be directed to ‘sign up now’ and create an account. This new addition enables users to easily see their licence information and expiry date, keeping everything easily accessible and in one place. Registration on this new system is only required once, then sign in will become the same login used for iesve.com.