Hitting Net-Zero with HVAC Modelling

Improve HVAC Performance at every stage of the building life cycle

Cities around the world are implementing zero-carbon targets with many looking at the 2040s. Clients also are turning their attention to buildings achieving net zero carbon status more than ever. Attaining these lower targets requires the feedback that can only be provided by building simulation and tracking energy and carbon performance across the entire building life cycle.

IES’ ApacheHVAC modelling and analysis allows a highly accurate virtual representation of buildings and their systems on a sub-hourly basis. Our high quality modelling improves design decisions, operational efficiency, HVAC system capacity and control. We work to map meters in the model so they align with your planned metering strategy. This approach ensures a direct comparison of modelled and metered data in real life so you can measure and achieve your goals at the outset.

IES Consulting are perfectly placed to take your model to the next level in HVAC performance. We can represent and then refine your design by reporting on plant sizing, load matching and overall energy/carbon performance. We can provide schematic and 3D visual representations of HVAC system’s performance which provides clear communication on the opportunities and risks associated with your building. Through this approach you can be confident in unlocking the true low energy potential of the systems you are planning.

Loads vs HVAC 

Better feedback from your building with HVAC modelling

Loads sizing provides limited results and confusion on how to meet net-zero targets.  Consider HVAC modelling for greater insights and accurate building predictions. 

Check out the video to find out more.

Progression of HVAC through RIBA 2020 stages

The HVAC model should be considered from Concept through to the Use RIBA stages. Make crucial design decisions, identify and assess trade-offs, meet zero-carbon targets and close the performance gap.



Stage 2 - Concept Design

  • Simple systems analysis
  • Establish how design options impact heating and cooling demand
  • Consider site opportunities for LZC/NZC design
  • Consider System types and energy source selection
  • Start an early stage HVAC model – particularly if considering Heat Pumps
  • Auto-sized system capacities
Riba stage 2 concept design model

Riba stage 3 hvac



Stage 3/4 - Detailed Design

  • Identify key energy demands and explore options to reduce these
  • Identify and assess the trade-offs different design solutions offer
  • Compare the Performance of Alternative Systems
  • Develop complete HVAC model of the System Design
  • Assess Occupancy Comfort
  • Implement operational control strategies
  • Ensure Systems meet the design criteria
  • Plant design and selection including design capacities
  • Future climate impact



Stage 5 - Manufacturing & Construction

  • Update HVAC model to reflect the installed plant efficiencies and capacities
  • Ensure Systems meet the design criteria



Stage 6/7 - Handover & In Use

  • Compare measured performance data to simulated performance to ensure the Building is operating as intended
  • Incorporate virtual energy sub-meters that reflect the metering configuration of the real building
  • Develop a Digital Twin of the Operational Building
measured v modelled data

Finding detailed HVAC modelling tricky? Help is at hand! 

If you are looking to develop your skills or your project incorporates challenging design features then enlist the help of IES Consulting. As the expert users in applying the Virtual Environment we are best placed to share our knowledge and expertise for the benefit of your project. We offer tailored project mentoring to guide you step by step towards achieving your needs, ensuring confidence in the accuracy and delivery of the project.


Got a question?

Contact IES Consulting to find out how we can help you with your projects.