The new Decree 9/2023 (25 May) on the definition of the energy performance of buildings also includes a definition of dynamic simulation: 'a computer modelling procedure for modelling the time-varying behaviour of a building and its technical building system, which is able to take into account dynamically changing external and internal (demand-side) effects'. In the formulation, dynamic effects are time-varying effects that can only be taken into account in simple calculations by means of average values, which may differ significantly from the actual values. Examples of such external dynamic effects are the weather, while internal effects are user behaviour.
The latest tool for building energy calculations is therefore dynamic simulation, which can analyse the consumption of building systems at hourly or even more detailed temporal resolutions than traditional seasonal or monthly calculation methods - taking dynamic effects into account more accurately.
This can be done with real weather data and accurate user behaviour.
In addition, simulation can be used to visualise consumption data broken down into individual system components, and to analyse, for example, humidification, comfort parameters or solar energy production.
By providing data on building use and operation, the interaction of different building systems can also be analysed, for example, to visualise changes in cooling and lighting energy consumption, which are highly dependent on shading.
Simulation analysis can also be useful in the design phase of a building, for example to optimise the geometry of the building and the most efficient mechanical design concept. It can also be used for energy audits and is already required by some tenders, and dynamic simulation is a mandatory element of the international LEED certification for sustainability.
Our company performs dynamic simulation calculations with one of the most widely used software in international practice, DesignBuilder with EnergyPlus engine.The software is capable of calculating energy consumption, heat load and heat demand, humidification, air quality, life cycle cost analysis and emissions data.This gives the most accurate picture possible of how a building will operate.