Modelling - review, gap analysis and categorization

Subtask 3: Modelling - review, gap analysis and categorization

In the past, many models have been developed in the field of building performance simulation (e.g. building design, life cycle analysis and energy retrofit). However, existing knowledge is still inadequate for predicting the combined effects of hygrothermal conditions and chemical reactions on the indoor pollution species and concentrations. In light of most recent revelation of the importance of secondary emissions such as Ozone-initiated indoor air and surface chemistry, a modelling approach of the effects of combined heat, air, moisture and pollutant (CHAMPS) transport and their impact on energy and IAQ (indoor air quality) is needed.

Definition and Objectives
The main point is not to further develop tools, but to include all and develop classification methodology – a reference system.
This means the collaborative model development towards a fully coupled CHAMPS modeling platform can be realized: "The target of Subtask 3 is a review, gap analysis and categorization of existing models and standards. The task is to collect and develop validated reference cases by use of contemporary whole building analysis tools and methods to predict the hygrothermal conditions, absorption and transport of humidity and chemical substances, and energy consumption within buildings."

A collaborative model development towards a fully coupled CHAMPS modeling platform. This platform is an open-source repository for numerical solvers and data being able to capture the most important physical processes of coupled heat, air, moisture and pollutant transfer in buildings.

Developing BIM-HVAC tool, which is an integrated modeling environment has capabilities to import BIM models and to trigger energy, airflow and daylight simulations

Recent activity and future steps

  1. Work on the description of a common exercise with the Passys Cell. The link with information on the Passys Cell project was distributed by JG during Dresden meeting. CHAMPS-Multizone has been applied for simulation of temperature, air pressure, moisture and VOC in the Passys room and in the walls and a first reference solution shall be discussed in Nottingham.
  2. The ST3 common exercise aims at model to model comparison. A very simple processes shall be developed and the complexity shall be increased step by step. The effects of different modeling assumptions shall be observed, however some effects cannot be captured by some models at all. The target of this exercise is the development of a set of reference solutions which are considered being "correct enough" for automated quality control.
  3. AN will attend Nottingham meeting as well. He is focused on development of co-simulation technologies. Here are the title and description of his presentation:Title: "Whole building heat, air, moisture and pollutant simulation:Technologies for Co-Simulation between simulation models DELPHIN(emission), Modelica (ventilation system + control) and THERAKLES (room model)"

See the list of participants


Contact person:,


John Grunewald
Technical University Dresden
+49 (0)351 463-35259
26 OCTOBER 2021