Defining the metrics

Definition
The lack of an index (or a marker or a metric), which quantitatively describes the IAQ and allows its evaluation against the indices describing energy use, can be regarded as one of the major obstacles for achieving the further and closer integration of energy and IAQ strategies in building design and optimization. Such an index/metric would allow examination of different strategies for achieving high IAQ in relation to their energy performance and greenhouse gas emissions.

One important complication of developing such index is that hundreds of chemical and biological pollutants are found in indoor air, including residential environments, and there is no consensus on which compound could serve the purpose of such index, or how to integrate these compounds into one index or how such an index could be developed based on the available information on the effects of pollutants on humans; for many of pollutants such information is still lacking.

The goal of Subtask 1 is setting up the metrics to assess the performance of low-energy buildings as regards indoor air quality combining the aspirations to achieve very high energy performance without compromising indoor environmental quality

Subtask 1 consists of the subsequent steps:

  • Collection of data on indoor air pollution in residential buildings with a particular focus on low-energy buildings to provide an overview of the exposure of occupants to contaminants in residential buildings and to identify differences, if any, between low-energy buildings and the buildings that cannot be termed as low-energy (representative of the current building stock).
  • Compilation of the pollutant Exposure Limit Values relevant for the current project.
  • Identification of target pollutants relative to indoor air quality.
  • Surveying IAQ indices developed previously.
  • Defining the metric(s) that can be used to achieve the objectives of Annex 68 project considering the aspect of energy consumption.

Deliverables
The report has been written. A graphical representation has been proposed to facilitate the visual and quantitative comparison among a reference IAQ/Energy situation and possible air cleaning solutions. ST1 report is planned to be published as AIVC Contributed Report in October 2017.

Recent activity and future steps
Subtask 1 was a 1 year task and is currently in dormant state.

Published articles
Louis Cony Renaud Salis, Marc Abadie, Pawel Wargocki, Carsten Rode, Towards the definition of indicators for assessment of indoor air quality and energy performance in low-energy residential buildings, Energy and Buildings, Volume 152, 2017, Pages 492-502, ISSN 0378-7788, http://dx.doi.org/10.1016/j.enbuild.2017.07.054



Contact

   Marc Abadie
   Associate Professor
   University of La Rochelle
   +33 (0)5 16 49 67 54
   mabadie@univ-lr.fr
http://www.iea-ebc-annex68.org/subtasks/defining-the-metrics
15 DECEMBER 2018