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A simple airlfow path approach to sizing natural ventilation systems in a code context

Jelle Laverge (UGent) and Arnold Janssens (UGent)
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Abstract
Most of the existing ventilation standards are drafted in a rather prescriptive way. Growing focus on the implementation of rational energy use however, introduces an urgent need for more performance-based criteria. Optimization of energy consumption obviously encompasses minimization of ventilation airflow rates. Comfort, on the other hand, should not be reduced because of these actions. To implement this in a legal figure, one can appeal to the principle of equivalence. This principle states that all systems achieving equivalent performance to that of the systems described in the standard are acceptable. Better yet, a new standard can be devised, imposing a reference performance rather than a reference system. This avoids all discussion about the way the reference system’s performance should be interpreted. Nevertheless, practical implementation of a standard will require the definition of sizing guidelines for design purposes. The method presented in this paper is a simplified approximation of the airflow network in a building. It is conceived as a sizing guideline for natural ventilation systems in the context of a national ventilation standard. Supply, internal and exhaust resistances are the main parameters, next to overall building airtightness. These parameters are system independent and allow to describe a large scale of possible buildings. Five different dwellings, with different typologies, representative for the Flemish building stock, were evaluated for this purpose. The predicted airflow and indoor air quality are compared to that predicted by a detailed multi-zone model and acceptable agreement is found. This yields the conclusion that, for the implementation of a performance-based ventilation standard, straight forward calculation methods for sizing guidelines can be incorporated in the standard.
Keywords
Natural ventilation, Sizing, Code

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Chicago
Laverge, Jelle, and Arnold Janssens. 2009. “A Simple Airlfow Path Approach to Sizing Natural Ventilation Systems in a Code Context.” In Ventilation for Better Productivity, Comfort and Health : Roomvent Conference 2009, ed. Kwang Woo Kim and BW Olesen, 1667–1674.
APA
Laverge, J., & Janssens, A. (2009). A simple airlfow path approach to sizing natural ventilation systems in a code context. In K. W. Kim & B. Olesen (Eds.), Ventilation for better productivity, comfort and health : Roomvent Conference 2009 (pp. 1667–1674). Presented at the 11th International Conference on Air Distribution in Rooms (Roomvent 2009).
Vancouver
1.
Laverge J, Janssens A. A simple airlfow path approach to sizing natural ventilation systems in a code context. In: Kim KW, Olesen B, editors. Ventilation for better productivity, comfort and health : Roomvent Conference 2009. 2009. p. 1667–74.
MLA
Laverge, Jelle, and Arnold Janssens. “A Simple Airlfow Path Approach to Sizing Natural Ventilation Systems in a Code Context.” Ventilation for Better Productivity, Comfort and Health : Roomvent Conference 2009. Ed. Kwang Woo Kim & BW Olesen. 2009. 1667–1674. Print.
@inproceedings{1059435,
  abstract     = {Most of the existing ventilation standards are drafted in a rather prescriptive way. Growing focus on the implementation of rational energy use however, introduces an urgent need for more performance-based criteria. Optimization of energy consumption obviously encompasses minimization of ventilation airflow rates. Comfort, on the other hand, should not be reduced because of these actions. To implement this in a legal figure, one can appeal to the principle of equivalence. This principle states that all systems achieving equivalent performance to that of the systems described in the standard are acceptable. Better yet, a new standard can be devised, imposing a reference performance rather than a reference system. This avoids all discussion about the way the reference system{\textquoteright}s performance should be interpreted. Nevertheless, practical implementation of a standard will require the definition of sizing guidelines for design purposes. The method presented in this paper is a simplified approximation of the airflow network in a building. It is conceived as a sizing guideline for natural ventilation systems in the context of a national ventilation standard. Supply, internal and exhaust resistances are the main parameters, next to overall building airtightness. These parameters are system independent and allow to describe a large scale of possible buildings. Five different dwellings, with different typologies, representative for the Flemish building stock, were evaluated for this purpose. The predicted airflow and indoor air quality are compared to that predicted by a detailed multi-zone model and acceptable agreement is found. This yields the conclusion that, for the implementation of a performance-based ventilation standard, straight forward calculation methods for sizing guidelines can be incorporated in the standard.},
  author       = {Laverge, Jelle and Janssens, Arnold},
  booktitle    = {Ventilation for better productivity, comfort and health : Roomvent Conference 2009},
  editor       = {Kim, Kwang Woo and Olesen, BW},
  keyword      = {Natural ventilation,Sizing,Code},
  language     = {eng},
  location     = {Busan, South Korea},
  pages        = {1667--1674},
  title        = {A simple airlfow path approach to sizing natural ventilation systems in a code context},
  year         = {2009},
}