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Exploring Air Quality Parameters and Their Impact on Indoor Ventilation Effectiveness

This lecture aims to deepen understanding of air quality (IAQ) parameters and their interrelation with natural ventilation systems. It covers methodologies to define and validate research projects focused on air change effectiveness, contaminant removal efficiency, and the dynamics of airflow within built environments. Students are encouraged to explore various engineering problems concerning air distribution, pollutant concentration, and the effectiveness of ventilation strategies, including buoyancy and cross-ventilation. Participants will be equipped with tools to analyze air quality metrics such as age of air, air change rates, and the implications of airflow patterns on indoor environments.

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Exploring Air Quality Parameters and Their Impact on Indoor Ventilation Effectiveness

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Presentation Transcript

  1. Lecture Objectives Answer your question related to the software Define your final project Compare parameters for Air Quality analyses • Air-change effectiveness • Contaminant removal effectiveness

  2. Final project topics Open for various topics • Research problems • Different environmental engineering problems • Natural ventilation in buildings - validation • Smoke distribution simulation • Unsteady-state flow • Your topic • Various Engineering Problems • Natural ventilation – buoyancy and cross-ventilation • Exhaust and supply air positions in large spaces • Your topic

  3. IAQ parameters Number of ACH quantitative indicator ACH - for total air - for fresh air Ventilation effectiveness qualitative indicator takes into account air distribution in the space Exposure qualitative indicator takes into account air distribution and source position and intensity

  4. IAQ parameters • Age-of-air air-change effectiveness (EV) • Specific Contaminant Concentration contaminant removal effectiveness e

  5. Single valueIAQ indicatorsEv and ε • Contaminant removal effectiveness (e) • concentration at exhaust • average contaminant concentration Contamination level • 2. Air-change efficiency (Ev) • shortest time for replacing the air • average of local values of age of air Air freshness

  6. Depends only on airflow pattern in a room We need to calculate age of air (t) Average time of exchange What is the age of air at the exhaust? Type of flow Perfect mixing Piston (unidirectional) flow Flow with stagnation and short-circuiting flow Air-change efficiency (Ev)

  7. Air exchange efficiency for characteristic room ventilation flow types

  8. Contaminant removal effectiveness (e) • Depends on: • position of a contaminant source • Airflow in the room • Questions 1) Is the concentration of pollutant in the room with stratified flow larger or smaller that the concentration with perfect mixing? 2) How to find the concentration at exhaust of the room?

  9. Ev= 0.41 e= 0.19 e= 2.20 Differences and similarities of Evande Depending on the source position: - similar or - completely different air quality

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