One Take #12 - Pandemic Air Math: When Average Just Won't Cut It

Air Quality Matters

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We explore the scientific approach behind ASHRAE Standard 241, developed to address airborne infection control in buildings during profound uncertainty. The standard represents a paradigm shift in how engineers design ventilation systems to manage risks from infectious aerosols.
• Confronting the challenge that viral emissions from infected individuals vary across seven orders of magnitude
• Abandoning deterministic models in favor of Monte Carlo simulations that embrace uncertainty
• Setting a specific risk target: keeping infection probability below 0.1% in 96% of scenarios
• Creating the concept of eACH (equivalent clean airflow rate) as a universal currency for clean air
• Revealing that older standards like ASHRAE 62.1 were significantly inadequate for infection control
• Establishing different ventilation requirements based on space type and occupancy patterns
• Acknowledging that even well-designed systems cannot eliminate risk completely
Risk modeling for ASHRAE Standard 241-2023 — Control of infectious
aerosols
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Chapters

1. Introduction to One Take (00:00:00)

2. The Challenge of Viral Uncertainty (00:01:15)

3. Probabilistic Modeling Approach Explained (00:03:22)

4. Setting Risk Tolerance Benchmarks (00:05:37)

5. Comparing New Standards to Old (00:07:17)

6. Final Takeaways and Conclusions (00:09:15)

118 episodes

#Science #Simon Jones #Air Quality #Ventilation #Iaq #Workplace #Healthcare #Built Environment #Tech #Natural Sciences #Health and Well-Being #House #Podcasting Education