Cabin Bioaerosol Control: HEPA Filtration Loop |…

What is Bioaerosol Control?

Bioaerosols are airborne microorganisms, including bacteria, viruses, fungi, and their spores. In confined spaces like spacecraft cabins, bioaerosols can pose significant health risks to crew members.

HEPA (High-Efficiency Particulate Air) filtration is a critical technology used to remove these particles from the air, ensuring a clean and safe environment.

The Role of HEPA Filters

HEPA filters are designed to capture at least 99.97% of airborne particles as small as 0.3 micrometers in diameter.

In the context of a spacecraft cabin, HEPA filtration helps maintain air quality by filtering out bioaerosols generated by crew members and other sources.

live demo · related simulation● LIVE

Air-Exchange Rate and Cabin Volume

The air-exchange rate (ACH) is the number of times per hour that all the air in a space is replaced with fresh air. A higher ACH can help reduce bioaerosol concentrations more quickly.

Cabin volume plays a crucial role as well, since larger volumes require more time for filtration to achieve the same concentration reduction.

Modeling Bioaerosol Dynamics

The model simulates the balance between crew-generated bioaerosols and their removal by HEPA filters in a well-mixed compartment, described by ordinary differential equations (ODEs).

By adjusting sliders for crew size, ACH, filter efficiency, and cabin volume, one can observe how these factors influence the steady-state concentration of bioaerosols.

Frequently asked questions

How does HEPA filtration work?

HEPA filters use a combination of mechanical impaction, interception, diffusion, and electrostatic attraction to capture airborne particles.

Why is air-exchange rate important in bioaerosol control?

A higher ACH can dilute the concentration of bioaerosols more quickly, reducing the risk of exposure for crew members. However, it also increases energy consumption and costs associated with air conditioning.

What happens if a HEPA filter becomes clogged?

A clogged filter reduces its efficiency, allowing more bioaerosols to pass through, which can increase the risk of contamination in the cabin environment.

How does cabin volume affect bioaerosol control?

Larger volumes require more time for filtration to achieve the same concentration reduction as smaller volumes. This is because there are simply more air molecules to filter through, even with an efficient HEPA system.

Try it live

Everything above runs in your browser — open Cabin Bioaerosol Control: HEPA Filtration Loop and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Cabin Bioaerosol Control: HEPA Filtration Loop simulation