International Space Station United States Operational Segment Crew Quarters On-orbit vs. Design Performance Comparison

Numerical and experimental study of the International Space Station crew quarters ventilation

“…This fact justifies the present work. The CQ ventilation system settings were designed experimentally on Earth, previous to the CQ's deployment to the ISS [10]. The two axial fans of the ventilation system are provided with a controller allowing the occupant of the CQ to vary the air flow rate.…”

“…However, one must note here that the corresponding experimental velocity fields are not available in the literature. The given velocity values (in the range of 0.051-0.23 m/s) [10] were probably obtained using a punctual portable thermo-anemometer, which can only provide indications of velocity levels, without providing a global view of the flow in the cabin and its interaction with the occupant. During these experiments on Earth, the noise level in the cabin exceeded the NC-40 curve by 3-5 dB at frequencies between 250 -750 Hz [8,10].…”

Numerical study of the air distribution in the Crew Quarters on board of the International Space Station

“…Accumulation and re-breathing of CO2 in expired air has been investigated as a possible indication for crew discomfort onboard the International Space Station (ISS) [2]. Likewise, inadequate airflow contributes to increasing temperature that also leads to crew discomfort.…”