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Table 4.12 Outputs from the thermal dynamic model
Output Unit
Steady state outputs
Chamber water temperature °C
Steady state chamber air temperature °C
Steady state evaporation rate kg/s
Steady state chamber air specific humidity Decimal
Steady state air temperature at HADT lump °C
HADT lump wall temperature °C
Gap between lump wall temperature and airflow dew point °C
Mask wall temperature °C
Steady state mask air temperature °C
Dynamic outputs
Dynamically fluctuating chamber air specific humidity Decimal
Averaged dynamic chamber air specific humidity Decimal
Dynamically fluctuating evaporation rate in the chamber kg/s
Averaged dynamic evaporation rate in the chamber kg/s
Dynamically fluctuating chamber air temperature °C
Averaged dynamic chamber air temperature °C
In-HADT flow velocity comparison between steady flow and
fluctuating flow
Dynamically fluctuating air specific humidity at HADT lump Decimal
Dynamically fluctuating air temperature at HADT lump °C
Dynamically fluctuating condensation/evaporation rate at HADT lump kg/s
Net condensation/evaporation rate at HADT lump in a breath cycle kg/s
Dynamically fluctuating air specific humidity in the mask Decimal
Dynamically fluctuating air temperature in the mask °C
Dynamically fluctuating condensation/evaporation rate in the mask kg/s
Net condensation/evaporation rate in the mask over a breath cycle kg/s
Averaged specific humidity in inhaled air kg/s
Averaged temperature of inhaled air °C
The block diagram of the whole thermodynamic system is shown in Figure 4.11 and the
Simulink TM model is shown in Figure 4.16 and Figure 4.13.
88
m/s