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Environmental and life support system (ECLSS) examples
Temperature and humidity control system
This example represents the temperature and humidity control of a spacecraft. The flow sheet of the main system of the example model is shown in the following figure, indicating its main constitutive parts:
The system consists of the following parts:
- An "Inlet_w" component, labelled as "h2o_source", that represents the water vapour produced by the crew and some equipment items.
- A "cabin" component, also labelled as cabin.
- A "thc" sub-system, also labelled as thc, the flow sheet of which is shown in the following figure.
The experiment consists in a change of the temperature set-point with a step after 10 seconds. A steady state solution is requested before the transient solution in order to start the transient from a stabilised condition.
The following figures show the evolution of the temperatures in the cabin and the temperature measured by the sensor during the simulation (all the temperatures are showed in °C), and the position of the temperature control valve:
Air management system
This example represents the simulation of an Air Management System (AMS), which has been developed by integrating the following parts into one system:
- A "cabin" component.
- A "crew" component.
- A "THC" sub-system that represent the temperature and humidity control sub-system.
- A "co2rem" sub-system that represent the CO2 removal sub-system.
- A "cntrl_O2_N2" sub-system that represents an air controller.
- And an "orifice" component that represent an air leakage.
The experiment consists of imposing a daily cycle for crew activity, determined by the metabolic activity rate per crew member:
The following figures show the evolution of the CO2 partial pressure in the cabin air, the temperature in the cabin and the temperature measured by the sensor during the simulation (all the temperatures are in °C), and the relative humidity measured in the cabin air:
