Using V-HAB to Model and Simulate Air Revitalization System Technologies Developed at JAXA



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45th International Conference on Environmental Systems


The dynamic life support system (LSS) simulation software Virtual Habitat (V-HAB) has been under development at the Technische Universit ̈at Mu ̈nchen (TUM) since 2006. The Matlab⃝R -based V-HAB software suite dynamically simulates habitat life support sys- tems and their interaction with a detailed human model, as well as the external envi- ronment of the habitat. During that process, models of different LSS technologies were created, with varying levels of fidelity, some representing more generalized and generic technological concepts, others depicting a specific system if according data was available. At the Innovative Technology Research Center at the Japan Aerospace Exploration Agency (JAXA) in Tokyo, research is being conducted to develop a regenerative air revi- talization subsystem, consisting of three technologies: a two-bed molecular sieve (2BMS), a Sabatier reactor and an electrolysis unit. During the last years, with varying degrees of intensity, work has been done to implement models of these systems in V-HAB. That work was performed both in the context of term papers and theses at TUM, as well as during two internships directly at JAXA. This paper aims to present some of the work that was done as well as the underlying V-HAB framework and modeling approach, as this determines the simulation capabilities. Subsequently, the implementation of different components and technologies is described, spanning from the original flow rate simulations and a successive flow rate / bottle neck optimization for the 2BMS, to the application of the fixed bed adsorber (FBA) model that was implemented to represent the CO2 adsorption in the zeolite filter. Ongoing work is also described that aims to implement more detailed models of the Sabatier reactor and Electrolyser. Lastly, some examples of system level simulations incorporating these models are de- scribed, showing how they can be used to examine different relationships between the subsystems. After additional validation, these simulations will serve as a basis for further studies, e.g. an integrated simulation of the JAXA systems and the already in V-HAB im- plemented and validated models of the International Space Station (ISS) air revitalization loop.


Bellevue, Washington
Jonas Schnaitmann, Technische Universitat Munchen, Germany
Benjamin Portner, Technische Universitat Munchen, Germany
Roland Haber, Technische Universitat Munchen, Germany
Masato Sakurai, Technische Universitat Munchen, Germany
The 45th International Conference on Environmental Systems was held in Bellevue, Washington, USA on 12 July 2015 through 16 July 2015.