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- W2916019110 abstract "The use of physico-chemical life support systems will be a limiting factor on future long-duration human spaceflight missions due to the lack of frequent resupply capability. Cultivation of algae in a photobioreactor is a promising bioregenerative alternative for combined air revitalization, waste water treatment, and food supplement production.This thesis presents the development of a dynamic growth model for the green microalgae Chlorella vulgaris. The model can dynamically react to the varying influences of carbon dioxide and nutrient availability for photosynthesis, growth medium pH, temperature, carbon dioxide and oxygen concentration in the medium and the availability of photosynthetic active radiation. Complex sub-models for the representation of pH changes in the growth medium and the propagation of photosynthetically active radiation through a photobioreactor geometry at varying biomass concentrations are also part of the overall model.Experiments are conducted and presented in this thesis, which generate data in areas where literature sources show a large variance or only scarce data is available. The experimental results in the areas of growth rate determination, varying radiation attenuation in a growing microalgal culture and required surface irradiances for optimum growth are integrated into the model to increase its confidence level.The Chlorella vulgaris growth model is implemented in V-HAB, a MATLAB based life support system simulation tool, which has been under development at the Institute of Astronautics at the Technical University of Munich since 2006. In the V-HAB environment, the growth model is implemented in a newly designed high-efficiency photobioreactor developed at the University of Colorado Boulder and integrated in a simulated cabin environment with a sophisticated human model in the loop. The combination of the algae model in a photobioreactor and the borad functionalities of the V-HAB simulation environment allows the simulation of a biological life support system for future human spaceflight missions. The simulated system is able to reach 100 % air revitalization and urine processing capability, as well as some food supplement production. With an optimistic growth model an algal culture volume of 21.5 liters or 32 liters is required depending on the attainable flow channel thickness, with a more pessimistic one, 500 liters are necessary to support one human in terms of air revitalization and urine processing.Furthermore, the developed model is shown to have the capability of optimizing photobioreactor-designs and operational decisions such as the overall growth volume, culture depth, optimum continuous biomass concentration, the profile of provided photosynthetically active radiation and air supply parameters." @default.
- W2916019110 created "2019-03-02" @default.
- W2916019110 creator A5064441681 @default.
- W2916019110 date "2018-01-01" @default.
- W2916019110 modified "2023-09-27" @default.
- W2916019110 title "Development of a Dynamic Simulation Model for Performance Prediction of Photobioreactors in Biological Life Support Systems for Human Spaceflight" @default.
- W2916019110 hasPublicationYear "2018" @default.
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