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Early Human Testing of Advanced Life Support Systems, Phase I
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Abstract
The Crew and Thermal Systems Division (CTSD) at NASA's Johnson Space Center under the support of the Office of Life and Microgravity Sciences and Applications is conducting the Early Human Testing Initiave (EHTI) project with the goal of validating regenerative life support technologies through a series of integrated tests with human subjects. The EHTI project is organized into three distinct phases, each with progressively more complex integration of biological and physicochemical (P/C) life support technologies. The goal of Phase I is to conduct a 15-day one-person test to verify the performance of an air revitalization system based on higher plants with physicochemical systems as complements and backups. The test will be performed in CTSD's Variable Pressure Growth Chamber (VPGC), a tightly closed controlled-environment test chamber configured with approximately 11 m2 of area for plant growth. A dense, actively-growing stand of wheat will be grown to provide a minimum of one human metabolic load of oxygen production and carbon dioxide removal through the process of photosynthesis. The test subject will reside in the chamber's air lock, which will be set-up with accommodations for habitation. The atmosphere will be recirculated between the airlock and growth chamber at a defined rate. Three different methods of gas composition control will be evaluated in series over a continuous 15-day period: 1) use of P/C systems and storage buffers to trim off differences in metabolic rate between the test subject and plants; 2) modulation of photosynthetic rate to match the test subject's metabolic load by active control of photosynthetic photon flux and 3) modulation of photosynthetic rate to match the test subject's metabolic load by limiting the amount of carbon dioxide available to the plants.
Authors
Citation
Barta, D., Dominick, J., and Kallberg, M., "Early Human Testing of Advanced Life Support Systems, Phase I," SAE Technical Paper 951490, 1995, https://doi.org/10.4271/951490.Also In
References
- Barta, D.J. Henninger D.L. “Regenerative Life Support Systems - Why do we need them?,” Adv. Space Res 14 11 403 410 1994
- Henninger, D.L. Tri T.O. “Advanced Life Support Project Plan,” JSC-38092 NASA Johnson Space Center June 1994
- Tri, T.O. Henninger D.L. “Progress on Development of the Advanced Life Support Human-Rated Test Facility,” SAE Paper 951691 25th International Conference on Environmental Systems San Diego July 1995
- Laws, B.A. Price D.F. Foerg S.L. “Early Human Testing of Advanced Life Support Systems, Phase II/III,” SAE Paper 951491 25th International Conference on Environmental Systems San Diego July 1995
- Wheeler, R.F. Drese J.H. Sager J.C. “Atmospheric leakage and condensate production in NASA's biomass production chamber. Effect of diurnal temperature cycles,” NASA technical memorandum 103819 NASA-KSC Florida 1991
- Knight, S.L. “Constructing specialized plant growth chambers for gas exchange research: concerns and considerations,” HortScience 27 767 769 1992
- Key, C.F. “Materials Selection List for Space Hardware Systems,” NASA MSFC Handbook No. 527 Rev. F JSC No. 09604 Rev. F September 30 1988
- Ewert, M.K. Barta D.J. Paul T.H. “Design, Analysis and Testing of a Thermal Control System for Plant Growth Lighting Using Coldplate Technology,” SAE Paper 951663 25th International Conference on Environmental Systems San Diego July 1995
- Boehm, A.M. Cusick R.J. “A Regenerable Solid Amine CO 2 Concentrator for Space Station,” SAE Paper No. 820847 12th lntersociety Conference on Environmental Systems San Diego, CA July 19-21 1982
- Bugbee, B.G. Salisbury F.B. “Exploring the Limits of Crop Productivity, 1. Photosynthetic efficiency of wheat in high irradiance environments,” Plant Physiol 88 869 878 1988
- Wheeler, R. M. Corey K.A. Sager J.C. Knott W.M. “Gas Exchange Characteristics of Wheat Stands Grown in a Closed, Controlled Environment,” Crop Science 33 1 161 168 1993
- NASA “Environmental Control and Life Support System Architectural Control Document,” SSP 30262 Revision D Space Station Freedom Program Office, NASA Reston VA, U.S.A. 1991