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TECHNICAL PAPERS

Model of Human/Liquid Cooling Garment Interaction for Space Suit Automatic Thermal Control

[+] Author and Article Information
Karen L. Nyberg, Kenneth R. Diller

Department of Mechanical Engineering, Biomedical Engineering Program, The University of Texas at Austin, Austin, TX 78712

Eugene H. Wissler

Department of Chemical Engineering, Biomedical Engineering Program, The University of Texas at Austin, Austin, TX 78712

J Biomech Eng 123(1), 114-120 (Oct 13, 2000) (7 pages) doi:10.1115/1.1336147 History: Received August 22, 1999; Revised October 13, 2000
Copyright © 2001 by ASME
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References

Shitzer,  A., Chato,  J. C., and Hertig,  B. A., 1973, “Thermal Protective Garment Using Independent Regional Control of Coolant Temperature,” Aerosp. Med., 44, pp. 49–59.
Wissler, E. H., 1985, “Mathematical Simulation of Human Thermal Behavior Using Whole Body Models,” in Heat Transfer in Medicine and Biology, A. Shitzer and R. C. Eberhart, eds., Plenum Press, New York, Vol. 1, pp. 325–373.
Wissler,  E. H., 1986, “Simulation of Fluid-Cooled or Heated Garments That Allow Man to Function in Hostile Environments,” Chem. Eng. Sci., 41, pp. 1689–1698.
Nyberg, K. L., Diller, K. R., and Wissler, E. H., 1997, “Modeling of Human Thermal Regulation for Liquid Cooling Garment Applications,” Advances in Heat and Mass Transfer in Biotechnology, ASME HTD-Vol. 355/BED-Vol. 37, pp. 119–126.
Hexamer,  M., and Werner,  J., 1996, “Control of Liquid Cooling Garments: Technical Control of Body Heat Storage,” Appl. Human Sci., 15, No. 4, pp. 177–185.
Nyberg,  K. L., Diller,  K. R., and Wissler,  E. H., 2000, “Automatic Control of Thermal Neutrality for Space Suite Application Using a Liquid Cooling Garment,” Aviatn. Space Envir. Med., 71, pp. 904–915.
Nyberg, K. L., 1998, “Design and Evaluation of Automatic Control for Human/Liquid Cooling Garment Thermal Interaction,” Doctoral Dissertation, The University of Texas at Austin.
Aoyagi,  Y., and McLellan,  T. M., 1996, “Determation of Body Heat Storage: How to Select the Weighting of Rectal and Skin Temperatures for Clothed Subjects,” Arch. Occup. Environ. Health, 68, pp. 325–336.
Webb,  P., 1993, “Heat Storage and Body Temperature During Cooling and Rewarming,” Eur. J. Appl. Physiol., 66, pp. 18–24.
Kuznetz, L. H., 1977, “Automatic Control of Human Thermal Comfort With a Liquid Cooled Garment,” NASA TM-58205.

Figures

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Transient metabolic profile which was followed for all experimental trials, based on variations in intensity of work on an arm-crank ergometer
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Numerical (bold) simulations via the Wissler model compared to experimental mean (broken line) ± standard deviation (vertical lines) for thermal parameters of physiological and automatic control system performance during a standard exercise protocol at three different environmental temperatures. Tin=LCG water inlet temperature, Tear = ear canal temperature, Tskin= mean skin temperature, ΔS = change in body energy storage. Metabolic rate input to the model was taken as the mean of nine test subjects and is displayed as the bottom plot
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Numerical simulation of the effect on controller performance of alternate ratios, α, of weighting factor for skin to core temperature in calculating mean body temperature, Tin=LCG water inlet temperature, Tear = ear canal temperature, Tskin= mean skin temperature, and ΔTbody= change in mean body temperature. Simulations were run for WARM and COLD environments
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Numerical simulation of the effect of suit vent flow on controller performance Tin=LCG water inlet temperature, ΔTbody=change in mean body temperature. Simulations were run for WARM and COLD environments
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Six-hour Wissler model simulation of controller performance in fixed temperature (26.7°C) and variable temperature (bottom plot) environments. Tin=LCG water inlet temperature, ΔTbody= change in mean body temperature, ΔS=change in body energy storage

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