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The Interactive Response of Sma Springs which Control the Position of Dampers in Personal Environments™

Published online by Cambridge University Press:  16 February 2011

Paul E. Thoma ,
Yefim Ivshin  and
Kurt D. Schachner
Paul E. Thoma
Affiliation:
Johnson Controls, Inc., Central Research, P. O. Box 591, Milwaukee, WI 53201-0591, USA
Yefim Ivshin
Affiliation:
Johnson Controls, Inc., Central Research, P. O. Box 591, Milwaukee, WI 53201-0591, USA
Kurt D. Schachner
Affiliation:
Formerly with Johnson Controls, Inc., Milwaukee, WI 53201, USA
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Abstract

Personal Environments™ is a Johnson Controls, Inc. system for the control of indoor office environments. In this system, four SMA coiled extension springs interact to control the position of two dampers. Two opposing SMA springs connected to one damper control the percentage of primary conditioned air entering the system, and two opposing SMA springs connected to the second damper control the percentage of room air reentering the system.

The interactive operation of the SMA springs is discussed and a model is presented on the interactive response of the SMA springs. The SMA spring transformation temperatures, force - strain relationship, and the experimentally measured interactive response to temperature are presented and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 507
Copyright
Copyright © Materials Research Society 1995

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References

1.AbuJudom, D.N., Thoma, P.E., and Fariabi, S. in Proceedings of the 61h International Conference on Marlensitic Transformations (ICOMAT '89), held in Sydney, Australia, July 3-7, 1989, edited by Muddle, B.C. (Materials Science Forum, Volumes 56-58, 1990, Part II -Trans Tech Publications, Ltd.) pp. 565-570.Google Scholar
2.Thoma, P.E., Kao, M., Fariabi, S., and AbuJudom, D.N. in Proceedings of the International Conference on Martensitic Transformations (ICOMAT-92), held in Monterey, California, July 20-24, 1992, edited by Wayman, C.M. and Perkins, J. (Monterey Institute of Advanced Studies, 1993) pp. 917–922.Google Scholar
3.AbuJudom, D.N., Thoma, P.E., Hajny, R.V., Linstead, S.A., and Schultz, B.R., U.S. Patent No. 5,176,544 (5 January 1993).Google Scholar