Actions for Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report [electronic resource].

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Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1982.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 95 : digital, PDF file
Additional Creators
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The work done to extend the existing drain-down valve technology to provide passive drain-down freeze protection for thermosyphon-based solar water heaters is described. The basic design of the existing valve model is that of a spool valve, employing a cylindrical spool which moves axially in a mating cartridge to open and close o-rings at the two operating extremes (drain and operate) to perform the valving function. Three passive actuators to drive the basic valving mechanism were designed, fabricated, and tested. Two piping configurations used to integrate the spool valve with the thermosyphon system are described, as are the passive actuators. The three actuator designs are: photovoltaic driven, refrigerant-based bellows, and heat motor cable-drive designs. Costs are compared for the alternative actuator designs, and operating characteristics were examined for the thermosyphon system, including field tests. The market for the valve for thermosyphon systems is then assessed. (LEW)
Report Numbers
E 1.99:doe/cs/30533-1
doe/cs/30533-1
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
04/30/1982.
"doe/cs/30533-1"
"DE83001015"
Sunspool Corp., Palo Alto, CA (USA)
Funding Information
FC02-80CS30533
View MARC record | catkey: 14798274