Phase Change Device for Use within a Volume of Fluid
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United States of America Patent
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Issued Date -
Feb 18, 2016
app pub date -
Aug 12, 2014
filing date -
Aug 12, 2014
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Abstract
A phase-change device for use in a volume of fluid, comprising a pressure vessel; a displacement cylinder; a displacement piston; a drive cylinder containing a phase-change material; a drive piston; and a gas spring. As the device sinks and experiences cooler fluid temperatures, the phase change material reduces in volume, causing the drive cylinder to move relative to the drive piston and thereby exert an outward force on the displacement piston. The displacement piston is pulled away from the displacement cylinder, increasing the overall displacement of the device. The increase in displacement increases the buoyancy of the device, thereby causing the device to rise in the fluid.
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