The HUMM™ Free-Piston Stirling Engine Technology is widely used in aerospace, energy and military applications for cooling and power generation. It is a proven, dependable and maintenance-free heat transport system.
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The free-piston Stirling engine contains a piston and displacer that float on gas bearings, permanently eliminating the need for lubricating oil.
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The piston and displacer are driven by a low-voltage, linear driver that modulates stroke – creating the Stirling cycle - while maintaining a constant frequency.
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The Stirling Ultracold application of HUMM™ is based on a tuned offset between the piston and displacer which optimizes the system cooling efficiency to the lowest point in the operating range, below -86°C. This assures that the Shuttle™ has the greatest reserve cooling capacity and temperature recovery capability at ultra low temperatures, unlike cascade refrigeration systems which inherently function with greatest reserve at little-used warmer setpoints.
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When the system demands cooling, the stroke length increases while the frequency remains constant, permitting the system to operate continuously without noise or wear.
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When the setpoint is achieved, the stroke is minimized, further reducing energy consumption and extending operating time at its lowest temperature when running on a UPS or battery system.
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