Sterling Cryocooler

Stirling Cryocooler

The difference between Refrigerator and Cryocooler

Regenerator

History of Stirling Cryocooler : • The Stirling engine was invented by Robert Stirling in 1816. • He was a Scottish minister. • At that time, Stirling engines were recognized as a safe engine that could not explode like steam engines of that era often did.

•An bloom of Stirling engine production was brought by J. Ericsson, a Swedish inventor and engineer. •He succeeded in manufacturing a practical Stirling engine of the 0.5 ~ 5 horsepower class by around 1850. •The capacity of Stirling engines in those days was inferior compared with Otto engines and diesel engines.

What’s a Stirling cycle?

1->2 constant-temperature compression at TL 2->3 constant- volume heat absorption 3->4 constant- temperature expansion at TH 4->1 constant-volume heat rejection

Schematic of 55 W Stirling Cryocooler Linear Alternator Stationary Magnets Moving Iron

Power Piston Flexures

Cooler Heater supplied Regenerator

Displacer Power Piston Piston Displacer Flexures

(Courtesy of NASA Glenn Research Center)

Test Section Geometry Isolation duct Regenerator

Cylinder

Heater One of the regenerator screens

Flow distributor Piston

Regenerator The required characteristic

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Specific heat is large Thermal conductivity is large

Magnetic material is used

The kind of cryocooler ・ GM Cooler ・ Stirling Cooler ・ Brayton Cooler ・ GM Pulse Tube Cooler ・ Stirling Pulse Tube Cooler ・ JT Cooler

Stirling cryocooler Advantage ・ Low vibration ・ need not maintain ・ Efficient

Applications

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