Cooling Techniques

The free piston Stirling cooler (FPSC) is used as the cooling source in the RTC-159 Ultra cooler that has heating as well as cooling capabilities. The FPSC is a Stirling heat pump in which a small amount of helium gas is used as a heat transport medium, in the place of conventional refrigerants.

free piston Stirling cooler (FPSC)

Benefits of FPSC

The FPSC is advantageous over conventional cooling systems in terms of environmental-friendliness and energy efficiency. These benefits are achieved with the help of the advanced technology and as a result of being CFC, Freon, and HFC free.

The FPSC includes two main moving parts (displacer and piston) oscillating in a linear motion along the same axis inside a single cylinder that is installed in a stainless steel casing. The helium gas is repeatedly compressed and expanded by the piston to cool the tip (cold head) of the casing’s extended part.


The FPSC cooling source equipped in the RTC-159 Ultra cooler can be used to cool an object to a temperature of −50 °C and −100 °C at an ambient temperature of 23 °C. The efficiency of FPSC can be as high as six times the efficiency of thermoelectric (Peltier) coolers.

This information has been sourced, reviewed and adapted from materials provided by AMETEK Sensors, Test & Calibration.

For more information on this source, please visit AMETEK Sensors, Test & Calibration.


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