Performance Characterization of the Sunpower Cryocooler
The Sunpower 140K cryocooler is an integral in-line single compressor/single displacer configuration that features the use of low friction gas bearings on all running surfaces. The design is very compact, simple, and light-weight. This type of cryocooler was originally intended for use in the electronics industry. The original machine provided 35 watts of cooling at 223 K at a heatsink temperature of 45°C with 65 watts of input power. The 140 K cooler, characterized by JPL, is a modified version of the original cooler and achieves 4 to 8 watts of cooling over the temperature range 120 K to 140 K with less than 70 watts of input power.
The Sunpower 140K cryocooler was characterized by JPL in a number of performance areas including thermal, vibration, resonance, EMI, and off-state parasitics. The results of these measurements are presented; where possible, the measurements are compared with calculated performance curves.
KeywordsInput Power Thermal Performance Load Curve Drive Voltage Compressor Stroke
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