Abstract
Cooling performance of pulse tube refrigerators was investigated in a temperature range from about 270K to 80K to apply cooling systems for a temperature range higher than the liquid nitrogen temperature. Helium and nitrogen were used as a working gas. It is found that performance of refrigerator with nitrogen is more influenced by the connecting tube between a hot end of pulse tube to a reservoir than that with helium, and pulse tube refrigerators that are deigned and optimized for helium didn't always work as refrigerators with high performance for nitrogen.
