Effect of Thermal Cycling on Operational Characteristics and Lifetime Prediction of Space Pulse Tube Refrigerator

Table 1

Basic specification of the PTRs.

Parameter	Value
	Type A	Type B
Cooling capacity	1 W at 60 K	5 W at 80 K
Total mass	7.5 kg	8.2 kg
Operational frequency	50 Hz	50 Hz
Maximum power consumption	80 W	120 W
Configuration	Single stage	Single stage
Pressure of helium gas	3.25 MPa	3.25 MPa
Designed lifetime	8 years	8 years
Sample size	2	2
Reject temperature
Nonoperation	223–323 K	223–323 K
Operation	243–283 K	243–283 K