CryoTel® GT User’s Manual Version 6 P a g e | 13
Figure 11: Water Jacket Heat Rejection
B. Copper Fins
Copper fins are also available in a permanent or removable form. If copper fins are used for heat
rejection (Fig. 12-permanent fins are pictured), use a fan with a rating of 100 cubic feet per minute (1.6e-
3 m
3
/min) for air through-flow. Sunpower recommends mounting the fan to a cylindrical shroud that can
be placed around the fins in order to direct the air through the fins. Note that some heat rejection also
occurs from the walls of the pressure vessel. Therefore avoid permitting any containment structure for
the cryocooler to hinder the heat rejection from any part of the cooler. It is also recommended to
electrically interlock the cooling fan and the controller in order to ensure that the cooler cannot operate
without also turning on the fan.
Figure 12: Cooling Fin Heat Rejection
C. Conducting Solid
Use of any other means of heat rejection necessitates ensuring that the proper amount of heat is being
transferred away from the rejecter and that the reject temperature is suitable. It is recommended to
involve Sunpower with the design of a conduction heat exchanger.
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