Heat Exchangers

Heater and cooler geometry, in this design, is based on a fin-tube structure that is fabri­cated by press-fitting tubes through stacks of etched metal fins, Figure 4.7. With hydraulic diameter of about 0. 5 mm, the design is optimized for lower frequencies with pumping power in the range of 0.2-0.8 W for the heater and cooler combined, and a temperature drop of 2-3 °C for each at nominal input thermal power of about 300 W. The regenerator is a stack of woven wire screens with circular cross-section wire. With hydraulic diameter

Heat Exchangers

Figure 4.7: Fabricated heat exchanger shown with the etched fins and copper tube inserts.

Of about 0.2 mm, the design requires a pumping power of about 0.8-1 W for the regen­erator. The tubing and fittings are analyzed analogously to the heater and cooler. The corresponding fluid flow dissipation is evaluated using the mean cross-sectional velocity of the fluid and correlations outlined in chapter 3.2.1. Consequently, these losses contribute an additional 0.5-2 W to the total flow friction dissipation. Total displacer power loss is estimated to be in the range of 2.05-5.4 Watts.

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