Economic Aspects of the Magnetocaloric Energy Conversion - Magnetocaloric Energy Conversion: From Theory to Applications - page 372

Fig. 9.7 The cost of solenoidal and toroidal superconducting magnets

Q R 0 : 63

Q R kW

COST Mil ð US$ Þ ¼ 2 6 ðÞ ð 9 10 Þ

: : :

where the refrigeration power was de ned as the design refrigeration power in 0,

normalized to the temperature of 4.5 K. A similar equation was given for small
cryocoolers (0.1 10 W of cooling at 4.2 K) [ 22 ]:

-

Q R 0 : 38

Q R W

COST 1000 ð US$ Þ ¼ 37 ðÞ ð 9 11 Þ

:

where the refrigeration power was de ned as the design refrigeration power in

Watts, normalized to the temperature of 4.2 K. Figure 9.8 (left) shows the cost of
helium refrigerators (cold boxes and compressors) for refrigeration at 4.5 K. The
calculation was based on Eq. ( 9.10 ). Figure 9.8 (right) shows the capital cost of

Fig. 9.8 The cost of helium refrigerators (left large-scale helium refrigerators; right small-scale
helium refrigerators)