| http://www.w3.org/ns/prov#value | - A heat transfer element 70 according to the present invention may be comprised of two, three, or more heat transfer segments 72. [0093] The bellows sections 78 are formed from seamless and nonporous materials, such as metal, and therefore are impermeable to gas, which can be particularly important, depending on the type of working fluid which is cycled through the heat transfer element 70.
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