| http://www.w3.org/ns/prov#value | - A heat transfer element according to the present invention may include two, three, or more heat transfer segments. [0061] The bellows sections 25, 27 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 that is cycled through the heat transfer element 14.
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