| http://www.w3.org/ns/prov#value | - A heat transfer element may be comprised of 1, 2, 3 or more segments. [0086] The bellows sections 22 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 14.
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