| http://www.w3.org/ns/prov#value | - A heat transfer element may be comprised of two, three, or more heat transfer segments. [0054] The tube 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 which is cycled through the heat transfer element 14.
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