| http://www.w3.org/ns/prov#value | - If the highest performance ratio is less than unity, at least one heat exchanger will be required.The novel features of this invention, as well as the invention itself, will be best understood from the attached drawings, taken along with the following description, in which similar reference characters refer to similar parts, and in which:BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a graph of enthal
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