Abstract
High performance absorption heat transformers based on improved configurations can be proposed with the aim of widening the range of operation of the single stage heat transformer (SSHT). In this paper a two stage heat transformer arranged by coupling the absorber of the first stage to the evaporator of the second stage (TSHT) is analyzed by means of a lumped-parameter mathematical model, written with reference to the water-sulphuric acid system. The computed values of four different indexes of performance show that the proposed TSHT allows one to noticeably increase the gross temperature lift obtainable with a SSHT, while saving a large fraction of the input energy.
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