Abstract
This paper uses the hydraulic and polytropic efficiency concepts in a domain wider than that of their original definition. A generalized Bernoulli equation taken from previous papers is also considered. The aim is to find a general statement yielding hydraulic efficiency values ranging from one to zero, and a relative dissipative term, suitably chosen, that varies between zero and one. This will be following an approach similar to that outlined in previous papers for exergy efficiency. The paper also clarifies the physical meaning of polytropic efficiency as compared with exergy and isentropic efficiency. Two simple numerical examples are also presented to illustrate the different values of the various efficiencies in the same process.
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