Emergy paths computation from interconnected energy system diagram

The aims of this paper are as follows. (i) Explain how to transform an energy system diagram into an emergy graph. (ii) Provide a clear and new algorithm easily programmable to compute emergy pathways. (iii) Insert this new algorithm in the whole procedure for computing an emergy flowing between two processes. (iv) Apply the whole procedure on a real world example. This example shows that the emergy content from meadowland-sun can either carry out by the milk or by the electricity (when considering the biogas and the CHP plant). In the general case, this emergy amount is lesser than the total meadowland-sun emergy.