Illustrations towards quantifying the sustainability of technology
2000
This paper attempts to quantify the sustainability of
technological processes. It is based on thermodynamics with energy carriers
and materials (products, waste, etc.) expressed in the same
calculable quantity–exergy (Joule). The results have three
considerations. One factor reflects to that extent renewable resources are
used. In addition, the technological efficiency has to be accounted for as
it affects sustainability. Finally, the results take into account the
generation of waste products and the exergy required for converting the
waste into products which are harmless or assimilable in the ecosphere. The
proposed measure of sustainability has been illustrated for two types of
products. In the first illustration, ethanol production was studied. Two
routes were investigated, one starting from fossil oil and the other from
agricultural products. Additionally, a route based on the synthesis from
carbon dioxide and hydrogen was examined, in which hydrogen was generated
by splitting water with electricity from photovoltaic solar energy
conversion. The second product studied was electricity, generated from the
combustion of natural gas or from photovoltaic solar energy conversion. The
merit of the obtained results are that they treat technological
sustainability not only in qualitative but also in quantitative terms. The
insights obtained can help to account for sustainability in the development
of new concepts of chemical technology.
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