Exergy & Anergy?
Can anyone explain exergy and anergy to me in the context of fuel cells?
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Definition: Exergy is the share of the energy content of a system that could be converted to work at most until full compensation with the environment.
Initially, the admixing energy of the reactants consists of 100% of exergy, provided that the ambient temperature T0 is used in the admixing energy:
Source: ETH Zurich
Since the fuel cell does not convert the chemical energy via the transfer of heat into electrical energy, it would theoretically be possible to convert the entire chemical exergy to 100% into electrical exergy.
However, this does not happen in practice, as losses occur in any real technical process. Losses in the context entail the production of anergy which heats the fuel cell. However, the power loss is not pure anergy, since there is a temperature difference to the environment. From the waste heat, it would therefore be necessary to calculate the excess which is due to the difference between the cell demoerature and the ambient temperature. The excess of the heat loss is obtained by multiplying it with the degree of carnot efficiency.
What I did not understand is a Senkey chart from the lecture: I have a heat flow Qzu, with this I generate an electric guidance Pel. The dissipated heat flow now consists of anergy (the heat which corresponds to the ambient temperature), of loss xergy and of exergy. Why is there anything else in Qab? The only exergy which is still present in the dissipated heat flow can no longer be used industrially due to the small difference to the environment and would therefore be classified for me under loss allergy.
This is then not a fuel cell, but, for example, a sterling motor.
Are you sure that’s what you said? I would rather say that the exergy is more precisely divided into technically used exergy and the loss allergy. The loss allergy is the exergy, which, although according to Carnot (theoretical), would still be usable, whose use does not make any sense, which is why it is lost with the waste heat.
Yes, I say.
under the link below you can see the chart I mean. In the dissipated heat flow, the anergy is once contained and then there is a loss yield and excess of the dissipated heat flow. I have not yet fully understood the difference between loss allergy and “uncut” excess of the dissipated heat flow.
The unused exergy is relatively understandable: if I discharge a heat flow of 60° C. in the condenser of a WKA, the difference to the ambient temperature is the unused exergy. Is the loss yield that I lose due to efficiency in the steam generator and turbine?