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Old Sep 25th 2014, 12:59 AM   #1
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Doubt about Available Energy or exergy .

sir I cant understand that As
available energy = 'Q1'[1-'T0'/'T1']
and efficiency = 1-'Q2'/'Q1'
so my question is doesn't increase of available energy i.e.
decrease of T0 will decrease the efficiency ?
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Old Sep 30th 2014, 05:12 PM   #2
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Hi Vibhav,

I'm not sure if i got your point but let me try.

The energy manifests itself in many forms, each with its own characteristics and its quality. Quality of energy is synonymous with its capacity to cause change.
To account for the variable quality of different disordered energy forms in the analysis of systems, a universal standard of quality is needed. The most natural and convenient standard is the maximum work which can be obtained from a given form energy using the environmental parameters as the reference state. This standard of energy quality is called exergy.

So, before write the equation you have to know what kind of parameters you are analysing. Are you trying to compute the available quantity of energy to to cause a specific change or standardize the disordered energy available in your system?
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