Broad use base and number of users both in industry and academia

Friendly, prompt and professional support

Continuously developed in cooperation with leading institutes


Home Forums Asimptote knowledge forum Negative Exergy destruction values

Viewing 2 reply threads
  • Author
    • #1771

      I sometimes find that for a Sink/Source, which is a source of a fluid, the exergy loss (exergy destroyed) is negative. Is it because there is no inlet stream of fluid into the Sink/Source?

    • #1772

      Dear Sreekanth, if could upload a specific, simple, example of such a case, that would be helpful.

      • #1773

        In the attachment, sink/sources 2, 3 and 7 have negative exergy losses. Does it imply exergy generation?

    • #1816

      If you make the air composition exactly like the Baehr environment conditions (it differs from the standard air composition and p = 1.01325 bar in your case) then you can see that the exergy flow in source 1 is only 0.01 kW, which may be a round-off error, as it should be 0 kW. In sink/source 2 the temperature is increased by 5 K. As a consequence the exergy flow to the system is 0.04 kW.

      In source 7 the pressure and temperature of the flue gasses are 2 bar and 250 C and the composition differs from the environment composition, which introduces both a thermo-mechanic and chemical exergy flow to the system.

      You must be logged in to view attached files.
Viewing 2 reply threads
  • You must be logged in to reply to this topic.