I designed LiBr/H2O single effect absorption refrigeration system using Aspen Plus. Energy analysis is OK. However, exergy destruction rate of solution expansion valve in absorption refrigeration system is negative. Do you know why it is ? Also, exergy destruction rate of pump is so large.
I have the same problem. I think the physical property parameters of LiBr aqueous solution in Aspen Plus are not accurate enough. You can try modeling absorption refrigeration cycles with EES.
However, researchers do exergy analysis of the absorption refrigeration system in ASpen plus.
hello.
because, in the states where the temperature and pressure are lower than the refrence temperature and pressure, the sum of physical and chemical properties will be negative. you should consider the mechanical and thermal exergys of these states to run true. at lost you can use EES to modeling this prob.
Good Luck.
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