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Keywords
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absorption heat transformer, advanced exergy analysis, endogenous ,
exogenous, avoidable and unavoidable
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Abstract
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Abstract: Conventional and advanced exergy analyses are applied for a double absorption heat
transformer system utilizing low-grade industrial waste heat for water purification. The
conventional method provides information about the location and magnitude of
inefficiencies and does not consider any interaction among components regarding the
irreversibility occurring in them. The advanced exergy technique however, exposes the
real origins of irreversibilities and latent potential for enhancement of each system
component, along with reflecting mutual interaction between components. The
simulation of the cycle is carried out with engineering equation solver software. The
results show that the overall improvement potential of the cycle is only 16%. Also, the
mutual interdependency between components is found to be weak as 97% of the total
exergy destruction appeared as endogenous. Furthermore, considering endogenous
avoidable exergy destruction, the improvement strategy of components obtained by
advanced exergy method is disparate from conventional one. Results of the advanced
exergy suggest this order: condenser, absorber, evaporator, absorber/evaporator
assembly, generator assembly, economizer 1, and economizer 2. Additionally, a
parametric investigation is performed to assess the sensitivity of splitting exergy
destruction to the variation of heat source temperature for highlighting improvement
oppor
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