A theoretical model for analysis of single stage LiBr-H2O absorption heat pump was established and computer simulation for its thermodynamic cycle performance was conducted. The effects of varying operation conditions (circulation ratio
inlet temperature of low temperature waste water
inlet temperature of hot water and inlet temperature of high temperature vapor) on the four performance criteria (COP
entransy efficiency
exergy efficiency and entropy generation) are investigated
and the consistency of the four criteria are examined. It is found that the performance was degraded with the increases circulation ratio
inlet temperature of hot water and inlet temperature of high temperature vapor. Only when the inlet temperature of waste water increased
the performance was improved. It is also found that the variation trends of the four criteria with the operation conditions were different
and some were even opposite. To be specific
the increase of hot water inlet temperature worsens the system performance according to COP and entransy efficiency while improves the system performance according to exergy efficiency and entropy generation. However
the results obtained by the COP agree well with those by the entransy efficiency
indicating that the entransy efficiency is feasible for the heat pump performance analysis.