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.