The thermodynamic performance of an absorption system using [bmim]Zn2Cl5/NH3 as working pair for cooling and heating applications was numerically analyzed. Changes in the coefficient of performance (COP) and exergetic efficiency for [bmim]Zn2Cl5/NH3 absorption refrigeration with varying generation temperature, absorption temperature and condensation temperature were simulated and compared with that of the NaSCN/NH3 system. It was observed that the COP and exergetic efficiency of the [bmim]Zn2Cl5/NH3 system are slightly higher than that of the NaSCN/NH3 system when the generation temperature is high and the condensing temperature and absorption temperature are low. The effects of the generation temperature on the COP and the circulation ratio for cooling were investigated and analyzed. The results indicate that the [bmim]Zn2Cl5/NH3 system is suitable for use in cooling applications. The effects of the generation temperature on the COP, exergy efficiency and circulation ratio for heating were evaluated and discussed. The findings indicate that the [bmim]Zn2Cl5/NH3 absorption system exhibits good thermal performance for heating applications. (c) 2014 Elsevier Ltd. All rights reserved.