Low evaporating temperature absorption heat pump used for heating and domestic hot water in Northern China

To make use of low-grade and renewable energy, puts forward several heating and domestic hot water systems based on low evaporating temperature absorption heat pump (AHP). In the light of the problems of existing air source and ground source heat pumps, analyses the application potential of air-source and ground-source absorption heat pump used in Northern China. The results show that NH₃-LiNO₃ is more suitable for low evaporating temperature; single-stage air source absorption heat pump (ASAHP) has higher COP, while double-stage and double-stage coupling ASAHP are more advantageous when producing higher temperature hot water or operating in colder climate; and ground source absorption heat pump (GSAHP) can not only reduce the ground thermal imbalance but also provide high primary energy efficiency.