This study proposes a "one tower with three functions" solution for a dehumidification type frost-free air-source heat pump (ASHP) system

which can not only solve the frost problem of traditional ASHP systems in winter

but also improve the performance of the units in summer. The effects of air temperature

humidity

mass flow rate

solution temperature

and mass concentration were studied under dehumidification conditions. Additionally

solution mass concentration

the effect of solution temperature under regenerative conditions on the air exergy of the inlet and outlet

dehumidification/regenerative exergy

system input

output exergy

and exergy efficiency were studied by constructing the test bench. The results show that under dehumidification

there is an increase in the dehumidification exergy with an increase in the air temperature

air mass flow rate

and solution mass flow rate

and a decrease in the air humidity

solution temperature

and solution mass concentration. Additionally

there is an increase in the system exergy efficiency with an increase in the air temperature

humidity

air mass flow rate

mass flow rate and mass concentration of the solution

and a decrease in the solution temperature

air humidity and mass concentration of the solution. These have an insignificant effect on the exergy efficiency when the efficiency is up to 0.201. Under regenerative conditions

there is an increase in the regeneration exergy with an increase in the solution mass concentration and solution temperature. There is also an increase in the system exergy efficiency with an increase in the solution mass concentration

and a decrease in the solution temperature. The solution temperature has an insignificant effect on the exergy efficiency

when the efficiency is up to 0.1088. The efficiency of this system is higher than that of a conventional ASHP system under experimental conditions.