The invention discloses an
air conditioning system combined by an indirect
evaporation chiller plant and a traditional mechanical refrigerating unit. As for the
air conditioning system, a
surface heat exchanger, a water
ring type compression refrigerating unit and a blower are successively arranged in the casing of an air handling unit (AHU) from an air inlet to an air outlet; the discharging tube of the indirect
evaporation chiller plant is connected with the water inlet of the
surface heat exchanger of the AHU; and one
branch tube of a three-way connection of the discharging tube of the
surface heat exchanger is connected with the water inlet of the water
ring type compression refrigerating unit through a valve, the discharging tube of the water
ring type compression refrigerating unit is connected with the water inlet of the indirect
evaporation chiller plant, another
branch tube of the three-way connection is connected on a pipeline of the discharging tube of the water ring type compression refrigerating unit through a valve, and the air outlet of the blower is led to an
air conditioning room through a blast tube, wherein the pipeline of the discharging tube of the water ring type compression refrigerating unit is connected with the water inlet of the indirect evaporation chiller plant. The invention has the advantages that the applicable areas of evaporation refrigerating air conditioners is broadened, the air conditioning
system can be used both in dry and hot areas and in damp and hot areas, the refrigerating capability of dry air energy is fully utilized, step utilization of energy is realized, the installed capability of equipment is lowered, the electric load of equipment is reduced, the
fresh air requirement of the air conditioning system is increased and the
indoor air quality is improved.