The invention relates to the technical field of the
heat exchanger of an air conditioner, which provides a
heat exchanger of an air conditioner with double rows of pipelines with a novel
refrigerant procedure. The
heat exchanger can enhance the efficiency of heat exchange simultaneously during
refrigeration and heating. The heat exchanger divides a
refrigerant into three paths to flow into the heat exchanger, all the three paths of refrigerants flow from the inner row of the heat exchanger and finally flow out from the outer row of the heat exchanger, a reversed U type
layout is adopted, and full-range countercurrent heat exchange is realized; the design of a three-path
refrigerant procedure considers the influence of gravity, adopts an unequal-range flow path and enhances the uniformity of the heat exchange of each path during
refrigeration, thereby enhancing the heat
exchange coefficient and the heat exchange quantity; and the invention adopts an unequal
diameter design for a convergence
pipe of the three paths, enhances the uniformity of the heat exchange of
refrigeration, also distributes the flow rate of the refrigerant for heating finely and enhances the heat
exchange coefficient and the heat exchange quantity of heating. The heat exchange efficiency of the heat exchanger is enhanced by about 10% in comparison with an original heat exchanger, and finally, the refrigeration energy efficiency (EER) and the
heating energy efficiency (COP) of the complete
machine are enhanced.