Refrigerating system and refrigerating system for machine room

The invention provides a refrigerating system. The refrigerating system comprises a cold source die set for providing a cold source, a working die set for absorbing heat in a working area, and a heat exchanger for exchanging heat of the cold source die set and the working die set, wherein the heat exchanger comprises at least one heat exchange pipe which is divided by a separating structure into two parallel pipelines, namely, a first pipeline through which a first refrigerant passes and a second pipeline through which a second refrigerant passes. The refrigerating system further comprises a box body which is positioned at the outer side of the heat exchange pipe; an air blower is mounted on the box body; the air discharging direction of the air blower faces the wall of the heat exchange pipe. Compared with the design scheme of external dry cooler in the prior art, the refrigerating system has the advantages that the structure is simple, and the cost is small; the medium links are decreased, so that the heat transfer efficiency is increased, and the system energy consumption can be effectively decreased.