Method of indirect evaporative cooling of air and device for implementation thereof

An indirect evaporative cooling method, comprising:

• formation of a common air flow prior to entering a heat exchanger,
• formation of a main and a process flows,
• controlling cooling capacity of a cooled air from the indirect evaporative cooling device, and differs in that
• the common air flow is separating into main and additional ones with possibility of their throughout capacity adjustment, wherein the main flow is supplied to the heat exchanger and the additional flow is supplied to a bypass channel, then the main flow in the heat exchanger is divided into a forward and a reverse flows, values of hydraulic resistances of the main and the additional flows are selected equal, the additional and the main flows are mixed at an outlet of the heat exchanger, forming a cooled flow at the outlet of the indirect evaporative cooling device, wherein absolute values of the process flow and the cooled flow at the outlet of the device are maintained unchanged.