How does special radar equipment dissipate heat by water cooling?
As the key equipment of radar, transmitter has high power density and requires good heat dissipation effect. With the development of modern radar technology and the continuous progress of power device manufacturing technology, the assembly density and power density of radar transmitter are constantly improving. Large phased array radar T/R power components, airborne high-power transmitters, fourth-generation solid-state transmitters and spaceborne T/R components all put forward higher requirements for cooling. Feasible cooling method and excellent cooling effect have become more and more important support for the whole radar to have high reliability index.
Temperature is very important to the performance of radar system. If the temperature is too high or too low, it will lead to the failure of electronic components, and then make the whole radar equipment fail. In the high-power radar transmitter, the influence of temperature on the device performance is more prominent.
Water cooling is the use of liquid thermal conductivity and specific heat are relatively large, can greatly reduce the thermal resistance of the heat transfer links, with the liquid to take away the heat of the cooling method. Liquid cooling has high heat flux, uniform heat load, small temperature gradient and compact structure. Its disadvantages are: the system is more complex, larger volume and weight, high cost of equipment, maintenance is difficult.
Liquid cooling can be divided into direct liquid cooling and indirect liquid cooling. Direct liquid cooling can be divided into immersion direct liquid cooling and direct forced liquid cooling; Immersion direct liquid cooling is mainly used for high-power and high-voltage components in the transmitter, such as the klystron cathode, high-voltage transformer, inductor, silicon pile, etc. soaked in the cooling liquid, will be tropical away. Direct forced liquid cooling is widely used in high-power transmitters, such as klystron collection pole, tube body, output window, wire envelope, isolator and anode of orthogonal field tube, etc. In the microwave power module (MPM) abroad, in order to reduce the volume, weight and solve the heat dissipation problem of high heat density, direct forced liquid cooling is also used.
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