Abstract
A model of the relationship between the reliability indices of two-stage TECs of various designs with the geometry of the branches of thermoelements in cascades in the ΔT max mode with electrical series of cascades (stages) is proposed and analyzed. Relations are obtained for determining the optimal geometry of the branches of thermoelements in cascades corresponding to the maximum temperature difference. The expression allows to estimate both the maximum cooling capacities and the reliability indices of two-stage thermoelectric cooling devices of various designs. The possibility of increasing the maximum temperature drop to 4 % is shown by choosing the optimal geometry of the branches of thermoelements in cascades (stages). This is achieved under the condition that the ratio of the length to the cross-sectional area of the elements of the first stage is greater than the ratio of the length to the cross-sectional area of the second stage, which differs from the traditional equality of these ratios for a given working current. The proposed approach makes it possible to estimate the maximum temperature drop and to predict the reliability indices of two-stage thermoelectric coolers of various designs for various operating conditions and to conduct an optimized design of radio electronic equipment using cascade thermoelectric cooling devices.
Highlights
Thermoelectric cooling devices are among the most promising devices for providing thermal regimes for radio electronic equipment
The disadvantage of thermoelectric coolers (TEC) is lower cooling capacity compared to compression cooling devices, which makes research relevant to increase their cooling capacity relevant
As follows from the approaches presented in the world periodicals, the main direction is the creation of new materials with higher values of thermoelectric efficiency and materials manufacturing technologies, which directly determines the cooling capacity of the thermoelectric device
Summary
Thermoelectric cooling devices are among the most promising devices for providing thermal regimes for radio electronic equipment. This is due to the lack of moving components, small dimensions, high speed, mechanical and impact strength. The disadvantage of thermoelectric coolers (TEC) is lower cooling capacity compared to compression cooling devices, which makes research relevant to increase their cooling capacity relevant. It is obvious that the main method of increasing the TEC cooling capacity is selection of the material of the thermoelements of the branches with the maximum value of thermoelectric efficiency. The choice of semiconductor materials for thermoelements for industrial applications is rather limited, with the existing technology and specified materials, constructive methods are needed to increase the cooling capacity of thermoelectric coolers
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