Studying the influence of the thermoelectric materials parameters on the dynamics of single­cascade cooling devices

Zhuravlov³

2022

HAIT

A possibility of optimal thermal management of a number of temperature-dependent and heat-laden elements of radio electronic equipment with different power dissipation in an uneven temperature field using a set of thermoelectric cooling devices with mixed electrical connection and fixed geometry of thermocouple branches has been considered. Ratios for determining the relative operating current corresponding to the minimum supply voltage at a given thermal load for different temperature gradients and thermocouple branch geometries are derived. The possibility of selecting a supply voltage for a group of thermoelectric coolers with parallel electric connection using both analytical and graphical methods of solving a system of algebraic equations of first and second orders is shown. The basic parameters, reliability indices and dynamic characteristics of a thermoelectric cooler complex with mixed electrical connection when a group of thermoelectric coolers with series electrical connection operates at maximum cooling capacity and supply voltage variation of a group of coolers with parallel electrical connection are evaluated. Analysis of the research results showed the possibility of selecting the optimum supply voltage for a group of thermoelectric coolers with parallel electric connection in the interrelation of energy, mass-dimensional and dynamic characteristics, taking into account the reliability indicators of the complex as a whole. It is shown that by reducing the supply voltage of a group of thermoelectric coolers with parallel electric connection included in the complex, the energy, mass-size and dynamic characteristics are improved, and the reliability of the complex with mixed electric connection in an uneven temperature field is increased.

Section: Literary Reviewmentioning

confidence: 99%

Control of a thermoelectric cooling unit complex mixed electrical connection in an uneven temperature field

Zaykov¹,

Zhuravlov³

2022

HAIT

“…Conducted research in [14] showed the relationship of dynamic performance with the design of TEC, in [15] with the number of thermocouples, in [16] with the current modes of the product. In [17,18], an analysis of the possibility of controlling TECs by complex criteria, including both reliability and dynamics indices, is presented. However, all these studies were conducted for a separate thermoelectric cooler without taking into account their mutual influence.…”

Section: Literature Reviewmentioning

confidence: 99%

Control of complex thermoelectric cooling units with mixed electrical connection in a uniform temperature field

Zaykov¹,

Zhuravlov³

2022

AAIT

The possibility of optimal thermal management of a number of temperature-dependent and heat-loaded elements of radio electronic equipment with calculated power dissipation is considered. Studies have been carried out in a uniform temperature field using a set of thermoelectric cooling devices and defined geometry of thermocouple branches. The correlation for determining the relative operating current depending on the relative temperature drop for a given supply voltage, thermal load and geometry of thermoelements branches has been obtained; the range of valid values of the relative operating current has been determined. Acomparative analysis of the basic parameters, reliability indices and dynamic characteristics of a group of thermoelectric devices included in the complex for different supply voltages and heat loads has been made. The possibility of selecting supply voltages of thermoelectric devices complex with regard to limiting factors for mass-size, power, dynamic and reliability characteristics to ensure the optimum thermal mode of a number of thermo-dependent elements of radio electronic equipment has been shown. With increasing supply voltage of thermoelectric devices complex with mixed electrical connection in uniform temperature field at given thermal load and geometry of thermoelements branches the following results are achieved. Steady-state time increases, the number of thermoelements increases, the cooling coefficient decreases, the amount of consumed energy increases, the heat dissipation capacity of the heat sink increases, and the functional dependence of the probability of failure-free operation on the total supply voltage has a maximum.

“…These conditions refer to the most important performance indicators: reliability and dynamic characteristics, which always need to be increased and are in conflict [21,22], [23]. The problem is aggravated by the fact that when using a thermoelectric cooler in the feedback circuit of the control system, an increase in the dynamic characteristics of the cooler is required, which reduces its reliability [24]. In [25], a method is proposed for increasing the dynamic performance by choosing the material of thermoelements without deteriorating the other parameters of the device.…”

Section: Literature Reviewmentioning

confidence: 99%

Control of thermal regime of thermoelectric coolers inuniform temperature field

Zaykov¹,

Zhuravlov

2021

HAIT

The comparative analysis of means of control of a thermal mode at minimization of a complex of the basic parameters in various combinations with indicators of reliability and dynamics of functioning of one-stage thermoelectric cooler is resulted. The study was conducted for the operating range of temperature differences, standard heat load and different geometry of the branches of thermocouples. According to the results of research to minimize the sets of basic parameters in interaction with the indicators of reliability and dynamics of work, a number of current modes of operation have been developed. The developed mathematical models for the optimal operating current from the relative temperature difference and heat transfer of the radiator for the proposed operating modes are analyzed. The results of calculations of the main parameters, reliability indicators, and time of transition to stationary mode of operation for different current modes of operation in the range of temperature differences for different geometry of branches of thermoelements are given. The extremes of dependences of the cooling coefficient, heat dissipation capacity of the radiator, the amount of energy consumed on the relative operating current are determined, which is essential for the implementation of the control function. The possibility of choosing the current mode of operation for optimal control of the thermal regime of single-stage thermoelectric devices manufactured by the same technology, taking into account mass, size, energy, reliability and dynamic characteristics. The developed method of optimal regulation of the thermal regime of a single-stage thermoelectric cooler based on minimizing the set of basic parameters allows finding and choosing compromise solutions taking into account the importance of each of the limiting factors.