Yury I. Shtern

Performance of Bi2Te3 Thermoelectric Element Improved by Means of Contact System Ni/Ta-W-N/Ni

In this paper the materials with improved thermoelectric properties developed based on Bi2Te3 were used for the production of thermoelectric generator. It allowed to extend the operating temperature range of the material to 550 K. Bi2.0Te2.4Se0.6 doped with 0.12 wt% CuBr (dimensionless coefficient ZT = 1.1 at a temperature of 450–550 K) was used as a material for manufacturing n-type branches. Bi0.4Sb1.6Te3.0 doped with 0.12 wt% PbCl2 and 1.5 wt% Te (dimensionless coefficient ZT = 1.2 at a temperature of 450–550 K) was used as a material for manufacturing p-type branches. The following materials were used as the contact system: 100 nm layer of nickel as the ohmic contact layer; 100 nm layer of amorphous alloy Ta-W-N as a diffusion barrier layer; and 400 nm layer of nickel as a wetting layer for soldering. Study of adhesion of this contact system demonstrated good quality. The breakout force was 12 MPa.

Electron Thermostating Elements for Controlling Consumption of Heat Transfer Agent in the Heating Systems

Electron thermostating elements (ETE) mounted on the regulating radiator valves are developed. ETE are designed for the automatic controlling of the consumption of heat transfer agent in the heating systems by a special program. So, ETE are intended for the controlling of the temperature in the heated placements. ETE have autonomous power supply. Optimization of the working algorithm of ETE in conjunction with the high efficiency of the servomotor, and low level of power consumption of the electronic circuit allowed authors to increase the time of autonomous work of ETE. Proposed design solutions of ETE can be used also in different fields of science and technology for the automatic controlling of the consumption of liquid and gaseous agents.

Investigation and Calibration Methods of Precise Temperature Sensors for Controlling Heat Consumption

Authors developed precise temperature sensor with wireless interface (WTS). Methods of thermocompensation and individual calibration of WTS were developed in order to provide high requirements of the temperature measurement accuracy (0.02 °C). Measuring hardware-software complexes for the realization of this methods and carrying investigations were also developed.