Вклад распределенного эффекта Пельтье в эффективность ветви термоэлектрического охладителя

An attempt is made to calculate the contribution of the distributed Peltier effect to the efficiency of the branch of the thermoelement Z for various types of impurity distribution. For this purpose, the boundary problem of thermal balance in the branch of the thermoelectric element was solved numerically, taking into account the distributed Peltier effect. The case of non-degenerate charge carriers was considered within the framework of the standard two-band model. The parameters of charge carriers were selected close to thermoelectrics based on bismuth and antimony tellurides. As the calculation in the framework of the two-zone model showed, the use of the distributed Peltier effect leads only to partial absorption of Joule heat, which contributes to an increase in the overall efficiency of the branch. In this case, the Z parameter along a significant part of the branch takes values significantly less than the maximum value

PWM controller for thermoelectric devices used in a climatization system

ABSTRACT The present work describes the development of an open loop temperature control system in a container through a Peltier Cell. The control consists of applying a PWM signal to the thermoelectric device, which controls the temperature in a range of 5 to 90 °C. A study was carried out to characterize the frequency and duty cycle of the PWM and thus determine the best operating conditions for the thermoelectric element. In addition, a power stage was implemented to change the supply polarity in the Peltier cell and, in this way, to be able to exchange the heating and cooling faces. The study carried out leaves the basis for implementing climatization system on a larger scale using thermoelectric elements in a novel and versatile way. RESUMEN El presente trabajo describe el desarrollo de un sistema de control de temperatura en lazo abierto en un contenedor mediante una célula Peltier. El control consiste en aplicar una señal PWM al dispositivo termoeléctrico, que controla la temperatura en un rango de 5 a 90 °C. Se realizó un estudio para caracterizar la frecuencia y el ciclo de trabajo del PWM y así determinar las mejores condiciones de funcionamiento del elemento termoeléctrico. Además, se implementó una etapa de potencia para cambiar la polaridad de alimentación en la célula Peltier y, de esta manera, poder intercambiar las caras de calentamiento y enfriamiento. El estudio realizado deja las bases para implementar el sistema de climatización a mayor escala utilizando elementos termoeléctricos de forma novedosa y versátil.

Study on the Development of Small Cooling Module System for Scrubber to Improve Toxic Gas Treatment Efficiency

Objectives : Manufacturing－based production facilities are required to install dust collection devices for air pollution prevention facilities. In particular, manufacturing-based companies need low-power hazardous gas treatment devices. However, due to the slowing economic growth, the cost of replacing new hazardous gas treatment devices is increasing, and new products in the form of parts that can be attached to scrubbers that are already installed are urgently needed.Methods : To deal with residual gas from organic and inorganic compounds used in semiconductor manufacturing processes, the concentration of air pollutants emitted through the process of removing harmful substances from the primary scrubber and re-treatment of gases emitted from the secondary scrubber is further lowered.Results and Discussion : In this study, a cooling block device which is a hazardous gas treatment part is developed to solve the limitation of scrubber processing capacity from overcapacity harmful gases such as strong toxicity, corrosivity, combustion, and environmental pollution in semiconductor manufacturing process.Conclusions : In the design factors and performance survey of cooling module using thermoelectric element, it was calculated that the cooling capacity of the peltier thermoelectric element with a margin of 9,300 W was required. Based on these results, the absolute humidity decreased by 5.8 g/kg and the temperature decreased by 9.5 degrees, showing the possibility of solving the problem of the decrease in the effectiveness of hazardous gas treatment of secondary scrubber due to increased moisture.

INFLUENCE OF THE CURRENT PULSE SHAPE ON THE DYNAMICS OF THE TEMPERATURE FIELD OF THE THERMOELECTRIC COOLER BRANCH

Numerical simulation of thermoelectric processes in a branch of a solid–state thermoelectric Peltier cooler in a non–stationary mode is performed. Some examples show the effect of changes in the amplitude of the current pulse over time on the temperature in the branch of the thermoelectric element.

Effect of Electroless Ni-P Plating on the Bonding Strength of PbTe Thermoelectric Module Using Silver Alloy-Based Brazing

This study investigates a brazing method for manufacturing PbTe thermoelectric modules using a Ag-based filler metal with a melting point of about 650 °C. To improve the bonding strength between the Ag-based brazing layer and the PbTe thermoelectric module, an electroless Ni-P plating layer is formed on the surface of the thermoelectric module as a diffusion barrier layer. The bonding strength of the PbTe thermoelectric module manufactured by the electroless Ni-P plating and Ag-based brazing has a high value of approximately 8.3 MPa. No defects such as pores or cracks were observed at the bonding interface between the thermoelectric element and the brazing layer. Furthermore, because of the high bonding strength of the manufactured thermoelectric module, fractures occur inside the thermoelectric element rather than at the bonding interface. Accordingly, the electroless Ni-P plating and Ag-based brazing method proposed in this study is found to be effective in manufacturing PbTe-based thermoelectric modules with high bonding strength.