The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Ming-chyuan Lin - One of the best experts on this subject based on the ideXlab platform.

  • Thermal and thermal stress analysis of a thin-film thermoelectric cooler under the influence of the Thomson effect
    Sensors and Actuators A: Physical, 2006
    Co-Authors: Mei-jiau Huang, Po-kuei Chou, Ming-chyuan Lin
    Abstract:

    Abstract This work has two parts. The first part details the thermal analysis of a thin-film thermoelectric cooler under the influence of the Thomson heating, the Joule heating, and the Fourier's heat conduction. A constant Thomson coefficient, instead of traditionally a constant Seebeck coefficient, is assumed. The influence of the Thomson effect on the cooling power, the achievable temperature difference and the optimum operating current density is then explored. It is found that the Joule's heat and the conduction heat flowing to the Cold Junction can be significantly reduced if thermoelectric materials with properly designed Thomson coefficients are employed. A modified thermal conductance and a modified electric resistance are resulted. The second part of this paper details the analysis of the thermal stresses existing in the layered structure and induced by the temperature difference via a non-coupled thermal elastic theory. The results provide a preliminary knowledge to judge whether the thin-film structure is destroyed by the thermal stresses or not, especially by the shear stresses between adjacent layers.

Paul Muralt - One of the best experts on this subject based on the ideXlab platform.

  • A concept of wireless and passive very-high temperature sensor
    Applied Physics Letters, 2017
    Co-Authors: Pascal Nicolay, Alessandro Mazzalai, Jochen Bardong, Rami Matloub, Paul Muralt
    Abstract:

    There is a need for sensors capable operating at temperatures above 1000 °C. We describe an innovative sensor that might achieve this goal. The sensor comprises two main elements: a thermocouple and a surface acoustic wave (SAW) strain sensor. The Cold Junction of the thermocouple is electrically connected to a highly piezoelectric thin layer, deposited on top of a SAW substrate. In operation, the voltage generated by the temperature gradient between the hot (>1000 °C) and Cold Junction (

Mei-jiau Huang - One of the best experts on this subject based on the ideXlab platform.

  • Thermal and thermal stress analysis of a thin-film thermoelectric cooler under the influence of the Thomson effect
    Sensors and Actuators A: Physical, 2006
    Co-Authors: Mei-jiau Huang, Po-kuei Chou, Ming-chyuan Lin
    Abstract:

    Abstract This work has two parts. The first part details the thermal analysis of a thin-film thermoelectric cooler under the influence of the Thomson heating, the Joule heating, and the Fourier's heat conduction. A constant Thomson coefficient, instead of traditionally a constant Seebeck coefficient, is assumed. The influence of the Thomson effect on the cooling power, the achievable temperature difference and the optimum operating current density is then explored. It is found that the Joule's heat and the conduction heat flowing to the Cold Junction can be significantly reduced if thermoelectric materials with properly designed Thomson coefficients are employed. A modified thermal conductance and a modified electric resistance are resulted. The second part of this paper details the analysis of the thermal stresses existing in the layered structure and induced by the temperature difference via a non-coupled thermal elastic theory. The results provide a preliminary knowledge to judge whether the thin-film structure is destroyed by the thermal stresses or not, especially by the shear stresses between adjacent layers.

Zhuo-zhi Yan - One of the best experts on this subject based on the ideXlab platform.

  • Thermocouple Cold End Compensation System with Programmable Function
    DEStech Transactions on Computer Science and Engineering, 2017
    Co-Authors: Ying-li Wang, Zhuo-zhi Yan
    Abstract:

    The thermocouple is the most commonly temperature sensor used in the measurement technique. But because of the fluctuation of the ambient temperature, the Cold temperature is difficult to hold invariableness. This paper proposes an improved method. There are all kinds of thermocouple compensation tables in the system. And according to the actual need, we can select the corresponding table to make the Cold Junction compensation. This system meets the needs of various types of thermocouples.

  • Programmable Thermocouple Transmitter with Compensation Function
    Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016), 2016
    Co-Authors: Ying-li Wang, Jian Wang, Zhuo-zhi Yan
    Abstract:

    On the basis of discussing Cold Junction compensation of thermocouple measurement, an improving solution was provided which was based on the stm32 with the programmable the rmocouple transmitter with compensation function. T hermo emf is sent to the MCU of the host computer after A/D conversion, and then a digital compensative algorithm realized through compensative algorithm in the MCU. Tests show that the system is accuracy and stable.

G.f. Jones - One of the best experts on this subject based on the ideXlab platform.

  • Cold Junction Plate Optimization for the Nighttime Solar Cell TM
    1st International Energy Conversion Engineering Conference (IECEC), 2003
    Co-Authors: Ronald J. Parise, G.f. Jones
    Abstract:

    The primary objective of the Nighttime Solar Cell ™ is to produce electric power at night. The cell can be used to complement daytime photovoltaic electrical energy production, or as a stan d-alone device can produce electrical power both night and day in low wattage applications. The Nighttime Solar Cell ™ op erates with a thermoelectric generator (TEG) utilizing the ambient or its surroundings as the source of thermal energy while deep spac e provides a thermal sink. The Cold Junctions of the TEG are insulated from the surroundings with a vacuum to improve overall effec tiveness. The Cold Junction Plate (CJP) inside the cell links the TEG's Cold Junctions to the thermal sink, acting as a he at spreader (HTS) to increase the heat flux from the device. The thermal model describing the operation of the cell has been enhanced to inves tigate different configurations for the HTS. For this application, the HTS utilizes radiation heat transfer to reject the waste heat to the thermal sink. A simple one dimensional model is used to investigate the effect of the HTS geometry on the cell. Typically used in high power electronic heat dissipation, here the HTS allows for a greater influence by the ther mal sink to increase cell output. Data for two -dimensional, radiatively cooled HTSs is presented, comparing cylindrical and rectangular geometries. The TEG module is modelled as a heat source in the center of the HTS. The results show that for typical N ighttime Solar Cell ™ thermal systems, square TEG modules can be modeled as cylindrical to match round heat spreaders with little loss of accuracy. The analysis also shows that the HTS thickness is favorable for using copper CJPs to increase the heat trans fer to deep space while reducing the mechanical stress on the TEGs. Also, projected performance of a prototype cell currently being built illustrates the effectiveness of high Junction density modules for future cell development.

  • Energy from deep space the Nighttime Solar Cell/sup TM/ electrical energy production
    Collection of Technical Papers. 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC) (Cat. No.00CH37022), 1
    Co-Authors: R.j. Parise, G.f. Jones
    Abstract:

    The primary objective of the Nighttime Solar Cell/sup TM/ is to produce electric power at night. The lack of energy production when there is no incident solar energy is a major drawback to photovoltaic cells. Nighttime utilization of the new device produces electrical energy using a thermoelectric generator (TEG) operating in the temperature differential that exists between deep space at an effective temperature of 4 K and the surrounding ambient temperature (nominally at 300 K). Thus the ambient or surroundings of the device are the source of thermal energy while deep space provides a thermal sink. The Cold Junction of the TEG is insulated from the surroundings by a vacuum cell, improving its overall effectiveness. This research is an on-going effort to develop a clean, reliable, safe, inexpensive, alternate source of electric power using deep space. The model discussed herein investigates the many design parameters that influence electrical power production including semiconductor configuration, Cold Junction plate area and depth of vacuum required in the cell for acceptable performance.