共查询到20条相似文献,搜索用时 62 毫秒
1.
《IEEE transactions on instrumentation and measurement》2009,58(1):99-107
2.
This study self-develops a novel type of photothermoelectric power generation modules. Dye-sensitized solar cells (DSSCs) serve as the photoelectric conversion system and a copper (Cu) heat-transfer nanofilm coating on both sides of the thermoelectric generator (TEG) acts as a thermoelectric conversion system. Thus module assembly absorbs light and generates electricity by DSSCs, and also recycles waste heat and generates power by the TEG. In addition, a set of pulsating heat pipes (PHP) filled with Cu nanofluid is placed on the cooling side to increase cooling effects and enhance the power generation efficiency. Results show that when the heat source of thermoelectric modules reaches 90 degrees C, TEG power output is increased by 85.7%. Besides, after thermoelectric modules are heated by additional heat source at 80 degrees C, the electrical energy generated by them can let a NiMH cell (1.25 V) be sufficiently charged in about 30 minutes. When photothermoelectric modules is illumined by simulated light, the temperature difference of two sides of TEG can reach 7 degrees C and the thermoelectric conversion efficiency is 2.17%. Furthermore, the power output of the thermoelectric modules is 11.48 mW/cm2, enhancing 1.4 % compared to merely using DSSCs module. 相似文献
3.
C.A. Gould N.Y.A. Shammas S. Grainger I. Taylor 《Materials Science and Engineering: B》2011,176(4):316-325
Thermoelectric cooling and micro-power generation from waste heat within a standard desktop computer has been demonstrated. A thermoelectric test system has been designed and constructed, with typical test results presented for thermoelectric cooling and micro-power generation when the computer is executing a number of different applications. A thermoelectric module, operating as a heat pump, can lower the operating temperature of the computer's microprocessor and graphics processor to temperatures below ambient conditions. A small amount of electrical power, typically in the micro-watt or milli-watt range, can be generated by a thermoelectric module attached to the outside of the computer's standard heat sink assembly, when a secondary heat sink is attached to the other side of the thermoelectric module. Maximum electrical power can be generated by the thermoelectric module when a water cooled heat sink is used as the secondary heat sink, as this produces the greatest temperature difference between both sides of the module. 相似文献
4.
《低温学》2003,43(10-11):571-574
This paper describes experimental results of a high Tc superconducting magnet excited by a thermoelectromotive force. This magnet system has an advantage of simple configuration because a thermoelectric element is much smaller than a conventional external power source for a superconducting magnet. It is demonstrated that more than 50 A of transport current is obtained in the present experiment. The heat leakage to the coil is about double amount as compared with a conventional magnet system with an external power source. 相似文献
5.
Yanqiu Li Hongyun Yu Bo Su Yonghong Shang 《IEEE sensors journal》2008,8(6):678-681
Wireless sensor networks have become a very significant enabling technology in many applications and the use of environmental energy is a feasible source for low-power wireless sensor networks. The challenges of developing a power supply including generation or conversion, storage, and power management are manifold to extend the lifetime of a wireless sensor network. The objective of this research is to develop an intelligent hybrid power system to realize a self-sustaining wireless sensor node. The photovoltaic and thermoelectric generators are adopted as energy converters. The lithium ion battery and ultracapacitor are used as reservoirs. An intelligent power management system has been developed to control the power distribution. The design data and experimental results show that the hybrid micropower source can extend the lifetime of a sensor network. 相似文献
6.
A system design method of thermoelectric cooler is developed in the present study. The design calculation utilizes the performance curve of the thermoelectric module that is determined experimentally. An automatic test apparatus was designed and built to illustrate the testing. The performance test results of the module are used to determine the physical properties and derive an empirical relation for the performance of thermoelectric module. These results are then used in the system analysis of a thermoelectric cooler using a thermal network model. The thermal resistance of heat sink is chosen as one of the key parameters in the design of a thermoelectric cooler. The system simulation shows that there exists a cheapest heat sink for the design of a thermoelectric cooler. It is also shown that the system simulation coincides with experimental data of a thermoelectric cooler using an air-cooled heat sink with thermal resistance 0.2515°C/W. An optimal design of thermoelectric cooler at the conditions of optimal COP is also studied. The optimal design can be made either on the basis of the maximum value of the optimal cooling capacity, or on the basis of the best heat sink technology available. 相似文献
7.
8.
This work presents a biomedical microsystem with a wireless radiofrequency (RF)-powered electronics and versatile sensors/actuators for use in nanomedicinal diagnosis and therapy. The cooling of brain tissue has the potential to reduce the frequency and severity of epilepsy. Miniaturised spiral coils as a wireless power module with low-dropout linear regulator circuit convert RF signals into a DC voltage, can be implanted without a battery in monitoring free behaviour. A thermoelectric (TE) cooler is an actuator that is employed to cool down brain tissue to suppress epilepsy. Electroencephalogram (EEG) electrodes and TE coolers are integrated to form module that is placed inside the head of a rat and fastened with a bio-compatible material. EEG signals are used to identify waveforms associated with epilepsy and are measured using readout circuits. The wireless part of the presented design achieves a low quiescent current and line/load regulation and high antenna/current efficiency with thermal protection to avoid damage to the implanted tissue. Epilepsy is suppressed by reducing the temperature to reduce the duration of this epileptic episode. Related characterisations demonstrate that the proposed design can be adopted in an effective nanomedicine microsystem. 相似文献
9.
Solar cells are the most commonly used devices in customer products to achieve power autonomy. This paper discusses a complementary approach to provide power autonomy to devices on a human body, i.e., thermoelectric conversion of human heat. In indoor applications, thermoelectric converters on the skin can provide more power per square centimeter than solar cells, particularly in adverse illumination conditions. Moreover, they work day and night. The first sensor nodes powered by human heat have been demonstrated and tested on people in 2004-2005. They used the state-of-the-art 100-muW watch-size thermoelectric wrist generators fabricated at IMEC and based on custom-design small-size BiTe thermopiles. The sensor node is completed with a power conditioning module, a microcontroller, and a wireless transceiver mounted on a watchstrap 相似文献
10.
Cheng-Yung Chiang Huey-Ru Chuang 《IEEE transactions on instrumentation and measurement》1997,46(5):1150-1155
Conventional load-pull methods for RF power transistor large-signal measurements usually need complicated RF measurement instrumentation. A simple load-pull measurement setup and a test procedure with IEEE-488 GPIB control and data acquisition capability has been developed. This is used to facilitate the design of an RF power amplifier (PA) for wireless communication applications. Compared with the conventional load-pull method, it is simpler and less costly, yet effective. Measured examples of Siemens GaAs FET's CLY-2 and CLY-10, which are used to design a RF PA module for ISM-band (902-928 MHz) wireless communications, are presented 相似文献
11.
A. I. Novikov 《Journal of Engineering Physics and Thermophysics》2001,74(1):224-229
A refined model for calculation of the heat transfer inside a thermoelectric temperature transducer of the module type is considered as applied to the structure of a solar thermoelectric battery. An investigation is made of the dependence of the useful electric power of the battery on the geometric characteristics of its thermomodules and the structural parameters of the battery. It is shown that for each value of the external load optimum values of the crosssectional area and height of the thermoelement arms exist, at which the maximum useful electric power is realized. 相似文献
12.
13.
建立了以水为热交换媒介的太阳能光伏半导体制冷模块实验系统.制冷装置模块化,用以适应制冷功率变化较大的不同空间布局,通过太阳能光电半导体制冷实验获得了不同工作状态下电流、制冷量、制冷系数等重要参数,该参数可为确定系统最佳工作区域提供可靠依据.给出了太阳能热电制冷系统组合方案,介绍了一种新型组合式半导体制冷器和半导体热电发电装置,其数值计算的结构参数、最大制冷系数和制冷率等重要参数以及热电器件最佳工作区域和结构参数的最优范围,可为系统优化设计的配置提供理论上的指导. 相似文献
14.
15.
A Fabry-Perot fiber optic temperature sensing system is presented in this paper. It uses a Fabry-Perot interferometer (FPI) to transform the environmental temperature into modulated reflected light. This light is directed to a patented light cross-correlator that locates the position of the maximum interference fringe intensity, which is detected by a linear CCD array. Therefore, the actual observed data is the position of the CCD pixel detecting the maximum interference fringe intensity rather than the light intensity itself. Consequently, this sensing mechanism is tolerant to the loss of light power that may result from external effects. Based on an analysis of the entire sensing system, a theoretical dynamic model was developed, which shows that the system dynamic response depends on the heat transfer process in the sensor head and the signal processing in the signal conditioner. An experimental method was developed to validate the theoretical model. Two empirical dynamic models are also obtained from the experimental data. Comparing the theoretical model with the empirical models, the poles result from the heat transfer process in the sensor head 相似文献
16.
Svetozár Malinarič 《International Journal of Thermophysics》2013,34(10):1953-1961
The transient plane source method of measuring the thermal conductivity and thermal diffusivity uses a sensor in the shape of a thin disk, which simultaneously serves as the heat source and thermometer. This study describes improvements of the experimental apparatus, providing some details of the electrical bridge with the aim to obtain maximum reliability of the measurement results. The aim of the temperature function analysis is to find the optimal time of measurement. The relation between the data time window used for fitting, the uncertainty of the sensor temperature measurement, and the uncertainty of the results is presented and graphically illustrated using numerical simulation of the experiment. The theory was confirmed by the evaluation of real measurements on polymethylmetacrylate. The temperature function analysis revealed that a decrease of the temperature measurement uncertainty need not always lead to a fall in the total uncertainty of the results but to shorter experiments and smaller specimens. 相似文献
17.
18.
Wenduo Liu van Wyk J.D. Bing Lu 《IEEE transactions on instrumentation and measurement》2008,57(7):1394-1402
This paper presents a practical approach to accurately measure the in-circuit power loss of an integrated power electronics module. Based on several reasonable assumptions, the heat flux out of the module is related to the temperature drop across the thermal resistance material in the heat dissipation path. By performing a calibration experiment, the total dissipated heat can be identified. The experimental results prove the high accuracy of this measurement method. This measurement method can be extended to other situations when the assumptions that are applicable to this experiment are satisfied. 相似文献
19.
半导体光纤温度传感器特性研究 总被引:5,自引:0,他引:5
设计了一种新颖的半导体光纤温度的传感器。通过实验的方法研究了采用不同光源时传感器的输出特性。根据实验数据了分析了传感器的灵敏度、测量范围、线性度和重复性与光源光谱性之间的关系。实验结果表明用该光纤温度传感系统可以实现对温度的非接触稳定测量。 相似文献