scholarly journals Method for increasing the dynamic characteristics of thermoelectric coolers

2021 ◽  
Vol 4 (4) ◽  
pp. 354-367
Author(s):  
Yurii I. Zhuravlov
Keyword(s):  
Dynamic Characteristics ◽  
Thermoelectric Materials ◽  
Operating Mode ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Limiting Factors ◽  
Maximum Temperature ◽  
Thermoelectric Cooler ◽  
Modes Of Operation ◽  
Thermoelectric Coolers

The influence of the efficiency of the initial thermoelectric materials on the dynamics of the functioning of the thermoelectric cooling device for various characteristic current modes of operation in the range of operating temperature drops and heat load at a given geometry of thermoelement legs is considered. The parameters of thermoelectric materials of thermoelements are conventionally divided into three groups: used for batch production, laboratory research and maximum values. The criterion for choosing the operating mode of the thermoelectric cooler takes into account the mutual influence and weight of each of the limiting factors. Since the design conditions can be very diverse, simultaneously varying several limiting factors (constructive, energy and reliability), you can choose the most rational mode of operation. The analysis was carried out for typical current modes of operation of thermoelectric coolers: maximum cooling capacity, maximum cooling capacity at a given current, maximum coefficient of performance, minimum failure rate. It is shown that with an increase in the efficiency of the initial thermoelectric materials, the time for reaching the stationary operating mode of the thermoelectric cooler, the required number of thermoelements, and the maximum temperature difference increase. A method is proposed for reducing the time constant of thermoelectric coolers due to the revealed relationship between the efficiency of thermoelectric materials and the dynamic characteristics of thermoelements. It is shown that an increase in the dynamic characteristics of thermoelectric coolers is achieved without changing the design documentation, manufacturing technology and additional climatic and mechanical testing of products.

scholarly journals Performance investigation of a two-stage thermoelectric cooler with inhomogeneous materials

2021 ◽  
pp. 254-254
Author(s):  
Yuewu Huang ◽  
Jingjing Zha ◽  
Hui Ding
Keyword(s):  
Thermal Conductivity ◽  
Cooling Capacity ◽  
Exergy Efficiency ◽  
Coefficient Of Performance ◽  
Thermoelectric Cooler ◽  
Inhomogeneous Materials ◽  
Two Stage ◽  
Optimal Operating ◽  
Thermoelectric Coolers ◽  
Capacity Coefficient

A novel model of two-stage thermoelectric cooler with inhomogeneous thermal conductivity in steady-state operating condition is established. The modification of the constant properties model allows controlling the distribution of Joule heat. Considering internal irreversibilities of the thermoelectric cooler, expressions for the cooling capacity, coefficient of performance and exergy efficiency are derived. By utilizing numerical methods, the temperature profile along the thermoelectric legs is presented. The optimal operating regions are explored. The coefficient of performance versus cooling capacity describing optimal operating regions in inhomogeneity materials are plotted. Mean while, the influence of the main parameters such as the variation of thermal conductivity distribution, cold-end temperature and the number of thermoelectric modules on the cooling performance is discussed in detail. Results indicate that the cooling capacity, coefficient of performance and exergy efficiency are improved compared to those of homogeneous two-stage thermoelectric coolers when an appropriate inhomogeneous property parameter is applied. The work can provide guidance on design of actual two stage thermoelectric coolers with inhomogeneous materials.

Performance Testing of a Thermoelectric Cooler for Medical Application

2011 ◽  
Vol 255-260 ◽  
pp. 1537-1540
Author(s):  
Fu Jen Wang ◽  
Jung Chieh Chang ◽  
Kuo Chien Lin ◽  
Yat Huang Yau
Keyword(s):  
Heat Transfer ◽  
Performance Testing ◽  
Experimental Tests ◽  
Medical Application ◽  
Cooling Capacity ◽  
Cold Chain ◽  
Heat Transfer Analysis ◽  
Thermoelectric Cooler ◽  
Open Market ◽  
Thermoelectric Coolers

Thermoelectric cooler has the advantage of being portable, simple, compact, noiseless, reliable, and environmentally benign. It is quite suitable for transporting and storage for bio-medical products (such as vaccine and blood) which are very sensitive to temperature variation. However, the coefficient of performances (COP) and the cooling capacity of the thermoelectric coolers available in the open market are relatively low. In this study, the effort will be focused on the design of the heat transfer aspect for a thermoelectric blood cooler specific for bio-medical application. Optimized thickness at 0.0025m of a plate fin with length at 0.598m could be obtained through heat transfer analysis. Performance tests have been conducted to investigate the influence of cabinet temperature in the thermoelectric blood cooler. Experimental tests revealed the optimized plate fin can provide satisfactory cooling performance, and to cool down the cabinet until 2°C within 40 minutes. Some tests including different voltage input, loading condition and ambient temperature tests for blood storage have been conducted as well to validate the quality of blood cold chain storage. It is expected that the developed thermoelectric cooler for blood cold chain system will perform stable cold storage and precise temperature control specific for medical application.

scholarly journals An IoT-Based Thermoelectric Air Management Framework for Smart Building Applications: A Case Study for Tropical Climate

2020 ◽  
Vol 12 (4) ◽  
pp. 1564
Author(s):  
Kashif Irshad ◽  
Abdulmohsen Almalawi ◽  
Asif Irshad Khan ◽  
Md Mottahir Alam ◽  
Md. Hasan Zahir ◽  
...  
Keyword(s):  
Cooling Capacity ◽  
Input Power ◽  
Climatic Conditions ◽  
Coefficient Of Performance ◽  
Air Cooling ◽  
Thermoelectric Coolers ◽  
Air Conditioners ◽  
Management Framework ◽  
Smart Building ◽  
Thermal Management System

This study investigates the performance of the thermoelectric air conditioning (TE-AC) system smartly controlled by the Internet of Things (IoT)-based configuration for real tropical climatic application. Air cooling management was done through thermoelectric coolers, and an Arduino microcontroller with various sensors such as a temperature sensor, simple RF modules, and actuators was used to control the indoor climatic conditions based on outdoor conditions. The result shows that when the input power supply to the IoT-based TE-AC system is increased, the cooling capacity of the framework is also enhanced. Significant power and carbon emission reduction was observed for the IoT-based TE-AC system as compared to the TE-AC system without IoT. The IoT-incorporated system also ensures better microclimatic temperature control. Additionally, the system cooling capacity improves by 14.0%, and the coefficient of performance is increased by 46.3%. Thus, this study provides a smart solution to the two major energy harvesting issues of traditional air conditioners—an increase in energy efficiency by employing a TE-AC system and a further improvement in efficiency by using an IoT-based thermal management system.

THERMAL CONTROL OF THERMOELECTRIC COOLING DEVICES OF TRANSMISSION AND RECEIVING ELEMENTS OF ON-BOARD INFORMATION SYSTEMS

2020 ◽  
Vol 3 (4) ◽  
pp. 263-278
Author(s):  
Vladimir Ivanovich Mescheryakov ◽  
Vladimir Petrovich Zaykov ◽  
Yurii Ivanovich Zhuravlov
Keyword(s):  
Dynamic Model ◽  
Dynamic Characteristics ◽  
Heat Sink ◽  
Operating Mode ◽  
Stationary Mode ◽  
Thermoelectric Cooler ◽  
Operating Modes ◽  
Reliability Indicators ◽  
Sink Capacity ◽  
Current Operating

The work is a continuation of studies of the dynamic characteristics of thermoelectric coolers aimed at analyzing the influence of temperature differences, current operating modes, design parameters of the device and physical parameters of the material of thermoelements for a time constant. The article analyzes the effect of the heat sink capacity of the radiator on the dynamic characteristics, energy and reliability indicators of a single-stage thermoelectric cooler. A dynamic model of a thermoelectric cooler has been developed taking into account the weight and size parameters of the radiator, which relate the main energy indicators of the cooler with the heat removal capacity of the radiator, operating currents, the value of the heat load and the relative temperature difference. The analysis of the dynamic model shows that with an increase in the heat-removing capacity of the radiator at a given thermal load and various current modes, the main parameters of the cooler change. The required number of thermoelements, power consumption, time to reach a stationary mode, and relative failure rate are reduced. With an increase in the relative operating current, the time to reach the stationary mode of operation decreases for different values of the heat sink capacity of the radiator. It is shown that the minimum time to reach the stationary operating mode is provided in the maximum refrigerating capacity mode. The studies were carried out at different values of the heat sink capacity of the radiator in the operating range of temperature drops and the geometry of thermoelements. The possibility of minimizing the heat-dissipating surface of the radiator at various current operating modes and the relationship with the main parameters, reliability indicators and the time to reach the stationary operating mode are shown. Comparative analysis of weight and size characteristics, main parameters, reliability indicators and dynamics of functioning with rational design makes it possible to choose compromise solutions, taking into account the weight of each of the limiting factors.

scholarly journals Гибридные режимы работы термоэлектрических модулей

2022 ◽  
Vol 56 (1) ◽  
pp. 13
Author(s):  
И.А. Драбкин ◽  
Л.Б. Ершова
Keyword(s):  
Cooling Capacity ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Large Temperature ◽  
Hybrid Mode ◽  
Cooling Mode ◽  
Thermoelectric Coolers ◽  
General Cooling ◽  
Maximum Coefficient

It is suggested that thermoelectric coolers designing should not be limited to the extreme modes of their operation. In some cases, it is convenient to use the so called hybrid modes - a combination of the extreme mode of maximum coefficient of performance for large temperature differences and a general cooling mode for small ones. The proposed hybrid mode makes it possible to control the cooling capacity of the module and not to confine this value to that under the extreme operating conditions, the maximum coefficient of performance in particular.

Thermodynamic Analysis of Thermoelectric Coolers

1998 ◽  
Vol 26 (3) ◽  
pp. 201-209
Author(s):  
Mamdouh El Haj Assad
Keyword(s):  
Cooling Rate ◽  
Thermodynamic Analysis ◽  
Finite Time ◽  
Rate Increase ◽  
Heat Engine ◽  
Coefficient Of Performance ◽  
Thermoelectric Cooler ◽  
Temperature Ratio ◽  
Thermoelectric Coolers ◽  
Dimensionless Parameters

A thermodynamic analysis of a thermoelectric cooler is proposed. The coefficient of performance of the cooler is expressed in terms of two dimensionless parameters which are to be optimized. The thermoelectric cooler is considered as an irreversible Carnot-like reversed heat engine. The effect of the external irreversibilities on the coefficient of performance and cooling rate is investigated by the use of finite-time thermodynamic analysis. The coefficient of performance and cooling rate increase with an increase in the temperature ratio defined in the analysis.

Thermodynamic Analysis of TEG-TEC Device Including Influence of Thomson Effect

2018 ◽  
Vol 43 (1) ◽  
pp. 75-86 ◽  
Author(s):  
Yuanli Feng ◽  
Lingen Chen ◽  
Fankai Meng ◽  
Fengrui Sun
Keyword(s):  
Thermoelectric Generator ◽  
Cooling Capacity ◽  
Thermodynamic Theory ◽  
Optimal Performance ◽  
Coefficient Of Performance ◽  
Junction Temperature ◽  
Thermoelectric Cooler ◽  
Thomson Effect ◽  
Equilibrium Thermodynamic ◽  
Cold Junction

AbstractA thermodynamic model of a thermoelectric cooler driven by thermoelectric generator (TEG-TEC) device is established considering Thomson effect. The performance is analyzed and optimized using numerical calculation based on non-equilibrium thermodynamic theory. The influence characteristics of Thomson effect on the optimal performance and variable selection are investigated by comparing the condition with and without Thomson effect. The results show that Thomson effect degrades the performance of TEG-TEC device, it decreases the cooling capacity by 27 %, decreases the coefficient of performance (COP) by 19 %, decreases the maximum cooling temperature difference by 11 % when the ratio of thermoelectric elements number is 0.6, the cold junction temperature of thermoelectric cooler (TEC) is 285 K and the hot junction temperature of thermoelectric generator (TEG) is 450 K. Thomson effect degrades the optimal performance of TEG-TEC device, it decreases the maximum cooling capacity by 28 % and decreases the maximum COP by 28 % under the same junction temperatures. Thomson effect narrows the optimal variable range and optimal working range. In the design of the devices, limited-number thermoelectric elements should be more allocated appropriately to TEG when consider Thomson effect. The results may provide some guidelines for the design of TEG-TEC devices.

scholarly journals EFFECTIVENESS OF SOLAR THERMOELECTRIC COOLER FOR FISH PRESERVATION: EXPERIMENTAL STUDY ON QUALITY CHARACTERISTICS OF Pangasius bocourti FISH FILLETS DURING STORAGE

2021 ◽  
Vol 9 (5) ◽  
pp. 618-629
Author(s):  
Olipriya Biswas ◽  
◽  
Palani Kandasamy ◽  
Goutam Mandal ◽  
Debasis Panda ◽  
...  
Keyword(s):  
Cooling System ◽  
Thiobarbituric Acid ◽  
Cooling Capacity ◽  
Quality Parameters ◽  
Coefficient Of Performance ◽  
Plate Count ◽  
Thermoelectric Cooler ◽  
Water Binding ◽  
Fish Fillets ◽  
Pangasius Bocourti

Preservation of fish products is a big issue where inconsistent electricity supply. In the current study, a solar thermoelectric cooler (STC) was fabricated by exploiting the solar energy and its cooling potential for fish preservation was evaluated. The STC consists of a photovoltaic (PV) panel, battery, PV charge controller, thermoelectric cooling system, and cooler box. The temperature of the STC decreased to 7.4ºC within 90 minutes and then reached 5±0.2ºC in 150 min. The cooling capacity and coefficient of performance of the STC were 23.8 W and 0.44, respectively, at an input electric current of 3.5 A. The Pangasius bocourti fish fillets were stored in the STC for 10 days and tested its quality at 2 days intervals. On day 10, thiobarbituric acid, peroxide, pH, water binding ability, total plate count values were 1.65mg MDA/kg, 5.04 mEqO2/kg, 7.16, 26.18%, and 4.26 log CFU/g, respectively. A significant reduction in hardness, springiness, and chewiness values was observed, whereas no cohesiveness changes. The color values L* and a* decreased significantly, whereas b* and ΔE increased. The sensory attributes were found in the range of 5.2-6.0 on the 10th day. As the quality parameters showing an acceptable level, STC could be an alternate green option for fish preservation.

scholarly journals Control of thermal regime of thermoelectric coolers in uniform temperature field

2021 ◽  
Vol 4 (4) ◽  
pp. 329-340
Author(s):  
Vladimir P. Zaykov ◽  
◽  
Vladimir I. Mescheryakov ◽  
Yurii Ivanovich Zhuravlov
Keyword(s):  
Thermal Regime ◽  
Single Stage ◽  
Stationary Mode ◽  
Thermal Mode ◽  
Thermoelectric Cooler ◽  
Modes Of Operation ◽  
Thermoelectric Coolers ◽  
Mode Of Operation ◽  
Operating Current ◽  
Basic Parameters

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.

scholarly journals PENGARUH PANJANG STACK SELUBUNG KABEL TERHADAP PERUBAHAN SUHU PADA SISTEM PENDINGIN TERMOAKUSTIK

2017 ◽  
Vol 2 (2) ◽  
pp. 119
Author(s):  
Indah Kharismawati ◽  
Hanif Rafika Putri
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Room Temperature ◽  
Initial Temperature ◽  
Temperature Drop ◽  
Maximum Temperature ◽  
Thermoelectric Cooler ◽  
Thermoelectric Coolers ◽  
Temperature Changes ◽  
Sheath Material

Research on environmentally friendly thermo-acoustic coolants uses a heat exchanger from the cable sheath material. The resonator tube used in the thermoelectric cooler is a 5.25 cm diameter PVC (polyvinyl chloride) tube with a length of 87 cm. Variations in stack lengths of 4cm, 5cm, 6cm, 7cm, and 8cm were performed to obtain results on thermoelectric coolers. Results are available on the use of stack length 4 cm high temperature 21.6 oC from the initial temperature), the stack length 5 cm high temperature 21.1 oC from the initial temperature (room temperature), the stack length of 6 cm resulted in a maximum temperature drop of 22.6 oC from the initial temperature (room temperature), the stack length of 7 cm resulted in a maximum temperature drop of 22.0 oC from the initial temperature (room temperature), while the stack length of 8 cm resulted in a decrease in temperature maximum of 23.3 oC from the initial temperature (room temperature). Keywords: Thermoacoustic, stack, temperature changes.

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