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System and method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on power generation efficiency of thermoelectric generation system

A technology of nanofluid and heat transfer coefficient, applied in the system field, can solve problems such as errors, achieve the effects of ensuring accuracy, reducing measurement errors, and improving measurement accuracy and stability

Active Publication Date: 2016-12-07
江苏南通创源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the heat transfer performance of a fluid is strongly correlated with the relevant characteristics of the pipe it flows through, so independent characterization of the thermophysical properties of nanofluids and the cooling effect of thermoelectric devices will bring certain errors

Method used

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  • System and method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on power generation efficiency of thermoelectric generation system
  • System and method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on power generation efficiency of thermoelectric generation system
  • System and method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on power generation efficiency of thermoelectric generation system

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Experimental program
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Effect test

Embodiment 1

[0034] Disperse 0.5g of nano-alumina (VK-L06, 30+5nm) in 500ml of deionized water, adjust the pH to 8 with 0.05mol / L NaOH solution, then add 0.5g of sodium dodecylbenzenesulfonate (SDBS), Ultrasonic dispersion was carried out for 1 hour, and after standing for 14.5 hours, ultrasonic wave was used for 0.5 hour to prepare nano-alumina-water nanofluid system. Control the temperature of the nanofluid in the liquid storage tank to 60°C, set the temperature of the cold water bath to 10°C and 20°C successively, and measure the T 1 , T 2 , T w The temperature at the place, according to the formula ln[(T w -T 2 ) / (T w -T 1 )] Calculate the relationship between the measured temperature and the flow velocity at the three points, and then substitute the mass flow velocity, specific heat capacity and related dimensions, according to h=-m v C p ln[(T w -T 2 ) / (T w -T 1 )] / 2rπΔL can be obtained nanofluid enhanced heat transfer coefficient, the specific results are as follows fig...

Embodiment 2

[0036] 0.80 g of graphene oxide was added to 800 ml of deionized water, ultrasonicated for 1 h, and then stirred at a rotational speed of 1000 r / min for 1.5 h to obtain a graphene oxide-water system nanofluid. Disperse 0.5g of nano-alumina (VK-L06, 30+5nm) in 500ml of deionized water, adjust the pH to 8 with 0.05mol / L NaOH solution, and then add 0.5g of sodium dodecylbenzenesulfonate (SDBS) , ultrasonically dispersed for 1 h, and then ultrasonically 0.5 h after standing still for 14.5 h to obtain a nano-alumina-water nanofluid system. The temperature of the nanofluid in the liquid storage tank is controlled to be 60°C, the temperature of the cold water bath is set to 10°C, and the temperature of the hot end of the thermoelectric device is set to 100°C. The thermoelectric device adopts 48 pairs of bismuth telluride-based frame structure thermoelectric devices with an internal resistance of 0.2342Ω. Measure the thermoelectric voltage of the thermoelectric device and the current...

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Abstract

The invention relates to a system and a method for synchronously testing nanofluid heat transfer coefficient and influence rule thereof on the power generation efficiency influence rule of a thermoelectric generation system. The system mainly comprises a liquid storage tank, a peristaltic pump, a cold water bath, a copper pipe, a heat sink, a thermoelectric device, a heat source, a plurality of groups of thermocouples, a data acquirer, a computer control terminal and the like. The method comprises the following steps: measuring the temperature T1, T2 and T3 of nanofluid entering the inlet end of the cold water bath, at the distance away from the inlet end by 20-30cm and in the cold water bath, calculating the intensified convection heat transfer performance of the nanofluid according to constant-temperature boundary conditions. Heat carried by the nanofluid is estimated by distributing the thermocouples on the heat sink from top to bottom, and the thermoelectric conversation efficiency under differnet nanofluid working conditions can be obtained by combining the conversation power of the thermoelectric devices. The synchronous testing on the intensified heat transfer coefficient of nanofluid under different working conditions, and the influence of the intensified heat transfer coefficient of nanofluid under different working conditions on the cooling effect of the cold end of the thermoelectric devices as well as the influence on the conversation efficiency can be realized, the measurement errors can be decreased, and the testing accuracy can be improved.

Description

technical field [0001] The invention relates to a system and a method, in particular to a system and a method for synchronously testing the heat transfer coefficient of a nanofluid and its influence on the power generation efficiency of a thermoelectric power generation system. Background technique [0002] With the increasingly severe situation of environmental pollution and energy shortage, the search for clean and environmentally friendly new energy sources and new energy conversion methods has become the focus of various research institutions and energy companies. Among many new energy conversion technologies, thermoelectric power generation (TEG) system has attracted the interest of many researchers due to its static operation, environmental friendliness, and high reliability. The thermoelectric power generation system is a thermal energy utilization system that uses the Seebeck effect of semiconductors to convert thermal energy into electrical energy. When there is a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01R21/02
CPCG01N25/20G01R21/02
Inventor 吴子华谢华清李奕怀刘安邦王元元邢姣娇
Owner 江苏南通创源材料科技有限公司
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