Nanofluid-based system for improving solar thermoelectricity generating efficiency

A nanofluid and thermoelectric power generation technology, applied in solar thermal power generation, solar heating systems, solar collectors using working fluids, etc., can solve problems such as the temperature difference between the cold and hot ends, the temperature of the cold end rising, and the efficiency of the STEG system. , to achieve the effect of reducing thermal resistance, reducing heat loss, and enhancing heat transfer at the cold end

Inactive Publication Date: 2016-11-16
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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AI Technical Summary

Problems solved by technology

If heat accumulates at the cold end of the STEG system and cannot be dissipated quickly and effectively, the temperature of the cold end will rise, resulting in a decrease in the temperature difference between the cold and hot ends, thereby affecting the efficiency of the STEG system

Method used

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  • Nanofluid-based system for improving solar thermoelectricity generating efficiency
  • Nanofluid-based system for improving solar thermoelectricity generating efficiency
  • Nanofluid-based system for improving solar thermoelectricity generating efficiency

Examples

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Effect test

Embodiment 1

[0039] Water and carbon nanotube-water nanofluid are used as the cooling fluid at the cold end, the inlet temperature of the cooling fluid is set at 22°C, and the equivalent diameter of the fluid is 10mm×10mm. Due to the dependence of STEG system power, efficiency and thermoelectric power generation device temperature, when the coolant water flow rate increases from 0.001 to 0.05m / s, the output power increases from 0.647W to 1.68W. At the same time, the efficiency of thermoelectric power generation system increased from 0.0792 to 0.129. When the temperature of the hot end of the thermoelectric power generation system is fixed, the flow rate of the coolant at the cold end is an important factor affecting the output power and system efficiency of the STEG system. Such as image 3 As shown, the enhanced heat transfer effect of the nanofluid increases the output power of the STEG system by 22.7% and the system efficiency by 11% when the speed is 0.001m / s.

Embodiment 2

[0041] Two sets of direct absorption vacuum tubes are used to simulate the solar-to-thermal conversion performance of different fluids. During the test, the vacuum heat collection tubes of the two sets of collectors absorb the same heat under the same sunlight, and the heat exchange medium is transported by the infusion pump. From the installation The heat exchange medium absorbs heat and the temperature rises when the flow channel tube in the vacuum heat collection tube flows through. Figure 4 The temperature change test results within 24 hours are given when different kinds of nanofluids and matrix liquids are used as the heat exchange medium of the solar water heating system. The matrix liquid used is deionized water, the volume content of nanoparticles is 1.0%, and the nanoparticle used There are three kinds, namely Al 2 o 3 , MgO and ZnO. It can be seen from the figure that for the three nanofluids used, the temperature within 24 hours is higher than that of the matrix...

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Abstract

The invention relates to a nanofluid-based system for improving the solar thermoelectricity generating efficiency. The nanofluid-based system comprises a nanofluid-based direct absorption type vacuum pipe heat collecting system, a nanofluid-based heat storage pool, a nanofluid-based cold end radiator, a thermoelectric device heat end heat exchanger and a thermoelectricity generating system; the nanofluid-based direct absorption type vacuum pipe heat collecting system is connected with the nanofluid-based heat storage pool through a pipeline; the nanofluid-based heat storage pool is connected with the thermoelectric device heat end heat exchanger through a pipeline; the thermoelectric device heat end heat exchanger and the thermoelectricity generating system are directly installed together; the nanofluid-based cold end radiator is a radiator of the thermoelectricity generating system; and the nanofluid-based cold end radiator and the thermoelectricity generating system are connected together through a pipeline. By means of the nanofluid-based system for improving the solar thermoelectricity generating efficiency, integration of heat absorption, transfer and storage is achieved, a heat exchanger is omitted in the solar optothermal absorption, storage and conveying processes, the heat exchange link is simplified, and thermal energy losses are decreased.

Description

technical field [0001] The invention relates to a system for improving the efficiency of solar thermal power generation, in particular to a system for improving the efficiency of solar thermal power generation based on nanofluids. Background technique [0002] Actively seeking new energy sources and new energy utilization methods has become a research hotspot in the world today. Among the renewable energy represented by solar energy, wind energy, geothermal energy, and biomass energy, solar energy has attracted the attention of major research institutions around the world due to its characteristics of infinity, universality, cleanliness, and economy. According to authoritative forecasts, by the middle of this century, solar energy will become the most important part of the energy structure. It can be seen that the study of solar energy utilization is of great significance to maintain sustainable economic development and ensure national energy security, and solar power gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/05F24J2/34F24J2/46H02N11/00F24S10/40
CPCF24S10/45F24S60/00F24S80/00F24S2080/03H02N11/002Y02E10/44
Inventor 吴子华谢华清李奕怀刘安邦王元元邢姣娇
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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