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Method for preparing nano fluid for heat transfer medium of solar heat exchange system

A heat exchange system and nanofluid technology, applied in the field of nanofluid preparation, can solve problems such as poor heat transfer capacity and slow cooling speed

Inactive Publication Date: 2010-06-16
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a method for preparing a nanofluid used in a heat transfer medium of a solar energy heat exchange system. The invention can not only significantly improve the heat collection efficiency of the solar heat exchange system, but also has fast heating speed, slow cooling speed, low cost and simple preparation process, and can efficiently utilize solar energy resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take Al 2 o 3 Nanoparticles as additives, Al 2 o 3 The particle size of the nanoparticles is 10 nanometers, and the addition amount is 0.1% by volume; the mixture of water / ethylene glycol is used as the base liquid, and the surfactant cetyltrimethylammonium bromide is added, and the mixture is stirred vigorously, Ultrasonic vibrations are used to prepare nanofluids; the prepared nanofluids are used as heat transfer media and applied in solar heat exchange systems. The test results show that the temperature of the nanofluid is up to 3.5 degrees Celsius higher than that of the pure water / ethylene glycol mixture during a day (July, 6:00 am to 6:00 pm) of heat absorption.

Embodiment 2

[0015] TiO 2 Nanoparticles as additives, TiO 2 The particle size of nanoparticles is 5 nanometers, and the addition amount is 0.5% by volume; the mixture of water / ethylene glycol is used as the base liquid, and the surfactant sodium dodecylbenzenesulfonate is added, and the mixture is stirred vigorously and ultrasonically It is formulated into nanofluid; the prepared nanofluid is applied in a solar energy heat exchange system. The test results show that the temperature of the nanofluid is up to 2.3 degrees Celsius higher than that of the pure water / ethylene glycol mixture during a day (July, 6:00 am to 6:00 pm) of heat absorption.

Embodiment 3

[0017] Using ZnO nanoparticles as additives, the particle size of ZnO nanoparticles is 30 nanometers, and the addition amount is 1.0% by volume; the mixture of water / propylene glycol is used as the base liquid, and the surfactant polyethylene glycol is added, and the mixture is stirred vigorously. , Ultrasonic vibration is prepared into a nanofluid; the prepared nanofluid is applied in a solar heat exchange system, and the test results show that: during the heat absorption process of a day (July, from six in the morning to six in the afternoon), the temperature of the nanofluid The highest temperature is 2.8 degrees Celsius higher than that of pure water / propylene glycol mixture.

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Abstract

The invention relates to a method for preparing nano fluid for a heat transfer medium of a solar heat exchange system, which comprises the following steps: selecting one of Al2O3, TiO2, ZnO, Ni and Cu nano grains with the grain diameter of 5 to 100 nanometers as additive, selecting water or water / ethylene glycol or water / propylene glycol mixture as base solution, adding surfactant into the solution, and strongly stirring and ultrasonically oscillating to form the nano fluid which is used for the heat transfer medium of the solar heat exchange system, wherein the Al2O3, TiO2, ZnO, Ni or Cu nano grains account for 0.1 to 3 volume percent of the volume of the nano fluid. The practical detection result for placing the solar heat exchange system on the roof shows that the nano fluid can remarkably improve the heat collecting efficiency of the solar heat exchange system, has the advantages of high heating speed, low cooling speed, low cost and simple preparation process and can remarkably improve the heat collection and heat utilization efficiencies of the existing solar heat collecting system.

Description

technical field [0001] The invention relates to a preparation method of a nanofluid used as a heat transfer medium of a solar heat exchange system. The method of the invention can improve the heat collection efficiency of the solar heat exchange system and realize efficient utilization of solar energy resources. Background technique [0002] Nanofluid refers to the stable and uniform suspension prepared by adding nanoscale oxides, metal or non-metal elemental particles into the heat transfer fluid, and preparing by stirring, ultrasonic oscillation and other methods. Due to the characteristics of stability, homogeneity, and enhanced heat transfer, nanofluids are expected to be used as heat transfer media in a new generation of heat exchange systems. The field of thermal control of weapons has broad application prospects, and nanofluids as an alternative medium have become a research hotspot in the field of materials and heat transfer. Studies have shown that adding Al 2 o ...

Claims

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Application Information

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IPC IPC(8): C09K5/08
Inventor 黎阳谢华清
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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