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Inner pipe for solar water heater

A technology of solar water heaters and inner tubes, which is applied in the field of solar water heaters, can solve the problems of occasional performance degradation, and achieve the effects of high strength, improved work efficiency, good corrosion resistance and thermal conductivity

Inactive Publication Date: 2015-04-29
ZIBO BOXU RENEWABLE ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to achieve this goal, many patents have improved the material of the inner tube. However, many technologies have only improved the thermal conductivity and ignored the erosion of the material by water, resulting in good thermal conductivity at the beginning. However, as time goes by, due to the erosion of water on the inner pipe wall, the performance of the belt will be greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Recipe: (weight)

[0022] Graphene 0.8%, silicon 0.5%, iron 0.6%, copper 0.05%, manganese 1.6%, titanium 0.07%, zirconium 0.1%, samarium 0.06%, aluminum is the balance;

[0023] The preparation method comprises the following steps:

[0024] (1) melting each component in an oxygen-free vacuum according to the proportion, casting it into an ingot, and homogenizing it at 500-℃ for 2 hours;

[0025] (2) preparing the product of step (1) into a pipe by a method known in the art;

[0026] (3) Annealing the product of step (2) at 400° C. for 1 hour under anaerobic vacuum to obtain the inner tube of the solar water heater.

Embodiment 2

[0028] Recipe: (weight)

[0029] Graphene 0.3%, silicon 1.0%, iron 0.4%, copper 0.03%, manganese 1.8%, titanium 0.05%, zirconium 0.2%, samarium 0.07%, aluminum is the balance;

[0030] The preparation method comprises the following steps:

[0031] (1) melting each component in an oxygen-free vacuum according to the ratio, casting it into an ingot, and homogenizing it at 550° C. for 1 hour under an oxygen-free vacuum;

[0032] (2) preparing the product of step (1) into a pipe by a method known in the art;

[0033] (3) The product of step (2) is annealed at 420° C. for 3 hours in an oxygen-free vacuum to obtain the inner tube of the solar water heater.

Embodiment 3

[0035] Carry out water erosion test to the inner pipe that embodiment 1 and 2 obtain:

[0036] Tap water was continuously passed into the inner tube at a linear speed of 10 meters, the temperature was 55° C., and the passing time was 100 hours. The inner tube was broken and the inner tube wall was inspected. No water erosion was found.

[0037] Embodiment 1 is when 321W / (m*k) 20 degrees centigrade;

[0038] Embodiment 2 is when 330W / (m*k) 20 degrees centigrade;

[0039] The thermal conductivity of conventional aluminum alloys is:

[0040] 1050A 231W / (m*k) at 20 degrees Celsius;

[0041] 1060 234W / (m*k) at 20 degrees Celsius;

[0042] Among them: 1050A and 1060 are grades of aluminum alloy.

[0043] It can be seen that the corrosion resistance and thermal conductivity of the inner pipe of the present invention are superior to existing aluminum alloys, and can meet the needs of solar water heaters.

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PUM

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Abstract

The invention discloses an inner pipe for a solar water heater. The inner pipe is characterized by comprising 0.1-1wt% of graphene on the basis of aluminum as a basic material. Due to the addition of rare earth, microelements and graphene, the inner pipe for the solar water heater disclosed by the invention has relatively high strength, good corrosion resistance and heat-conducting property; the work efficiency of the solar water heater is greatly improved; and the requirements of people in daily application can be met.

Description

technical field [0001] The invention relates to a solar water heater, in particular to an inner tube of the solar water heater. Background technique [0002] Solar energy is both primary energy and renewable energy. It is rich in resources, can be used for free, does not need to be transported, and has no pollution to the environment. In the heat utilization of solar energy, the key is to convert the sun's radiant energy into heat energy. Since solar energy is scattered, it must be concentrated. [0003] Solar water heater is an important device to concentrate the sun's radiant energy, which can convert scattered solar energy into heat energy after being concentrated. [0004] A common solar water heater includes a heat collector, the heat collector includes an outer tube and a heat collecting inner tube, the heat collecting inner tube is arranged in the outer tube, and there is a vacuum between the two. [0005] The inner tube needs to have excellent thermal conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04
Inventor 于洪彪李峰
Owner ZIBO BOXU RENEWABLE ENERGY TECH