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Vacuum heat-absorbing tube of solar water heater

A technology for solar water heaters and heat-absorbing pipes, applied in solar thermal power generation, solar thermal devices, heating devices, etc., can solve problems affecting the thermal efficiency of solar water heaters, achieve the effects of reducing temperature difference, increasing hot water temperature, and increasing costs

Inactive Publication Date: 2011-02-09
WUXI INST OF ARTS & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature of the water in the vacuum heat absorbing tube, it absorbs solar energy and is also accompanied by external heat radiation, which affects the thermal efficiency of the solar water heater.

Method used

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  • Vacuum heat-absorbing tube of solar water heater
  • Vacuum heat-absorbing tube of solar water heater
  • Vacuum heat-absorbing tube of solar water heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: as figure 1 As shown, a vacuum heat absorbing tube of a solar water heater according to the present invention includes an inner tube 1 and an outer tube 2, and a return tube 3 is installed in the inner tube 1 and along the axial direction of the inner tube 1, and the return tube 3 and the vacuum tube The length of the inner tube 1 is equal; the diameter of the return tube 3 is less than the radius of the tube 1 in the vacuum tube, and the diameter of the return tube 3 is preferably 1.0cm; two through holes 4 are opened in the middle section of the return tube 3, near the bottom of the inner tube 1 Open 4 through holes 4 on one end of the solar vacuum heat absorbing tube, form two large circulations in the solar vacuum heat absorbing tube. Wherein the return pipe 3 is a plastic pipe with a small thermal conductivity.

[0019] When installing, first put the return pipe 3 into the inner pipe 1 of the vacuum heat absorbing pipe and rely on its own gravity aga...

Embodiment 2

[0020] Embodiment 2: A vacuum heat absorbing tube of a solar water heater according to the present invention comprises an inner tube 1 and an outer tube 2, a return tube 3 is installed in the inner tube 1 and along the axial direction of the inner tube 1, and the return tube 3 is connected to the inner tube 1. The inner pipe 1 length of vacuum tube is equal; The diameter of return pipe 3 is less than the radius of pipe 1 in vacuum pipe, and the diameter of return pipe 3 is preferably 1.2cm; As figure 2 As shown, a row of small through holes 4 is opened between the middle section on the return pipe 3 and the end near the bottom of the inner pipe 1, and the number of through holes 4 is 4 to 6, so that 4 holes are formed in the solar vacuum heat absorbing pipe. ~6 large circulations. Wherein the return pipe 3 is a plastic pipe with a small thermal conductivity.

[0021] The installation method is basically the same as that in Embodiment 1.

Embodiment 3

[0022] Embodiment 3: A vacuum heat absorbing tube of a solar water heater according to the present invention includes an inner tube 1 and an outer tube 2, and a return tube 3 is installed in the inner tube 1 and along the axial direction of the inner tube 1, and the return tube 3 is connected to the inner tube 1. The inner pipe 1 length of vacuum tube is equal; The diameter of return pipe 3 is less than the radius of pipe 1 in vacuum pipe, and the diameter of return pipe 3 is preferably 0.8cm; As image 3 As shown, a row of the small through holes 4 is opened between the two ends of the return pipe 3, and the number of the through holes 4 is 6 to 10, so that 6 to 10 large circulations are formed in the solar vacuum heat absorbing tube. where is the thermal conductivity of the small glass tube.

[0023] The installation method is the same as in Embodiment 1.

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Abstract

The invention discloses a vacuum heat-absorber of a solar water heater, comprising an inner tube and an outer tube, wherein a reflow tube is arranged in the inner tube along the axial direction of the inner tube and is provided with a small through hole. The invention has the advantages that: on the basis of the traditional solar water heater and under the same condition, by improving the internal structure of the solar vacuum heater-absorbing tube, enhancing lager circular current between hot water in the solar vacuum heat-absorbing tube and water in a heat-preserving container and reducing the temperature difference between the hot water in the solar vacuum heat-absorbing tube and the water in the heat-preserving container, solar energy absorbed by the solar vacuum heat-absorbing tube can be transmitted to and stored in the heat-preserving container in time, heat-radiating loss of hot water which generates heat radiation due to the high temperature in the solar vacuum heat-absorbingtube can be reduced, thereby improving the heat efficiency of the solar water heater; and compared with the prior art, the invention can remarkably improve the heat efficiency of the solar water heater by 2-8 percent by increasing cost slightly and can improve the temperature of the hot water of the solar water heater by 1-5DEG C.

Description

technical field [0001] The invention relates to the field of solar water heaters, in particular to a vacuum heat-absorbing tube of a solar water heater. Background technique [0002] At present, solar water heaters rely on solar vacuum heat-absorbing tubes to absorb solar heat to heat the water in the tubes, and the water heated in the tubes exchanges heat with the water in the thermal insulation barrel due to buoyancy, so that the temperature of the water in the thermal insulation barrels increases and becomes hot water for people to use. . Since the vacuum heat absorbing tube of the solar water heater is slender and the inner diameter is relatively small relative to the length, due to the heat conduction and flow characteristics of water, it is difficult to form a large circulation in which the hot water heated by the outer layer flows upward and the unheated water in the inner layer flows downward. , only a plurality of small circulations are formed in the tube, and the ...

Claims

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Application Information

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IPC IPC(8): F24J2/46
CPCY02E10/40
Inventor 顾永成
Owner WUXI INST OF ARTS & TECH
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