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Microscale-channel solar heat collector

A solar collector and micro-scale technology, applied in solar collectors, solar collectors using working fluid, solar thermal energy, etc., can solve the problems of inconvenient use, low coefficient of fluid heat transfer film, and promotion of heat transfer Weak effect and other problems, to achieve the effect of improving heat transfer synergy, improving convective heat transfer coefficient, and promoting heat transfer synergy

Inactive Publication Date: 2013-04-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many kinds of existing solar collector technologies, such as tube-type and plate-type solar collectors, etc. The current channel size of solar collectors is generally relatively large (above 5mm), and the volumetric heat capacity of water is large. The heating speed is slow, it takes a long time to make the water reach the expected water temperature, and it is not convenient to use, and the heating surface is generally a flat and smooth surface, so that the angle between the velocity field and the temperature field of the fluid is 90°, and the heat transfer field The synergistic promotion effect is basically zero, the promotion effect of the fluid motion on the heat transfer is very weak, the heat transfer film coefficient of the fluid is low, and the heat transfer rate is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a micro-scale channel solar collector includes a micro-scale channel heat collecting plate 1, an upper water storage tank 2, a water outlet pipe 3, a downcomer pipe 4, a lower connecting pipe 5, and a water supply pipe 6. The micro-scale channel The heat collecting plate 1 is respectively connected with the upper water storage tank 2 and the lower connection pipe 5, and the downcomer 4 is respectively connected with the upper water storage tank 2 and the water supply pipe 6, and the microscale channel heat collecting plate 1, the upper water storage tank 2, The downcomer 4 , the water replenishment pipe 6 and the lower connecting pipe 5 form a closed circuit circulation channel, the outlet pipe 3 is connected to the upper water storage tank 2 , and the water replenishing pipe 6 is connected to the lower connecting pipe 5 .

[0035] The upper water storage tank 2 is a cylindrical container made of stainless steel or copper;

[0036] The barrel...

Embodiment 2

[0051] The structure of a micro-scale channel solar collector in this embodiment is the same as that in Embodiment 1, but in this embodiment, the distance between the base plate and the heating surface is 1.5 mm, and the base plate is made of stainless steel with a thickness of 1.5 mm. ;The heating surface adopts a symmetrical folding line plate surface, the material is stainless steel, the thickness is 1mm, the width of the heating surface and the bottom plate are both 1m, and the length is 2m, the gasket frame is made of rubber insulation material, the thickness of the gasket frame is 20mm, and the width is 10mm , the frame of the gasket is flush with the heating surface when it is fixed; in this embodiment, the insulation board is made of foam plastic, the thickness is 15mm, and it is flush with the bottom plate when it is fixed;

[0052]In this embodiment, the diameter of the upper water storage tank is 120 mm, the length is 1.1 mm, the thickness of the tank is 1.5 mm, and ...

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Abstract

The invention discloses a microscale-channel solar heat collector, comprising a microscale-channel heat collecting board, an upper water storage tank, a water discharge pipe, a downspout, a lower connecting pipe and a water replenishing pipe, wherein the microscale-channel heat collecting board comprises a microscale-structure fluid channel, a transparent glass plate and a heat insulation plate, and the microscale-structure fluid channel is composed of a bottom plate, a heating surface, and sealing strips located on two sides of the microscale-structure fluid channel, and the bottom plate and the heating surface are parallel to each other. According to the invention, the volumetric heat capacity of water is reduced obviously by means of the microscale-structure fluid channel, the heating-based temperature rise speed of fluid is accelerated, the expected heating temperature of water can be reached in a short time, meanwhile, heat transfer enhancement is promoted by utilization of the repeated replacement and disturbance made by periodical concave-convex rough ribbed surfaces of the heating surface of the heat collector to the fluid in the fluid channel, so that the flow rate and the turbulivity of the fluid in a heat-transfer boundary layer are improved effectively, the film coefficient of heat transfer of the fluid is strengthened and improved, and the heat transfer rate of the heat collector is increased.

Description

technical field [0001] The invention relates to a solar thermal collector, in particular to a microscale channel solar thermal collector. Background technique [0002] There are many kinds of existing solar collector technologies, such as tube-type and plate-type solar collectors, etc. The current channel size of solar collectors is generally relatively large (above 5mm), and the volumetric heat capacity of water is large. The heating speed is slow, it takes a long time to make the water reach the expected water temperature, and it is not convenient to use, and the heating surface is generally a flat and smooth surface, so that the angle between the velocity field and the temperature field of the fluid is 90°, and the heat transfer field The synergistic promotion effect is basically zero, the promotion effect of the fluid motion on the heat transfer is very weak, the heat transfer film coefficient of the fluid is low, and the heat transfer rate is low. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/20F24J2/46F24S10/50
CPCY02E10/44
Inventor 邓先和王娜张青
Owner SOUTH CHINA UNIV OF TECH