Nano-fluid direct absorption type solar heat collector

A solar heat collector and nanofluid technology, applied in the field of solar heat collectors, can solve the problems of large heat loss of heat collectors and low heat collection efficiency of heat collectors, and achieve small heat loss, high heat collection efficiency, and reduced heat loss Effect

Active Publication Date: 2013-02-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a nanofluid direct absorption solar heat collector to solve the problems of large heat loss and low heat collection efficiency of the traditional heat collector

Method used

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  • Nano-fluid direct absorption type solar heat collector
  • Nano-fluid direct absorption type solar heat collector
  • Nano-fluid direct absorption type solar heat collector

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specific Embodiment approach 1

[0009] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. Nanofluid direct absorption solar heat collector, which includes N vacuum tubes 1, N reflectors 2, first insulation communication tube 3 and second insulation communication tube 4, N vacuum tubes 1 are arranged in a row, and the two vacuum tubes 1 Both ends are open ends, one open end of each vacuum tube 1 communicates with the first heat preservation communication pipe 3 through the rotating interface respectively, and the other opening end of each vacuum tube 1 communicates with the second heat preservation communication pipe 4 through the rotating interface respectively, the second A connecting pipe 3 communicates with the water outlet, and the second heat preservation communicating pipe 4 communicates with the water inlet. A reflector 2 is arranged under each vacuum tube 1, and the working medium in each vacuum tube 1 includes a fluid matrix. Nanopar...

specific Embodiment approach 2

[0012] Embodiment 2: The difference between this embodiment and the nanofluid direct absorption solar collector described in Embodiment 1 is that: the vacuum tube 1 is a transparent glass vacuum tube with an elliptical axial cross-sectional shape.

[0013] In this embodiment, the cross-sectional shape of the vacuum tube 1 is elliptical, the major axis of the ellipse is 40-60 mm, and the short axis is 30-50 mm. Compared with the traditional vacuum tube with a circular cross-sectional shape, In the vacuum tube 1 described in this embodiment, the long axis of the ellipse faces the sun, which can increase the heat absorption area, reduce the thickness of the liquid layer of the working medium in the vacuum tube, and improve the heat collection efficiency of the solar collector.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and the nanofluid direct absorption solar collector described in specific embodiments one and two is that: the mirror axial projection of the reflector 2 is a parabola, and the vacuum tube 1 The center is at the focal point of the mirror 2 .

[0015] The reflective surface of the reflector 2 described in this embodiment is a parabolic curved surface, which can reflect and converge the sunlight incident on the reflective surface to the center of the vacuum tube 1. The concave reflector is arranged below the vacuum tube 1, so that the vacuum tube The back side of 1 receives the radiation of sunlight at the same time, which improves the heat collection efficiency of the solar heat collector described in this embodiment.

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Abstract

The invention relates to a nano-fluid direct absorption type solar heat collector, in particular to a solar heat collector, which solves the problems of great heat loss and low heat collection efficiency of the conventional heat collectors. The nano-fluid direct absorption type solar heat collector of the invention comprises N vacuum pipes, N reflecting mirrors, a first heat insulation communicating pipe and a second heat insulation communicating pipe, wherein the N vacuum pipes are arranged in a row; one open end of each vacuum pipe is communicated with the first heat insulation communicating pipe through a rotary joint respectively, while the other end is communicated with the second heat insulation communicating pipe through the rotary joint respectively; the first communicating pipe is communicated with a water outlet; the second heat insulation communicating pipe is communicated with a water inlet; one reflecting mirror is arranged below each vacuum pipe respectively; working medium in each vacuum pipe comprises a fluid substrate; nanoparticles are also added into the working medium in each vacuum pipe; and N is an integer more than 2. The solar heat collector is used for converting solar energy into heat energy.

Description

technical field [0001] The invention relates to a solar heat collector. Background technique [0002] With the continuous development of the economy, the problems of energy and the environment are becoming more and more prominent, and the traditional energy has a great impact on the environment. Therefore, the development of new energy to improve the utilization rate of energy is the current primary goal. As a safe, clean and cheap renewable energy, solar energy has attracted much attention. [0003] Solar heat collectors can convert solar energy into heat energy. Traditional heat collectors use transparent glass vacuum tubes as heat preservation devices, and use secondary heat exchange to transfer heat, that is, use absorbing coatings to absorb sunlight and heat, and absorb the absorbed sunlight. The heat is then transferred to the working medium water. Due to the low thermal conductivity of water and the large thermal resistance between solid and liquid, heat transfer re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/10F24J2/24F24J2/05F24J2/46F24J2/40C09K5/14F24S10/40F24S10/70F24S23/70
CPCY02E10/44
Inventor 何玉荣田枫林任亚涛张成秦斌
Owner HARBIN INST OF TECH
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