CN202254392U - Vacuum pipe solar thermal collector with thermal storage function - Google Patents

Abstract

The utility model relates to a vacuum tube solar heat collector with heat storage function, which belongs to the technical field of solar energy utilization. The device is composed of a solar vacuum tube, a sleeve tube, a heat pipe, a heat storage material, a sealing plug and a pipeline assembly. The heat pipe is installed in the solar vacuum tube, and a sleeve is installed outside the heating section of the heat pipe. The lower end of the sleeve is a blind end, and the upper end is fixed to the outer wall of the heat pipe. One side of the sleeve is coated with a selective absorption coating, and the sleeve is equipped with a heat storage material. The top end of the vacuum tube is sealed and connected with the heat pipe by a sealing plug, and the upper end of the heat pipe is inserted into the parallel casing on the pipe assembly. This device integrates heat collection and heat storage functions, so it can better absorb solar energy and store heat compared to ordinary solar vacuum tubes. The vacuum tube also has the advantages of light weight, modular free combination, convenient installation, fast start-up, strong antifreeze ability, good heat transfer performance, anti-fouling, reliable use, high pressure bearing, small heat loss and long life.

Description

A kind of vacuum tube solar heat collector with thermal storage function

technical field

The utility model relates to a solar heat collector, in particular to a vacuum tube solar heat collector with heat storage function, and belongs to the technical field of solar energy utilization.

Background technique

The radiant power of the sun reaches 3.8 x 1023 kW, of which about 1.08 x 1014 kW radiates to the surface of the earth. It is estimated that the energy radiated by the sun to the earth within one month can be as much as 10 times the total reserves of all non-renewable energy sources on the earth, including fossil fuels and atomic energy. Inexhaustible energy. my country is a country rich in solar energy resources. The annual sunshine hours of 2/3 of the country's land area are more than 2200h, and the total solar radiation per unit area is higher than 5016MJ/m2. The development and utilization of solar energy, which is rich in resources and widely distributed, can not only provide clean energy to human beings, but also meet the requirements of zero pollution and zero emissions, which can greatly accelerate and promote the realization of my country's energy conservation and emission reduction goals.

There are various ways to utilize solar energy, but at present, the direct thermal utilization of solar radiation is the simplest and most efficient way. As a high-efficiency heat transfer element, the heat pipe has developed rapidly since its inception and has been widely used in many fields. Combining solar vacuum tubes and heat pipes to form solar vacuum heat pipes brings together the advantages of the two; due to the combination of the respective advantages of vacuum tubes and heat pipes, solar vacuum heat pipes have strong antifreeze ability, fast start-up, good heat transfer performance, and Fouling, reliable use, high pressure bearing and small heat loss.

Contents of the invention

The utility model provides a vacuum tube solar heat collector with heat storage function with novel structure and high thermal efficiency to solve the problems of slow startup, poor infectious performance and short service life of the solar heat collector.

The technical scheme of the utility model is: a vacuum tube solar heat collector with heat storage function, which is composed of a solar vacuum tube 1, a casing 3, a heat pipe 4, a heat storage material 5, a sealing plug 6 and a pipe assembly 7. The heat pipe 4 is installed in the solar vacuum tube 1, and a casing 3 is installed outside the heating section of the heat pipe 4. The lower end of the casing 3 is a blind end, and the upper end is fixed to the outer wall of the heat pipe 4. The side of the casing 3 facing the sun is electroplated or coated with one or more layers. A layer of anti-oxidation selective absorption coating, heat storage material 5 is housed in the casing 3, and the top of the vacuum tube is sealed with the heat pipe 4 by a sealing plug 6. The upper end of the heat pipe 4 is inserted into the parallel casing on the pipe assembly 5 through the pipe hole of the lower header of the pipe assembly 5 . The sealing plug 6 is a fireproof cork through fireproof treatment or a metal plug, ceramic plug and glass with sealing effect for high temperature resistance. Fins 2 are installed on both sides of the heat pipe 4, and the side of the fins 2 facing the sun is electroplated or coated with one or more layers of anti-oxidation selective absorption coating. The solar vacuum tube 1 is a turbine vacuum tube that cancels the coating. The pipe assembly 5 is composed of upper and lower headers, one or more parallel casings evenly distributed between the two headers, and the lower header has one or more tube holes. The working fluid in the heat pipe 4 can be water, ethanol, methanol, acetone, etc. and mixtures thereof according to the working temperature range.

The working principle of the utility model is: solar radiation passes through the vacuum glass tube, irradiates the casing and fins, is absorbed by the selective coating, the temperature of the casing rises, and the heat is transferred to the heat storage material through the casing, and the heat storage material After the temperature rises or melts to store heat, the heat is transferred to the hot end of the heat pipe (evaporation section), and the working medium in the heat pipe absorbs heat and boils and evaporates. Under the action of the pressure difference, the gaseous heat pipe working medium is pressed to the cold end of the heat pipe ( condensing end); the gaseous working medium releases heat and condenses at the cold end, and transfers heat to the heated fluid outside the heat pipe, and at the same time, under the action of gravity, the condensate flows back to the bottom of the heat pipe (hot end) along the inner wall of the heat pipe to complete a cycle .

The heat collector adopts the combination structure of vacuum tube and heat pipe, so that the device has the advantages of both vacuum tube and heat pipe at the same time. The vacuum tube reduces the heat loss at the hot end of the heat pipe, and the use of heat pipe components increases the pressure bearing and antifreeze capabilities of the device. , the thermal capacity of the collector is reduced, and the start-up time of the collector is shortened. A sleeve with a heat storage material is added outside the hot end of the heat pipe, so that the device has a heat storage function while heating. The selective coating is applied on the outer wall of the outer casing of the hot end of the heat pipe and the fins, which can fully absorb solar energy and reduce the operating temperature of the vacuum tube glass. In addition, the well-shaped pipe assembly with casing structure at the cold end of the heat pipe can enhance heat exchange and improve the efficiency of the heat collector. Due to the adoption of the above-mentioned structural design, the utility model has the advantages of heat storage, fast start-up, strong anti-freezing ability, good heat transfer performance, anti-scaling, reliable use, high pressure bearing and small heat loss compared with ordinary solar collectors. And long life and other significant advantages.

The beneficial effects of the utility model are:

(1) Since the device uses heat pipes as heat transfer components, the device has a high pressure bearing capacity and is suitable for applications where the heated fluid is under pressure;

(2) The safety performance is good, which solves the problems of hot explosion in summer and cold explosion in winter of all-glass vacuum tubes, and can also operate normally in harsh external environments;

(3) Compared with the general solar heat collector, due to the integrated structure of heat collection and heat storage, the device can store heat while collecting heat, which enhances the heat storage capacity of the heat collector and also makes the The heating capacity of the collector becomes more stable.

(4) The selective absorption coating is applied on the casing and fins, which makes the device absorb solar radiation heat better, and at the same time can reduce the operating temperature of the vacuum tube glass, while reducing heat loss, it also prolongs the life of the vacuum tube service life.

(5) The well-shaped pipe assembly with casing structure at the cold end of the heat pipe can enhance heat transfer, improve the efficiency of the collector, and ensure the balanced heating of the heated fluid.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the top view of the utility solar vacuum tube;

The labels in Fig. 1-2 are: 1: solar vacuum tube, 2: fin, 3: casing, 4: heat pipe, 5: heat storage material, 6: sealing plug, 7: pipe assembly.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model will be further described, but the content of the utility model is not limited to said range.

Embodiment 1: As shown in Figure 1-2, a vacuum tube solar collector with heat storage function is composed of a solar vacuum tube 1, a sleeve 3, a heat pipe 4, a heat storage material 5, a sealing plug 6, and a pipe assembly 7 . The heat pipe 4 is installed in the solar vacuum tube 1, and a casing 3 is installed outside the heating section of the heat pipe 4. The lower end of the casing 3 is a blind end, and the upper end is fixed to the outer wall of the heat pipe 4. The side of the casing 3 facing the sun is coated with an anti-oxidation option The heat storage material 5 is housed in the casing 3, and the top of the vacuum tube is sealed with the heat pipe 4 by a sealing plug 6. The upper end of the heat pipe 4 is inserted into the parallel casing on the pipe assembly 5 through the pipe hole of the lower header of the pipe assembly 5 . The sealing plug 6 is a fireproof cork through fireproof treatment. Fins 2 are installed on both sides of the heat pipe 4, and the side of the fins 2 facing the sun is coated with an anti-oxidation selective absorption coating. The solar vacuum tube 1 is a turbine vacuum tube that cancels the coating. The pipe assembly 5 is composed of upper and lower headers, five parallel casings evenly distributed between the two headers, and the lower header has five pipe holes. The working fluid in the heat pipe 3 is water.

The working principle of the utility model is: solar radiation passes through the vacuum glass tube, irradiates the casing and fins, is absorbed by the selective coating, the temperature of the casing rises, and the heat is transferred to the heat storage material through the casing, and the heat storage material After the temperature rises or melts to store heat, the heat is transferred to the hot end of the heat pipe (evaporation section), and the working medium in the heat pipe absorbs heat and boils and evaporates. Under the action of the pressure difference, the gaseous heat pipe working medium is pressed to the cold end of the heat pipe ( condensing end); the gaseous working medium releases heat and condenses at the cold end, and transfers heat to the heated fluid outside the heat pipe, and at the same time, under the action of gravity, the condensate flows back to the bottom of the heat pipe (hot end) along the inner wall of the heat pipe, completing a cycle .

The heat collector adopts the combination structure of vacuum tube and heat pipe, so that the device has the advantages of both vacuum tube and heat pipe at the same time. The vacuum tube reduces the heat loss at the hot end of the heat pipe, and the use of heat pipe components increases the pressure bearing and antifreeze capabilities of the device. , the thermal capacity of the collector is reduced, and the start-up time of the collector is shortened. A sleeve with a heat storage material is added outside the hot end of the heat pipe, so that the device has a heat storage function while heating. The selective coating is applied on the outer wall of the outer casing of the hot end of the heat pipe and the fins, which can fully absorb solar energy and reduce the operating temperature of the vacuum tube glass. In addition, the well-shaped pipe assembly with casing structure at the cold end of the heat pipe can enhance heat exchange and improve the efficiency of the heat collector. Due to the adoption of the above-mentioned structural design, the utility model has the advantages of heat storage, fast start-up, strong anti-freezing ability, good heat transfer performance, anti-scaling, reliable use, high pressure bearing and small heat loss compared with ordinary solar collectors. And long life and other significant advantages.

Embodiment 2: As shown in Figure 1-2, a vacuum tube solar collector with heat storage function is composed of a solar vacuum tube 1, a sleeve 3, a heat pipe 4, a heat storage material 5, a sealing plug 6, and a pipe assembly 7 . The heat pipe 4 is installed in the solar vacuum tube 1, and the casing 3 is installed outside the heating section of the heat pipe 4. The lower end of the casing 3 is a blind end, and the upper end is fixed to the outer wall of the heat pipe 4. The side of the casing 3 facing the sun is electroplated with two layers for anti-oxidation. The heat storage material 5 is housed in the casing 3, and the top of the vacuum tube is sealed with the heat pipe 4 by a sealing plug 6. The upper end of the heat pipe 4 is inserted into the parallel casing on the pipe assembly 5 through the pipe hole of the lower header of the pipe assembly 5 . The sealing plug 6 is a metal plug with high temperature resistance and sealing effect. Both sides of the heat pipe 4 are equipped with fins 2, and the side of the fins 2 facing the sun is electroplated with two layers of anti-oxidation selective absorption coating. The solar vacuum tube 1 is a turbine vacuum tube that cancels the coating. The pipe assembly 5 is composed of upper and lower headers, seven parallel sleeves evenly distributed between the two headers, and the lower header has seven tube holes. The working fluid in the heat pipe 3 is a mixture of ethanol and methanol.

Claims (5)

1. the vacuum tube solar heating element with heat accumulation function is characterized in that: be made up of solar energy vacuum tube (1), sleeve pipe (3), heat pipe (4), heat-storing material (5), sealing-plug (6), conduit assembly (7); Heat pipe (4) is contained in the solar energy vacuum tube (1); Add tubing (3) in heat pipe (4) bringing-up section outside, sleeve pipe (3) lower end is a cecum, and the upper end is fixed on heat pipe (4) outer wall; Sleeve pipe (3) one sides scribble coating for selective absorption; Heat-storing material (5) is housed in the sleeve pipe (3), and the vacuum tube top is tightly connected with sealing-plug (6) and heat pipe (4), and insert in the parallel sleeve pipe on the conduit assembly (7) heat pipe (4) upper end.

2. a kind of vacuum tube solar heating element with heat accumulation function according to claim 1 is characterized in that: fin (2) is equipped with in heat pipe (4) both sides, and fin scribbles coating for selective absorption on (2).

3. a kind of vacuum tube solar heating element with heat accumulation function according to claim 1 and 2 is characterized in that: solar energy vacuum tube (1) is the turbine vacuum pipe of cancellation coating.

4. a kind of vacuum tube solar heating element with heat accumulation function according to claim 1 is characterized in that: sealing-plug (6) centre-drilling hole.

5. a kind of vacuum tube solar heating element according to claim 1 with heat accumulation function; It is characterized in that: said conduit assembly (7) is by the two parts pipe; The one or more parallel sleeve pipe that is uniformly distributed between two collectors is formed, and lower collector pipe has one or more pores.

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