Ordered flow solar vacuum glass tube heat collector

Abstract

An ordered flow solar vacuum glass tube heat collector is composed of a row of vacuum glass tubes, a collection box and a support, inner cavities of the vacuum glass tubes and the collection box are separated into two flow channels which are not interfered with each other through comb-tooth-shaped separation pieces, tooth portions of the comb-tooth-shaped separation pieces are inserted into the vacuum glass tubes, and a distance is reserved between the tooth ends of the comb-tooth-shaped separation pieces and the blind ends of the vacuum glass tubes. And the comb handle part is arranged in the collection box. According to the heat collector, ordered flowing of low-temperature fluid and high-temperature fluid in the collecting box and the vacuum glass tubes is achieved, mutual interference is avoided, the cold and heat replacement efficiency is high, the utilization efficiency of a solar water heating system is improved, and compared with projects with the same heating power, the number of the solar vacuum glass tubes, matched components and the occupied area can be greatly reduced; and the project investment cost is greatly reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of solar energy utilization equipment, and in particular relates to an ordered flow solar vacuum glass tube collector for a solar heating system. Background Art

[0002] Solar vacuum glass collector tube is a key component widely used in solar heating systems. It adopts a two-layer glass tube form of a large tube sleeved with a small tube. The space between the inner and outer layers of glass is evacuated to a vacuum. The surface of the inner glass tube is coated with a spectrally selective absorption coating. After the sunlight is absorbed by the coating, the solar energy is converted into heat energy to heat the fluid in the inner tube. The vacuum layer between the inner and outer glass plays a role in heat preservation for the heated fluid.

[0003] Solar vacuum glass collector tubes are generally made in a form with one end closed as a blind end and the other end open. This form is not conducive to the orderly flow of cold and hot fluids, and the efficiency of cold and hot water replacement is low, which affects the further improvement of the thermal efficiency of the solar water heating system. Summary of the invention

[0004] In order to solve the above problems, the present application proposes an ordered flow solar vacuum glass tube collector, which consists of a row of vacuum glass tubes, a collecting box and a bracket. The vacuum glass tubes and the collecting box each have two independent fluid channels. The low-temperature fluid and the high-temperature fluid flow in an orderly manner without interfering with each other. The high-temperature fluid heated by solar energy in the vacuum glass tube is pushed out by the low-temperature fluid. The contact surface between the cold and hot fluids is small, and the quality will not be reduced due to the mixing of large volumes of cold and hot fluids. The efficiency of cold and hot alternation is high, which improves the utilization efficiency of the solar water heating system. Compared with projects with the same heating power, the number of solar vacuum glass tubes can be greatly reduced, and the supporting components, floor space, etc. are correspondingly reduced, which greatly reduces the project investment cost.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The vacuum glass tube collector described in the present application is provided with a comb-tooth-shaped spacer, the teeth of which are inserted into the vacuum glass tube to divide the space inside the tube into two fluid channels on the light-facing side and the back-lighting side, and the tooth ends are spaced apart from the blind end of the vacuum glass tube to form a fluid return space; the comb handle of the comb-tooth-shaped spacer is located in the collection box to divide the inner cavity of the collection box into two flow channels, the lower flow channel is connected to the back-lighting side of the vacuum glass tube, and the upper flow channel is connected to the light-facing side of the vacuum glass tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a front schematic diagram of the collector described in this application;

[0008] Figure 2 This is a schematic diagram of the connection between the vacuum glass tube and the collection box of the collector described in this application;

[0009] Figure 3 A schematic diagram of the comb-shaped spacer of the collector described in this application;

[0010] Figure 4 The fluid flow diagram of the collector described in this application;

[0011] Figure 5 A schematic diagram of an application example of the collector described in this application;

[0012] Figure 6 for Figure 1 BB cross-sectional view;

[0013] Figure 7 This is the fluid flow diagram of a conventional collector.

[0014] The serial numbers in the above drawings are explained as follows:

[0015] 1-vacuum glass tube, 2-comb-shaped spacer, 21-tooth portion, 22-comb handle portion, 211-tooth end, 3-collecting box, 31-inlet, 32-baffle, 33-outlet, 34-insulation layer, 35-sealing ring, 4-bracket, 5-insulation water tank, 6-circulation pump. DETAILED DESCRIPTION

[0016] In conjunction with the above drawings, the specific implementation of the collector described in this application is described as follows:

[0017] The ordered flow solar vacuum glass tube collector described in the present application is composed of a row of vacuum glass tubes 1, a collection box 3 and a bracket 4. A plurality of solar vacuum glass collector tubes (hereinafter referred to as vacuum glass tubes 1) with one end open and the other end closed are arranged in a row, at an angle A to the ground, and placed on the bracket 4. The open end of the vacuum glass tube 1 faces upward and is inserted into the collection box 3. The angle A is set according to the average solar daily irradiation angle of the installation site.

[0018] The collection box 3 is a long square tube or round tube, and a row of round holes and sealing rings 35 matching the vacuum glass tube 1 are arranged in the length direction. The open end of the vacuum glass tube 1 is inserted into the collection box 3 through the round hole, and the sealing ring 35 is stuck between the round hole and the vacuum glass tube 1 to seal the fluid.

[0019] In order to achieve orderly flow of fluid, the inner cavities of the vacuum glass tube 1 and the manifold 3 are isolated into two fluid channels that do not interfere with each other. Figure 3The comb-toothed spacer 2 shown has the same number of teeth 21 as the number of vacuum glass tubes 1, which are inserted into each vacuum glass tube 1 respectively. The width of the teeth 21 is matched with the inner diameter of the vacuum glass tube 1 with a small gap, which is convenient for insertion and is basically limited to the maximum diameter position, dividing the inner cavity of the vacuum glass tube 1 into two fluid channels on the light-facing side and the backlight side; the tooth end 211 of the comb-toothed spacer 2 is separated from the blind end of the vacuum glass tube 1 by a distance K, and the value of the distance K is 1 to 2 times the inner diameter of the vacuum glass tube 1; the comb handle 22 of the comb-toothed spacer 2 is located in the collection box 3, dividing the inner cavity of the collection box 3 into two flow channels, the one communicating with the backlight side of the vacuum glass tube 1 is the lower flow channel, and the one communicating with the light-facing side of the vacuum glass tube 1 is the upper flow channel.

[0020] The two ends of the manifold box 3 are respectively provided with an input port 31 and an output port 33, the input port 31 is communicated with the lower flow channel, the output port 33 is communicated with the upper flow channel, and the output port 33 is arranged at the highest point of the end surface to prevent gas accumulation in the manifold box 3 to form gas blockage;

[0021] A baffle plate 32 is provided at a certain distance inside the input port 31 of the collecting box 3 to reduce the inlet flow velocity, and a heat preservation layer 34 is wrapped around the outer periphery of the collecting box 3 .

[0022] Figure 4 and Figure 7 The figure shows the difference between the fluid flow state in the vacuum glass tube 1 of the collector described in the present application and that of the conventional collector. The arrows in the figure indicate the flow direction of the fluid and the direction of sunlight. The fluid in the vacuum glass tube 1 of the collector described in the present application achieves orderly flow.

[0023] Figure 5 This is a schematic diagram of the application of the collector described in this application to a solar water heating system, in which the low-temperature water in the lower position of the insulated water tank 5 is sent into the lower flow channel of the collecting box 3 from the input port 31 through the circulating pump 6 and the pipeline, and then flows through the back-lighting flow channel of the vacuum glass tube 1, turns back at the blind end of the vacuum glass tube 1, flows through the light-facing flow channel and is heated to high-temperature water, then enters the upper flow channel of the collecting box 3, and then enters the high position of the insulated water tank 5 through the output port 33 and the subsequent pipeline. In this cycle, the water in the insulated water tank 5 is heated to the required temperature.

[0024] In order to verify the beneficial effects of the collector described in this application, the applicant conducted a comparative test with a conventional collector, as follows:

[0025] The test setup is of the same size:

[0026] The solar vacuum glass collector tubes have the same outer diameter of 58mm, the same length of 2.1m, and the same number of 38 in parallel; the matching headers have the same size, the water tanks have the same size and volume of 0.1 cubic meters, and the same insulation conditions.

[0027] The test conditions are the same:

[0028] The test was carried out simultaneously at the same location in Chengdu on a sunny day. The test period was 9:00-18:00. The water volume (including the collector tube, water tank, header and pipeline) was 230 kg, the water circulation flow rate was 27 kg / h, and the circulation lasted for 1 hour with an interval of 1 hour.

[0029] The results of the test are:

[0030] The average water temperature in the water tank of the collector device described in the present application was heated from 28.05°C to 42.86°C, a temperature rise of 14.81°C;

[0031] The average water temperature in the water tank of the conventional collector device was heated from 29.45°C to 36.77°C, a temperature rise of 7.32°C.

[0032] After repeated tests, the temperature rise data has a slight deviation, but the temperature rise of the heated water in the collector described in this application is about twice that of a conventional collector, which is equivalent to the operating parameters, including flow rate, water volume, solar radiation conditions, etc. The number of vacuum glass tubes in the collector described in this application can be reduced to 1 / 2 of that of a conventional collector.

[0033] In summary, the beneficial effects of this application are:

[0034] There are two independent fluid channels in the vacuum glass tube and the collecting box, which realize the orderly flow of low-temperature fluid and high-temperature fluid without interfering with each other. The high-temperature fluid heated by solar energy in the vacuum glass tube is pushed out by the low-temperature fluid. The contact area between the cold and hot fluids is small, and the quality will not be reduced due to the mixing of large volumes of cold and hot fluids. The efficiency of cold and hot alternation is high, which improves the utilization efficiency of the solar water heating system. Compared with projects with the same heating power, it can greatly reduce the number of solar vacuum glass tubes, supporting components, and floor space, and significantly reduce project investment costs.

[0035] It should be noted that the above example is only one of the application examples of the present application. The collector described in the present application can also be applied to heating scenarios of air or other fluids. Based on the embodiments in the present application, other embodiments obtained by others without making creative work should all fall within the scope of protection of the present application.

Claims

1. An ordered flow solar vacuum glass tube collector, comprising a row of vacuum glass tubes (1), a collecting box (3) and a bracket (4), characterized in that: The inner cavities of the vacuum glass tube (1) and the collection box (3) are both separated into two fluid channels. A comb-tooth-shaped spacer (2) is provided, the number of its teeth (21) being the same as the number of the vacuum glass tubes (1). The spacer is inserted into each vacuum glass tube (1) to form two fluid channels, one on the light-facing side and the other on the light-receiving side. The tooth ends (211) of the spacer are spaced a distance K from the blind end of the vacuum glass tube (1). The comb handle (22) of the comb-tooth-shaped spacer (2) is placed in the collection box (3) to divide the inner cavity of the collection box (3) into an upper flow channel and a lower flow channel.

2. The vacuum glass tube collector according to claim 1, characterized in that: The two ends of the collecting box (3) are also provided with an input port (31) and an output port (33), which are respectively connected to the lower flow channel and the upper flow channel in the collecting box (3), and the output port (33) is arranged at the highest point of the end surface.

3. The vacuum glass tube collector according to claim 1, characterized in that: A baffle plate (32) is provided at a certain distance inside the input port (31) of the collecting box (3).

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