Heat pipe type vacuum pipe solar heat collection system
By using heat pipe vacuum tubes and nanofluid phase change materials in solar thermal collecting systems, the problems of heat loss and low heat collection efficiency in traditional systems are solved, and efficient, freezing and long-life solar thermal collecting effects are achieved.
Patent Information
- Application Number
- CN202411754848.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-02-11
AI Technical Summary
Traditional solar heat collectors have low thermal conductivity and large thermal resistance between solid and liquid, resulting in large heat loss and low heat collection efficiency.
The heat pipe vacuum tube solar heat collection system is adopted, including the vacuum tube heat collection system, smart terminal and water heater. The heat collector is designed with heat pipes and nanofluid phase change materials to enhance heat exchange performance and monitor temperature changes in real time through the smart terminal.
It improves thermal efficiency, reduces heat loss, enhances freezing resistance and service life, is suitable for cross-season use, and improves the overall operating efficiency of the system.
Smart Images
Figure CN119412807A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of solar energy utilization, in particular to a heat pipe type vacuum tube solar energy heat collection system. Background Art
[0002] As a clean and renewable energy source, solar energy has the characteristics of high energy density, but its development is hindered by key issues such as instability and intermittency. In recent years, the development of solar collector technology has attracted much attention, among which vacuum tube collectors are more widely used due to their high thermal efficiency and low maintenance cost.
[0003] Traditional solar collectors usually use transparent glass vacuum tubes as insulation devices, use absorption coatings to absorb solar heat, and transfer heat to the working medium water. However, due to the low thermal conductivity of water and the large thermal resistance between solid and liquid, the heat loss is large and the heat collection efficiency is low.
[0004] Therefore, a heat pipe vacuum tube solar thermal collection system is proposed. Summary of the invention
[0005] The object of the present invention is to provide a heat pipe type vacuum tube solar energy heat collection system.
[0006] To achieve the above object, the present invention provides the following technical solutions:
[0007] A heat pipe type vacuum tube solar thermal collection system proposed in the present invention comprises a vacuum tube thermal collection system, an intelligent terminal and a water heater. The vacuum tube thermal collection system consists of a water collection device, a supporting device and a collector. The collector comprises a heat pipe. The intelligent terminal is used to collect temperature information in the vacuum tube thermal collection system to facilitate monitoring of temperature changes at any time. Six thermal sensors are arranged in the vacuum tube thermal collection system, namely, thermal sensor T1, thermal sensor T2, thermal sensor T3, thermal sensor T4, thermal sensor T5 and thermal sensor T6. The inlet and outlet water temperatures of the vacuum tube thermal collection system are measured by thermal sensor T1 and thermal sensor T2, the heat pipe temperature is measured by the average value of thermal sensor T3, thermal sensor T4 and thermal sensor T5, and the PCM temperature of the heat pipe is measured by thermal sensor T6.
[0008] Preferably, the water collecting device comprises a cold water tank and a bracket, the cold water in the collector is supplied by the cold water tank, and the cold water tank is fixed on the bracket.
[0009] Preferably, a speed regulating valve and a check valve are provided on the water inlet pipe of the cold water tank, and a throttle valve and a water flow meter are provided on the water outlet pipe of the cold water tank.
[0010] Preferably, the supporting device is a metal frame, and the collector is installed on the metal frame, inclined at 45° to the horizontal plane. The collector also includes an outer tube, an inner tube, a heat pipe evaporator, a vacuum tube, a heat pipe condenser in the water heater, and a manifold. The inner tube is in the outer tube, the two are concentric to form concentric tubes, and both are made of borosilicate glass. The concentric tubes are insulated as a whole, the heat pipe is in the inner tube, the end of the heat pipe is connected to the vacuum tube, and the side wall is connected to the manifold, and the heat pipe evaporator is in the concentric tube.
[0011] Preferably, the outer tube has a diameter of 90 mm, the inner tube has a diameter of 60 mm, and the thickness of both the outer tube and the inner tube is 5 mm.
[0012] Preferably, the inner tube also has a geometric heat sink, which is fixed to the heat pipe.
[0013] Preferably, the heat sink is 1350 mm long, 35 mm in diameter, and 1.2 mm thick, and is coaxially arranged with the inner tube. The heat pipe and the heat sink are both made of copper. The heat pipe is 200 mm long, 6 mm in diameter, and 0.7 mm thick.
[0014] Preferably, the heat pipe evaporator has a diameter of 10 mm, a thickness of 0.8 mm, and a length of 1600 mm, and the heat pipe condenser has a diameter of 16 mm, a length of 140 mm, and a thickness of 0.9 mm.
[0015] Preferably, the working fluid of the PCM of the heat pipe is stearic acid (SA-67) with a chemical formula (C18H36O2), and the heat pipe uses graphene nanoparticles in an acetone-based liquid with a chemical formula (C3H6O).
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] The present invention is provided with a vacuum tube heat collection system in the form of an inner and outer tube double tube, and uses the heat-absorbing coating of the inner tube to utilize sunlight, so it has high thermal efficiency, strong antifreeze ability, no water leakage risk, long service life, and is suitable for cross-season use; the intelligent terminal can collect corresponding temperature information at any time, detect temperature changes, save labor, and improve the overall operation efficiency of the system; a specific geometric shape is designed in the heat pipe, and nanofluid phase change material is used to enhance heat exchange performance, effectively reduce heat loss, and further improve energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the structure of the heat collector of the present invention;
[0019] Figure 2 It is an overall schematic diagram of the vacuum tube solar thermal collection system of the present invention;
[0020] Figure 3 A schematic diagram of the fluid flow direction of the heat pipe of the present invention;
[0021] Figure numerals: 1. speed regulating valve; 2. check valve; 3. cold water tank; 4. bracket; 5. throttle valve; 6. collector; 7. water flow meter; 8. metal frame; 9. water heater; 10. intelligent terminal; 61. outer tube; 62. inner tube; 63. heat pipe; 64. heat sink; 631. heat pipe evaporator; 632. vacuum tube; 633. heat pipe condenser; 634. manifold. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] A heat pipe type vacuum tube solar thermal collection system proposed in the present invention comprises an empty tube thermal collection system, an intelligent terminal 10 and a heat pipe 63. The intelligent terminal 10 is used to collect temperature information in the vacuum tube thermal collection system, so as to monitor the temperature change at any time. Six thermal sensors are arranged in the vacuum tube thermal collection system, the inlet and outlet water temperatures are measured by thermal sensors T1 and T2 respectively, the heat pipe temperature is measured by the average value of thermal sensors T3, T4 and T5, and the PCM temperature is measured by thermal sensor T6.
[0024] In the above scheme, referring to Figure 2, the vacuum tube heat collection system is composed of valves, a water collection device, a support device and a heat collector 6. The cold water in the heat collector 6 is supplied by a cold water tank 3, which is fixed on a bracket 4. Furthermore, the flow rate is controlled by gravity and the size of the valve.
[0025] In some possible implementation schemes, a speed regulating valve 1 is provided in front of the cold water tank 3 to store water, and a pressure compensation device is added to the internal structure of the speed regulating valve 1 to eliminate the influence of load changes on the flow rate. Furthermore, a check valve 2 is provided to prevent the backflow of the fluid and also to prevent the escape of compressed air.
[0026] In the above scheme, a throttle valve 5 is arranged behind the cold water tank 3, and the throttle valve 5 is used to adjust the flow rate of the fluid and control the pressure of the fluid to a certain extent.
[0027] It should be noted that a water flow meter 7 is provided after the throttle valve 5 , and the water flow meter 7 is used to measure the water flow in the channel to provide a suitable flow into the collector 6 .
[0028] In the above scheme, the collector 6 assembly is mounted on a metal frame 8, tilted at 45° to the horizontal plane. The collector 6 is composed of concentric tubes of an outer tube 61 and an inner tube 62, which are made of borosilicate glass. The concentric tubes are insulated as a whole, wherein the outer tube has a diameter of 90 mm, the inner tube has a diameter of 60 mm, and the thickness is 5 mm.
[0029] It should be noted that, referring to Figure 1, the inner tube 62 is a heat pipe 63. Further, in order to enhance the heat transfer of the evaporation section, a heat sink 64 with a specific geometric shape is used and fixed on the heat pipe 63. The heat sink is 1350 mm long, 35 mm in diameter, and 1.2 mm thick, and is coaxially arranged with the inner glass tube. Further, the heat pipe 63 and the heat sink 64 are both made of copper.
[0030] In some possible implementations, referring to Figure 3, the heat pipe 63 is 200 mm long, 6 mm in diameter, and 0.7 mm thick, and is used to connect the vacuum tube 632 at the lower end of the collector 6. Furthermore, the fluid in the heat pipe 63 flows in the direction of the arrow and passes through the manifold 634 on the right side.
[0031] In the above scheme, the heat pipe 63 is composed of a heat pipe evaporator 631 and a heat pipe condenser 633. Further, the heat pipe evaporator 631 has a diameter of 10 mm, a thickness of 0.8 mm, and a length of 1600 mm, and is located in the concentric glass tube. The heat pipe condenser 633 has a diameter of 16 mm, a length of 140 mm, and a thickness of 0.9 mm, and is located in the water heater 9.
[0032] It should be noted that, in order to enhance the heat exchange performance in the heat pipe 63, the present invention uses phase change material (PCM) for energy storage, and the working fluid used is stearic acid (SA-67) with a chemical formula (C18H36O2). Further, nanofluid particles are added to improve thermal efficiency, and the working fluid used is graphene nanoparticles in an acetone-based liquid with a chemical formula (C3H6O).
[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A heat pipe vacuum tube solar heat collection system, characterized in that: The invention comprises a vacuum tube heat collection system, an intelligent terminal (10) and a water heater (9). The vacuum tube heat collection system comprises a water collection device, a support device and a heat collector (6). The heat collector (6) comprises a heat pipe (63). The intelligent terminal (10) is used to collect temperature information in the vacuum tube heat collection system so as to monitor temperature changes at any time. Six heat sensors are arranged in the vacuum tube heat collection system, namely, a heat sensor T1, a heat sensor T2, a heat sensor T3, a heat sensor T4, a heat sensor T5 and a heat sensor T6. The water inlet and water outlet temperatures of the vacuum tube heat collection system are measured by the heat sensor T1 and the heat sensor T2. The temperature of the heat pipe (63) is measured by the average value of the heat sensor T3, the heat sensor T4 and the heat sensor T5. The PCM temperature of the heat pipe (63) is measured by the heat sensor T6.
2. The heat pipe vacuum tube solar thermal collection system according to claim 1, characterized in that: The water collecting device comprises a cold water tank (3) and a bracket (4); the cold water in the heat collector (6) is supplied by the cold water tank (3); and the cold water tank (3) is fixed on the bracket (4).
3. The heat pipe vacuum tube solar thermal collection system according to claim 2, characterized in that: A speed regulating valve (1) and a check valve (2) are arranged on the water inlet pipe of the cold water tank (3), and a throttle valve (5) and a water flow meter (7) are arranged on the water outlet pipe of the cold water tank (3).
4. The heat pipe vacuum tube solar thermal collection system according to claim 1, characterized in that: The supporting device is a metal frame (8), and the collector (6) is installed on the metal frame (8) and is inclined at 45 degrees to the horizontal plane. The collector (6) also includes an outer tube (61), an inner tube (62), a heat pipe evaporator (631), a vacuum tube (632), a heat pipe condenser (633) in the water heater (9), and a manifold (634). The inner tube (62) is in the outer tube (61), and the two are concentric to form a concentric tube. Both are made of borosilicate glass. The concentric tube is insulated as a whole. The heat pipe (63) is in the inner tube (62), the end of the heat pipe (63) is connected to the vacuum tube (632), and the side wall is connected to the manifold (634). The heat pipe evaporator (631) is in the concentric tube.
5. The heat pipe vacuum tube solar thermal collection system according to claim 4, characterized in that: The outer tube (61) has a diameter of 90 mm, the inner tube (62) has a diameter of 60 mm, and the thickness of both the outer tube (61) and the inner tube (62) is 5 mm.
6. The heat pipe vacuum tube solar thermal collection system according to claim 4, characterized in that: The inner tube (62) also has a geometrically shaped heat sink (64), and the heat sink (64) is fixed to the heat pipe (63).
7. The heat pipe vacuum tube solar thermal collection system according to claim 6, characterized in that: The heat sink (64) has a length of 1350 mm, a diameter of 35 mm, and a thickness of 1.2 mm, and is coaxially arranged with the inner tube (62). The heat pipe (63) and the heat sink (64) are both made of copper. The heat pipe (63) has a length of 200 mm, a diameter of 6 mm, and a thickness of 0.7 mm.
8. The heat pipe vacuum tube solar thermal collection system according to claim 4, characterized in that: The heat pipe evaporator (631) has a diameter of 10 mm, a thickness of 0.8 mm, and a length of 1600 mm, and the heat pipe condenser (633) has a diameter of 16 mm, a length of 140 mm, and a thickness of 0.9 mm.
9. The heat pipe vacuum tube solar thermal collection system according to claim 1, characterized in that: The working fluid of the PCM of the heat pipe (63) is stearic acid (SA-67) with a chemical formula (C18H36O2), and the heat pipe (63) uses graphene nanoparticles in an acetone-based liquid with a chemical formula (C3H6O).