Photovoltaic-radiation combined function ventilation duct system

Abstract

The utility model discloses a photovoltaic -radiation composite function ventilation pipeline system relates to radiation refrigeration and photovoltaic power generation technical field, including ventilation pipeline main part, and the both ends of ventilation pipeline main part are rotatablely connected with fixed pipe through swivel joint, and the ventilation pipeline main part is close to the rotation joint on one end and is driven ventilation pipeline main part rotation through conveying mechanism, and the outer wall of ventilation pipeline main part is covered with conversion subassembly, and conversion subassembly includes symmetrical photovoltaic thin film battery layer and radiation refrigeration film layer, and photovoltaic thin film battery layer utilizes the waste heat of power generation and heats the airflow in ventilation pipeline main part, and radiation refrigeration film layer carries out the cooling of airflow in ventilation pipeline main part through the reflection of solar radiation. The utility model discloses simple structure can complete the function switching with lower cost, and simultaneously, still can be with the existing building or new building adaptation all is good, can be widely used in the ventilation pipeline system of top layer or bare outside.

Description

Technical Field

[0001] This utility model relates to the fields of radiation cooling and photovoltaic power generation technology, and in particular to a photovoltaic-radiation composite ventilation duct system. Background Technology

[0002] In residential and public buildings, rooftops often feature numerous exposed ventilation (air supply) ducts, whose internal air conditions mirror the outdoor environment. Integrating radiative cooling films and photovoltaic thin-film solar panels onto the duct surface can effectively utilize natural energy for seasonal pre-cooling or pre-heating of fresh air, thereby reducing building cooling and heating energy consumption. However, this integration presents a seasonal functional conflict: in summer, waste heat generated by the photovoltaic thin-film solar panels heats the air inside the duct, weakening the cooling efficiency of the radiative cooling film; in winter, the radiative cooling film continuously radiates heat to the cold sky, exacerbating heat loss from the duct.

[0003] Current solutions for such seasonal function switching mostly rely on manual operation or additional complex drive mechanisms (e.g., adding a flipping device to a separate radiant panel or photovoltaic panel). This not only increases system complexity, cost, and potential failure points, but also makes seamless integration with the ventilation duct itself difficult. In particular, there is almost no solution specifically designed for integrated rotation of ventilation ducts, lacking a simple, reliable, and highly integrated way to achieve seasonal position swapping of the two functional materials. Utility Model Content

[0004] The purpose of this invention is to provide a photovoltaic-radiation composite ventilation duct system to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a photovoltaic-radiation composite ventilation duct system, including a ventilation duct body. Fixed pipes are rotatably connected to both ends of the ventilation duct body via rotary joints. A transmission mechanism drives the ventilation duct body to rotate at one end near either rotary joint. A conversion component is wrapped around the outer wall of the ventilation duct body, comprising a symmetrically arranged photovoltaic thin-film battery layer and a radiation-cooling thin-film layer. The photovoltaic thin-film battery layer uses the waste heat generated by power generation to heat the airflow within the ventilation duct body; the radiation-cooling thin-film layer cools the airflow within the ventilation duct body by reflecting solar radiation.

[0006] Preferably, the photovoltaic thin-film battery layer and the radiation-cooling thin-film layer are each arranged in a semi-circular shape.

[0007] Preferably, the inner diameters of the photovoltaic thin-film battery layer and the radiation-cooling thin-film layer are equal.

[0008] Preferably, the inner diameters of the photovoltaic thin-film battery layer and the radiation-cooling thin-film layer are adapted to the outer diameter of the ventilation duct body.

[0009] Preferably, the central axis of the ventilation duct body and the central axis of the rotary joint are on the same central axis.

[0010] Preferably, the central axis of the main body of the ventilation duct and the central axis of the fixed pipe are on the same central axis.

[0011] Preferably, the conveying mechanism includes a first pulley sleeved on the main body of the ventilation duct, the first pulley being connected to a second pulley via belt drive, and the second pulley being connected to a drive module via drive drive.

[0012] Preferably, the drive module is a servo motor.

[0013] The present invention discloses the following technical effects:

[0014] This invention involves covering the main body of a ventilation duct with a photovoltaic thin-film battery layer and a radiation-cooling thin-film layer. The ventilation duct is then rotated via a conveying mechanism. When the radiation-cooling thin-film layer is at the top and facing the sunlight, it can effectively reflect solar radiation and pre-cool the air inside the ventilation duct. When the photovoltaic thin-film battery layer is at the top and facing the sunlight, it can effectively utilize solar radiation heat energy to generate electricity and preheat the air inside the ventilation duct. At the same time, since the radiation-cooling thin-film layer is located below the ventilation duct, it effectively prevents heat loss into deep space.

[0015] This invention enables the ventilation duct body to be seasonally rotated 180 degrees through a conveying mechanism, allowing for functional switching at a low cost. Furthermore, it exhibits good compatibility with both existing and new buildings, and can be widely applied to ventilation duct systems on rooftops or exposed surfaces. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the main structure of the ventilation duct of this utility model;

[0019] Figure 3This is a schematic cross-sectional view of the main structure of the ventilation duct of this utility model;

[0020] Figure 4 This is a diagram of the control system of this utility model;

[0021] The components include: 1. Ventilation duct body; 2. Photovoltaic thin-film battery layer; 3. Radiation cooling thin-film layer; 4. Rotary joint; 5. Fixed pipe; 6. Drive module; and 7. Conveying mechanism. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1 to 3 This utility model discloses a photovoltaic-radiation composite ventilation duct system, including a ventilation duct body 1. Fixed pipes 5 are rotatably connected to both ends of the ventilation duct body 1 via rotary joints 4. A transmission mechanism 7 drives the ventilation duct body 1 to rotate at the end closest to either rotary joint 4. A conversion component is wrapped around the outer wall of the ventilation duct body 1, comprising a symmetrically arranged photovoltaic thin-film battery layer 2 and a radiation-cooling thin-film layer 3. The photovoltaic thin-film battery layer 2 uses the waste heat generated by power generation to heat the airflow inside the ventilation duct body 1; the radiation-cooling thin-film layer 3 cools the airflow inside the ventilation duct body 1 by reflecting solar radiation.

[0025] The photovoltaic thin-film battery layer 2 uses thin-film solar cells or solar thin-film batteries.

[0026] Thin-film solar cells are a new type of photovoltaic device for alleviating the energy crisis. They can be manufactured using various inexpensive materials such as ceramics, graphite, and metal sheets as substrates, forming a thin film only a few μm thick to generate voltage. Currently, the highest conversion efficiency can reach 13%. Besides being planar, thin-film solar cells are also flexible enough to be made into non-planar structures, expanding their applications to include integration with buildings or becoming part of the building structure.

[0027] A thin-film solar cell is a device that fabricates a solar cell using a single thin film. Its key features include extremely low silicon usage, making it easier to reduce costs. It is both a high-efficiency energy product and a novel building material, making it easier to integrate with architecture. Thin-film cells utilize thin-layer materials and apply electronic semiconductor and optical principles to convert light energy into electrical energy through the photoelectric effect. A solar thin-film cell mainly consists of a transparent conductive layer, a photosensitive material layer, an electron transport layer, a hole transport layer, and metal electrodes. When sunlight shines on the thin-film cell, photons are absorbed by the photosensitive material layer and excited into electrons. These electrons are collected through the electron transport layer and transmitted to an external circuit, forming an electric current. Simultaneously, holes are collected through the hole transport layer and transmitted to the metal electrodes, forming a circuit with the electrons to complete the photoelectric conversion process. Solar thin-film cells have advantages such as small weight, extremely thin thickness, and flexibility.

[0028] The radiation-cooled thin film layer 3 adopts a passive radiation-cooled coating.

[0029] Passive radiation cooling coating is a type of coating material that achieves cooling without consuming electricity by reflecting sunlight (400-2500 nm band) and radiating heat through the mid-infrared atmospheric window (8-13 μm band). Its core function comes from the synergistic effect of high solar reflectivity (≥94%) and high infrared emissivity (≥90%), which can reduce the surface temperature of objects to below the ambient temperature.

[0030] The passive radiation cooling coating is based on the principle of dual-band optical modulation: it achieves high reflectivity (≥94%) in the solar spectrum (400-2500nm) to reduce solar radiation heat absorption; at the same time, it maintains high emissivity (≥90%) in the mid-infrared atmospheric window (8-13μm) to reduce surface temperature through radiative heat dissipation. This process requires no external energy input and is a zero-energy cooling technology.

[0031] This invention covers the main body of the ventilation duct 1 with a photovoltaic thin-film battery layer 2 and a radiation-cooling thin-film layer 3. Then, the main body of the ventilation duct 1 is rotated by a conveying mechanism 7. When the radiation-cooling thin-film layer 3 is on top and facing the sunlight, it can effectively reflect solar radiation and pre-cool the air inside the ventilation duct 1. When the photovoltaic thin-film battery layer 2 is on top and facing the sunlight, it can effectively utilize solar radiation heat energy to generate electricity and preheat the air inside the ventilation duct 1. At the same time, since the radiation-cooling thin-film layer 3 is below the ventilation duct 1, it effectively prevents heat loss due to heat dissipation into deep space.

[0032] This utility model enables the ventilation duct body 1 to be seasonally rotated 180 degrees through the conveying mechanism 7, which can complete the function switch at a low cost; at the same time, it can be well adapted to both existing and new buildings and can be widely used in ventilation duct systems on the top floor or exposed.

[0033] This invention integrates a photovoltaic thin-film battery layer 2 and a radiation cooling thin-film layer 3 on the outer wall of the ventilation duct body 1, and combines seasonal rotation of the ventilation duct body 1 to utilize solar energy for pre-cooling and preheating of the air inside the ventilation duct body 1, thereby significantly improving the utilization rate of natural energy for cooling and heating.

[0034] The design was further optimized so that the photovoltaic thin-film battery layer 2 and the radiation cooling thin-film layer 3 are respectively arranged in a semi-circle.

[0035] The scheme was further optimized so that the inner diameters of the photovoltaic thin-film battery layer 2 and the radiation cooling thin-film layer 3 are equal.

[0036] By arranging the photovoltaic thin-film battery layer 2 and the radiation-cooling thin-film layer 3 in a semi-circular shape with equal inner diameters, the photovoltaic thin-film battery layer 2 and the radiation-cooling thin-film layer 3 can be spliced ​​into a circle.

[0037] The design was further optimized so that the inner diameters of the photovoltaic thin-film battery layer 2 and the radiation-cooling thin-film layer 3 are matched with the outer diameter of the ventilation duct body 1. This allows the photovoltaic thin-film battery layer 2 and the radiation-cooling thin-film layer 3 to effectively cover the ventilation duct body 1.

[0038] The scheme was further optimized so that the central axis of the main body of the ventilation duct 1 and the central axis of the rotary joint 4 are on the same central axis.

[0039] The scheme was further optimized so that the central axis of the main body of the ventilation duct 1 and the central axis of the fixed pipe 5 are on the same central axis.

[0040] By ensuring that the central axis of the ventilation duct body 1, the central axis of the rotary joint 4, and the central axis of the fixed pipe 5 are all on the same central axis, the ventilation duct body 1 can rotate stably between the two rotary joints 4.

[0041] In a further optimized design, the conveying mechanism 7 includes a first pulley mounted on the main body of the ventilation duct 1. The first pulley is connected to a second pulley via a belt drive, and the second pulley is connected to a drive module 6. The drive module 6 drives the second pulley to rotate, and the second pulley drives the first pulley to rotate via a belt, enabling the first pulley to drive the main body of the ventilation duct 1.

[0042] To further optimize the solution, drive module 6 adopts a servo motor.

[0043] A servo motor is an engine that controls the operation of mechanical components in a servo system; it is a type of auxiliary motor with indirect speed change.

[0044] Servo motors can control speed and have very accurate positioning. They can convert voltage signals into torque and speed to drive the controlled object. The rotor speed of a servo motor is controlled by the input signal and can respond quickly. In automatic control systems, they are used as actuators and have characteristics such as small electromechanical time constant and high linearity. They can convert the received electrical signals into angular displacement or angular velocity output on the motor shaft.

[0045] The working principle of a servo motor: A servo system is an automatic control system that enables the output controlled variables, such as the position, orientation, and state of an object, to follow any changes in the input target (or given value). Servos primarily rely on pulses for positioning. Essentially, a servo motor receives a pulse and rotates by the angle corresponding to that pulse, thus achieving displacement. Because the servo motor itself has the function of generating pulses, it generates a corresponding number of pulses for each rotation angle. This creates a feedback loop, or closed loop, between the pulses received by the servo motor and the pulses sent. In this way, the system knows how many pulses were sent to the servo motor and how many pulses were received, allowing for very precise control of the motor's rotation and achieving precise positioning down to 0.001mm.

[0046] When the radiative cooling film attached to the main body 1 of the ventilation duct is on top, it reflects solar radiation to cool the airflow inside the duct; when the photovoltaic thin-film battery layer attached to the duct is on top, the photovoltaic thin-film battery layer generates electricity and uses the waste heat generated by the electricity generation to heat the air inside the duct, thus achieving seasonal and efficient energy utilization.

[0047] The ventilation duct body 1 is seasonally rotated via a rotary joint 4 and a conveying mechanism 7, allowing it to rotate 180° around the joint 4. This enables the switching of the positions of the photovoltaic thin-film battery layer 2 and the radiative cooling thin-film layer 3, while the building structure beneath the ventilation duct body 1 provides shade to prevent solar radiation. Based on a preset seasonal strategy, the integrated photovoltaic thin-film battery layer 2 and radiative cooling thin-film layer 3 are automatically and reliably switched to their optimal functional positions to maximize seasonal energy savings and ensure the airtightness and operational stability of the ventilation duct system.

[0048] The main body of the ventilation duct 1 should have a circular or near-circular cross-section, with an effective ventilation inner diameter in the range of 300mm to 500mm. The main structure must have sufficient mechanical strength to withstand an external pressure of not less than 2.5kPa without plastic deformation or cracking, and sufficient bending stiffness to support its own weight and the structural integrity of the additional functional layers during the flipping operation.

[0049] The photovoltaic thin-film battery layer 2 is attached to the upper half of the outer wall of the ventilation duct body 1 (relative to the normal installation position of the duct), and is in the form of a thin film with a total thickness of no more than 0.3 mm. This layer must be able to effectively convert sunlight into electrical energy and maintain its basic photoelectric conversion performance and structural stability within an ambient temperature range of -40℃ to +85℃.

[0050] The radiative cooling thin film layer 3 is attached to the lower half of the outer wall of the ventilation duct body 1 (relative to the normal installation position of the duct). This functional layer must meet the following optical performance requirements: (1) It has a hemispherical emissivity of not less than 0.9 in the atmospheric infrared window band (8μm to 13μm). (2) It has a hemispherical reflectivity of not less than 0.85 in the solar spectrum band (0.3μm to 2.5μm). (3) The total thickness of this functional layer is in the range of 50μm to 100μm.

[0051] Rotary joint 4 is installed at both ends of the core functional pipeline section or at key locations along its length, allowing the pipeline section to rotate around its central axis. The joint must meet the following requirements: (1) Its airtightness must be within the system design working pressure range (e.g., the corresponding ventilation system wind pressure), and the gas leakage rate during rotation must not exceed the design allowable value (e.g., ≤1%). (2) The structural strength must be able to withstand the weight of the pipeline section, wind load, and the torque generated by the rotation operation.

[0052] Production process:

[0053] The core functional section of this pipeline system achieves multifunctional integration through a layered composite process. First, a ventilation duct body 1 with a diameter of 300-500mm is manufactured using a metal or polymer substrate that meets mechanical strength requirements (compression resistance ≥2.5kPa). After rolling welding or extrusion molding, functional layer composites are applied: a photovoltaic thin-film battery layer 2 with a thickness ≤0.3mm is applied to the entire outer surface of the ventilation duct body 1. This layer must maintain stable power generation performance in an environment of -40℃ to 85℃. Subsequently, a radiation-cooling thin-film layer 3 is precisely coated on the lower half (180° arc surface) of the ventilation duct body 1. Its optical performance must meet the requirements of an emissivity ≥0.9 in the 8-13μm band and a solar spectral reflectivity ≥0.85, with a thickness controlled within the range of 50-100μm. The inner wall of the ventilation duct body 1 is then sequentially coated with a layer with a thermal resistance value ≥1.5 (m²). 2 The insulation layer (·K) / W and the inner lining layer with a surface roughness Ra≤1.6μm are bonded together using a hot-pressing process to ensure interlayer bonding strength. During the rotation mechanism integration stage, rotary joints 4 with wear-resistant sealing components (air tightness leakage rate ≤1%@2.5kPa) are installed at both ends of the ventilation duct body 1, and electric slip rings are pre-installed. The drive module 4 uses a motor with a torque margin ≥150% of the load and is driven by a gear / synchronous belt. Finally, assembly is completed after optical performance verification, a 3kPa air tightness test (pressure drop ≤3% after 10 minutes), and rotational positioning accuracy calibration (±0.5°).

[0054] Reference Figure 4 The electrical system is responsible for collecting, converting (e.g., DC-DC conversion) the electrical energy generated by the photovoltaic functional layer and transmitting it to the electrical equipment within the system (e.g., drive units, control systems) or to the external power grid / energy storage devices. It must include necessary wiring, connectors, and protective devices (e.g., fuses, lightning protection) to meet electrical safety regulations (e.g., waterproof and dustproof ratings, insulation requirements). The wiring design must accommodate the periodic rotational movement of the conduit section (e.g., using slip rings or sufficiently long flexible cables).

[0055] The control system consists of a temperature sensor, a main control unit, and a drive module 6. The temperature sensor unit must be able to acquire temperature data in real time within an environment range of -40℃ to +85℃, with a measurement error ≤ ±0.5℃. The main control unit must be able to compare temperature thresholds (T1 / T2), generate 180° rotation commands and position locking signals, and have limit status diagnosis and drive overload protection functions. The drive module 6 must have an output torque margin ≥ 150% of the maximum load (including pipe weight / wind resistance / icing conditions, etc.); the time required to rotate the pipe 180° must be ≤ t seconds (t is a preset threshold), and it must be able to receive control system commands and execute ±0.5° accuracy angle positioning. The transmission mechanism of the drive module 6 must meet the requirement of no slippage transmission under 150% maximum load torque, ensuring pipe rotation positioning accuracy ≤ ±0.5°. The orientation locking module must provide dual-position mechanical positioning at 0° and 180°, with an error ≤ ±0.5° and a lifespan ≥ 100,000 cycles. The airtight rotation module must have a gas leakage rate ≤ 1% under a working pressure of 2.5 kPa.

[0056] Operating mechanism:

[0057] The operating mode is determined based on the outdoor ambient temperature: In summer mode, the radiative cooling film layer 3 is located at the upper part of the ventilation duct body 1. The radiative cooling film layer 3 radiates heat into deep space, making the outer wall temperature of the ventilation duct body 1 lower than the ambient temperature. The air flowing through the ventilation duct body 1 is cooled and then sent into the room. At the same time, the speed of the duct fan is dynamically adjusted according to the radiation intensity.

[0058] In winter mode, the controller activates the rotation mechanism to rotate the duct 180°. The photovoltaic thin-film battery layer 2 is located at the upper part of the ventilation duct body 1 and can be connected to heating modules such as heaters. At the same time, the waste heat generated by the photovoltaic thin-film battery layer 2 preheats the air inside the ventilation duct body 1. At this time, the radiative cooling thin-film layer 3 is located at the lower layer and is blocked by the structure of the ventilation duct body 1 itself or building components to avoid reverse heat absorption.

[0059] Transitional Season Mode Teleportation Mechanism 7 maintains its summer or winter position (based on the most recent mode switch memory).

[0060] During extreme summer conditions, the control fan enhances airflow within the pipes, increasing cooling capacity; during extreme winter conditions, the heating module works in conjunction with the photovoltaic system to achieve deep energy storage discharge.

[0061] Operation control strategy:

[0062] The control system triggers a three-level operating mode based on the ambient temperature threshold: when the temperature is ≥T1, the summer mode is activated, and the drive unit rotates the pipe 180° within ≤t seconds so that the radiative cooling film layer 3 faces upward (positioning accuracy ±0.5°). After the electromagnetic latch locks, the photovoltaic direct-drive fan is started; at this time, the radiative cooling film layer 3 dissipates heat to deep space, and the fan speed is dynamically adjusted according to solar radiation (it is recommended to increase the speed by 100W / m). 2 (Speed ​​increase by 10%); if the ambient temperature ≥ T2, start the ≤50W standby fan to enhance surface convection and increase cooling capacity by 15%-20%. When the temperature ≤10℃, switch to winter mode, the pipe is rotated 180° in the reverse direction so that the photovoltaic thin-film battery layer 2 faces upward, the heating module uses photovoltaic power to preheat the air, and the outlet temperature is stabilized at T3-T4℃ through PID algorithm, and the power supply is executed according to the priority of photovoltaic → energy storage (SOC≥20%) → grid; if the temperature ≤T1'

[0063] The stored energy is allowed to discharge to SOC = 20%. When the temperature is between T2 and T1, the transitional season mode is activated, the heating module is turned off and only basic ventilation is maintained, and the main body of the ventilation duct remains in the state of the most recent seasonal mode. Throughout the process, the duct position, temperature output and energy storage status are monitored in real time through the human-machine interface. Mechanical limit switches (0° / 180°±0.5°) and drive units with a torque margin of ≥150% ensure safe operation. Abnormal operating conditions (limit switch failure / motor overload) trigger audible and visual alarms.

[0064] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A photovoltaic-radiation composite ventilation duct system, characterized in that: It includes a ventilation duct body (1), and fixed pipes (5) are rotatably connected to both ends of the ventilation duct body (1) through rotary joints (4). The ventilation duct body (1) is driven to rotate by a transmission mechanism (7) at one end of the ventilation duct body (1) near any of the rotary joints (4). The outer wall of the ventilation duct body (1) is covered with a conversion component, which includes a symmetrically arranged photovoltaic thin-film battery layer (2) and a radiation cooling thin-film layer (3); The photovoltaic thin-film battery layer (2) uses the waste heat generated by power generation to heat the airflow inside the ventilation duct body (1); The radiation cooling film layer (3) cools the airflow inside the ventilation duct body (1) by reflecting solar radiation.

2. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The photovoltaic thin-film battery layer (2) and the radiation-cooling thin-film layer (3) are respectively arranged in a semi-circular shape.

3. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The inner diameters of the photovoltaic thin-film battery layer (2) and the radiation-cooling thin-film layer (3) are equal.

4. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The inner diameters of the photovoltaic thin-film battery layer (2) and the radiation cooling thin-film layer (3) are adapted to the outer diameter of the ventilation duct body (1).

5. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The central axis of the ventilation duct body (1) and the central axis of the rotary joint (4) are on the same central axis.

6. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The central axis of the ventilation duct body (1) and the central axis of the fixed pipe (5) are on the same central axis.

7. The photovoltaic-radiation composite ventilation duct system according to claim 1, characterized in that: The conveying mechanism (7) includes a first pulley sleeved on the ventilation duct body (1), the first pulley is connected to a second pulley via belt drive, and the second pulley is connected to a drive module (6).

8. The photovoltaic-radiation composite ventilation duct system according to claim 7, characterized in that: The drive module (6) uses a servo motor.

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