A transport vehicle cooling compartment system based on a radiation refrigeration film

Abstract

The utility model relates to the technical field of cold chain transportation, and specifically discloses a transport vehicle cooling compartment system based on a radiation refrigeration film, which comprises: a transport vehicle, wherein the transport vehicle comprises a transport vehicle compartment; and a radiation refrigeration film, which is located above the transport vehicle compartment and is used to improve the heat dissipation efficiency of the transport vehicle compartment. The transport vehicle cooling compartment system based on the radiation refrigeration film can effectively solve the problem of high refrigeration cost of the existing vehicle compartment.

Description

Technical Field

[0001] This utility model relates to the field of cold chain transportation technology, and in particular to a cooling compartment system for a transport vehicle based on a radiation cooling film. Background Technology

[0002] As one of the main modes of transportation in my country, truck transportation has seen increasing demand driven by the country's sustained and steady economic growth, accelerated urbanization, and the rapid development of manufacturing, e-commerce, and other industries. However, relevant data shows that the loss rate of agricultural products during transportation in my country is extremely high. The loss rate for meat reaches 12%, for aquatic products as high as 15%, and for fruits and vegetables as high as 20% to 30%. Every year, the loss of vegetables and fruits during cold chain transportation in my country exceeds 100 billion yuan. This not only causes significant losses for logistics companies but also results in substantial food waste. Maintaining suitable temperatures during transportation to better protect transported goods has become a key issue in improving the capacity of truck transportation.

[0003] Currently, the most common types of transport trucks are box trucks and stake trucks. Box trucks are more commonly used for transporting fruits and vegetables, while stake trucks are more often used for livestock and poultry. Taking the transport of piglets as an example, in the hot summer, temperatures in most areas can reach above 35℃. Pigs have underdeveloped sweat glands and mainly dissipate heat through respiration and radiation from their skin. If they are exposed to temperatures of 35-37℃ for a prolonged period, they will suffer from heatstroke. During long-distance transport, the cramped and poorly ventilated space of the truck, coupled with the high temperature and humidity, makes pigs extremely susceptible to heatstroke. If they are not cooled down in time, they may die within 2 to 3 hours. Pathogenic microorganisms in pigs that die from heatstroke will multiply rapidly and produce toxins. Consuming such pork may cause food poisoning and even endanger their lives.

[0004] In fruit and vegetable transportation, while some advanced cold chain transportation technologies are used, they have certain drawbacks. The most prominent problem is the high cost of refrigeration, resulting in cold chain transportation costs being 40% to 60% higher than ordinary logistics. According to international standards, the logistics cost of food should not exceed 50% of the total food cost. However, because most cold chain logistics companies in my country use relatively traditional transportation equipment and cold storage facilities, many fresh food cold chain logistics still use ice packs for insulation, or even traditional cotton quilts. The unstable preservation performance provided by these methods greatly increases the loss rate of food during transportation, leading to significant food spoilage. Currently, food transportation logistics costs in my country exceed 70% of the total food cost, which not only adds more costs to agricultural products but also reduces the market competitiveness of businesses. Surveys indicate that the annual loss of fruits and vegetables during cold chain transportation in my country alone exceeds 100 billion yuan. Inefficient transportation insurance technologies not only cause significant losses to logistics companies but also result in substantial food waste. Currently, there is a lack of automotive transportation products designed with highly efficient insulation and even cooling materials. In transporting livestock and poultry, the traditional practice is to use shade nets or cold water rinsing at service areas along the route to physically cool them. Shade nets are affordable and easy to use, but their cooling effect is quite limited; while they provide some shade, their temperature control is poor. Cold water rinsing can achieve faster cooling, but in hot weather, the moisture evaporates quickly, making the cooling effect short-lived. Furthermore, most service areas do not offer this rinsing service, which also affects transport efficiency to some extent.

[0005] Therefore, this utility model is dedicated to improving existing carriages to solve the problem of high refrigeration costs.

[0006] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] One objective of this invention is to provide a cooling system for a transport vehicle body based on a radiation cooling film, which can effectively solve the problem of high refrigeration costs in existing transport vehicles.

[0008] To achieve the above objectives, this utility model provides a cooling system for a transport vehicle body based on a radiative cooling film, comprising:

[0009] A transport truck, the transport truck including a transport compartment;

[0010] A radiative cooling film is located above the transport compartment to improve the heat dissipation efficiency of the transport compartment.

[0011] Optionally, it also includes a rotating folding bracket installed on the transport vehicle to support the radiative cooling film.

[0012] Optional,

[0013] The rotating folding support includes several inverted U-shaped support rods, each inverted U-shaped support rod including a first vertical rod with its lower end installed on one side of the transport vehicle, a second vertical rod with its lower end installed on the other side of the transport vehicle, and a horizontal rod connecting the upper ends of the two vertical rods;

[0014] The radiation cooling film is fixed to the top of each of the crossbars.

[0015] Optionally, the lower end of each of the first vertical rods is rotatably connected to one side of the transport vehicle, and the lower end of each of the second vertical rods is rotatably connected to the other side of the transport vehicle.

[0016] Each of the inverted U-shaped support rods has a covering state in which it rotates to separate from each other, causing the radiative cooling film to unfold above the transport vehicle; and a folded state in which it rotates to bring itself closer to each other, causing the radiative cooling film to gather above the transport vehicle.

[0017] Optionally, it also includes an electric winding assembly installed on the transport vehicle for winding the radiation-cooling film and for pulling out the wound radiation-cooling film.

[0018] Optionally, the electric winding assembly includes:

[0019] A take-up roller is installed at one end of the transport vehicle, and one end of the radiation cooling film is wound and fixed on the take-up roller;

[0020] A direct-drive module, located above the transport vehicle and connected to the other end of the radiative cooling film, is used to pull the radiative cooling film out of the take-up roller.

[0021] Optionally, the take-up roller is a spring-driven take-up structure or an electric take-up structure.

[0022] Optionally, the direct drive module includes:

[0023] A transverse rotating shaft is provided, which is parallel to the take-up roller, and the other end of the radiation cooling film is fixed to the transverse rotating shaft.

[0024] A linear drive mechanism is installed on the side of the transverse rotating shaft to drive the transverse rotating shaft to move closer to or away from the take-up roller along the length of the transport carriage.

[0025] Optionally, the radiative cooling film is attached and fixed to the top of the transport vehicle.

[0026] The beneficial effects of this utility model are as follows: It provides a cooling body system for a transport vehicle based on a radiative cooling film. The radiative cooling film is set above the transport vehicle body. By utilizing the high reflectivity of the radiative cooling film in the solar radiation band and the high emissivity in the atmospheric window band, passive cooling can be achieved without external energy supply.

[0027] This radiative cooling film can reflect most of the sunlight to reduce heat absorption by the compartment, while radiating heat outward through the atmospheric window band (8-13μm) to enhance heat dissipation, thereby effectively improving the heat dissipation efficiency of the transport compartment.

[0028] Compared to traditional cooling methods that rely on active cooling devices or shade nets, the vehicle cooling compartment system based on a radiative cooling film provided in this embodiment directly reduces the compartment temperature through a physical heat dissipation mechanism, avoiding the high energy consumption problem of refrigeration equipment. At the same time, it overcomes the defect that shade nets can only block sunlight but cannot enhance heat dissipation. It fundamentally solves the problem in the background technology of excessively high cold chain logistics costs and severe thermal damage to goods due to the high operating cost of refrigeration systems.

[0029] Therefore, the vehicle cooling compartment system based on radiation cooling film provided by this utility model can effectively solve the problem of high cost of existing vehicle compartment cooling. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0031] Figure 1 A schematic diagram of the overall cooling compartment system for a transport vehicle based on a radiative cooling film provided by this utility model;

[0032] Figure 2 A schematic diagram of the cooling compartment system of the transport vehicle with the rotating folding mechanism provided in Example 1 (in the folded state).

[0033] Figure 3 A schematic diagram of the cooling compartment system of the transport vehicle with the rotating folding mechanism provided in Example 1 (in the unfolded state).

[0034] Figure 4 This is a schematic diagram of the cooling compartment system of the transport vehicle with a roll-up structure provided in Example 2;

[0035] Figure 5 The light intensity and humidity curves are for application example 1.

[0036] Figure 6 The following is a comparison chart of the car body temperature in Application Example 1 (squares represent ambient temperature, triangles represent the temperature of the car body with a film covering, and circles represent the temperature of the car body without a film covering).

[0037] Figure 7 This is a line graph showing the temperature difference between the two carriages of Model A and Model B in Application Example 1 (temperature of the carriage without film wrapping minus temperature of the carriage with film wrapping).

[0038] Figure 8 The light intensity and humidity curves are for application example 2.

[0039] Figure 9 The following is a comparison chart of the car body temperature in Application Example 2 (squares represent ambient temperature, triangles represent the temperature of the car body with a film covering, and circles represent the temperature of the car body without a film covering).

[0040] Figure 10 This is a line graph showing the temperature difference between the two carriages of Model A and Model B in Application Example 2 (temperature of the carriage without film wrapping minus temperature of the carriage with film wrapping).

[0041] Figure 11 The light intensity and humidity curves are for application example 3.

[0042] Figure 12 The following is a comparison chart of the car body temperature in application example 3 (squares represent ambient temperature, triangles represent the temperature of the car body with a film covering, and circles represent the temperature of the car body without a film covering).

[0043] Figure 13 This is a line graph showing the temperature difference between the two carriages of Model A and Model B in Application Example 3 (temperature of the carriage without film wrapping minus temperature of the carriage with film wrapping).

[0044] Figure 14 The light intensity and humidity curves are for application example 4.

[0045] Figure 15 The following is a comparison chart of the car body temperature in application example 4 (squares represent ambient temperature, triangles represent the temperature of the car body with a film covering, and circles represent the temperature of the car body without a film covering).

[0046] Figure 16This is a line graph showing the temperature difference between the two carriages of Model A and Model B in Application Example 4 (temperature of the carriage without film wrapping minus temperature of the carriage with film wrapping).

[0047] In the picture:

[0048] 1. Transport truck; 101. Transport compartment;

[0049] 2. Radiative cooling film;

[0050] 3. Rotating folding bracket; 301. Inverted U-shaped support rod;

[0051] 4. Electric winding assembly; 401. Winding roller; 402. Direct drive module; 4021. Transverse rotating shaft; 4022. Linear drive mechanism. Detailed Implementation

[0052] In this utility model, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0053] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0054] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0055] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0056] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0057] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0058] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0059] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0060] This invention provides a cooling system for transport vehicles based on a radiative cooling film, which is suitable for cold chain logistics and cargo transportation in high-temperature environments. By passively reflecting sunlight and radiating heat through the radiative cooling film, it solves the problems of high energy consumption, high operating costs, and heat damage to goods caused by the inability of shade nets to actively dissipate heat in traditional refrigeration equipment.

[0061] See Figure 1 The radiant cooling film transport vehicle cooling body system provided by this utility model includes:

[0062] A transport truck 1, wherein the transport truck 1 includes a transport compartment 101;

[0063] A radiative cooling film 2 is located above the transport compartment 101 to improve the heat dissipation efficiency of the transport compartment 101.

[0064] It should be noted that the radiation-cooling film 2 is a functional material that achieves passive cooling through specific spectral modulation. Its core principle lies in simultaneously possessing high reflectivity to solar radiation and strong radiation characteristics in the atmospheric window band. Specifically:

[0065] (1) High reflectivity in solar radiation band (0.3-2.5μm):

[0066] Generally speaking, this film has a reflectivity of >90% in the visible and near-infrared bands, which can directly reflect more than 90% of the energy in sunlight back to the atmosphere, significantly reducing the absorption of solar heat on the surface of the transport compartment 101 and suppressing temperature rise from the source.

[0067] (2) High emission in the atmospheric window band (8-13μm):

[0068] In the far-infrared band (especially the 8-13μm "atmospheric transparent window"), this material typically has an infrared emissivity of >95%, which can radiate the heat inside the compartment and the membrane itself outward in the form of electromagnetic waves to reduce the temperature of the compartment.

[0069] (3) Passive cooling mechanism:

[0070] This dual characteristic allows the radiative cooling film 2 to reduce heat input during the day by reflecting sunlight without the need for electricity, while continuously radiating heat energy outwards, achieving a net cooling effect throughout the day. Compared to the limitations of traditional active cooling equipment that relies on compressor power consumption or shading nets that only block sunlight, it directly breaks the local thermal balance through physical optical principles, fundamentally reducing the heat load on the carriage and avoiding energy consumption and operating costs.

[0071] Specifically, the specific structure and principle of the radiation cooling film 2 belong to the prior art. Companies such as Ningbo Ruiling New Energy Technology Co., Ltd., China Construction Southwest Institute Photonics Technology Co., Ltd., Blue Era, and Moguang New Energy Technology (Suzhou) Co., Ltd. have all produced and applied it. This utility model will not elaborate on the specific structure and working principle of the radiation cooling film 2.

[0072] The radiative cooling film transport vehicle cooling compartment system provided in this embodiment sets the radiative cooling film 2 above the transport compartment 101. By utilizing the high reflectivity of the radiative cooling film 2 in the solar radiation band and the high emissivity in the atmospheric window band, passive cooling can be achieved without external energy supply.

[0073] The radiative cooling film 2 can reflect most of the sunlight to reduce the heat absorption of the compartment, while radiating heat outward through the atmospheric window band (8-13μm) to enhance heat dissipation, thereby effectively improving the heat dissipation efficiency of the transport compartment 101.

[0074] Compared to traditional cooling methods that rely on active cooling devices or shade nets, the radiative cooling film-based cooling system for transport vehicles provided in this embodiment directly reduces the temperature of the cargo compartment through a physical heat dissipation mechanism. This avoids the high energy consumption problem of refrigeration equipment and overcomes the limitation of shade nets, which can only block sunlight but cannot enhance heat dissipation. Essentially, it solves the problems in the prior art where the high operating cost of refrigeration systems leads to excessively high cold chain logistics costs and severe thermal damage to goods. Furthermore, even during transport, efficient cooling can still be achieved, greatly increasing the cooling time and reducing the limitations of cooling operation conditions.

[0075] Therefore, the radiative cooling film cooling system for transport vehicles provided by this utility model can effectively solve the problem of high refrigeration costs in existing vehicle compartments.

[0076] Optionally, the radiative cooling film 2 is attached and fixed to the top of the transport compartment 101. Alternatively, as described in the following embodiments, it is made into a component and disposed above the transport compartment 101 by means of a rotating folding bracket 3 or an electric pull-roll assembly 4.

[0077] Next, with reference to the accompanying drawings, various embodiments of the radiative cooling film transport vehicle cooling compartment system of this utility model will be described.

[0078] Example 1

[0079] See Figure 2 and Figure 3 This embodiment provides a radiant cooling film-based cooling system for a transport vehicle's cooling compartment, comprising:

[0080] A transport truck 1, wherein the transport truck 1 includes a transport compartment 101;

[0081] A radiative cooling film 2 is located above the transport compartment 101 to improve the heat dissipation efficiency of the transport compartment 101.

[0082] A rotating folding support 3 is installed on the transport compartment 101 and is used to support the radiative cooling film 2.

[0083] In this embodiment, the rotating folding bracket 3 includes a plurality of inverted U-shaped support rods 301. Each inverted U-shaped support rod 301 includes a first vertical rod with its lower end installed on one side of the transport carriage 101, a second vertical rod with its lower end installed on the other side of the transport carriage 101, and a horizontal rod connecting the upper ends of the two vertical rods.

[0084] The radiation cooling film 2 is fixed to the top of each of the crossbars.

[0085] Furthermore, the lower end of each of the first vertical rods is rotatably connected to one side of the transport carriage 101, and the lower end of each of the second vertical rods is rotatably connected to the other side of the transport carriage 101.

[0086] Each of the inverted U-shaped support rods 301 has a covering state in which it rotates to separate from each other, so that the radiative cooling film 2 is spread out above the transport compartment 101; and a folded state in which it rotates to bring itself closer to each other, so that the radiative cooling film 2 is gathered above the transport compartment 101.

[0087] The rotating folding bracket 3 provided in this embodiment operates as follows:

[0088] (1) Unfolded state (covered state)

[0089] When the cooling function needs to be activated, the first and second vertical rods of each inverted U-shaped support rod 301 rotate about the rotation connection points on both sides of the transport car 101 in the direction of the rear of the vehicle until the adjacent support rods separate from each other and the plane formed by the top of the crossbar covers the top of the car.

[0090] The radiative cooling film 2 is fully deployed under the traction of the crossbar, forming a continuous heat dissipation surface covering the top of the carriage. It can not only directly reflect sunlight and radiate heat, but also improve the cooling speed inside the transport carriage 101 by utilizing the passive cooling characteristics of the radiative cooling film 2.

[0091] (2) Folded state

[0092] When cooling is not required (such as at night or in rainy weather) or when wind resistance needs to be reduced, the vertical bars of each inverted U-shaped support rod 301 rotate and retract towards the front of the vehicle, causing the horizontal bars and their fixed radiative cooling film 2 to fold towards the front of the vehicle.

[0093] During the folding process, the radiative cooling membrane 2 is constrained by the support rod to form an orderly fold, avoiding wear or tear caused by random stacking of the membrane material. Finally, it gathers at the top of the carriage near the front of the vehicle, significantly reducing the windward area.

[0094] In summary, the radiative cooling film-based vehicle cooling compartment system provided in this embodiment has the following advantages:

[0095] ① High reflectivity and high emission radiation cooling film 2: By reflecting sunlight and radiating heat, passive cooling is achieved without external energy, significantly reducing energy consumption and operating costs.

[0096] ② Rotary folding bracket 3 design: adopts an inverted U-shaped support rod 301 structure to achieve full coverage heat dissipation when the radiative cooling film 2 is unfolded and low wind resistance protection when folded, reducing driving resistance and film material wear.

[0097] ③ All-weather passive heat dissipation mechanism: Breaking the thermal balance through physical optics principles to achieve continuous net cooling day and night, reducing thermal damage to goods.

[0098] ④ Flexible adaptation to environmental requirements: The membrane material state (unfolding / folding) can be adjusted according to weather or working conditions, taking into account both heat dissipation efficiency and driving economy.

[0099] Example 2

[0100] See Figure 4 This embodiment provides a radiant cooling film-based cooling system for a transport vehicle's cooling compartment, comprising:

[0101] A transport truck 1, wherein the transport truck 1 includes a transport compartment 101;

[0102] A radiative cooling film 2 is located above the transport compartment 101 to improve the heat dissipation efficiency of the transport compartment 101.

[0103] An electric winding assembly 4 is installed on the transport truck 1 and is used to wind up the radiation cooling film 2 and to pull out the wound radiation cooling film 2.

[0104] The electric winding assembly 4 includes:

[0105] A take-up roller 401 is installed at one end of the transport carriage 101, and one end of the radiation cooling film 2 is wound and fixed on the take-up roller 401.

[0106] A direct drive module 402 is located above the transport compartment 101 and connected to the other end of the radiation cooling film 2, for pulling the radiation cooling film 2 out of the take-up roller 401.

[0107] In this embodiment, the take-up roller 401 is a spring-loaded take-up structure or an electric take-up structure.

[0108] Furthermore, the direct drive module 402 includes:

[0109] A transverse rotating shaft 4021 is parallel to the take-up roller 401, and the other end of the radiation cooling film 2 is fixed to the transverse rotating shaft 4021.

[0110] A linear drive mechanism 4022 is installed on the side of the transverse rotating shaft 4021 and is used to drive the transverse rotating shaft 4021 to move closer to or away from the winding roller 401 along the length direction of the transport carriage 101.

[0111] In this embodiment, the operation of the electric winding assembly 4 is as follows:

[0112] (1) Membrane material unfolding

[0113] When the linear drive mechanism 4022 is activated, the transverse shaft 4021 of the direct drive module 402 moves away from the take-up roller 401 along the length of the carriage under the traction of the linear drive mechanism 4022 (such as an electric push rod or lead screw slide). Simultaneously, it pulls the radiation-cooling film 2 fixed on the transverse shaft 4021, causing it to be continuously released from the take-up roller 401 and laid flat to cover the top of the carriage. A spring or electric take-up structure provides reverse damping during release, ensuring that the film maintains appropriate tension when unfolded, preventing wrinkles or slack.

[0114] (2) Membrane material recycling

[0115] When the membrane material needs to be stored, the linear drive mechanism 4022 drives the transverse rotating shaft 4021 to move towards the take-up roller 401. The take-up roller 401 rewinds and recycles the radiation cooling film 2 through the elastic reset of the spring or the active rotation of the electric motor. During the winding process, the parallel alignment design of the transverse rotating shaft 4021 and the take-up roller 401, combined with the path constraint of the linear drive mechanism 4022, ensures that the membrane material is wound evenly along a fixed trajectory, preventing deviation or misalignment of the layers.

[0116] In summary, the radiative cooling film-based vehicle cooling compartment system provided in this embodiment has the following advantages:

[0117] ① High reflectivity and high emission radiation cooling film 2: By reflecting sunlight and radiating heat, passive cooling is achieved without external energy, significantly reducing energy consumption and operating costs.

[0118] ② Automatic control of the electric winding assembly 4: Combined with the take-up roller 401 and the direct drive module 402, it automatically flattens and unfolds or retracts the film material, avoiding wrinkles and improving operating efficiency.

[0119] ③ All-weather passive heat dissipation mechanism: Breaking the thermal balance through physical optics principles to achieve continuous net cooling day and night, reducing thermal damage to goods.

[0120] ④ Flexible adaptation to environmental requirements: The membrane material state (unfolding / folding) can be adjusted according to weather or working conditions, taking into account both heat dissipation efficiency and driving economy.

[0121] Example 3

[0122] The following section uses specific experimental data to illustrate the actual operating effect of the radiative cooling film-based cooling system for transport vehicles.

[0123] Application Example 1: Testing the cooling performance of the folding structure shown in Example 1:

[0124] The prototype in this embodiment is divided into:

[0125] Model A: The top of the transport vehicle made of ordinary foam boxes is covered with an iron plate cover made of A3 steel plate (size: 15cm×30cm);

[0126] Model B: As shown in Example 1, a foldable radiant cooling film (15cm × 30cm) is covered on the top of a transport vehicle made of ordinary foam box.

[0127] To simulate the truck transportation process, the experiment used a DS standard blower (maximum wind force 190000R) to blow air onto models A and B to simulate wind resistance in actual transportation; the experiment was conducted in a sunny environment where both models A and B faced the sky and were unobstructed.

[0128] On December 8, 2024, at 11:45 AM Beijing time in Dongguan City, Guangdong Province, measurements were taken using a SMARTSENSOR high-precision rapid-response thermometer and hygrometer (instrument error of 0.1 ℃ and 1% RH), a Xinsite thermocouple HT-9815 (instrument error of ±0.1℃), a SMARTSENSOR handheld anemometer (instrument error of ±0.1m / s), and a solar irradiance meter (instrument error of ±0.1W / ㎡).

[0129] The probes of the thermometer, hygrometer, and solar irradiance meter were placed at the midpoint of the interval between the transport compartments of Model A and Model B, with a distance of 5 cm from each compartment. The probes of the thermocouples were placed inside the transport compartments of Model A and Model B, respectively (the probes were fixedly suspended in the center of the compartments without contacting any solid objects). A blower was placed directly in front of the vehicle to blow air onto the front of the vehicle, and an anemometer was used to measure the wind speed in front of the transport compartment to be 20 m / s (equivalent to a car speed of 72 km / h). Cardboard was installed on both sides of the transport compartments to prevent the natural wind from affecting the experiment.

[0130] Both Model A and Model B were placed in direct sunlight. Temperature and humidity data were recorded every minute for a total of 30 minutes. The obtained data were then plotted using Origin software, resulting in the graph shown below. Figure 5 , Figure 6 , Figure 7 ).

[0131] Depend on Figure 6 As can be seen, after 2 minutes, the interior of the transport compartment of Model A showed a significant temperature increase, while the interior of the transport compartment of Model B showed a significant temperature decrease, quickly reaching the ambient temperature. The interior temperature of the uncovered transport compartment of Model A was significantly higher than that of Model B. Between 2 and 10 minutes, the temperature of both transport compartments A and B continued to rise, but the temperature difference remained around 6°C. Between 10 and 30 minutes, the interior temperatures of both models began to stabilize, fluctuating within a certain range. The interior temperature of Model B remained slightly higher than the ambient temperature, and the temperature difference between the two models also tended to stabilize. The maximum recorded temperature difference was 10°C. ℃; It can be seen that the internal temperature of the transport compartment of Model B, which transports cooling products based on the 100% fan-shaped shielding system of the radiative cooling film, is always lower than that of the transport compartment of Model A, which has no shielding. Moreover, over time, the internal temperature of the transport compartment of Model B tends to be close to the ambient temperature, indicating the feasibility of the radiative cooling film and its excellent heat insulation and cooling effect.

[0132] Application Example 2: Testing the cooling performance of the folding structure shown in Example 2:

[0133] The prototype in this embodiment is divided into:

[0134] Model A: The top of the transport vehicle made of ordinary foam boxes is covered with an iron plate cover made of A3 steel plate (size: 15cm×30cm);

[0135] Model B: As shown in Example 2, a roll-up radiant cooling film (15cm × 30cm) is used to cover the top of a transport vehicle made of ordinary foam boxes.

[0136] To simulate the truck transportation process, the experiment used a DS standard blower (maximum wind force 190000R) to blow air onto models A and B to simulate wind resistance in actual transportation; the experiment was conducted in a sunny environment where both models A and B faced the sky and were unobstructed.

[0137] On November 23, 2024, at 1:15 PM Beijing time in Dongguan City, Guangdong Province, measurements were taken using a SMART SENSOR high-precision rapid-response thermo-hygrometer (instrument error of 0.1 ℃ and 1% RH), a Xinsite thermocouple HT-9815 (instrument error of ±0.1 ℃), a SMART SENSOR handheld anemometer (instrument error of ±0.1 m / s), and a solar irradiance meter (instrument error of ±0.1 W / ㎡).

[0138] The probes of the thermometer, hygrometer, and solar irradiance meter were placed at the midpoint between the transport carriages of Model A and Model B, with a distance of 5 cm from each carriage. The probes of the thermocouples were placed inside the two transport carriage models (the probes were fixedly suspended in the center of the box and did not come into contact with any solid object). A blower was placed directly in front of the front of the carriage to blow air onto the front of the carriage. At the same time, an anemometer was used to measure the wind speed in front of the transport carriage to be 20 m / s (equivalent to a car speed of 72 km / s). Cardboard was installed on both sides of the transport carriage to prevent the natural wind from the sides from affecting the experiment.

[0139] Both Model A and Model B were placed under the sun. Temperature and humidity data were recorded every minute for a total of 30 minutes. The data were then plotted using Origin software, resulting in the graph shown below. Figure 8 , Figure 9 , Figure 10 ).

[0140] Depend on Figure 9 As can be seen, within 0-2 minutes, the interior of the transport compartment of Model A showed a significant temperature rise, stabilizing at around 30°C, while the interior temperature of the transport compartment of Model B remained basically the same as the ambient temperature. Within 5-30 minutes, the interior of the transport compartment of Model A showed a stable temperature rise, and the temperature difference between the two stabilized at around 7°C. This indicates that the interior temperature of the transport compartment of Model B was consistently lower than that of the unshielded transport compartment of Model A. Furthermore, over time, the interior temperature of the transport compartment of Model B tended to stabilize and remained significantly lower than that of the unshielded transport compartment of Model A, demonstrating the feasibility of the radiative cooling film and its excellent heat insulation and cooling effect.

[0141] Application Example 3: Testing the cooling effect of a transport vehicle under a wind speed of 15 m / s:

[0142] The prototype in this embodiment is divided into:

[0143] Model A: The top of the transport vehicle made of ordinary foam boxes is covered with an iron plate cover made of A3 steel plate (size: 15cm×30cm);

[0144] Model B: As shown in Example 2, a roll-up radiant cooling film (15cm × 30cm) is used to cover the top of a transport vehicle made of ordinary foam boxes.

[0145] To simulate the truck transportation process, the experiment used a DS standard blower (maximum wind force 190000R) to blow air onto models A and B to simulate wind resistance in actual transportation; the experiment was conducted in a sunny environment where both models A and B faced the sky and were unobstructed.

[0146] On March 9, 2025, at 13:21 Beijing time in Dongguan City, Guangdong Province, measurements were taken using a SMARTSENSOR high-precision rapid-response thermometer and hygrometer (instrument error of 0.1 ℃ and 1% RH), a Xinsite thermocouple HT-9815 (instrument error of ±0.1 ℃), a SMARTSENSOR handheld anemometer (instrument error of ±0.1 m / s), and a solar irradiance meter (instrument error of ±0.1 W / ㎡).

[0147] The probes of the thermometer, hygrometer, and solar irradiance meter were placed at the midpoint of the interval between the transport carriages of Model A and Model B, with a distance of 5 cm from each carriage. The probes of the thermocouples were placed inside the two transport carriage models (the probes were fixedly suspended in the center of the box and did not come into contact with any solid object). A blower was placed directly in front of the front of the carriage to blow air onto the front of the carriage. At the same time, an anemometer was used to measure the wind speed in front of the transport carriage to be 15 m / s (equivalent to a car speed of 54 km / h). Cardboard was installed on both sides of the transport carriage to prevent the natural wind from the sides from affecting the experiment.

[0148] Both Model A and Model B were placed in direct sunlight. Temperature and humidity data were recorded every minute for a total of 30 minutes. The obtained data were then plotted into graphs using Origin software, as shown in the chart below. Figure 11 , Figure 12 , Figure 13 ).

[0149] Depend on Figure 12 As can be seen, within 0-20 minutes, the temperature inside the transport compartment of Model A continuously rises, stabilizing at around 40℃, while the temperature inside the transport compartment of Model B remains approximately 2℃ different from the ambient temperature. Within 20-30 minutes, the temperature inside the transport compartment of Model A begins to stabilize at 40℃, and the temperature difference between the two transport compartments stabilizes at around 4℃. This indicates that the temperature inside the transport compartment of Model B is consistently lower than that of the unshielded transport compartment of Model A, and over time, the temperature inside the transport compartment of Model B tends to stabilize and remains significantly lower than that of the unshielded transport compartment of Model A, demonstrating the feasibility of the radiative cooling film and its excellent heat insulation and cooling effect.

[0150] Application Example 4: Testing the cooling effect of a transport vehicle under a wind speed of 25 m / s:

[0151] The prototype in this embodiment is divided into:

[0152] Model A: The top of the transport vehicle made of ordinary foam boxes is covered with an iron plate cover made of A3 steel plate (size: 15cm×30cm);

[0153] Model B: As shown in Example 2, a roll-up radiant cooling film (15cm × 30cm) is used to cover the top of a transport vehicle made of ordinary foam boxes.

[0154] To simulate the truck transportation process, the experiment used a DS standard blower (maximum wind force 190000R) to blow air onto models A and B to simulate wind resistance in actual transportation; the experiment was conducted in a sunny environment where both models A and B faced the sky and were unobstructed.

[0155] On March 10, 2025, at 13:15 Beijing time in Dongguan City, Guangdong Province, measurements were taken using a SMARTSENSOR high-precision rapid-response thermometer and hygrometer (instrument error of 0.1 ℃ and 1% RH), a Xinsite thermocouple HT-9815 (instrument error of ±0.1 ℃), a SMARTSENSOR handheld anemometer (instrument error of ±0.1 m / s), and a solar irradiance meter (instrument error of ±0.1 W / ㎡).

[0156] The probes of the thermometer, hygrometer, and solar irradiance meter were placed at the midpoint of the interval between the transport carriages of Model A and Model B, with a distance of 5 cm from each carriage. The probes of the thermocouples were placed inside the two transport carriage models (the probes were fixedly suspended in the center of the box and did not come into contact with any solid object). A blower was placed directly in front of the front of the carriage to blow air onto the front of the carriage. At the same time, an anemometer was used to measure the wind speed in front of the transport carriage to be 25 m / s (equivalent to a car speed of 90 km / h). Cardboard was installed on both sides of the transport carriage to prevent the natural wind from the sides from affecting the experiment.

[0157] Both Model A and Model B were placed in direct sunlight. Temperature and humidity data were recorded every minute for a total of 30 minutes. The obtained data were then plotted into graphs using Origin software, as shown in the chart below. Figure 14 , Figure 15 , Figure 16 ).

[0158] Depend on Figure 15As can be seen, within 0-25 minutes, the temperature inside the transport compartment of Model A continuously rises, stabilizing at around 57℃, with a peak temperature reaching 60℃. Meanwhile, the temperature inside the transport compartment of Model B remains approximately 4℃ different from the ambient temperature. Within 25-30 minutes, the temperature inside the transport compartment of Model A begins to decrease, eventually stabilizing at around 55℃. The temperature difference between the two transport compartments stabilizes at around 15℃, with a peak temperature reaching 20℃. This indicates that the temperature inside the transport compartment of Model B is consistently lower than that of the unprotected transport compartment of Model A. Furthermore, over time, the temperature inside the transport compartment of Model B stabilizes and remains significantly lower than that of the unprotected transport compartment of Model A, demonstrating the feasibility of the radiative cooling film and its excellent heat insulation and cooling effect.

[0159] Based on the experimental results of multiple application examples 1 and 2 of radiative cooling films with different structures, the cooling effect of the transport vehicle compartment is superior when covered by the radiative cooling film. Even with 100% coverage, after half an hour or an hour, the cooling system of the transport vehicle compartment based on the radiative cooling film provides shading and achieves varying degrees of cooling, ranging from 7-12℃. Furthermore, the temperature difference remains stable over time and even shows a gradual increasing trend. In addition, based on the experimental results of application examples 2, 3, and 4 of radiative cooling films under different wind speeds, the cooling effect is most significant at a wind speed of 25 m / s, with a maximum temperature difference of 20℃, stabilizing at around 15℃. These experimental results are suitable for this application scenario in truck transportation.

[0160] In summary, the results of the prototype radiative cooling test are sufficient to verify the feasibility of this invention. It has been proven that, without the need for active cooling methods such as energy consumption and the addition of refrigerants, this design of a uniquely shaped truck cooling product based on a radiative cooling film can achieve effective cooling. The use of this low-cost truck cooling system based on a radiative cooling film will save cooling energy, reduce carbon emissions, mitigate the greenhouse effect, and protect the environment, while providing the truck transportation industry with a new and effective means of controlling truck compartment temperature, thus possessing significant market potential.

[0161] It should be noted that the linear drive mechanism mentioned in this utility model can be a cylinder, hydraulic cylinder, electric cylinder, or motor lead screw linear module, etc., and the rotary drive mechanism mentioned can be a brushed motor, brushless motor, or rotary cylinder, etc. This utility model does not limit the specific structural form of the linear drive mechanism and the rotary drive mechanism.

[0162] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A transport vehicle cooling van system based on a radiative cooling film, characterized in that, include: A transport truck (1), the transport truck (1) including a transport compartment (101); A radiation cooling film (2) is located above the transport compartment (101) to improve the heat dissipation efficiency of the transport compartment (101); A rotating folding bracket (3) is installed on the transport compartment (101) and is used to support the radiative cooling film (2).

2. The vehicle cooling compartment system based on a radiative cooling film according to claim 1, characterized in that, The rotating folding support (3) includes several inverted U-shaped support rods (301). The inverted U-shaped support rods (301) include a first vertical rod with its lower end installed on one side of the transport car (101), a second vertical rod with its lower end installed on the other side of the transport car (101), and a horizontal rod connecting the upper ends of the two vertical rods. The radiation cooling film (2) is fixed to the top of each of the crossbars.

3. The radiation-emissive film-based transport vehicle cooling compartment system of claim 2, wherein, The lower end of each of the first vertical rods is rotatably connected to one side of the transport car (101), and the lower end of each of the second vertical rods is rotatably connected to the other side of the transport car (101). Each of the inverted U-shaped support rods (301) has a covering state in which it rotates to separate from each other, so that the radiative cooling film (2) unfolds above the transport compartment (101); and a folded state in which it rotates to bring itself closer to each other, so that the radiative cooling film (2) gathers above the transport compartment (101).

4. The vehicle cooling compartment system based on a radiative cooling film according to claim 1, characterized in that, It also includes an electric winding assembly (4) installed on the transport vehicle (1) for winding the radiation cooling film (2) and for pulling out the wound radiation cooling film (2).

5. The vehicle cooling body system based on a radiative cooling film according to claim 4, characterized in that, The electric winding assembly (4) includes: A take-up roller (401) is installed at one end of the transport carriage (101), and one end of the radiation cooling film (2) is wound and fixed on the take-up roller (401); A direct drive module (402) is located above the transport compartment (101) and connected to the other end of the radiation cooling film (2) for pulling the radiation cooling film (2) out of the take-up roller (401).

6. The vehicle cooling body system based on a radiative cooling film according to claim 5, characterized in that, The take-up roller (401) is a spring-loaded take-up structure or an electric take-up structure.

7. The vehicle cooling body system based on a radiative cooling film according to claim 5, characterized in that, The direct drive module (402) includes: A transverse rotating shaft (4021) is parallel to the take-up roller (401), and the other end of the radiation cooling film (2) is fixed on the transverse rotating shaft (4021); A linear drive mechanism (4022) is installed on the side of the transverse rotating shaft (4021) to drive the transverse rotating shaft (4021) to move closer to or away from the winding roller (401) along the length of the transport carriage (101).

8. The vehicle cooling body system based on a radiative cooling film according to claim 1, characterized in that, The radiation cooling film (2) is attached and fixed to the top of the transport compartment (101).

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