Fresh water evaporation refrigeration display system

Abstract

The utility model relates to the technical field of evaporation refrigeration, concretely to a fresh water evaporation refrigeration display system, include: refrigeration display device, temperature control device and vacuum pump, the refrigeration display device is used for evaporation refrigeration, is equipped with temperature control device below refrigeration display device, temperature control device is used for placing refrigeration display device and carries out real -time monitoring, is equipped with vacuum pump above refrigeration display device, and vacuum pump is used for the vacuum pumping of refrigeration display device, the utility model discloses a combination of refrigerant and drying agent, based on the triple point principle of water, utilize its evaporation heat absorption characteristic and humidity response type valve combination, need not external energy input to realize controllable low temperature output, realize short time, efficient, green refrigeration effect.

Description

Technical Field

[0001] This utility model relates to the field of evaporative refrigeration technology, specifically a freshwater evaporative refrigeration demonstration system. Background Technology

[0002] Evaporative refrigeration is a physical process in which molecules on a liquid surface vaporize and absorb heat. It achieves a cooling effect by lowering the ambient temperature and is commonly seen in natural phenomena and industrial applications. This process is affected by factors such as temperature, humidity, liquid contact area, and airflow speed.

[0003] Evaporative cooling, as a demonstration device for evaporative cooling, works by using a vacuum pump to create a vacuum, thereby reducing the internal pressure of the device and lowering the boiling point of water. This allows water to evaporate at room temperature, achieving evaporative cooling by absorbing heat.

[0004] The prior art provides a freshwater vacuum evaporation refrigeration (ice) technology and device, with the publication number CN106958970A. It discloses a technology for achieving refrigeration in a closed environment by using water evaporation. However, its evaporation rate is slow, its refrigeration efficiency is low, its device is complex, and its cooling rate and range are difficult to meet the needs of most applications. It is also difficult to visualize the refrigeration method and principle.

[0005] In view of this, we propose a freshwater evaporative cooling demonstration system. Utility Model Content

[0006] The purpose of this invention is to provide a freshwater evaporative cooling demonstration system to solve the problem mentioned in the background art that evaporative cooling cannot be visualized.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A freshwater evaporative cooling demonstration system: A freshwater evaporative cooling demonstration system includes: a cooling demonstration device, a temperature control device, and a vacuum pump. The cooling demonstration device is used for evaporative cooling, demonstrating the process and principle of evaporative cooling. A temperature control device is located below the cooling demonstration device, used to hold and monitor its temperature in real time, allowing viewers to intuitively understand temperature changes. A vacuum pump is located above the cooling demonstration device, used to create a vacuum inside the device, reducing internal pressure and lowering the boiling point of water, thus achieving evaporative cooling.

[0008] Preferably, the refrigeration display device includes an evaporative cooling vacuum tube, a drying vacuum tube, a humidity-responsive vacuum valve, a vacuum extraction valve, and a vacuum flange. The evaporative cooling vacuum tube holds pure water. During operation, the pure water evaporates and absorbs heat in the evaporative cooling vacuum tube, thus achieving evaporative cooling. A drying vacuum tube is located on one side of the evaporative cooling vacuum tube. A desiccant is installed inside the drying vacuum tube to absorb the evaporated pure water, thereby ensuring the vacuum level inside the device. A humidity-responsive vacuum valve and a vacuum extraction valve are installed sequentially between the evaporative cooling vacuum tube and the drying vacuum tube. When the vacuum extraction valve is open, a vacuum is drawn from the interior. When the vacuum extraction valve is closed, the refrigeration display device is sealed, thus ensuring the airtightness of the refrigeration display device and maintaining the vacuum level inside the refrigeration display device. The humidity-responsive vacuum valve controls its opening and closing angle based on the humidity inside the refrigeration display device, thereby controlling the evaporation rate of pure water. When the humidity inside the refrigeration display device is high, the humidity-responsive vacuum valve opens to adjust the pressure, promoting the entry of steam into the drying vacuum tube and preventing excessive water vapor accumulation in the pipe. When the humidity is low, the opening angle of the humidity-responsive vacuum valve decreases, promoting the evaporation of pure water and ensuring the refrigeration efficiency of the refrigeration display device, achieving efficient and stable refrigeration. The evaporative cooling vacuum tube, drying vacuum tube, humidity-responsive vacuum valve, and suction valve are connected to each other via vacuum flanges, ensuring the airtightness of the refrigeration display device and the stability of the vacuum environment inside the refrigeration display device, thus ensuring the stable operation of water evaporative refrigeration.

[0009] Preferably, the evaporative cooling vacuum tube and the drying vacuum tube are made of high borosilicate glass and quartz. High borosilicate glass and quartz have good transparency. Using high borosilicate glass and quartz to make the evaporative cooling vacuum tube and the drying vacuum tube allows the entire process of pure water evaporation and cooling to be well displayed to the audience, thereby achieving a visual display.

[0010] Preferably, the desiccant is a biodegradable desiccant, which is filled with silica gel, calcium chloride, and molecular sieves. The use of biodegradable desiccant ensures its water absorption while allowing it to degrade naturally, thus ensuring the environmental friendliness of the refrigeration display device. Silica gel desiccant has good water absorption and can be reused, achieving resource conservation. Calcium chloride has extremely strong water absorption, capable of absorbing several times its own weight in water. Molecular sieves have a large specific surface area and high adsorption capacity, maintaining good performance even at low relative humidity or high temperature.

[0011] Preferably, the temperature control device includes a support base, a temperature display, and a temperature sensor. An evaporative cooling vacuum tube, a humidity-responsive vacuum valve, a suction valve, and a drying vacuum tube are sequentially mounted on the support base. The support base provides support and fixation for the refrigeration display device, ensuring its stability. A temperature display is fixedly mounted on the support base and connected to the temperature sensor. The temperature sensor is fixedly mounted at both ends of the support base, located below the evaporative cooling vacuum tube and the drying vacuum tube, respectively. The temperature sensor is fixedly mounted on the base and in contact with both the evaporative cooling vacuum tube and the drying vacuum tube, respectively, to collect the temperature of the evaporative cooling vacuum tube and the drying vacuum tube in real time and display it on the temperature display. This facilitates real-time display of temperature changes during the water vapor evaporation and refrigeration process, providing strong dynamic display capabilities and making it easy for viewers to understand.

[0012] Preferably, the vacuum pump is connected to the air extraction valve. The vacuum pump achieves vacuuming inside the refrigeration display device through the air extraction valve. The vacuum pump is connected to the refrigeration display device through the air extraction valve. When it is necessary to vacuum the refrigeration display device, the air extraction valve is opened. After the vacuuming is completed, the air extraction valve is closed. Then, the vacuum pump is separated from the air extraction valve, and the refrigeration display device is placed on the temperature control device for fixation.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. A freshwater evaporative cooling demonstration system. This utility model combines refrigerant and desiccant, based on the triple point principle of water, utilizing its evaporative heat absorption characteristics and humidity-responsive valve combination, to achieve controllable low-temperature output without external energy input, thus achieving short-time, efficient, and green cooling effect.

[0014] 2. A freshwater evaporation refrigeration demonstration system. This utility model demonstrates the entire process of pure water evaporation refrigeration in real time through a pure water evaporation refrigeration system, and can realize different refrigeration efficiencies, dynamically demonstrating the relationship between evaporation rate and refrigeration efficiency.

[0015] 3. A freshwater evaporation and refrigeration display system. This utility model allows direct observation of the pure water evaporation process and the real-time changes in the color and temperature of the desiccant through a visual design, and has strong dynamic display capabilities. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the system framework of this utility model; Figure 2 This is a schematic diagram of the refrigeration display device of this utility model; Figure 3 This is a schematic diagram of the temperature control device of this utility model; Figure 4This is a schematic diagram of the vacuum pump of this utility model; Figure 5 This is a schematic diagram illustrating the usage method of the display system of this utility model; Figure 6 This is a schematic diagram illustrating the usage of the refrigeration display device of this utility model.

[0017] In the picture: 1. Refrigeration display device; 11. Evaporative cooling vacuum tube; 111. Pure water; 12. Drying vacuum tube; 121. Moisture-absorbing desiccant; 13. Humidity-responsive vacuum valve; 14. Evaporation valve; 15. Vacuum flange; 2. Temperature control device; 21. Support base; 22. Temperature display; 23. Temperature sensor; 3. Vacuum pump. Detailed Implementation

[0018] 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.

[0019] Evaporative cooling, as a demonstration device for evaporative cooling, works by using a vacuum pump to create a vacuum, thereby reducing the internal pressure of the device and lowering the boiling point of water. This allows water to evaporate at room temperature, achieving evaporative cooling by absorbing heat.

[0020] The prior art provides a freshwater vacuum evaporation refrigeration (ice) technology and device, with the publication number CN106958970A. It discloses a technology for achieving refrigeration in a closed environment by using water evaporation. However, its evaporation rate is slow, its refrigeration efficiency is low, its device is complex, and its cooling rate and range are difficult to meet the needs of most applications. It is also difficult to visualize the refrigeration method and principle.

[0021] This utility model provides a technical solution: like Figures 1 to 6 As shown, a freshwater evaporative cooling demonstration system is presented: like Figures 1 to 4 As shown, a freshwater evaporative cooling demonstration system includes: a cooling demonstration device 1, a temperature control device 2, and a vacuum pump 3; the cooling demonstration device 1 is used for evaporative cooling, and the temperature control device 2 is provided below the cooling demonstration device 1; the temperature control device 2 is used to place the cooling demonstration device 1 and perform real-time monitoring; the vacuum pump 3 is provided above the cooling demonstration device 1 and is used to evacuate the cooling demonstration device 1. Specifically, the refrigeration display device 1 is used for evaporative refrigeration. The refrigeration display device 1 is used to realize and demonstrate the process and principle of evaporative refrigeration of pure water 111. A temperature control device 2 is provided below the refrigeration display device 1. The temperature control device 2 is used to place the refrigeration display device 1 and monitor it in real time. The temperature control device 2 is used to monitor and display the temperature of the refrigeration display device 1 in real time, so that the audience can intuitively understand the temperature change of the refrigeration display device 1. A vacuum pump 3 is provided above the refrigeration display device 1. The vacuum pump 3 is used to evacuate the refrigeration display device 1. The vacuum pump 3 is used to perform vacuum suction inside the refrigeration display device 1, thereby reducing the internal air pressure of the refrigeration display device 1, thereby lowering the boiling point of water, thus realizing evaporative refrigeration of water.

[0022] In this embodiment, the refrigeration display device 1 includes an evaporative cooling vacuum tube 11, a drying vacuum tube 12, a humidity-responsive vacuum valve 13, a vacuum valve 14, and a vacuum flange 15. The evaporative cooling vacuum tube 11 is used to hold pure water 111, and a drying vacuum tube 12 is provided on one side of the evaporative cooling vacuum tube 11. A moisture-absorbing desiccant 121 is installed inside the drying vacuum tube 12. The humidity-responsive vacuum valve 13 and the vacuum valve 14 are installed sequentially between the evaporative cooling vacuum tube 11 and the drying vacuum tube 12. The evaporative cooling vacuum tube 11, the drying vacuum tube 12, the humidity-responsive vacuum valve 13, and the vacuum valve 14 are connected to each other through the vacuum flange 15. Specifically, the evaporative cooling vacuum tube 11 is used to hold pure water 111. During operation, the pure water 111 evaporates and vaporizes in the evaporative cooling vacuum tube 11, absorbing heat and thus achieving evaporative cooling. A drying vacuum tube 12 is provided on one side of the evaporative cooling vacuum tube 11. A moisture-absorbing desiccant 121 is installed inside the drying vacuum tube 12 to absorb the evaporated water vapor, thereby ensuring the vacuum level inside the device. A humidity-responsive vacuum valve 13 and a vacuum extraction valve 14 are installed sequentially between the evaporative cooling vacuum tube 11 and the drying vacuum tube 12. When the vacuum extraction valve 14 is open, it performs vacuum extraction inside the device. When the vacuum extraction valve 14 is closed, it closes the refrigeration display device 1, thereby ensuring the airtightness of the refrigeration display device 1 and the vacuum level inside the refrigeration display device 1. The humidity-responsive vacuum valve 13 adjusts according to the humidity inside the refrigeration display device 1. The humidity inside the refrigeration display device 1 is controlled by adjusting the opening and closing angle of its valve, thereby controlling the evaporation rate of the pure water 111. When the humidity inside the refrigeration display device 1 is high, the humidity-responsive vacuum valve 13 opens to adjust the pressure, promoting the entry of steam into the drying vacuum tube 12, preventing excessive water vapor accumulation in the tube and affecting the vacuum level. When the humidity is low, the opening angle of the humidity-responsive vacuum valve 13 decreases, promoting the evaporation of the pure water 111, thereby ensuring the humidity inside the refrigeration display device 1. The evaporative cooling vacuum tube 11, the drying vacuum tube 12, the humidity-responsive vacuum valve 13, and the suction valve 14 are connected to each other by a vacuum flange 15, thereby ensuring the airtightness of the refrigeration display device 1, thus ensuring the stability of the vacuum environment inside the refrigeration display device 1, and ensuring the stable operation of water evaporative cooling.

[0023] In this embodiment, the evaporation cooling vacuum tube 11 and the drying vacuum tube 12 are made of high borosilicate and quartz. Specifically, the glass made of high borosilicate and quartz has good transparency. The evaporation cooling vacuum tube 11 and the drying vacuum tube 12 are made of high borosilicate and quartz, so that the whole process of evaporation and cooling of pure water 111 can be well displayed in front of the audience, thus realizing a visual display. At the same time, high borosilicate and quartz have high strength and high temperature resistance, which not only realizes the visual display, but also ensures the strength and service life of the cooling display device 1. Preferably, the evaporation vacuum tube is spherical in shape, with a diameter preferably between 80 mm and 150 mm. The drying vacuum tube 12 is preferably cylindrical in shape, with a length preferably between 90 mm and 180 mm.

[0024] In this embodiment, the moisture-absorbing desiccant 121 is a biodegradable moisture-absorbing material, and the moisture-absorbing desiccant 121 is filled with silica gel, calcium chloride and molecular sieve; Specifically, the use of biodegradable moisture-absorbing materials ensures the water absorption of the desiccant 121 while allowing it to degrade naturally, thus guaranteeing the environmental friendliness of the refrigeration display device 1. Silica gel desiccant has excellent water absorption and can be reused, achieving resource conservation. Furthermore, silica gel desiccant changes color after absorbing water, making it easier to display to the audience and achieving a visual demonstration of evaporative refrigeration. Calcium chloride has extremely strong water absorption, capable of absorbing several times its own weight in water. Molecular sieves have a large specific surface area and high adsorption capacity, maintaining good performance even at low relative humidity or high temperature. Preferably, the weight of the purified water 111 is between 20g and 100g, and the weight of the desiccant 121 is preferably between 150g and 400g, to ensure the completeness and stability of the desiccant 121 in absorbing water vapor, thereby ensuring the vacuum level inside the refrigeration display device 1.

[0025] In this embodiment, the temperature control device 2 includes a support base 21, a temperature display 22, and a temperature sensor 23; an evaporative cooling vacuum tube 11, a humidity-responsive vacuum valve 13, a vacuum valve 14, and a drying vacuum tube 12 are sequentially installed on the support base 21. Specifically, the support base 21 supports and fixes the refrigeration display device 1, ensuring the stability of the installation of the refrigeration display device 1; a temperature display 22 is fixedly installed on the support base 21, and the temperature display 22 is connected to the temperature sensor 23; the temperature sensor 23 is fixedly installed at both ends of the support base 21, and the temperature sensor 23 is located below the evaporative cooling vacuum tube 11 and the drying vacuum tube 12 respectively. The temperature sensor 23 is fixedly installed on the base and is in contact with the evaporative cooling vacuum tube 11 and the drying vacuum tube 12 respectively, so as to collect the temperature of the evaporative cooling vacuum tube 11 and the drying vacuum tube 12 in real time and display it through the temperature display 22, thereby facilitating the real-time display of temperature changes during the water vapor evaporation and refrigeration process, with strong dynamic display capabilities, making it easy for the audience to watch and understand.

[0026] Preferably, the support base 21 can be made of polyethylene, polypropylene, polystyrene, or ABS. Polyethylene has excellent low-temperature resistance, with a minimum operating temperature of -70℃ to -100℃; polypropylene is lightweight and heat-resistant, with strong corrosion resistance, suitable for acid and alkaline environments, easy to process and mold, and has low cost, making it suitable for mass production; polystyrene has high transparency, is easy to dye and electroplated, and is suitable for making transparent shells; ABS has balanced comprehensive performance, combining toughness and rigidity, making it suitable for complex structural parts, easy to surface treat, and wear-resistant and impact-resistant. The temperature sensor 23 can be an existing thermocouple or resistive sensor, etc.

[0027] In this embodiment, the vacuum pump 3 is connected to the air extraction valve 14, and the vacuum pump 3 achieves vacuuming inside the refrigeration display device 1 through the air extraction valve 14. Specifically, the vacuum pump 3 is connected to the refrigeration display device 1 through the suction valve 14. When it is necessary to perform vacuum extraction on the refrigeration display device 1, the suction valve 14 is opened. After the vacuum extraction is completed, the suction valve 14 is closed. Then the vacuum pump 3 is separated from the suction valve 14, and the refrigeration display device 1 is placed on the temperature control device 2 for fixation. Preferably, the air extraction valve 14 can be a diaphragm valve, pull-out valve, baffle valve, ball valve, butterfly valve and other valves, and the preferred dimensions are a length between 60mm and 140mm and a height between 50mm and 110mm. The vacuum pump 3 can be a rotary vane vacuum pump 3, a screw vacuum pump 3, or a roots vacuum pump 3, etc. The ultimate vacuum degree of the vacuum pump 3 is preferably between 0.1 Pa and 100 Pa. The vacuum pump 3 and the suction valve 14 work together to ensure that different vacuum degrees can be set in the refrigeration display device 1.

[0028] Figure 1 This is a schematic diagram of the system framework of this utility model. The diagram details the composition and connection relationship of the system. The vacuum pump 3 and the suction valve 14 are used to evacuate the inside of the refrigeration display device 1. After the evacuation is completed, the vacuum pump 3 and the suction valve 14 are separated, the refrigeration display device 1 is placed on the support base 21, and the evaporative cooling vacuum tube 11, the drying vacuum tube 12 and the temperature sensor 23 are brought into contact. The temperature of the evaporative cooling vacuum tube 11 and the drying vacuum tube 12 during the refrigeration process is then monitored and displayed through the temperature sensor 23.

[0029] like Figures 5 to 6 As shown, a freshwater evaporative cooling method includes the following steps: Step 1: Assemble the refrigeration display device and perform vacuum suction; Step 2: Connect the refrigeration display device to the temperature control device; Step 3: The refrigeration display device refrigerates and controls the temperature in real time; Step 4: The temperature control device monitors the temperature of the refrigeration display device in real time; Specifically, the raw materials for evaporative refrigeration are prepared by placing purified water and a desiccant inside the refrigeration demonstration device. A vacuum pump then lowers the boiling point of the water vapor, facilitating the vaporization and heat absorption of the purified water for refrigeration. The refrigeration demonstration device is fixedly mounted on a support base of a temperature control device, and is placed in contact with a temperature sensor to monitor its temperature. The refrigeration efficiency can be adjusted during the refrigeration process, allowing viewers to observe the refrigeration process at different efficiencies and dynamically demonstrate the relationship between evaporation rate and refrigeration efficiency. The temperature control device monitors the temperature of the refrigeration demonstration device in real time, enabling viewers to clearly understand temperature changes and, in conjunction with the changes in the purified water and desiccant inside, clearly understand the working principle and process of purified water evaporative refrigeration.

[0030] In this embodiment, step 1 further includes the following steps; Step 1.1: Add purified water to the evaporative cooling vacuum tube and add a desiccant to the inside of the vacuum tube; Step 1.2: Connect the evaporative cooling vacuum tube, humidity-responsive vacuum valve, pumping valve, and drying vacuum tube via the vacuum flange; Step 1.3: Connect the vacuum pump to the suction valve to perform vacuuming; Step 1.4: Close the suction valve and disconnect from the vacuum pump; Specifically, pure water is added to the evaporative cooling vacuum tube for evaporative cooling, and a desiccant is added to the drying vacuum tube to absorb the water vapor from the evaporation of the pure water, thus preventing excessive water vapor in the tube from affecting the subsequent vacuum level. The evaporative cooling vacuum tube, humidity-responsive vacuum valve, suction valve, and drying vacuum tube are connected in sequence through flanges to ensure the airtightness of each component, thereby ensuring the stability of subsequent vacuum suction and maintaining the vacuum level of the refrigeration display device. The vacuum pump is connected to the refrigeration display device through the suction valve. The suction valve is opened, and then the vacuum pump is started to evacuate the refrigeration display device. After the vacuum is evacuated, the suction valve and vacuum pump are closed, and then the vacuum pump is separated from the suction valve and removed from the refrigeration display device.

[0031] In this embodiment, step 3 further includes the following steps; Step 3.1: The humidity-responsive vacuum valve opens; Step 3.2: Pure water evaporates under vacuum, absorbing heat and cooling. Step 3.3: The desiccant absorbs water vapor to maintain vacuum. Step 3.4: Demonstration of how the humidity-responsive vacuum valve adjusts its cooling efficiency based on humidity. Specifically, the humidity-responsive vacuum valve is opened, and it adjusts the evaporation efficiency of the purified water according to the internal humidity. The purified water evaporates and vaporizes in a vacuum environment, absorbing heat during vaporization, which in turn stabilizes the surrounding environment, thus achieving a cooling effect. The evaporated water vapor moves into the vacuum drying tank and is absorbed by the desiccant, preventing excessive water vapor from affecting the vacuum level inside the refrigeration display device and thus the evaporative cooling effect. The humidity-responsive vacuum valve opens according to the internal humidity, thereby adjusting the cooling efficiency of the refrigeration display device, which in turn increases the evaporation efficiency of the purified water, thus dynamically demonstrating the relationship between the evaporation rate and the cooling efficiency.

[0032] In this embodiment, step 4 includes the following steps: Step 4.1: The temperature sensor detects the surface temperature of the evaporative cooling vacuum tube and the drying vacuum tube; Step 4.2: The temperature sensor detects the surface temperature of the evaporative cooling vacuum tube and the drying vacuum tube; Step 4.3: The temperature sensor transmits the data to the temperature display for viewing; Specifically, the temperature sensor monitors the temperature of the evaporative cooling vacuum tube and the drying vacuum tube during the cooling process of the refrigeration display device, allowing viewers to observe the temperature changes intuitively; the temperature sensor displays the real-time temperature of the evaporative cooling vacuum tube and the drying vacuum tube, and then combines this with changes in water vapor concentration and desiccant to demonstrate the principle of evaporative cooling.

[0033] Figure 5 This diagram illustrates the process of the present invention. It explains the main steps: First, pure water and a desiccant are placed in an evaporative cooling vacuum tube and a drying vacuum tube, respectively, to assemble the refrigeration display device. Then, a vacuum pump is used to evacuate the interior of the refrigeration display device. After evacuation, the refrigeration display device is placed on a support base and brought into contact with a temperature sensor. A humidity-responsive vacuum valve is then activated to control the evaporation rate of the pure water, thereby controlling the refrigeration efficiency. Simultaneously, the temperature sensor monitors the temperature of the refrigeration display device and displays it on a temperature display.

[0034] Figure 6This diagram illustrates the refrigeration method of this invention. The refrigeration display device is connected to a vacuum pump via an air extraction valve. The air extraction valve is opened, and the vacuum pump is turned on to create a vacuum. Once the pressure inside the refrigeration display device drops below 100 Pa, the air extraction valve is closed, and the vacuum pump is turned off. The connection between the vacuum pump and the air extraction valve is then disconnected. The refrigeration display device is removed and placed on a support base, allowing the evaporative cooling vacuum tube and the drying vacuum tube to come into contact with the temperature sensor. The humidity-responsive vacuum valve opens to initiate refrigeration and regulates the refrigeration efficiency. Simultaneously, the temperature sensor monitors the temperature and displays it on a temperature display.

[0035] In use, the freshwater evaporative cooling display system of this utility model is installed by fixing the support base 21 on the display table, connecting the temperature sensor 23 and the temperature display 22 and installing them together on the support base 21, adding 50g of pure water 111 to the evaporative cooling vacuum tube 11, and adding 220g of desiccant 121 to the drying vacuum tube 12. The evaporative cooling vacuum tube 11, the drying vacuum tube 12, the humidity response vacuum valve 13 and the suction valve 14 are connected to each other by a vacuum flange 15. The cooling display device 1 is connected to the vacuum pump 3 through the suction valve 14. The suction valve 14 is opened and the vacuum pump 3 is turned on to draw a vacuum. After the pressure inside the cooling display device 1 is lower than 100Pa, the suction valve 14 is closed and the vacuum pump 3 is turned off. The connection between the vacuum pump 3 and the suction valve 14 is disconnected, and the cooling display device 1 is removed and placed on the support base 21. The refrigeration equipment is ready. During the demonstration, temperature sensor 23 and temperature display 22 are turned on, and humidity-responsive vacuum valve 13 is opened. Humidity-responsive vacuum valve 13 controls the valve opening according to humidity, thereby controlling the evaporation rate of pure water 111. Pure water 111 evaporates under vacuum, causing the evaporative cooling vacuum tube 11 to cool down rapidly. Temperature display 22 shows the real-time temperature measured by temperature sensor 23 as 2 to 10°C. Desiccant 121 absorbs the water vapor produced by the evaporation of pure water 111 to maintain the vacuum state inside the device, allowing the cooling process to continue. After the demonstration, humidity-responsive vacuum valve 13 is closed, the evaporative cooling process stops, and the temperature inside the cooling demonstration device 1 gradually rises.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A freshwater evaporative cooling demonstration system, characterized in that, include: Refrigeration display device (1), temperature control device and vacuum pump (3); The refrigeration display device (1) is used for evaporative refrigeration, and a temperature control device is provided below the refrigeration display device (1); The temperature control device is used to place the refrigeration display device (1) and to monitor it in real time; A vacuum pump (3) is provided above the refrigeration display device (1), and the vacuum pump (3) is used to evacuate the refrigeration display device (1).

2. The freshwater evaporation refrigeration demonstration system according to claim 1, characterized in that: The refrigeration display device (1) includes an evaporative cooling vacuum tube (11), a drying vacuum tube (12), a humidity-responsive vacuum valve (13), an air extraction valve (14), and a vacuum flange (15). The evaporative cooling vacuum tube (11) is used to hold pure water (111), and a drying vacuum tube (12) is provided on one side of the evaporative cooling vacuum tube (11). The drying vacuum tube (12) is equipped with a moisture-absorbing desiccant (121). A humidity-responsive vacuum valve (13) and an air extraction valve (14) are installed sequentially between the evaporative cooling vacuum tube (11) and the drying vacuum tube (12). The evaporative cooling vacuum tube (11), the drying vacuum tube (12), the humidity-responsive vacuum valve (13), and the suction valve (14) are connected to each other via a vacuum flange (15).

3. The freshwater evaporation refrigeration demonstration system according to claim 2, characterized in that: The evaporative cooling vacuum tube (11) and the drying vacuum tube (12) are made of high borosilicate and quartz.

4. The freshwater evaporation refrigeration demonstration system according to claim 2, characterized in that: The moisture-absorbing desiccant (121) is a biodegradable composite moisture-absorbing material, and the moisture-absorbing desiccant (121) is filled with silica gel, calcium chloride and molecular sieve.

5. The freshwater evaporation refrigeration demonstration system according to claim 3, characterized in that: The temperature control device includes a support base (21), a temperature display (22), and a temperature sensor (23). An evaporative cooling vacuum tube (11), a humidity-responsive vacuum valve (13), a suction valve (14), and a drying vacuum tube (12) are sequentially installed on the support base (21). A temperature display (22) is fixedly installed on the bracket base (21), and the temperature display (22) is connected to the temperature sensor (23); The temperature sensor (23) is fixedly installed at both ends of the bracket base (21), and the temperature sensor (23) is located below the evaporative cooling vacuum tube (11) and the drying vacuum tube (12), respectively.

6. The freshwater evaporation refrigeration demonstration system according to claim 2, characterized in that: The vacuum pump (3) is connected to the air extraction valve (14), and the vacuum pump (3) achieves vacuuming inside the refrigeration display device (1) through the air extraction valve (14).

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