A refrigeration and dehumidification system based on double air ducts

Abstract

The utility model discloses a refrigeration and dehumidification system based on double air ducts, including a refrigeration and dehumidification machine, a fan and a circulation air duct; the fan includes an inner circulation fan and an outer circulation fan; the circulation air duct includes an inner circulation air duct and an outer circulation air duct; the inner circulation fan is used to promote the circulation of air in the inner circulation air duct and the cold storage; the outer circulation fan is used to promote the circulation of air in the outer circulation air duct and the cold storage; the main unit of the refrigeration and dehumidification machine is arranged in the cold storage, and the circulation air duct is arranged along the inner wall of the cold storage; the refrigeration and dehumidification machine includes a refrigeration device and a control module. The refrigeration and dehumidification system based on double air ducts can effectively ensure that the humidity and temperature in the storage reach the preset value, the temperature and humidity are well uniform, and the energy-saving effect is ideal.

Description

Technical Field

[0001] The utility model relates to a refrigeration and dehumidification system based on double air ducts. Background Art

[0002] As the country pays more and more attention to agriculture and provides more and more support, the requirements for high-precision constant temperature and humidity equipment in agriculture and other fields are becoming more and more numerous and higher.

[0003] Specific places such as cold storage generally use refrigeration equipment + dehumidifier to solve the humidity problem. In recent years, the scope of using new equipment and technologies with refrigeration and dehumidification functions has become increasingly widespread. Due to its working principle, the temperature difference in the warehouse is large (the temperature difference reaches 8-10°C when the humidity is 45% in general situations), and the humidity difference is also large (typically, the humidity rises by about 5%-15% within 1-2 minutes after shutdown, and the fluctuation is large).

[0004] Analysis of the reasons why the existing technology has the above shortcomings: In special constant temperature and humidity occasions such as cold storage, when refrigeration and dehumidification are used, the refrigeration and dehumidification principle determines that the speed of the evaporator fan motor in the warehouse is relatively low; the perception of refrigeration and dehumidification parameters is achieved through sensors, and the lower the temperature and humidity, the lower the wind speed, the smaller the affected range; coupled with factors such as the stacking of goods in the warehouse hindering air flow, the circulation range formed is limited, and the temperature and humidity are difficult to penetrate into every corner, resulting in uneven temperature and humidity in the warehouse, which has a greater negative impact on the storage of goods and greatly limits the promotion and application of the technology.

[0005] Conventional methods for obtaining ultra-low humidity: professional dehumidifiers are generally used for humidity above 50%, and a few non-standard products can reach about 30%; the disadvantage is that the dehumidifier design is integrated (there are no split dehumidifiers on the market due to many factors), and the heat generated by the compressor refrigeration is discharged indoors, and the matching refrigeration system is needed to balance the heat in order to achieve the requirements of constant temperature and humidity, and the energy consumption is relatively high;

[0006] At the same time, there is uneven temperature and humidity, and a heat island area is formed near the dehumidifier.

[0007] In addition, some specific environments require more stringent conditions:

[0008] (1) All places requiring extremely low humidity conditions (15% ± 2%);

[0009] (2) A location that requires stable temperature and humidity (±1%).

[0010] There are currently no reports of such refrigeration and dehumidification products in the industry.

[0011] In addition, the current method for obtaining low humidity (15% ± 2%) is:

[0012] Use refrigeration and dehumidification (mostly dehumidifier + refrigeration equipment) to create an external space environment (humidity around 25%):

[0013] Build an internal space environment, and then use the rotary dehumidification method based on adsorption dehumidification to achieve dehumidification. The energy consumption is very huge (the adsorbent needs to be transported to the outside by the rotary wheel and then dried by electric heating before entering the next cycle again). The adsorbent needs to be replaced regularly, and the temperature and humidity fluctuate greatly. The disadvantages are obvious, but it is currently the only mature option.

[0014] Therefore, it is necessary to design a new type of refrigeration and dehumidification system. Utility Model Content

[0015] The technical problem to be solved by the utility model is to provide a refrigeration and dehumidification system based on dual air ducts, which can effectively ensure the uniformity of (temperature) and humidity in the warehouse, realize temperature and humidity control, and promote the efficiency of the original refrigeration and dehumidification system and create a lower humidity environment (for example, when there is no duct system, the system dehumidifies to 18% and it is difficult to reduce it. After using the duct system, it can reach about 13%, and the temperature and humidity fluctuation range is small).

[0016] The technical solution of the utility model is as follows:

[0017] A refrigeration and dehumidification system based on double air ducts, comprising a refrigeration and dehumidification machine, a fan and a circulation air duct;

[0018] The fan includes an internal circulation fan and an external circulation fan;

[0019] The circulation air duct includes an inner circulation air duct and an outer circulation air duct;

[0020] The internal circulation fan is used to promote the circulation of air in the internal circulation duct and cold storage;

[0021] The external circulation fan is used to promote the circulation of air in the external circulation duct and cold storage;

[0022] The main unit of the refrigeration and dehumidifier is set in the cold storage, and the circulating air duct is set along the inner wall of the cold storage;

[0023] The refrigeration dehumidifier includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the cold storage; the compressor and the condenser are both arranged outside the cold storage; the condenser is connected to the expansion valve through a pipeline via a second valve (220V solenoid valve), and the expansion valve is then connected to the evaporator through a pipeline.

[0024] The specific working process is:

[0025] The compressor sucks in low-temperature, low-pressure gas and compresses it into high-temperature, high-pressure gas → Condenser: condenses the high-temperature, high-pressure gas into liquid at room temperature → Expansion valve: converts the high-pressure liquid into a low-temperature, low-pressure gas-liquid mixture and sends it to the evaporator → Evaporator: further evaporates the gas-liquid mixture into low-temperature, low-pressure gas. This process absorbs heat.

[0026] It also includes a speed regulator controlled by the control module; the speed regulator is used to control the speed of the evaporator fan; it also includes a temperature sensor and a humidity sensor connected to the control module; the control module is used to reduce the speed of the evaporator fan through the speed regulator when the temperature of the cold storage is reduced to a preset temperature to start the dehumidification process.

[0027] An auxiliary radiator is installed in the circulating air duct in the cold storage as a waste heat recovery device; a first valve controlled by the control module is installed on the connecting pipe between the auxiliary radiator and the compressor. After the first valve is opened, the waste heat of the compressor can be fully utilized. The first valve is a 220V solenoid valve.

[0028] A standby electric heating compensation device is provided indoors; the standby electric heating compensation device is an electric heating tube, which is arranged in the evaporator, utilizing the housing space of the evaporator and its fan, without occupying extra space, and is controlled by the control module. The heating tube can also be preferably arranged outside the evaporation fin of the evaporator to create a better condensation environment. The heating tube can also be arranged outside the outer shell of the evaporator.

[0029] The side wall of the cold storage has a first interlayer, the top of the cold storage has a second interlayer, the side wall and the top plate of the cold storage are provided with air holes, the air holes are used to connect the first interlayer and the second interlayer with the middle cavity of the cold storage; the first interlayer is connected with the second interlayer; the first interlayer, the second interlayer and the air holes form the circulating air duct;

[0030] The fan is arranged in the first interlayer or the second interlayer, or the fan is arranged outside the air hole (not in the interlayer, but in the cold storage).

[0031] The root of the side wall is provided with a bottom inner circulation air hole and a bottom outer circulation air hole; the bottom inner circulation air hole is located above the bottom outer circulation air hole;

[0032] The top plate of the cold storage is equipped with top internal circulation air holes and top external circulation air holes;

[0033] The top inner circulation air hole, the second interlayer, the first interlayer and the bottom inner circulation air hole form the inner circulation air duct;

[0034] The top external circulation air holes, the second interlayer, the first interlayer and the bottom external circulation air holes form the external circulation air duct.

[0035] The internal circulation fan is arranged below the internal circulation air hole at the top; the external circulation fan is arranged at the external circulation air hole at the top and is located on the outside of the second interlayer.

[0036] The number of the circulating air ducts is 2 or 4; and they are relatively symmetrically arranged (i.e., the front and rear side walls are arranged, and / or

[0037] Or set on the left and right side walls). It is also possible to configure more circulation ducts to meet the use requirements according to irregular environments. For example, 3-10 groups of circulation ducts are all possible.

[0038] The fans are all controlled by the control module.

[0039] The refrigeration dehumidifier is arranged on the top of the cold storage, and the air outlet of the dehumidifier is connected with the external circulation air hole at the top of the external circulation air duct.

[0040] The above-mentioned refrigeration and dehumidification system can ensure uniform temperature and humidity distribution in the cold storage through internal and external circulation dual air ducts, waste heat recovery, and auxiliary heating.

[0041] The control module controls the operating conditions of the refrigeration and dehumidifier so that the temperature and humidity in the cold storage are within the preset range;

[0042] After starting the refrigeration and dehumidification unit, the PLC (control module) is used to control the optimal air volume and wind speed required for different dehumidification stages. The indoor air is inhaled through the external circulation duct system for dehumidification processing and then sent to multiple different locations indoors; the internal circulation duct is started simultaneously to keep the indoor air in a state of continuous and uniform flow; the two air flows meet and communicate in a relatively fixed area, so that new dry air continuously enters the internal circulation system, and at the same time, part of the air enters the refrigeration and dehumidification machine for further processing into drier air. The specific control process is a function of the control module (single-chip microcomputer), so this solution does not involve methods.

[0043] Beneficial effects:

[0044] The dual-duct refrigeration and dehumidification system of the utility model is equipped with one or more sets of internal circulation air duct systems in specific occasions such as cold storage, uses universal fans as power, and adopts top-in and bottom-out or bottom-in and top-out methods to make the air in the warehouse flow fully, greatly reduce the temperature and humidity dead corners in the warehouse, and effectively improve the uniformity of temperature and humidity in the warehouse.

[0045] By adopting this system, all types of refrigeration equipment with normal configuration can be directly transformed into refrigeration and dehumidification equipment, saving the purchase cost and operating cost of a separate dehumidifier system, as well as the purchase cost and operating cost of the refrigeration equipment that need to be increased due to the heat generated by the balancing dehumidifier. The energy-saving and emission-reduction effects and cost-saving benefits are very significant.

[0046] By configuring a waste heat recovery device for refrigeration equipment indoors to balance the temperature drop caused by refrigeration and dehumidification, not only can rapid dehumidification be achieved, but energy consumption can also be saved.

[0047] In order to obtain ultra-low humidity and maintain the stability of ultra-low humidity, and to overcome the adverse effects of low ambient temperature and to overcome the temperature balance that cannot be achieved under the premise of using the waste heat of the unit, the standby electric heating compensation is started. The electric heating compensation is controlled by the PLC program, and the maximum current is automatically operated when the thermal compensation power is below 80% (the anti-dry burning type of the thermal compensation electric heating tube is generally 100% power when powered on. Although its design has its own safety factor, the adjustment system operates on demand according to the heat demand and is limited to 0-80%, further ensuring that it does not exceed the temperature and current, and further reducing the fire risk caused by overheating from the design), with a high safety factor.

[0048] The utility model uses traditional standard refrigeration equipment, which only needs to be slightly adjusted and customized according to different humidity requirements, does not require the production of professional equipment, and is conducive to making full use of existing social production resources.

[0049] Due to its refrigeration and dehumidification characteristics and PLC technology, the unit operates within the rated conditions for a long time, greatly extending its operating life.

[0050] The utility model can greatly improve the uniformity of temperature and humidity in a specific constant temperature and humidity place in a warehouse, and meet the needs of a high-precision constant temperature and humidity place.

[0051] By adopting the system of the utility model, the humidity can reach a stable state of 15%±1°C.

[0052] The core principle of the present invention is that when realizing dehumidification control, in order to reduce energy consumption, the temperature in the cold storage is raised by waste heat recovery in a priority manner. If necessary, the heating pipe is started to raise the temperature in the cold storage to balance the temperature drop caused by dehumidification. In the present invention: dehumidification is highlighted first, and refrigeration is a by-product of the dehumidification process (normal cold storage refrigeration equipment has a radiator outside the warehouse. If there is no heat supplement during the dehumidification process, the temperature must be a falling process; the general standard dehumidifier is designed as an integrated unit. Considering the energy efficiency loss, the cooling capacity is less than the heat generated by the unit, and the temperature rises. A refrigeration unit is needed to balance this heat. This is essentially different from our refrigeration and dehumidification unit. Therefore, the refrigeration and dehumidification unit is designed to recover waste heat to balance the temperature in the warehouse and obtain the cheapest heat source; if it is not enough to balance, a little electric heat is used to balance it - this is the core of the present invention.

[0053] The essential differences between the present invention and the prior art are as follows: 1. The main function of the refrigeration equipment is to reduce the air in the enclosed space to the required temperature, with a certain dehumidification effect, but it is not obvious and has no actual commercial value; 2. The refrigeration and dehumidification equipment is the opposite: through various measures to create an ideal dehumidification environment, the refrigeration temperature is reduced and becomes a by-product, which is equivalent to saving all the power consumption of the traditional dehumidifier, so the energy-saving effect is significant; 3. The use of the present invention is equivalent to dividing the traditional dehumidifier into an internal dehumidifier and an external dehumidifier, and the control module determines whether the heat generated by the external dehumidifier is discharged into the outside air or recovered for use in the warehouse.

[0054] Practice has proved that the application of the utility model can achieve the effects of refrigeration and dehumidification, and the energy-saving effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the overall structure of the refrigeration and dehumidification system based on double air ducts (top view);

[0056] Figure 2 It is a schematic diagram of the overall structure of the refrigeration and dehumidification system based on double air ducts (left view);

[0057] Figure 3 It is a schematic diagram of the overall structure of the refrigeration and dehumidification system based on double air ducts (main view);

[0058] Figure 4 It is the humidity change curve.

[0059] Explanation of reference numerals: 1-second interlayer, 2-dehumidifier, 31-internal circulation fan, 32-external circulation fan; 4-first interlayer, 51-bottom internal circulation air hole, 52-bottom external circulation air hole, 53-top internal circulation air hole, 54-top external circulation air hole. 61-internal circulation air duct, 62-external circulation air duct. 7-compressor unit, 8-first valve, 9-waste heat recovery pipe, 10-evaporator pipe, 11-expansion valve, 12-second valve. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0061] Example 1: Figure 1-4 , a refrigeration and dehumidification system based on double air ducts, including a refrigeration and dehumidification machine, a fan and a circulation air duct;

[0062] The fan includes an internal circulation fan and an external circulation fan;

[0063] The circulation air duct includes an inner circulation air duct and an outer circulation air duct;

[0064] The internal circulation fan is used to promote the circulation of air in the internal circulation duct and cold storage;

[0065] The external circulation fan is used to promote the circulation of air in the external circulation duct and cold storage;

[0066] The main unit of the refrigeration and dehumidifier is set in the cold storage, and the circulating air duct is set along the inner wall of the cold storage;

[0067] The refrigeration dehumidifier includes a refrigeration device and a control module; the refrigeration device includes a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the cold storage; the compressor and the condenser are both arranged outside the cold storage; the condenser is connected to the expansion valve through a pipeline via a second valve (220V solenoid valve), and the expansion valve is then connected to the evaporator through a pipeline.

[0068] The specific working process is:

[0069] The compressor sucks in low-temperature, low-pressure gas and compresses it into high-temperature, high-pressure gas → Condenser: condenses the high-temperature, high-pressure gas into liquid at room temperature → Expansion valve: converts the high-pressure liquid into a low-temperature, low-pressure gas-liquid mixture and sends it to the evaporator → Evaporator: further evaporates the gas-liquid mixture into low-temperature, low-pressure gas. This process absorbs heat.

[0070] It also includes a speed regulator controlled by the control module; the speed regulator is used to control the speed of the evaporator fan; it also includes a temperature sensor and a humidity sensor connected to the control module; the control module is used to reduce the speed of the evaporator fan through the speed regulator when the temperature of the cold storage is reduced to a preset temperature to start the dehumidification process.

[0071] An auxiliary radiator is installed in the circulating air duct in the cold storage as a waste heat recovery device; a first valve controlled by the control module is installed on the connecting pipe between the auxiliary radiator and the compressor. After the first valve is opened, the waste heat of the compressor can be fully utilized. The first valve is a 220V solenoid valve.

[0072] A standby electric heating compensation device is provided indoors; the standby electric heating compensation device is an electric heating tube, which is arranged in the evaporator, utilizing the housing space of the evaporator and its fan, without occupying extra space, and is controlled by the control module. The heating tube can also be preferably arranged outside the evaporation fin of the evaporator to create a better condensation environment. The heating tube can also be arranged outside the outer shell of the evaporator.

[0073] The side wall of the cold storage has a first interlayer, the top of the cold storage has a second interlayer, the side wall and the top plate of the cold storage are provided with air holes, the air holes are used to connect the first interlayer and the second interlayer with the middle cavity of the cold storage; the first interlayer is connected with the second interlayer; the first interlayer, the second interlayer and the air holes form the circulating air duct;

[0074] The fan is arranged in the first interlayer or the second interlayer, or the fan is arranged outside the air hole (not in the interlayer, but in the cold storage).

[0075] The root of the side wall is provided with a bottom inner circulation air hole and a bottom outer circulation air hole; the bottom inner circulation air hole is located above the bottom outer circulation air hole;

[0076] The top plate of the cold storage is equipped with top internal circulation air holes and top external circulation air holes;

[0077] The top inner circulation air hole, the second interlayer, the first interlayer and the bottom inner circulation air hole form the inner circulation air duct;

[0078] The top external circulation air holes, the second interlayer, the first interlayer and the bottom external circulation air holes form the external circulation air duct.

[0079] The internal circulation fan is arranged below the internal circulation air hole at the top; the external circulation fan is arranged at the external circulation air hole at the top and is located on the outside of the second interlayer.

[0080] The number of the circulating air ducts is 2 or 4; and they are relatively symmetrically arranged (i.e., the front and rear side walls are arranged, and / or

[0081] Or set on the left and right side walls). It is also possible to configure more circulation ducts to meet the use requirements according to irregular environments. For example, 3-10 groups of circulation ducts are all possible.

[0082] The fans are all controlled by the control module.

[0083] The refrigeration dehumidifier is arranged on the top of the cold storage, and the air outlet of the dehumidifier is connected with the external circulation air hole at the top of the external circulation air duct.

[0084] The requirements for temperature and humidity indicators of the Double 15 constant temperature and humidity laboratory are: 15℃±1℃ / 15%± / 1%:

[0085] When the preset storage temperature is T1 (T1 setting value is 16℃), the speed regulator is used to reduce the evaporator fan speed to R1 (R1 setting value is 410r / min~0r / min); when the preset storage temperature is T2 (T2 setting value is 15℃), the speed regulator is used to reduce the evaporator fan speed to R2 (R2 setting value is 270r / min~0r / min); when the temperature reaches the preset storage temperature T3 (setting value is 14℃), the speed regulator is used to reduce the evaporator fan speed to R3 (R3 setting value is 220r / min)~0r / min; T1>T2>T3, R1≥R2≥R3, the control module determines the appropriate speed of the control fan to 0r / min according to the optimal environmental factors required for dehumidification such as evaporation temperature.

[0086] No heating equipment is started before T1, waste heat recovery is started in the T1-T2 interval, and waste heat recovery and heating tube thermal compensation are started simultaneously in the T2-T3 interval (the heating tube automatically adjusts power in the range of 0-80% according to the required heat).

[0087] The following is a display of measured data:

[0088] Measured data of the constant temperature and humidity laboratory on May 3, 2023

[0089]

[0090] illustrate:

[0091] The evaporating temperature in the table is the evaporator temperature.

[0092] Overview of the constant temperature and humidity laboratory: 100mm thick double-sided color steel polyurethane insulation board hexahedron structure, 800mm wide × 1800mm high × 100mm thick double-sided color steel polyurethane insulation door, laboratory size 3000mm long × 2000mm wide × 2400mm high;

[0093] Constant temperature and humidity laboratory parameters (based on the above table data conditions)

[0094]

[0095]

[0096] illustrate:

[0097] This parameter is based on operating data under the conditions of temperature 14℃±1℃ and humidity 14%±1%. The set values ​​of temperature, temperature difference, humidity and humidity difference can be flexibly adjusted according to actual usage to meet the different usage requirements of constant temperature and humidity laboratories.

[0098] The parameters in the external circulation fan switch on control are -12 and -14, which means the evaporator is on at -14 degrees.

[0099] Stop at -12 degrees.

[0100] After the refrigeration and dehumidification equipment is started, one or more sets of circulation fans in the warehouse are started synchronously to transport the air in the warehouse from the high (or low) place in the warehouse to different positions in the low (or high) place in the warehouse through the air duct; after the refrigeration and dehumidification equipment is shut down, the fan circulation system can choose to shut down synchronously, or choose to delay shutdown according to different requirements to ensure the uniformity of temperature and humidity in the warehouse.

[0101] Under the control of the controller, the refrigeration and dehumidification equipment and the fan can be stopped at the same time or with a delay, and other control circulation fan working modes can be achieved. Its function is to meet the requirements of temperature difference and humidity difference in occasions with different temperature and humidity requirements.

[0102] Comparison table of cold storage dehumidification technology performance between the dehumidification system of the utility model and the existing dehumidification system

[0103]

[0104] It can be seen that the solution of the utility model has more accurate temperature and humidity control, and the number of equipment starts and stops is reduced, which is conducive to the long-term stable operation of the equipment.

[0105] like Figure 4 ,This curve is the operating curve of a certain day. It can be seen from the figure that the humidity reaches the set value after more than ten minutes of no-load operation.

[0106] Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims

1. A refrigeration and dehumidification system based on dual air ducts, characterized in that: Including refrigeration dehumidifier, fan and circulation duct; The fan includes an internal circulation fan and an external circulation fan; The circulation air duct includes an inner circulation air duct and an outer circulation air duct; The internal circulation fan is used to promote the circulation of air in the internal circulation duct and cold storage; The external circulation fan is used to promote the circulation of air in the external circulation duct and cold storage; The main unit of the refrigeration and dehumidifier is set in the cold storage, and the circulating air duct is set along the inner wall of the cold storage; The refrigeration dehumidifier comprises a refrigeration device and a control module; the refrigeration device comprises a compressor, a condenser, an evaporator and an expansion valve; an evaporator fan is provided at the evaporator; the evaporator and the evaporator fan are both arranged in the cold storage; the compressor and the condenser are both arranged outside the cold storage; It also includes a speed regulator controlled by the control module; the speed regulator is used to control the speed of the evaporator fan; and it also includes a temperature sensor and a humidity sensor connected to the control module.

2. The dual-duct refrigeration and dehumidification system according to claim 1 is characterized in that: An auxiliary radiator is arranged in the circulating air duct in the cold storage as a waste heat recovery device; a first valve controlled by a control module is arranged on the connecting pipeline between the auxiliary radiator and the compressor.

3. The dual-duct refrigeration and dehumidification system according to claim 2 is characterized in that: A standby electric heating compensation device is arranged indoors; the standby electric heating compensation device is an electric heating tube, the heating tube is arranged in the evaporator, and the heating tube is controlled by the control module.

4. The refrigeration and dehumidification system based on dual air ducts according to claim 1 is characterized in that: The side wall of the cold storage has a first interlayer, the top of the cold storage has a second interlayer, the side wall and the top plate of the cold storage are provided with air holes, the air holes are used to connect the first interlayer and the second interlayer with the middle cavity of the cold storage; the first interlayer is connected with the second interlayer; the first interlayer, the second interlayer and the air holes form the circulating air duct; The fan is arranged in the first interlayer or the second interlayer, or the fan is arranged outside the air hole.

5. The dual-duct refrigeration and dehumidification system according to claim 4 is characterized in that: A bottom inner circulation air hole (51) and a bottom outer circulation air hole (52) are provided at the root of the side wall; the bottom inner circulation air hole is located above the bottom outer circulation air hole; The top plate of the cold storage is provided with a top inner circulation air hole (53) and a top outer circulation air hole (54); The top inner circulation air hole, the second interlayer, the first interlayer and the bottom inner circulation air hole form the inner circulation air duct; The top external circulation air holes, the second interlayer, the first interlayer and the bottom external circulation air holes form the external circulation air duct.

6. The refrigeration and dehumidification system based on double air ducts according to claim 5 is characterized in that: The internal circulation fan is arranged below the internal circulation air hole at the top; the external circulation fan is arranged at the external circulation air hole at the top and is located on the outside of the second interlayer.

7. The dual-duct refrigeration and dehumidification system according to claim 4, characterized in that: The number of the circulating air ducts is 2 or 4, and they are arranged relatively symmetrically.

8. The refrigeration and dehumidification system based on dual air ducts according to claim 4 is characterized in that: Both the internal circulation fan and the external circulation fan are controlled by the control module.

9. The refrigeration and dehumidification system based on double air ducts according to claim 4 is characterized in that: The refrigeration dehumidifier is arranged on the top of the cold storage, and the air outlet of the dehumidifier is connected with the external circulation air hole at the top of the external circulation air duct.

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