Energy-saving rotary dehumidification system and control method

Abstract

This invention relates to the field of air conditioning and discloses an energy-saving rotary dehumidification system and control method. The system includes a fresh air duct, a cooling air duct, a regeneration air duct, a rotary dehumidification unit, a coupled heat pump unit, a deep dehumidification unit, an inlet pipe, and an outlet pipe. The deep dehumidification unit includes a third condenser, a third compressor, a third evaporator, and a fourth throttling device. The third condenser, the third compressor, the third evaporator, and the fourth throttling device are connected end to end. The inlet of the third condenser is connected to the inlet pipe, and the outlet of the third condenser is connected to the outlet pipe. This system adopts a multi-stage direct expansion coupled evaporation combined with deep refrigeration segmented composite dehumidification technology, changing the ratio of refrigeration dehumidification to adsorption dehumidification, increasing the ratio from less than 3:1 in the traditional system to more than 6:1, removing more moisture before it enters the first dehumidification wheel, making the system more energy-efficient.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and more particularly to an energy-saving rotary dehumidification system and control method. Background Technology

[0002] Traditional rotary dehumidifiers use a desiccant or molecular sieve desiccant core to absorb water molecules in the treatment zone. After being transferred to the irregular growth zone, the desiccant needs to be desorbed at a high temperature of about 130°C, which requires a large amount of high-grade energy and has a high energy consumption.

[0003] The dehumidification process of a rotary dehumidifier is a systematic project. Generally, the initial fresh air is dehumidified by refrigeration and condensation (relative humidity 30% to 20%). After refrigeration and dehumidification, the fresh air is mixed with the primary return air and then dehumidified by a primary dehumidifier core to a low dew point range (dew point temperature -10 to -40℃). If it is necessary to treat it to an ultra-low dew point range (dew point temperature -40 to -70℃), a secondary dehumidifier core is added for ultra-low humidity adsorption. Corresponding to the primary and secondary dehumidifier cores are primary regeneration and desorption, and secondary regeneration and desorption.

[0004] Traditional rotary dehumidifiers employ technologies and methods such as heat recovery for energy saving, low-grade heat energy regeneration preheating, and increasing the volume of the dehumidifier core per unit air volume. While these can bring about energy-saving effects, if the treatment ratio of refrigeration dehumidification and adsorption dehumidification remains unchanged, the energy consumption of primary and secondary dehumidifier core regeneration accounts for a large proportion (over 65%). Even with the above-mentioned energy-saving technologies, the energy-saving effect is limited, generally within 20%. Summary of the Invention

[0005] The first objective of this invention is to provide an energy-saving rotary dehumidification system that aims to solve the technical problem of limited energy-saving effect of traditional rotary dehumidifiers.

[0006] To achieve the above objectives, the solution provided by the present invention is as follows:

[0007] An energy-saving rotary dehumidification system includes a fresh air duct, a cooling air duct, a regeneration air duct, a rotary dehumidification unit, a coupled heat pump unit, a deep dehumidification unit, an inlet pipe, and an outlet pipe;

[0008] The rotary dehumidification unit includes a first dehumidification wheel, a second dehumidification wheel, a surface cooler, an air booster, a first evaporator, a temperature-regulating heat exchanger, a temperature-regulating heating device, a first condenser, a first compressor, a first throttling device, a secondary regeneration heating device, a primary regeneration heating device, and a regeneration fan. The first dehumidification wheel and the second dehumidification wheel are respectively installed on the fresh air duct and the regeneration duct.

[0009] The coupled heat pump unit includes a first control valve, a second control valve, and a first heat exchanger, a second throttling device, a second evaporator, a second compressor, a second condenser, a first dehumidifier wheel, and a third throttling device connected in sequence from end to end; the first control valve is connected in parallel on both sides of the second throttling device, and the second control valve is connected in parallel on both sides of the third throttling device;

[0010] The deep dehumidification unit includes a third condenser, a third compressor, a third evaporator, and a fourth throttling device connected in sequence. The water inlet of the third condenser is connected to the water inlet pipe, and the water outlet of the third condenser is connected to the water outlet pipe.

[0011] The first heat exchanger, the surface cooler, the third condenser, the first dehumidifying wheel, the air booster, the first evaporator, the second dehumidifying wheel, the temperature-regulating heat exchanger, and the temperature-regulating heating device are sequentially arranged on the fresh air duct. The outlet of the fresh air duct is used to connect to the clean drying room. The water inlets of the surface cooler and the temperature-regulating heat exchanger are respectively connected to the water inlet pipe, and the water outlets of the surface cooler and the temperature-regulating heat exchanger are respectively connected to the water outlet pipe. The first condenser, the first compressor, the secondary regeneration heating device, the second condenser, the primary regeneration heating device, the second evaporator, and the regeneration fan are sequentially arranged on the regeneration duct along the regeneration direction. The first compressor, the first condenser, the first throttling device, and the first evaporator are connected end to end. One end of the cooling duct is connected to the fresh air duct and is located between the air booster and the first evaporator, and the other end is connected to the regeneration duct through the second dehumidifying wheel.

[0012] Preferably, the coupled heat pump unit further includes a first gas-liquid separator, and the deep dehumidification unit further includes a second gas-liquid separator. The first gas-liquid separator is disposed between the second evaporator and the second compressor, and the second gas-liquid separator is disposed between the third compressor and the third evaporator.

[0013] Preferably, proportional regulating valves are respectively provided at the water inlet of the surface cooler, the water inlet of the temperature regulating heat exchanger, and the water inlet of the third condenser.

[0014] Preferably, it further includes a fresh air valve, a fresh air exhaust valve, and a regeneration exhaust valve, wherein the fresh air valve is located at the inlet of the fresh air duct, the fresh air exhaust valve is located at the outlet of the fresh air duct, and the regeneration exhaust valve is located at the outlet of the regeneration duct.

[0015] Preferably, a pre-filter is provided between the fresh air valve and the first heat exchanger, and a medium-efficiency filter is provided between the temperature-regulating heat exchanger and the second dehumidifying wheel.

[0016] Preferably, it also includes a return air duct connected to the fresh air duct, the return air duct being located between the first dehumidifying wheel and the air pressurization device, the end of the return air duct away from the fresh air duct being used to connect to the clean drying room, and a return air valve being provided on the return air duct.

[0017] The second objective of this invention is to provide a control method for an energy-saving rotary dehumidifier system, characterized in that the control method is used to implement the operation control of the energy-saving rotary dehumidifier system as described above, and the control method includes:

[0018] Real-time acquisition of ambient fresh air dry-bulb temperature and ambient fresh air humidity;

[0019] When the ambient fresh air dry-bulb temperature is >9℃ or the ambient fresh air moisture content is >6.8g / kg, the energy-saving rotary dehumidification system switches to summer operation mode, the coupled heat pump unit control switches to cooling mode, the deep dehumidification unit starts, and when water is detected in the inlet and outlet pipes and the air pressurization device is turned on, the third condenser and the fourth throttling device are turned on, and the third compressor is started. The fourth throttling device aims to control the temperature of the outlet side of the third evaporator, and ensures the minimum operating pressure difference between the evaporator side and the condenser side by controlling the condensation temperature of the third condenser.

[0020] When the ambient fresh air dry-bulb temperature is ≤9℃ or the ambient fresh air humidity is ≤6.8g / kg, the energy-saving rotary dehumidification system switches to winter operation mode, the coupled heat pump unit control switches to heating mode, and the deep dehumidification unit does not operate.

[0021] Preferably, when the energy-saving rotary dehumidifier system switches to summer operation mode, the proportional regulating valve at the inlet of the third condenser opens to a preset opening degree of 10%, and the fourth throttling device opens to a preset opening degree of 30%.

[0022] Preferably, when the coupled heat pump unit is switched to cooling mode, the first heat exchanger enters evaporative cooling mode, the second evaporator stops operating, the second control valve and the second throttling device are closed, and the first control valve, the third throttling device, and the second compressor are opened. The third throttling device performs PID adjustment according to the control target of the first preset temperature and the preset relative humidity value. The second compressor transfers the heat from the processing area to the second condenser and releases it to the regeneration side for regeneration heating. The first-stage regeneration heating device is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifier wheel. When the coupled heat pump unit is switched to heating mode, the surface cooler stops operating, the first control valve and the third throttling device are closed, and the second control valve, the second throttling device, and the second compressor are opened. The second throttling device performs PID adjustment according to the control target of the second preset temperature. The first-stage regeneration heating device is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifier wheel.

[0023] Preferably, the coupled heat pump unit is switched to heating mode, the surface cooler stops running, the first control valve and the third throttling device are closed, the second control valve, the second throttling device and the second compressor are opened, the second throttling device is opened to a preset opening degree of 10%, the second throttling device is PID regulated according to the control target of the second preset temperature, the first-stage regenerative heating device is used for regeneration temperature compensation, and PID regulated according to the outlet air humidity after the first dehumidification wheel.

[0024] The energy-saving rotary dehumidification system provided by this invention includes a fresh air duct, a cooling air duct, a regeneration air duct, a rotary dehumidification unit, a coupled heat pump unit, and a deep dehumidification unit. It adopts a multi-stage direct expansion coupled evaporation combined with deep refrigeration segmented composite dehumidification technology, changing the ratio of refrigeration dehumidification to adsorption dehumidification, reducing the moisture content of fresh air from 30.7 g / kg to 4.5 g / kg. Then, adsorption dehumidification is carried out by the first and second dehumidification wheels to reduce the moisture content to low and ultra-low dew points. The ratio of refrigeration dehumidification to adsorption dehumidification is increased from less than 3:1 in the traditional method to more than 6:1, removing more moisture before it enters the first dehumidification wheel, making the system more energy-efficient. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the energy-saving rotary dehumidification system provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the coupled heat pump unit provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the deep dehumidification unit provided in an embodiment of the present invention;

[0029] Figure 4 This is a flowchart of the control method for the energy-saving rotary dehumidifier system provided in an embodiment of the present invention.

[0030] Explanation of icon numbers:

[0031] 1. Fresh air valve; 2. Pre-filter; 3. First control valve; 4. Second throttling device; 5. First heat exchanger; 6. Surface cooler; 7. Water outlet pipe; 8. Water inlet pipe; 9. Proportional regulating valve; 12. First dehumidifying impeller; 13. First-stage rotary drive motor; 14. Return air valve; 15. Return air duct; 16. Air booster device; 17. Cooling air duct; 18. First evaporator; 19. Second dehumidifying impeller; 20. Second-stage rotary drive motor; 21. Medium-efficiency filter; 22. Temperature-regulating heat exchanger; 24. Temperature-regulating heating device; 25. Clean drying room; 26. First condenser; 27. First compressor; 28. Secondary regenerative heating device; 29. ​​First throttling device; 30. Second condenser; 31. Primary regenerative heating device; 32. Second compressor; 33. Third throttling device; 34. Second control valve; 35. Second evaporator; 36. Regenerative fan; 37. Regenerative exhaust valve; 38. Fresh air exhaust valve; 39. First gas-liquid separator; 42. Third condenser; 43. Third compressor; 44. Second gas-liquid separator; 45. Third evaporator; 46. Fourth throttling device; 100. Coupled heat pump unit; 200. Deep dehumidification unit; 300. Fresh air duct; 400. Regenerative air duct. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0035] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0036] like Figures 1 to 3 As shown, this is an energy-saving rotary dehumidification system according to an embodiment of the present invention.

[0037] Please see Figures 1-3 The energy-saving rotary dehumidification system of this invention includes a fresh air duct 300, a cooling air duct 17, a regeneration air duct 400, a rotary dehumidification unit, a coupled heat pump unit 100, a deep dehumidification unit 200, an inlet pipe 8, and an outlet pipe 7.

[0038] The rotary dehumidification unit includes a first dehumidification wheel 12, a second dehumidification wheel 19, a surface cooler 6, an air pressurization device 16, a first evaporator 18, a temperature-regulating heat exchanger 22, a temperature-regulating heating device 24, a first condenser 26, a first compressor 27, a first throttling device 29, a secondary regeneration heating device 28, a primary regeneration heating device 31, and a regeneration fan 36. The first dehumidification wheel 12 and the second dehumidification wheel 19 are respectively installed on the fresh air duct 300 and the regeneration air duct 400.

[0039] The coupled heat pump unit 100 includes a first heat exchanger 5, a first control valve 3, a second control valve 34, a second throttling device 4, a third throttling device 33, a second evaporator 35, a second compressor 32, and a second condenser 30. The first heat exchanger 5, the second throttling device 4, the second evaporator 35, the second compressor 32, the second condenser 30, the first dehumidifying wheel 12, and the third throttling device 33 are connected end to end in sequence. The first control valve 3 is connected in parallel on both sides of the second throttling device 4, and the second control valve 34 is connected in parallel on both sides of the third throttling device 33.

[0040] The deep dehumidification unit 200 includes a third condenser 42, a third compressor 43, a third evaporator 45 and a fourth throttling device 46. The third condenser 42, the third compressor 43, the third evaporator 45 and the fourth throttling device 46 are connected end to end. The water inlet of the third condenser 42 is connected to the water inlet pipe 8 and the water outlet of the third condenser 42 is connected to the water outlet pipe 7.

[0041] The first heat exchanger 5, surface cooler 6, third condenser 42, first dehumidifier wheel 12, air pressurization device 16, first evaporator 18, second dehumidifier wheel 19, temperature-regulating heat exchanger 22, and temperature-regulating heating device 24 are sequentially arranged on the fresh air duct 300. The outlet of the fresh air duct 300 is used to connect to the clean drying room 25. The water inlet of the surface cooler 6 and the water inlet of the temperature-regulating heat exchanger 22 are respectively connected to the water inlet pipe 8, and the water outlet of the surface cooler 6 and the water outlet of the temperature-regulating heat exchanger 22 are respectively connected to the water outlet pipe 7. The first condenser 26... The first compressor 27, the second-stage regeneration heating device 28, the second condenser 30, the first-stage regeneration heating device 31, the second evaporator 35, and the regeneration fan 36 are arranged sequentially on the regeneration air duct 400 along the regeneration direction. The first compressor 27, the first condenser 26, the first throttling device 29, and the first evaporator 18 are connected end to end. One end of the cooling air duct 17 is connected to the fresh air duct 300 and is located between the air pressurization device 16 and the first evaporator 18. The other end is connected to the regeneration air duct 400 through the second dehumidifying wheel 19.

[0042] In this embodiment, the first heat exchanger 5 is an evaporator; in other embodiments, the first heat exchanger 5 may also be a condenser.

[0043] In this embodiment, the air booster device 16 is a booster fan used to boost air pressure and enhance air power.

[0044] In this embodiment, the first control valve 3, the second control valve 34, and the third control valve 53 are all proportional regulating ball valves.

[0045] In this embodiment, the first dehumidifying wheel 12 is connected to a primary rotary drive motor 13, and the second dehumidifying wheel 19 is connected to a secondary rotary drive motor 20. The primary rotary drive motor 13 drives the first dehumidifying wheel 12 to rotate, thereby adsorbing water vapor in the air. The secondary rotary drive motor 20 drives the second dehumidifying wheel 19 to rotate, thereby adsorbing water vapor in the air and further improving the dehumidification effect.

[0046] In this embodiment, the third condenser 42 is a water-cooled condenser.

[0047] In this embodiment, the deep dehumidification unit 200 can cool the fresh air passing through the surface cooler 6 to a preset temperature and preset humidity (for example, in summer operation mode, the deep dehumidification unit 200 operates to process the fresh air to 3°C and 95% relative humidity), while realizing the reuse of energy in the heat pump cycle, improving the system's energy efficiency and reducing energy consumption costs.

[0048] In this embodiment, when the energy-saving rotary dehumidification system switches to summer operation mode, the coupled heat pump unit 100 switches to cooling mode. The coupled heat pump unit 100 transfers heat from the processing area of ​​the first dehumidification wheel 12 to the regeneration area of ​​the first dehumidification wheel 12, thereby achieving local temperature control during summer operation and balancing cold and heat. This bidirectional energy use maximizes energy saving.

[0049] In this embodiment, when the coupled heat pump unit 100 is switched to the cooling mode, the first heat exchanger 5 enters the evaporative cooling mode, the second evaporator 35 stops running, the second control valve 34 and the second throttling device 4 are closed, the first control valve 3 and the third throttling device 33 are opened, and then the second compressor 32 is turned on. The third throttling device 33 performs PID adjustment according to the control target of 17°C and 95% relative humidity. The second compressor 32 continuously transfers the heat from the processing area to the second condenser 30 and releases it to the regeneration side for regeneration heating. The first-stage regeneration heating device 31 is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifying wheel 12.

[0050] Specifically, when the energy-saving rotary dehumidifier system switches to summer operation mode, the first heat exchanger 5 operates the evaporative cooling function to treat the fresh air to 17℃ / 95%; the surface cooler 6 treats the fresh air to 9℃ / 95%; the deep dehumidification unit 200 continues to treat the fresh air to 3℃ / 95%; then it enters the first dehumidification wheel 12 for adsorption dehumidification, mixes with the return air from the clean drying room 25, and is drawn in by the air pressurization device 16 to increase air pressure and improve airflow; a small portion of low-humidity, low-temperature air is separated and enters the cooling air duct 17, recovers heat in the subcooled zone of the second dehumidifier wheel 19, and enters the regeneration air duct 400. Most of it flows along the processing zone channel, is temperature-controlled by the first evaporator 18, and then enters the processing zone of the second dehumidifier wheel 19 for adsorption dehumidification again to reach the target dew point set in the system; then it is treated by the temperature-regulating heat exchanger 22 to reach the target dry-bulb temperature set in the system, and finally reaches the temperature, cleanliness and ultra-low dew point set by the system, and is sent into the clean drying room 25. The regenerated air from the subcooled zone of the second dehumidifying wheel 19 passes through the first condenser 26. The heat absorbed by the first evaporator 18 is then transferred to the first condenser 26 by the first compressor 27, releasing heat to heat the regenerated air. This, combined with the secondary regeneration heating device 28, controls the regeneration temperature of the second dehumidifying wheel 19, ensuring accurate regeneration temperature and adjustable humidity based on the system settings. The regenerated air exiting the second dehumidifying wheel 19 still has a low humidity level and is used for primary regeneration. After passing through the second condenser 30, the heat absorbed in the first heat exchanger 5 is transferred to the second compressor 32 to heat the regenerated air exiting the second dehumidifying wheel 19. Similarly, this, combined with the primary regeneration heating device 31, controls the regeneration temperature of the first dehumidifying wheel 12, ensuring accurate regeneration temperature and adjustable humidity based on the dew point setting after the first dehumidifying wheel 12. The regenerated air exiting the first dehumidifying wheel 12 is then exhausted outdoors by the regeneration fan 36, completing the process of transferring moisture from the treatment area to the regeneration area for desorption and release. The second evaporator 35 is not used during summer operation.

[0051] When the energy-saving rotary dehumidifier system switches to winter operation mode, the coupled heat pump unit 100 switches to heating mode. The coupled heat pump unit 100 recovers and transfers heat from the regeneration zone of the first dehumidifier wheel 12 to the processing zone of the first dehumidifier wheel 12 and the air inlet of the first dehumidifier wheel 12 in the regeneration zone. By recovering the waste heat of the regeneration exhaust air, the system ensures preheating heat in winter and partially uses it for regeneration heating, achieving balanced heat distribution and high efficiency and energy saving.

[0052] In this embodiment, the coupled heat pump unit 100 is switched to heating mode, the surface cooler 6 stops running, the first control valve 3 and the third throttling device 33 are closed, and the second control valve 34, the second throttling device 4 and the second compressor 32 are opened. The second throttling device 4 is opened at a preset opening degree of 10%. The second throttling device 4 is PID-regulated according to the control target of the second preset temperature. The first-stage regenerative heating device 31 is used for regeneration temperature compensation and is PID-regulated according to the outlet air humidity after the first dehumidifying wheel 12.

[0053] Specifically, when the energy-saving rotary dehumidifier system switches to winter operation mode, the first heat exchanger 5 operates in fresh air preheating mode, and the second compressor 32 controls the operation target to ensure that the air temperature before entering the surface cooler 6 is ≥5℃, performing preheating and antifreeze functions. The surface cooler 6 and the deep dehumidification unit 200 stop operating. Fresh air enters the first dehumidifier wheel 12 for adsorption and dehumidification. After mixing with the return air from the clean drying room 25, it is drawn in by the air booster device 16 and pressurized to increase air power. A small portion of low-humidity and low-temperature air enters the cooling air duct 17, recovers heat in the subcooling zone of the second dehumidifier wheel 19, and then enters the regeneration air duct 400. Most of the low-humidity and low-temperature air flows along the processing zone channel, is temperature-controlled by the first evaporator 18, and then enters the processing zone of the second dehumidifier wheel 19 for adsorption and dehumidification again to reach the target dew point set in the system. It is then processed by the temperature-regulating heating device 24 to reach the target dry-bulb temperature set in the system, finally achieving the system's set temperature, cleanliness, and ultra-low dew point, and is then sent into the clean drying room 25. The regenerated air from the subcooled zone of the second dehumidifying wheel 19 passes through the first condenser 26. The heat absorbed by the first evaporator 18 is then transferred to the first condenser 26 by the first compressor 27, releasing heat to heat the regenerated air. This, combined with the secondary regeneration heating device 28, controls the regeneration temperature of the second dehumidifying wheel 19, ensuring accurate regeneration temperature and adjustable humidity according to the system settings. The regenerated air exiting the second dehumidifying wheel 19 still has a low humidity level and is used for primary regeneration. The second condenser 30 assists in heating the regenerated air, and together with the primary regeneration heating device 31, controls the regeneration temperature of the first dehumidifying wheel 12, ensuring accurate regeneration temperature and adjustable humidity according to the dew point setting after the first dehumidifying wheel 12. The regenerated air exiting the first dehumidifying wheel 12 is then exhausted outdoors by the regeneration fan 36, completing the process of transferring moisture from the treatment area to the regeneration area for desorption and release.

[0054] In this embodiment of the invention, the energy-saving rotary dehumidifier system adopts a multi-stage direct expansion coupling evaporation combined with deep refrigeration segmented composite dehumidification technology. It adopts a four-stage system, namely high-temperature direct expansion coupling, medium-temperature direct expansion coupling, surface cooling dehumidification and deep refrigeration dehumidification. Compared with traditional rotary dehumidifiers, the corresponding energy savings are 15%, 10%, 0% and 15%, respectively. The segmented composite dehumidification technology brings a comprehensive energy saving of more than 40%. The first heat exchanger 5 and the second condenser 30 each contain two stages: a high-temperature direct expansion coupling stage and a medium-temperature direct expansion coupling stage. When performing high-temperature direct expansion coupling, the first heat exchanger 5 is placed in the fresh air duct 300 to pre-cool the fresh air, and the outlet air of the first heat exchanger 5 is controlled at 25℃ / 95%. The second condenser 30 is placed in the regeneration zone of the first dehumidifier wheel 12 for primary air heating. When performing medium-temperature direct expansion coupling, the first heat exchanger 5 is placed in the fresh air duct 300 to re-cool the fresh air, and the outlet air of the first heat exchanger 5 is controlled at 17℃ / 95%. The second condenser 30 is placed in the regeneration zone of the first dehumidifier wheel 12 for secondary heating.

[0055] When performing surface cooling dehumidification, conventional 7-degree or 12-degree chilled water is used, and the temperature of the fresh air in the treatment area is controlled to be reduced to 9°C / 95% through the surface cooler 6.

[0056] When performing deep cooling and dehumidification, the third evaporator 45 is placed in the fresh air duct 300 to perform deep cooling treatment on the fresh air. The third evaporator 45 is controlled with the goal of 3℃ / 95% of the air outlet temperature.

[0057] The energy-saving rotary dehumidification system implemented in this invention includes a fresh air duct 300, a cooling air duct 17, a regeneration air duct 400, a rotary dehumidification unit, a coupled heat pump unit 100, and a deep dehumidification unit 200. It adopts a multi-stage direct expansion coupled evaporation combined with deep refrigeration segmented composite dehumidification technology, changing the ratio of refrigeration dehumidification to adsorption dehumidification, reducing the moisture content of fresh air from 30.7 g / kg to 4.5 g / kg, and then further treating it to low dew point and ultra-low dew point through adsorption dehumidification by the first dehumidification wheel 12 and the second dehumidification wheel 19. The treatment ratio of refrigeration dehumidification to adsorption dehumidification is increased from less than 3:1 in the traditional way to more than 6:1, removing more moisture before it enters the first dehumidification wheel 12, making the system more energy-efficient in dehumidification.

[0058] Please see Figure 1 and 2As shown, exemplarily, in some embodiments, the coupled heat pump unit 100 further includes a first gas-liquid separator 39, and the deep dehumidification unit 200 further includes a second gas-liquid separator 44. The first gas-liquid separator 39 is disposed between the second evaporator 35 and the second compressor 32, and the second gas-liquid separator 44 is disposed between the third compressor 43 and the third evaporator 45. By setting the first gas-liquid separator 39 and the second gas-liquid separator 44, liquid working fluid can be prevented from entering the second compressor 32, the third compressor 43 and other key components, reducing the risk of corrosion and damage and extending the service life of the equipment.

[0059] Please see Figure 1 and Figure 3 As shown, by way of example, in some embodiments, proportional regulating valves 9 are respectively provided at the inlet of the surface cooler 6, the inlet of the temperature regulating heat exchanger 22, and the inlet of the third condenser 42. By setting proportional regulating valves 9 at the inlet of the surface cooler 6, the inlet of the temperature regulating heat exchanger 22, and the inlet of the third condenser 42, precise control of the flow rate can be achieved, saving energy and improving the flexibility and stability of the system.

[0060] Please see Figure 1 As shown, by way of example, in some embodiments, the energy-saving rotary dehumidification system further includes a fresh air valve 1, a fresh air exhaust valve 38, and a regeneration exhaust valve 37. The fresh air valve 1 is located at the inlet of the fresh air duct 300, the fresh air exhaust valve 38 is located at the outlet of the fresh air duct 300, and the regeneration exhaust valve 37 is located at the outlet of the regeneration duct 400.

[0061] The fresh air valve 1 can adjust the intake of fresh air as needed, thereby regulating the fresh air exchange volume in the room. Reasonable control of the fresh air volume can reduce energy consumption, improve energy utilization efficiency, and help save energy and reduce emissions.

[0062] The fresh air exhaust valve 38 can adjust the amount of fresh air discharged as needed, thereby regulating the amount of fresh air exchanged indoors. Reasonable control of the fresh air volume can reduce energy consumption, improve energy utilization efficiency, and help save energy and reduce emissions.

[0063] Similarly, the regeneration exhaust valve 37 can effectively control the exhaust volume of the regeneration duct 400, realize energy recovery and reuse, and reasonably control the exhaust volume of the regeneration duct 400 can also improve the energy efficiency of the system and reduce energy waste.

[0064] Furthermore, a primary filter 2 is installed between the fresh air valve 1 and the first heat exchanger 5. Fresh air enters the unit from the fresh air valve 1 and undergoes air purification treatment in the primary filter 2. The primary filter 2 can effectively filter large particles and dust in the air, preventing these impurities from entering the first heat exchanger 5 and protecting the first heat exchanger 5 from damage.

[0065] Furthermore, a medium-efficiency filter 21 is installed between the temperature-regulating heat exchanger 22 and the second dehumidifying wheel 19. The low-humidity, low-temperature air that enters the processing area of ​​the second dehumidifying wheel 19 and is dehumidified again passes through the medium-efficiency filter 21 for clean filtration, and then is processed by the temperature-regulating heat exchanger 22 to reach the target dry-bulb temperature set in the system. The medium-efficiency filter 21 can effectively filter out smaller particulate matter and pollutants in the air, preventing them from entering the temperature-regulating heat exchanger 22 and protecting the temperature-regulating heat exchanger 22 from damage.

[0066] Please see Figure 1 As shown, by way of example, in some embodiments, the energy-saving rotary dehumidification system also includes a return air duct 15 connected to the fresh air duct 300. The return air duct 15 is located between the first dehumidification wheel 12 and the air pressurization device 16. The end of the return air duct 15 away from the fresh air duct 300 is used to connect to the clean drying room 25. By connecting the return air duct 15 to the fresh air duct 300, partial recycling of indoor air can be achieved, reducing energy consumption and improving energy efficiency.

[0067] Furthermore, a return air valve 14 is installed on the return air duct 15. By reasonably adjusting the opening degree of the return air valve 14, the energy consumption of the system can be effectively controlled, thereby achieving the purpose of energy saving.

[0068] Please see Figures 1-4 As shown, this embodiment of the invention also provides an energy-saving rotary dehumidification method, including:

[0069] S101. Real-time acquisition of ambient fresh air dry bulb temperature and ambient fresh air humidity content;

[0070] S102. When the ambient fresh air dry bulb temperature is >9℃ or the ambient fresh air moisture content is >6.8g / kg, the energy-saving rotary dehumidification system switches to summer operation mode, the coupled heat pump unit 100 switches to cooling mode, the deep dehumidification unit 200 starts, and when water is detected in the inlet pipe 8 and outlet pipe 7 and the air pressurization device 16 is opened, the third condenser 42 and the fourth throttling device 46 are opened, and the third compressor 43 is started. The fourth throttling device 46 aims to control the temperature of the outlet side of the third evaporator 45, and controls the condensing temperature of the third condenser 42 to ensure the minimum operating pressure difference between the evaporation side and the condensation side.

[0071] S103. When the ambient fresh air dry bulb temperature is ≤9℃ or the ambient fresh air humidity is ≤6.8g / kg, the energy-saving rotary dehumidification system switches to winter operation mode, the coupled heat pump unit 100 switches to heating mode, and the deep dehumidification unit 200 does not operate.

[0072] In this embodiment, the proportional regulating valve 9 at the inlet of the third condenser 42 is opened at a preset opening degree of 10%, and the fourth throttling device 46 is opened at a preset opening degree of 30%.

[0073] In this embodiment, when the coupled heat pump unit 100 is switched to cooling mode, the first heat exchanger 5 enters evaporative cooling mode, the second evaporator 35 stops operating, the second control valve 34 and the second throttling device 4 are closed, and the first control valve 3, the third throttling device 33 and the second compressor 32 are opened. The third throttling device 33 performs PID adjustment according to the control target of the first preset temperature and the preset relative humidity value. The second compressor 32 transfers the heat from the processing area to the second condenser 30 and releases it to the regeneration side for regeneration heating. The first-stage regeneration heating device 31 is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifying wheel 12. When the coupled heat pump unit 100 is switched to heating mode, the surface cooler 6 stops operating, the first control valve 3 and the third throttling device 33 are closed, and the second control valve 34, the second throttling device 4 and the second compressor 32 are opened. The second throttling device 4 performs PID adjustment according to the control target of the second preset temperature. The first-stage regeneration heating device 31 is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifying wheel 12.

[0074] Specifically, when the energy-saving rotary dehumidifier system switches to summer operation mode, fresh air enters the unit through fresh air valve 1 and undergoes air purification treatment in the primary filter 2. The first heat exchanger 5 operates the evaporative cooling function to treat the fresh air to 17℃ / 95%. The proportional regulating valve 9 at the inlet of the surface cooler 6 opens to treat the fresh air to 9℃ / 95%. The deep dehumidification unit 200 continues to treat the fresh air to 3℃ / 95%. Then, it enters the first dehumidification wheel 12 for adsorption dehumidification. After mixing with the return air from the clean drying room 25, it is drawn in by the air pressurization device 16 and pressurized. Aerodynamics: A small portion of the low-humidity, low-temperature air is separated and enters the cooling air duct 17. After recovering heat in the subcooled zone of the second dehumidification wheel 19, it enters the regeneration air duct 400. Most of the low-humidity, low-temperature air flows along the processing zone channel. After being temperature-controlled by the first evaporator 18, it enters the processing zone of the second dehumidification wheel 19 for further adsorption and dehumidification to reach the target dew point set in the system. Then, it is cleaned by the medium-efficiency filter 21 and processed by the temperature-regulating heat exchanger 22 to reach the target dry-bulb temperature set in the system. Finally, it reaches the temperature, cleanliness and ultra-low dew point set by the system and is sent into the clean drying room 25. The regenerated air from the subcooled zone of the second dehumidifying wheel 19 passes through the first condenser 26. The heat absorbed by the first evaporator 18 is then transferred to the first condenser 26 by the first compressor 27, releasing heat to heat the regenerated air. This, combined with the secondary regeneration heating device 28, controls the regeneration temperature of the second dehumidifying wheel 19, ensuring accurate regeneration temperature and adjustable humidity based on system settings. The regenerated air exiting the second dehumidifying wheel 19 still has a low humidity level and is used for primary regeneration. After passing through the second condenser 30, the heat absorbed in the first heat exchanger 5 is transferred to the regenerated air exiting the second dehumidifying wheel 19 via the second compressor 32. Similarly, this, combined with the primary regeneration heating device 31, controls the regeneration temperature of the first dehumidifying wheel 12, ensuring accurate regeneration temperature and adjustable humidity based on the dew point setting after the first dehumidifying wheel 12. The regenerated air exiting the first dehumidifying wheel 12 is then discharged outdoors by the regeneration fan 36 and regeneration exhaust valve 37, completing the transfer of moisture absorbed in the treatment area to the regeneration area for desorption and release. The second evaporator 35 is not used during summer operation.

[0075] In this embodiment, the coupled heat pump unit 100 is switched to heating mode, the surface cooler 6 stops running, the first control valve 3 and the third throttling device 33 are closed, and the second control valve 34, the second throttling device 4 and the second compressor 32 are opened. The second throttling device 4 is opened at a preset opening degree of 10%. The second throttling device 4 is PID-regulated according to the control target of the second preset temperature. The first-stage regenerative heating device 31 is used for regeneration temperature compensation and is PID-regulated according to the outlet air humidity after the first dehumidifying wheel 12.

[0076] Specifically, when the energy-saving rotary dehumidifier system switches to winter operation mode, fresh air enters the unit through fresh air valve 1 and undergoes air purification treatment in the primary filter 2. The first heat exchanger 5 operates in fresh air preheating mode, and the second compressor 32 controls the operating target to ensure that the air temperature before entering the surface cooler 6 is ≥5℃, performing preheating and antifreeze functions. The surface cooler 6 stops operating, and the proportional regulating valve 9 at the inlet of the surface cooler 6 is closed. The deep dehumidification unit 200 stops operating. Fresh air enters the first dehumidification wheel 12 for adsorption and dehumidification, and after mixing with the return air from the clean drying room 25, it is pressurized by the air booster. After being drawn in by the evaporator 16, the air pressure is increased to enhance the aerodynamics. A small portion of the low-humidity, low-temperature air is separated and enters the cooling air duct 17. After recovering heat in the subcooled zone of the second dehumidifier 19, it enters the regeneration air duct 400. Most of the low-humidity, low-temperature air flows along the processing zone channel. After being temperature-controlled and regulated by the first evaporator 18, it enters the processing zone of the second dehumidifier 19 for re-adsorption and dehumidification to reach the target dew point set in the system. Then, it is processed by the temperature-regulating heating device 24 to reach the target dry-bulb temperature set in the system. Finally, it reaches the temperature, cleanliness, and ultra-low dew point set by the system and is sent into the clean drying room 25. The regenerated air from the subcooled zone of the second dehumidifying wheel 19 passes through the first condenser 26. The heat absorbed by the first evaporator 18 is then transferred to the first condenser 26 by the first compressor 27, releasing heat to heat the regenerated air. This, combined with the secondary regeneration heating device 28, controls the regeneration temperature of the second dehumidifying wheel 19, ensuring accurate regeneration temperature and adjustable humidity according to the system settings. The regenerated air exiting the second dehumidifying wheel 19 still has a low humidity level and is used for primary regeneration. The second condenser 30 assists in heating the regenerated air, and together with the primary regeneration heating device 31, controls the regeneration temperature of the first dehumidifying wheel 12, ensuring accurate regeneration temperature and adjustable humidity according to the dew point setting after the first dehumidifying wheel 12. The regenerated air exiting the first dehumidifying wheel 12 is then discharged outdoors by the regeneration fan 36 and the regeneration exhaust valve 37, completing the transfer of moisture absorbed in the treatment area to the regeneration area for desorption and release.

[0077] In this embodiment, the first preset temperature is 17°C and the preset relative humidity is 95%.

[0078] In this embodiment, the second preset temperature is 5°C.

[0079] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy-saving rotary dehumidification system, characterized in that, It includes a fresh air duct, a cooling air duct, a regeneration air duct, a rotary dehumidifier unit, a coupled heat pump unit, a deep dehumidifier unit, an inlet water pipe, and an outlet water pipe; The rotary dehumidification unit includes a first dehumidification wheel, a second dehumidification wheel, a surface cooler, an air booster, a first evaporator, a temperature-regulating heat exchanger, a temperature-regulating heating device, a first condenser, a first compressor, a first throttling device, a secondary regeneration heating device, a primary regeneration heating device, and a regeneration fan. The first dehumidification wheel and the second dehumidification wheel are respectively installed on the fresh air duct and the regeneration duct. The coupled heat pump unit includes a first control valve, a second control valve, and a first heat exchanger, a second throttling device, a second evaporator, a second compressor, a second condenser, a first dehumidifier wheel, and a third throttling device connected in sequence from end to end; the first control valve is connected in parallel on both sides of the second throttling device, and the second control valve is connected in parallel on both sides of the third throttling device; The deep dehumidification unit includes a third condenser, a third compressor, a third evaporator, and a fourth throttling device connected in sequence. The water inlet of the third condenser is connected to the water inlet pipe, and the water outlet of the third condenser is connected to the water outlet pipe. The first heat exchanger, the surface cooler, the third condenser, the first dehumidifying wheel, the air booster, the first evaporator, the second dehumidifying wheel, the temperature-regulating heat exchanger, and the temperature-regulating heating device are sequentially arranged on the fresh air duct. The outlet of the fresh air duct is used to connect to the clean drying room. The water inlets of the surface cooler and the temperature-regulating heat exchanger are respectively connected to the water inlet pipe, and the water outlets of the surface cooler and the temperature-regulating heat exchanger are respectively connected to the water outlet pipe. The first condenser, the first compressor, the secondary regeneration heating device, the second condenser, the primary regeneration heating device, the second evaporator, and the regeneration fan are sequentially arranged on the regeneration duct along the regeneration direction. The first compressor, the first condenser, the first throttling device, and the first evaporator are connected end to end. One end of the cooling duct is connected to the fresh air duct and is located between the air booster and the first evaporator, and the other end is connected to the regeneration duct through the second dehumidifying wheel.

2. The energy-saving rotary dehumidification system as described in claim 1, characterized in that, The coupled heat pump unit further includes a first gas-liquid separator, and the deep dehumidification unit further includes a second gas-liquid separator. The first gas-liquid separator is disposed between the second evaporator and the second compressor, and the second gas-liquid separator is disposed between the third compressor and the third evaporator.

3. The energy-saving rotary dehumidification system as described in claim 1, characterized in that, A proportional regulating valve is installed at the water inlet of the surface cooler, the water inlet of the temperature regulating heat exchanger, and the water inlet of the third condenser.

4. The energy-saving rotary dehumidification system as described in claim 1, characterized in that, It also includes a fresh air valve, a fresh air exhaust valve, and a regeneration exhaust valve. The fresh air valve is located at the inlet of the fresh air duct, the fresh air exhaust valve is located at the outlet of the fresh air duct, and the regeneration exhaust valve is located at the outlet of the regeneration duct.

5. The energy-saving rotary dehumidification system as described in claim 4, characterized in that, A primary filter is provided between the fresh air valve and the first heat exchanger, and a medium-efficiency filter is provided between the temperature-regulating heat exchanger and the second dehumidifying wheel.

6. The energy-saving rotary dehumidification system as described in claim 1, characterized in that, It also includes a return air duct connected to the fresh air duct. The return air duct is located between the first dehumidifying wheel and the air pressurization device. The end of the return air duct away from the fresh air duct is used to connect to the clean drying room. A return air valve is provided on the return air duct.

7. A control method for an energy-saving rotary dehumidification system, characterized in that, The control method is used to implement the operation control of the energy-saving rotary dehumidification system as described in any one of claims 1-6, and the control method includes: Real-time acquisition of ambient fresh air dry-bulb temperature and ambient fresh air humidity; When the ambient fresh air dry-bulb temperature is >9℃ or the ambient fresh air moisture content is >6.8g / kg, the energy-saving rotary dehumidification system switches to summer operation mode, the coupled heat pump unit control switches to cooling mode, the deep dehumidification unit starts, and when water is detected in the inlet and outlet pipes and the air pressurization device is turned on, the third condenser and the fourth throttling device are turned on, and the third compressor is started. The fourth throttling device aims to control the temperature of the outlet side of the third evaporator, and ensures the minimum operating pressure difference between the evaporator side and the condenser side by controlling the condensation temperature of the third condenser. When the ambient fresh air dry-bulb temperature is ≤9℃ or the ambient fresh air humidity is ≤6.8g / kg, the energy-saving rotary dehumidification system switches to winter operation mode, the coupled heat pump unit control switches to heating mode, and the deep dehumidification unit does not operate.

8. The control method as described in claim 7, characterized in that, When the energy-saving rotary dehumidifier system switches to summer operation mode, the proportional regulating valve at the inlet of the third condenser opens to a preset opening of 10%, and the fourth throttling device opens to a preset opening of 30%.

9. The control method as described in claim 7, characterized in that, When the coupled heat pump unit is switched to cooling mode, the first heat exchanger enters evaporative cooling mode, the second evaporator stops operating, the second control valve and the second throttling device are closed, and the first control valve, the third throttling device and the second compressor are opened. The third throttling device performs PID adjustment according to the control target of the first preset temperature and the preset relative humidity value. The second compressor transfers the heat from the processing area to the second condenser and releases it to the regeneration side for regeneration heating. The first-stage regeneration heating device is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifier wheel. When the coupled heat pump unit is switched to heating mode, the surface cooler stops operating, the first control valve and the third throttling device are closed, and the second control valve, the second throttling device and the second compressor are opened. The second throttling device performs PID adjustment according to the control target of the second preset temperature. The first-stage regeneration heating device is used for regeneration temperature compensation and performs PID adjustment according to the outlet air humidity after the first dehumidifier wheel.

10. The control method as described in claim 7, characterized in that, The coupled heat pump unit is switched to heating mode, the surface cooler stops running, the first control valve and the third throttling device are closed, the second control valve, the second throttling device and the second compressor are opened, the second throttling device is opened to a preset opening degree of 10%, the second throttling device is adjusted by PID according to the control target of the second preset temperature, the first-stage regenerative heating device is used for regeneration temperature compensation, and is adjusted by PID according to the humidity of the air outlet after the first dehumidification wheel.

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