Central air conditioning cold and heat source machine room energy efficiency management system

Abstract

The application discloses a kind of central air conditioning cold and heat source machine room energy efficiency control management controller, including intelligent control module, with the heat sound power generation system and humidity control system of intelligent control module electricity connection, the hot air that cooling tower of central air conditioning is discharged after temperature rise by solar air heating machine, through the heater of heat sound power generation system, utilize hot air to make heat sound power generation system generate electricity, again through the regenerative duct of humidity control system, utilize hot air to make the desiccant of humidity control system regeneration, finally external discharge;The ventilation duct of humidity control system is communicated with the air duct of central air conditioning indoor unit, utilize the dry board in ventilation duct to reduce the humidity of air duct in air.This application uses high conversion efficiency generator, the low-grade heat energy that cooling tower is discharged after temperature rise makes the heater of heat sound power generation system generate electricity, solves the problem of low utilization rate of low-grade heat energy and the low conversion efficiency of existing power generation system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of central air conditioning control, and particularly relates to a central air conditioning cold and heat source machine room energy efficiency management system. BACKGROUND

[0002] In the operation and management of traditional central air conditioning cold and heat source machine rooms, relatively conventional equipment configuration and control methods are generally adopted. The main purpose is to realize refrigeration and heating cycles through basic equipment such as water chillers, cooling towers, and water pumps, to monitor parameters through simple temperature and pressure sensors, and to adjust equipment operation through manual setting or basic logic control methods. The current outdoor machine room air conditioning energy-saving system, energy-saving integrated base station machine room air conditioning unit, and heat pipe heat exchange energy-saving device for machine room air conditioning systems all use artificial setting logic programs to control the start-stop time and running power of basic equipment to achieve certain energy-saving effects. However, the basic equipment itself has not been improved or optimized, and it is difficult to further break through the energy-saving bottleneck. For example, the cooling tower cools the hot water by exchanging heat with cold air through the water chiller, and at the same time, the heat is discharged. In particular, in large office buildings, libraries, and other large buildings, the cooling tower has a large heat dissipation power, and a large amount of heat is discharged every day in summer, resulting in a large amount of wasted energy.

[0003] To solve the above-mentioned heat energy waste problem, there are two existing methods: one is to directly use the heat energy, such as heating the water in the heat preservation water storage tank to produce hot water for bathing, washing vegetables, and other domestic water use. The other is to indirectly use the heat energy by converting it into electricity, i.e., generating electricity using heat energy. The existing methods of generating electricity using hot air mainly include the following:

[0004] 1. Semiconductor thermoelectric generator, which has a low conversion efficiency (5-10%) and high material cost.

[0005] 2. Solar hot air flow power generation, which has a low conversion efficiency (1-2%) and requires a large area of glass / plastic greenhouse + central high chimney + turbine generator, which occupies a large area.

[0006] 3. Thermoacoustic generator, such as patent CN113037128A-thermoacoustic driven liquid friction generator and patent CN113037052B-multiphase thermoacoustic magnetic fluid generator, which use heat sources to heat the hot end to convert heat into electricity, with a high conversion efficiency (20-40%).

[0007] From the above three power generation methods, the thermoacoustic generator has the highest thermal energy conversion efficiency. Using a thermoacoustic generator for waste heat power generation in a cooling tower can improve the conversion efficiency. However, the cooling tower exhaust heat is usually at a temperature of 30-40°C, and in hot summer it is around 50°C, which is low-grade heat energy. Using low-grade heat energy for a thermoacoustic generator presents technical challenges, and it is difficult to balance power generation efficiency, waste heat utilization, and how to improve the utilization rate of low-grade heat energy. In addition, the above CN113037128A-thermoacoustic driven liquid friction generator and patent CN113037052B-multiphase thermoacoustic MHD generator have the following problems:

[0008] 1. The thermoacoustic driven liquid friction generator uses a single arc-shaped tube (equivalent to a resonant tube, also known as a thermal buffer tube). The piston movement frequency in the arc-shaped tube is proportional to the temperature gradient formed on the regenerator. The temperature gradient is determined by the heat absorbed by the heat absorption end of the arc-shaped tube (i.e., the more heat generated by the heater). The more heat, the greater the temperature difference, and the higher the piston frequency. However, under the same heating power, the heating power of a single heater is relatively low, and the piston frequency cannot be further improved, limiting the power generation efficiency.

[0009] 2. The multiphase thermoacoustic MHD generator uses a hexagonal thermal buffer tube, with one heater in each of the three sides of the tube, forming three thermoacoustic MHD power generation units. Although the three thermoacoustic MHD power generation units work simultaneously, the three heaters are separated and work independently, and the heat is not concentrated. The minimum temperature requirement for the power generation heat source has not been reduced, and the total power generation capacity is the sum of the three thermoacoustic MHD power generation units. The power generation efficiency of a single thermoacoustic MHD power generation unit has not been improved, and it cannot be applied to low-temperature heat sources. In addition, the hexagonal thermal buffer tube is large in volume, and its use is limited under conditions of limited installation space.

[0010] In addition to the above basic equipment problems, other basic equipment still has problems. For example, in the dehumidification mode of a central air conditioner, the fan of the indoor unit will run at a low speed, and the compressor will run at a high or low frequency according to the indoor humidity. At this time, the surface temperature of the evaporator is low, and when the humid air passes through the evaporator, the water vapor in the air will condense into low-temperature water droplets and adhere to the surface of the evaporator, and then be discharged to the outside through the drainage system. The following problems exist:

[0011] 1. In order to keep the temperature of the air flowing into the room consistent with the set temperature, the compressor is in operation. After the air passes through the evaporator to reduce humidity, the temperature decreases accordingly, and it needs to be heated to the set temperature before being discharged to the room. That is, in the dehumidification mode, the temperature is first lowered to dehumidify, and then raised, which is a two-step process. Obviously, there is a cold and hot offset problem in these two steps, and the energy consumption is higher than in the cooling mode.

[0012] 2. The low-temperature water liquefied on the surface of the evaporator is directly discharged, and the low-temperature water source is not utilized, causing energy waste.

[0013] 3. Compared to professional dehumidifiers, such as wheel dehumidifiers, which use dehumidifying wheels made of silica gel and molecular sieves to absorb moisture from the air, central air conditioning dehumidification systems have lower humidity control precision and cannot individually set target humidity (e.g., 30%-70%).

[0014] Therefore, the operation and management of existing central air conditioning cold and heat source rooms face technical challenges such as unreasonable cold and heat source management and unoptimized basic equipment. Summary of the Invention

[0015] To address the shortcomings of existing technologies, this invention provides an energy efficiency management system for a central air conditioning cold and heat source room, comprising an intelligent control module, a thermoacoustic power generation system electrically connected to the intelligent control module, and a humidity control system. Hot air discharged from the central air conditioning cooling tower is heated by a solar air heater, then passes through the heater of the thermoacoustic power generation system, using the hot air to generate electricity. The air then passes through the regeneration pipe of the humidity control system, using the hot air to regenerate the desiccant in the humidity control system, before passing through a heat storage tank and finally being discharged. Alternatively, the hot air discharged from the central air conditioning cooling tower passes through a heat storage tank filled with tap water and connected to the daily water supply pipeline before being discharged. The thermoacoustic power generation system includes a free-piston thermoacoustic engine and a linear generator. The free-piston thermoacoustic engine includes a resonant tube and a regenerator located inside the resonant tube. The heater and cooler are integrated with the resonant tube and located on opposite sides of the regenerator. The linear generator is connected to the free-piston thermoacoustic engine and generates electricity using the free-piston thermoacoustic engine. The heater includes components fixedly connected to... The resonant tube has multiple branch pipes on its sidewalls, all distributed circumferentially along the resonant tube. Each branch pipe has an inner liner, and both the branch pipe and the inner liner are connected to the resonant tube. Each branch pipe has an axially extending spiral heat exchange outer tube inside, and each inner liner has an axially extending spiral heat exchange inner tube embedded in its sidewall, such that part of the spiral heat exchange inner tube is located inside the inner liner, and another part is located between the inner liner and the branch pipe. The connection between all the spiral heat exchange outer and inner tubes forms... A heat exchange channel is provided, with its two ends connected to a solar air heater and a regeneration pipeline, respectively. The ventilation duct of the humidity control system is connected to the air duct of the central air conditioning indoor unit, and the drying plate in the ventilation duct reduces the humidity of the air in the air duct. The condensate of the central air conditioning indoor unit flows through the low-temperature water storage tank, the cooler of the thermoacoustic power generation system and the high-temperature water storage tank in sequence before being discharged. The low-temperature water storage tank and the high-temperature water storage tank are connected to the mixing water tank, which is connected to the air duct of the central air conditioning indoor unit through an atomizing pipe, and the atomizing pipe is located below the drying plate.

[0016] The preferred embodiment of the central air conditioning cold and heat source room energy efficiency management system of the present invention is as follows: The linear generator includes a power piston, a coil base, and a permanent magnet. The power piston is slidably connected inside a resonant tube, and the piston rod end of the power piston extends out of the resonant tube and is fixedly connected to the permanent magnet. The coil base is located outside the permanent magnet. The resonant tube is sealed with a working medium containing an inert gas such as helium, which has good thermophysical properties and acoustic characteristics. Under the action of the temperature difference between the heater and the cooler, the working medium generates self-excited acoustic oscillation, converting thermal energy into sound waves to drive the power piston to reciprocate mechanical energy. When the power piston drives the permanent magnet to move in the magnetic field, it changes the magnetic flux in the coil, inducing alternating current in the coil, thereby realizing the conversion of mechanical energy into electrical energy and outputting electrical energy for external use.

[0017] A preferred embodiment of the central air conditioning cold and heat source room energy efficiency management system of the present invention is as follows: The humidity control system includes a cylinder and a drive motor. The cylinder has a central cavity. The drying plate is disc-shaped and rotatably connected to the cavity, with its two sides slidingly sealed to the corresponding end faces of the cylinder. The drive motor is fixed to the outside of the cylinder and is connected to the drying plate via a transmission connection. The cylinder has four axially extending partitions inside, dividing the inner cavity into four fan-shaped channels. One channel is a ventilation duct, two channels are regeneration ducts, and one channel is a cooling channel. Pipe joints corresponding to each channel are located at both ends of the cylinder. Further, the drying plate has notches corresponding to the ventilation ducts. The output shaft of the drive motor has a gear, and a gear ring is fitted onto the outside of the drying plate, meshing with the gear. The drive motor drives the drying plate to rotate, causing the notches to alternately face the four channels. When the central air conditioning system is in dehumidification mode, the drive motor rotates the drying plate, misaligning the ventilation duct with the notch. Air flows through the drying plate, and the moisture in the air is absorbed by the desiccant, reducing humidity and achieving dehumidification. When the 1 / 4 of the drying plate facing the notch is saturated, the drive motor rotates the drying plate 45°, aligning the other 1 / 4 with the notch for continued dehumidification. The saturated 1 / 4 aligns with the regeneration duct and is regenerated by high-temperature air drying. The drive motor then rotates the drying plate 90°, aligning the regenerated 1 / 4 with the cooling channel. External air cools the regenerated 1 / 4, resolving the issue of increased air temperature in the duct caused by secondary dehumidification. The intelligent control module follows this pattern, continuously dehumidifying and regenerating the air in the duct.

[0018] The preferred embodiment of the central air conditioning cold and heat source room energy efficiency management system in this invention is as follows: the mixing water tank is equipped with an ultrasonic atomizing plate, and the atomizing pipe is equipped with a pressure-reducing fan. The pressure-reducing fan pumps the water mist generated by the ultrasonic atomizing plate into the air duct of the central air conditioning indoor unit.

[0019] A preferred embodiment of the central air conditioning cold and heat source room energy efficiency management system of this invention is as follows: the output end of the thermoacoustic power generation system is sequentially electrically connected to a power conversion circuit, a charging controller, a battery, and a power manager; each regeneration pipe is equipped with an electric heating wire, and the electric heating wire is electrically connected to the power manager. The AC power output from the thermoacoustic power generation system is converted into a stable DC power supply after passing through the power conversion circuit. The DC power supply stores electrical energy in the battery through the charging controller. The battery output is supplied to the electric heating wire through the power manager. The electric heating wire compensates for the slow regeneration speed caused by insufficient air temperature. The battery can also supply power to the pressure booster fan or other electrical components of the central air conditioning system, thereby achieving energy saving.

[0020] The beneficial effects of the central air conditioning cold and heat source room energy efficiency management system in this invention are as follows:

[0021] 1. A high-efficiency generator is used, and the low-grade heat energy discharged from the cooling tower is heated to generate electricity in the thermoacoustic power generation system, which solves the problems of low utilization rate of low-grade heat energy and low conversion efficiency of existing power generation systems.

[0022] 2. In cooling mode, the outdoor unit generates a large amount of heat, which is then transferred to the heat exchange channel after heating. This heats the working medium inside the resonant tube within the branch pipes and inner liner pipes. The heat carried by the spiral heat exchange outer and inner pipes in all branch pipes is released at the same location (i.e., the heated end) of the resonant tube, concentrating the heat at the heated end. Compared to existing resonant tubes and heaters, the contact area between the spiral heat exchange outer and inner pipes and the working medium is much larger than that of existing heaters. Although the air temperature inside the spiral heat exchange outer and inner pipes is relatively low, the large amount of heat concentrated at the same heated end results in a greater temperature rise at the heated end and a larger temperature gradient in the regenerator. This reduces the minimum temperature requirement for the power generation heat source and improves the utilization rate of low-temperature hot air. Furthermore, each branch pipe has multiple radially extending heat-conducting fins distributed circumferentially. One side of each heat-conducting fin extends into the inner liner pipe, and the corresponding spiral heat exchange outer and inner pipes penetrate all the heat-conducting fins. The first function of the heat-conducting fins is to fix the inner liner tube and the spiral heat exchanger inner tube inside the branch tube, serving as a connection. The second function is that the heat-conducting fins have a wavy cross-sectional shape, resulting in a large contact area between the fins and the working medium. Simultaneously, the heat-conducting fins are in direct contact with both the spiral heat exchanger outer tube and the spiral heat exchanger inner tube, significantly increasing the heat exchange area and further improving the heat transfer efficiency of the hot air.

[0023] 3. Compared to existing multiphase thermoacoustic magnetohydrodynamic generator structures that use multiple resonant tubes to increase total power generation, this invention increases the temperature of the heated end of a single resonant tube, thereby improving the power generation efficiency and output of that single resonant tube, which is beneficial for breaking through the upper limit of the power generation efficiency of thermoacoustic generators. Furthermore, a single resonant tube requires less installation space, making it particularly suitable for installations where there is insufficient space for central air conditioning outdoor units.

[0024] 4. The air passing through the heater still maintains a relatively high temperature, forming secondary high-temperature hot air. This secondary high-temperature hot air flows through the humidity control system, regenerating the desiccant and restoring its dehumidification capacity, thus enabling reuse. Compared to existing evaporator methods, this solves the problem of heat and cold offsetting, while also consuming significantly less energy than compressor dehumidification. Furthermore, the regenerable desiccant offers advantages such as high dehumidification control precision and minimal temperature influence.

[0025] 5. The condensate produced by the indoor unit of the central air conditioning system serves two purposes: First, it cools the cooler of the thermoacoustic power generation system, increasing the temperature difference between the working medium and the cooler, thereby improving power generation efficiency. Second, the condensate's temperature rises after passing through the cooler. The water stored in the low-temperature storage tank is at a lower temperature, while the water stored in the high-temperature storage tank is at a higher temperature. The high and low temperature waters are mixed as needed to obtain water at the set temperature. This water is then atomized and introduced into the air duct. The temperature of the water mist matches the set temperature, preventing water mist from mixing into the air duct and causing air temperature changes. The purpose of the water mist mixing with the air is to calibrate the humidity value of the air after dehumidification by the humidity control system, reducing the difference between the indoor air humidity and the set air humidity, further improving humidity control accuracy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the central air conditioning cold and heat source room energy efficiency management system of the present invention;

[0028] Figure 2 This is a schematic diagram of the thermoacoustic power generation system in this invention;

[0029] Figure 3 This is a schematic diagram of the resonant tube and heater in this invention;

[0030] Figure 4 for Figure 3 Internal structure diagram;

[0031] Figure 5 This is a schematic diagram of the humidity control system in this invention. Figure 1 ;

[0032] Figure 6 This is a schematic diagram of the humidity control system in this invention. Figure 2 ;

[0033] Figure 7 for Figure 6 A schematic diagram showing the hidden portion of the cylinder;

[0034] Figure 8 This is a schematic diagram of the thermal storage tank in this invention;

[0035] Figure 9 for Figure 8 A bottom view;

[0036] Figure 10 This is a schematic diagram of the internal structure of the branch pipe in the invention. Figure 1 ;

[0037] Figure 11 This is a schematic diagram of the internal structure of the branch pipe in the invention. Figure 2 .

[0038] Reference numerals in the attached drawings: 1. Resonant tube; 2. Regenerator; 3. Heater; 301. Branch tube; 302. Liner tube; 303. Spiral heat exchange outer tube; 304. Spiral heat exchange inner tube; 305. Heat-conducting fins; 4. Cooler; 5. Power piston; 6. Coil base; 7. Permanent magnet; 8. Drying plate; 9. Cylinder; 10. Drive motor; 11. Partition plate; 12. Pipe joint; 13. Ventilation duct; 14. Regeneration duct; 15. Cooling channel; 16. Notch; 17. Gear; 18. Gear ring; 19. Heat storage tank; 20. Heat exchange gas pipe; 21. Insulation cover. Detailed Implementation

[0039] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0040] like Figure 1 As shown, this embodiment provides an energy efficiency management system for a central air conditioning cold and heat source room, including an intelligent control module, a thermoacoustic power generation system and a humidity control system electrically connected to the intelligent control module. The intelligent control module is used to control all the electrical control parts of the thermoacoustic power generation system and the humidity control system, serving as the energy efficiency control and management center for the central air conditioning cold and heat source room.

[0041] This embodiment utilizes the cooling tower to exhaust hot air in the following way:

[0042] The cooling tower of the central air conditioning system is equipped with an air collector hood to collect the hot air blown out of the cooling tower. After being heated by a solar air heater, the hot air passes through the heater 3 of the thermoacoustic power generation system, where the hot air powers the thermoacoustic power generation system to generate electricity. Then, it passes through the regeneration pipe 14 of the humidity control system, where the hot air regenerates the desiccant in the humidity control system before finally being discharged. This system utilizes the hot air discharged from the cooling tower to generate electricity and regenerate the desiccant, thus balancing power generation efficiency and waste heat utilization.

[0043] The specific structure of the thermoacoustic power generation system is as follows:

[0044] like Figures 2 to 4 As shown, the thermoacoustic power generation system includes a free-piston thermoacoustic engine and a linear generator. To reduce the hot air transport path, the thermoacoustic power generation system is typically installed at the location of the outdoor unit, adjacent to it. The free-piston thermoacoustic engine includes a resonant tube 1 and a regenerator 2 located inside the resonant tube 1. The heater 3 and cooler 4 are integrated with the resonant tube 1, and the heater 3 and cooler 4 are located on both sides of the regenerator 2. The linear generator includes a power piston 5, a coil base 6, and a permanent magnet 7. The power piston 5 is slidably connected inside the resonant tube 1, and the piston rod end of the power piston 5 extends out of the resonant tube 1 and is fixedly connected to the permanent magnet 7. The coil base 6 is located outside the permanent magnet 7. The resonant tube 1 is sealed with a working medium of inert gas such as helium, which has good thermophysical properties and acoustic characteristics. The working medium generates self-excited acoustic oscillation under the temperature difference between heater 3 and cooler 4, converting thermal energy into sound waves to drive the reciprocating motion of the power piston 5. When the power piston 5 drives the permanent magnet 7 to move in the magnetic field, it changes the magnetic flux in the coil, inducing alternating current in the coil, thereby realizing the conversion of mechanical energy into electrical energy and outputting electrical energy for external use.

[0045] like Figure 10 and Figure 11As shown, the specific structure of the heater 3 in this embodiment is as follows: The heater 3 includes multiple branch pipes 301 fixedly connected to the side wall of the resonant tube 1, and all branch pipes 301 are distributed along the circumference of the resonant tube 1; all branch pipes 301 are provided with inner liner pipes 302 inside, and all branch pipes 301 and all inner liner pipes 302 are connected to the resonant tube 1; each branch pipe 301 is provided with a spiral heat exchange outer pipe 303 extending along the axial direction inside, and each inner liner pipe 302 is inlaid with a spiral heat exchange inner pipe 304 extending along the axial direction on the side wall, so that a part of the spiral heat exchange inner pipe 304 is located inside the inner liner pipe 302, and another part is located between the inner liner pipe 302 and the branch pipe 301. All of the spiral heat exchanger outer tubes 303 and half of the spiral heat exchanger inner tubes 304 are exposed in the space between the inner liner tube 302 and the branch tube 301, while the remaining half of the spiral heat exchanger inner tubes 304 are exposed in the space inside the inner liner tube 302. The purpose of this design is to maximize the heat exchange area after the spiral heat exchanger inner tubes 304 and spiral heat exchanger outer tubes 303 are fixed, avoid reducing the heat exchange area due to installation, and thus improve the heat exchange efficiency.

[0046] All the spiral heat exchanger outer tubes 303 and spiral heat exchanger inner tubes 304 are connected to form a heat exchange channel, and the two ends of the heat exchange channel are connected to the solar air heater and the regeneration pipe 14, respectively. In cooling mode, the outdoor unit generates a large amount of heat, which is then heated and transferred to the heat exchange channel. The working medium in the resonant tube 1 is heated in the branch pipes 301 and the inner liner pipe 302. All the branch pipes 301 heat the same position of the resonant tube 1, effectively transferring the energy of the hot air to the working medium. The heating efficiency is high, and this position forms the heating end. Compared with the existing heater 3, the contact area between the spiral heat exchanger outer tube 303 and spiral heat exchanger inner tube 304 and the working medium is much larger than the heating area of ​​the existing heater 3, further improving the heat transfer efficiency of the hot air. In addition, each branch pipe 301 is equipped with multiple radially extending heat-conducting fins 305 inside. All heat-conducting fins 305 are distributed circumferentially and are perpendicular to the branch pipe. One side of each heat-conducting fin 305 extends into the interior of the inner liner pipe 302, and the corresponding spiral heat exchange outer pipe 303 and spiral heat exchange inner pipe 304 penetrate all the heat-conducting fins 305. The function of the heat-conducting fins 305 is to fix the inner liner pipe 302 and the spiral heat exchange inner pipe 304 inside the branch pipe 301, thus serving a connecting function. Function 2: The cross-sectional shape of the heat-conducting fins 305 is wavy, resulting in a large contact area between the heat-conducting fins 305 and the working medium. Furthermore, the heat-conducting fins 305 are parallel to the airflow direction, so they do not affect the flow of hot and cold air within the branch pipe 301 and the inner liner pipe 302, thus preventing frequency reduction issues. At the same time, the heat-conducting fins 305 are in direct contact with the spiral heat exchange outer pipe 303 and the spiral heat exchange inner pipe 304, significantly increasing the heat exchange area and further improving the heat transfer efficiency of the hot air.

[0047] In this embodiment, the cooler 4 has the following structure: the cooler 4 is a heat-conducting pipe wound around the resonant tube 1, and the heat-conducting pipe is integrated with the resonant tube 1. The location of the cooler 4 forms the cold end. To utilize the condensate from the central air conditioning unit, the condensate from the central air conditioning unit in this embodiment flows sequentially through a low-temperature water storage tank, the cooler 4 of the thermoacoustic power generation system, and a high-temperature water storage tank before being discharged. Specifically, the water in the low-temperature water storage tank overflows and flows through the cooler 4, then enters the high-temperature water storage tank, and the water in the high-temperature water storage tank overflows before being discharged. The low-temperature cooling water significantly reduces the temperature of the cooler 4, increasing the temperature difference between the working medium and the heater 3 and the cooler 4, thereby improving power generation efficiency. To obtain a stable power supply, the output terminal of the thermoacoustic power generation system in this embodiment is sequentially connected to a power conversion circuit, a charging controller, a battery, and a power manager. The AC power output from the thermoacoustic power generation system is converted into a stable DC power supply after passing through the power conversion circuit. The DC power supply then stores electrical energy in the battery through the charging controller.

[0048] like Figures 5 to 7 As shown, to address the high energy consumption issue of existing central air conditioning systems' cooling and dehumidification modes, this embodiment includes a humidity control system. The ventilation duct 13 of the humidity control system is connected to the air duct of the central air conditioning unit, and the drying plate 8 inside the ventilation duct 13 reduces the humidity of the air in the air duct. The specific structure of the humidity control system is as follows: the humidity control system includes a cylinder 9 and a drive motor 10. The cylinder 9 has a cavity in the middle. The drying plate 8 is disc-shaped and rotatably connected to the cavity, with its two sides slidingly sealing against the corresponding end faces of the cylinder 9. The drive motor 10 is fixed to the outside of the cylinder 9 and is connected to the drying plate 8 via a transmission connection. The cylinder 9 has four axially extending partitions 11 inside, which divide the inner cavity of the cylinder 9 into four fan-shaped channels. One channel is a ventilation duct 13, two channels are regeneration pipes 14, and one channel is a cooling channel 15. The two ends of the cylinder 9 are respectively provided with pipe joints 12 corresponding to each channel. Furthermore, the drying plate 8 is provided with a notch 16 corresponding to the ventilation duct 13. When the ventilation duct 13 and the notch 16 are aligned, the dehumidification mode is not activated.

[0049] The output shaft of the drive motor 10 is equipped with a gear 17, and a gear ring 18 is fitted on the outer side of the drying plate 8, meshing with the gear 17. The drive motor 10 drives the drying plate 8 to rotate, causing the notch 16 to alternately face the four channels. If the central air conditioning is in dehumidification mode, the drive motor 10 drives the drying plate 8 to rotate, causing the ventilation duct 13 to be misaligned with the notch 16. Air in the duct flows through the drying plate 8, and the moisture in the air is adsorbed by the desiccant on the drying plate 8, thereby reducing the air humidity and achieving a dehumidification effect. When the 1 / 4 of the drying plate 8 facing the notch 16 is saturated, the drive motor 10 drives the drying plate 8 to rotate 45°, so that the other 1 / 4 of the drying plate 8 faces the notch 16, continuing dehumidification. The saturated 1 / 4 faces the regeneration duct 14, where it is regenerated and restored by high-temperature air drying. The drive motor 10 rotates the drying plate 8 by 90°, so that the regenerated 1 / 4 portion is directly opposite the cooling channel 15. The external air cools the regenerated 1 / 4 portion, solving the problem of increased air temperature in the duct caused by secondary dehumidification. The intelligent control module rotates the drive motor 10 according to this pattern, continuously dehumidifying the air in the duct while simultaneously regenerating it.

[0050] In this embodiment, the humidity control system is powered by a battery. Additionally, each regeneration pipe 14 is equipped with an electric heating wire, which is electrically connected to a power manager. The battery output supplies power to the heating wire through the power manager, compensating for the slow regeneration speed caused by insufficient air temperature. The battery can also power other electrical components of the central air conditioning system, thereby achieving energy savings. A temperature sensor, electrically connected to the intelligent control module, is installed within the regeneration pipe 14. When the air temperature inside the regeneration pipe 14 falls below the set regeneration temperature, the intelligent control module energizes the heating wire, thus forming a closed-loop temperature control system.

[0051] In this embodiment, the drying plate 8 has a porous structure and contains a regenerable desiccant. The desiccant can be silica gel, but is not limited to it. Compared to existing evaporators, the desiccant in the drying plate 8 offers advantages such as high dehumidification control accuracy and minimal temperature influence. To further improve humidity control accuracy, the low-temperature and high-temperature water storage tanks in this embodiment are connected to a mixing water tank. The mixing water tank is connected to the air duct of the central air conditioning unit via an atomizing pipe, which is located at the lower end of the drying plate 8. The mixing water tank is equipped with an ultrasonic atomizing plate, and a pressure-reducing fan is installed inside the atomizing pipe. The atomizing pipe has an air inlet, and the pressure-reducing fan pumps the water mist generated by the ultrasonic atomizing plate into the air duct of the central air conditioning unit. Both the low-temperature and high-temperature water storage tanks are equipped with water pumps electrically connected to the intelligent control module, and both the mixing water tank and the atomizing pipe are equipped with temperature probes electrically connected to the intelligent control module. For example, if the indoor temperature of the central air conditioning is set to 26℃, the intelligent control module controls the pumping ratio of the two water pumps based on the water temperature feedback from the temperature probe, so that the air temperature inside the atomizing tube is 26℃, thereby avoiding the problem of water mist mixing into the air duct and causing changes in air temperature.

[0052] The energy efficiency control and management method of the intelligent control module in this embodiment is as follows:

[0053] In summer, the central air conditioning system operates in cooling mode, generating electricity from the hot air blown out of the cooling tower. This electricity is stored in batteries, which power the energy-consuming components of the central air conditioning system, such as the indoor unit's fan, electric heating elements, and control panel. The conversion of heat energy into electrical energy is achieved through a smart control module that distributes the power as needed, reducing central air conditioning electricity costs. Simultaneously, the system utilizes exhaust air to prevent direct heat loss to the outside environment.

[0054] If the central air conditioning system is in dehumidification mode, the intelligent control module causes the drive motor 10 to rotate the drying plate 8, causing the ventilation duct 13 and the notch 16 to be misaligned. The angle of misalignment depends on the dehumidification requirements. This allows adjustment of the area directly opposite the drying plate 8 and the notch 16 to change the dehumidification capacity, providing on-demand dehumidification with high precision. A temperature and humidity sensor electrically connected to the intelligent control module is located at the lower source of the drying plate 8. When the detected humidity value is greater than the set value, the intelligent control module causes the drive motor 10 to continue rotating the drying plate 8, rotating the drying portion of the drying plate 8 to the notch 16, thus maintaining dehumidification capacity. The saturated drying portion rotates to the regeneration pipe 14, regaining its water absorption capacity after passing through two regeneration pipes 14. Finally, it passes through the cooling channel 15, which is connected to the outside atmosphere. Air is blown in by a blower to lower the temperature of the drying plate 8 during the regeneration process. The electric heating wire in the regeneration pipe 14 is controlled by the intelligent control module to increase the regeneration speed. Although the central air conditioner compressor continues to work in dehumidification mode, the evaporator dehumidifies while the drying plate 8 dehumidifies simultaneously, which greatly speeds up the dehumidification process, thereby reducing the compressor's operating time and power consumption.

[0055] The aforementioned energy efficiency management method involves heating the low-grade hot air exhausted from the cooling tower using a solar air heater to meet the power generation requirements of the thermoacoustic power generation system. Without this solar air heater, the low-grade hot air cannot be utilized. Therefore, this energy efficiency management method relies on the heating step of the solar air heater and can only be implemented during the day. However, in reality, some office buildings and libraries still require central air conditioning to operate continuously at night during the summer, while the heating effect of the solar air heater is almost zero at night. To utilize the low-grade hot air even in nighttime mode, this embodiment achieves this through the following solution:

[0056] like Figure 8 and Figure 9 As shown, the system includes a thermal storage tank 19, which is connected to a tap water pipe and kept full by a float level gauge. Heat exchange air pipes 20 are distributed inside the thermal storage tank 19. An air collector hood is installed at the air outlet of the central air conditioning cooling tower. The air collector hood is connected to one end of the heat exchange air pipe 20 and the solar air heater via a reversing valve. The reversing valve controls the flow direction of the low-grade hot air, and the other end of the heat exchange air pipe 20 is discharged externally. When the sun sets, the power generation of the thermoacoustic power generation system significantly decreases, and the reversing valve switches the low-grade hot air to the heat exchange air pipe 20. Since the temperature of the tap water is lower than that of the low-grade hot air, heat exchange occurs between the low-grade hot air and the water in the thermal storage tank 19, causing the water temperature to rise and fully utilizing the low-grade thermal energy. The thermal storage tank 19 is connected to the daily hot water pipelines in nearby buildings such as office buildings and libraries. When the water temperature in the thermal storage tank 19 reaches the set water temperature, the solenoid valve between the thermal storage tank 19 and the daily hot water pipeline opens to meet the daily hot water demand, thereby making full use of low-grade heat sources and reducing the frequency of use of natural gas water heaters or electric water heaters, thus saving energy and reducing emissions.

[0057] In summer, the temperature of hot water used daily is generally 35-42℃. However, water has a high specific heat capacity, and the heat discharged from the cooling tower at night may not be enough to heat the water in the thermal storage tank 19 to a usable temperature. Therefore, in this embodiment, the thermal storage tank 19 is equipped with an openable insulation cover 21. During the day, the insulation cover 21 is opened, exposing the thermal storage tank 19 and utilizing sunlight to raise the water temperature. Additionally, one end of the heat exchange pipe 20 is connected to a humidity control system. During the day, the air collector hood is connected to a solar air heater via a reversing valve. Second-high temperature hot air passes through the humidity control system and then is discharged through the heat exchange pipe 20, utilizing the residual heat of the second-high temperature hot air to further increase the water temperature in the thermal storage tank 19. At night, the insulation cover 21 is closed, sealing the thermal storage tank 19 and preventing water temperature loss during the night.

[0058] However, in actual use, the volume of the thermal storage tank 19 may be large, and it may take several days to raise the water temperature to above 35°C. As a backup hot water tank, the main function of the thermal storage tank 19 is to absorb low-grade heat sources and prevent this part of the heat source from being directly discharged and wasted. As the heat in the thermal storage tank 19 continues to accumulate until the water temperature reaches above 35°C, the solenoid valve between the thermal storage tank 19 and the daily hot water pipeline opens. When the water level drops to the set level, the float level gauge opens the tap water pipe to automatically replenish water.

[0059] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A central air conditioning cold and heat source room energy efficiency management system, characterized in that: This includes an intelligent control module, a thermoacoustic power generation system electrically connected to the intelligent control module, and a humidity control system; The hot air discharged from the cooling tower of the central air conditioning system is heated by the solar air heater after passing through the reversing valve. Then it passes through the heater of the thermoacoustic power generation system, which uses hot air to generate electricity. After passing through the regeneration pipe of the humidity control system, the desiccant of the humidity control system is regenerated by hot air. After passing through the heat storage tank, it is finally discharged. The hot air discharged from the cooling tower of the central air conditioning system enters from one end of the heat exchange pipe inside the heat storage tank through the reversing valve, and is discharged after passing through the heat exchange pipe. The thermal storage tank is filled with tap water and is connected to the daily water supply pipeline. The thermoacoustic power generation system includes a free-piston thermoacoustic engine and a linear generator. The free-piston thermoacoustic engine includes a resonant tube and a regenerator located inside the resonant tube. The heater and cooler are integrated with the resonant tube and are located on both sides of the regenerator. The linear generator is connected to the free-piston thermoacoustic engine and generates electricity using the free-piston thermoacoustic engine. The heater includes multiple branch pipes fixedly connected to the side wall of the resonant tube, and all branch pipes are distributed along the circumference of the resonant tube. Each branch pipe has an inner liner pipe inside, and all branch pipes and all inner liner pipes are connected to the resonant tube. Each branch pipe has an axially extending spiral heat exchange outer tube inside, and each inner liner pipe has an axially extending spiral heat exchange inner tube embedded in its side wall, such that part of the spiral heat exchange inner tube is located inside the inner liner pipe, and another part is located between the inner liner pipe and the branch pipe. All spiral heat exchange outer tubes and spiral heat exchange inner tubes are connected to form a heat exchange channel, and the two ends of the heat exchange channel are respectively connected to a solar air heater and a regeneration pipeline. The humidity control system's ventilation duct is connected to the air duct of the central air conditioning unit, and the drying plate inside the ventilation duct reduces the humidity of the air in the air duct. The condensate from the indoor unit of the central air conditioner flows sequentially through the low-temperature water storage tank, the cooler of the thermoacoustic power generation system, and the high-temperature water storage tank before being discharged. The low-temperature water storage tank and the high-temperature water storage tank are respectively connected to the mixing water tank. The mixing water tank is connected to the air duct of the indoor unit of the central air conditioner through an atomizing pipe, and the atomizing pipe is located below the drying plate.

2. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 1, characterized in that: The linear generator includes a power piston, a coil base, and a permanent magnet. The power piston is slidably connected inside the resonant tube, and the piston rod of the power piston extends out of the resonant tube and is fixedly connected to the permanent magnet. The coil base is located outside the permanent magnet.

3. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 2, characterized in that: Each branch pipe has multiple heat-conducting fins extending radially inside. All heat-conducting fins are distributed circumferentially and are perpendicular to the branch pipe. One side of each heat-conducting fin extends into the interior of the inner liner pipe, and the corresponding spiral heat exchange outer tube and spiral heat exchange inner tube penetrate all the heat-conducting fins.

4. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 3, characterized in that: The humidity control system includes a cylinder and a drive motor. The cylinder has a cavity in the middle. The drying plate is disc-shaped and is rotatably connected to the cavity. The two sides of the drying plate are slidably sealed to the end faces of the cylinder. The drive motor is fixed to the outside of the cylinder and is connected to the drying plate in a transmission manner. The cylinder has four axially extending baffles inside, which divide the inner cavity of the cylinder into four fan-shaped channels. One channel is a ventilation duct, two channels are regeneration ducts, and one channel is a cooling channel. The two ends of the cylinder are respectively provided with pipe joints corresponding to each channel.

5. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 4, characterized in that: The drying plate has a notch corresponding to the ventilation duct; the output shaft of the drive motor is equipped with a gear, and a gear ring is fitted on the outer side of the drying plate, and the gear ring meshes with the gear. The drive motor drives the drying plate to rotate, so that the notch is alternately opposite to the four channels.

6. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 5, characterized in that: The mixing water tank is equipped with an ultrasonic atomizing plate, and the atomizing tube is equipped with a pressure-reducing fan. The pressure-reducing fan pumps the water mist generated by the ultrasonic atomizing plate into the air duct of the central air conditioning indoor unit.

7. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 6, characterized in that: The output of the thermoacoustic power generation system is sequentially connected to a power conversion circuit, a charging controller, a battery, and a power manager; each regeneration pipe is equipped with an electric heating wire, and the electric heating wire is electrically connected to the power manager.

8. The energy efficiency management system for a central air conditioning cold and heat source room according to claim 1, characterized in that: The heat storage tank has heat exchange pipes distributed inside, one end of which is connected to the humidity control system, and the other end is discharged externally; the heat storage tank is equipped with an openable heat preservation cover.

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