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

Abstract

The invention discloses a central air conditioner cold and heat source machine room energy efficiency control management controller which comprises an intelligent control module, a thermo-acoustic power generation system and a humidity control system, the thermo-acoustic power generation system and the humidity control system are electrically connected with the intelligent control module, and hot air exhausted by a cooling tower of a central air conditioner passes through a heater of the thermo-acoustic power generation system after being heated by a solar air heater. Hot air is utilized to enable the thermo-acoustic power generation system to generate power, then through a regeneration pipeline of the humidity control system, the hot air is utilized to regenerate a drying agent of the humidity control system, and finally the drying agent is discharged; a ventilation pipeline of the humidity control system communicates with an air duct of the central air conditioner indoor unit, and the humidity of air in the air duct is reduced through a drying plate in the ventilation pipeline. By adopting the generator with high conversion efficiency and the heater for enabling the thermo-acoustic power generation system to generate power after the low-grade heat energy discharged by the cooling tower is heated, the problems of low utilization rate of the low-grade heat energy and low conversion efficiency of the existing power generation system are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of central air-conditioning control, and specifically relates to an energy efficiency control and management controller for a central air-conditioning cold and heat source machine room. Background Art

[0002] In the operation and management of traditional central air-conditioning cold and heat source machine rooms, relatively conventional equipment configurations and control methods are generally adopted. It mainly relies on basic equipment such as chillers, cooling towers, and water pumps to achieve the refrigeration and heating cycles, monitors parameters through simple temperature, pressure, etc. sensors, and adjusts the equipment operation by manual setting or basic logic control methods. Currently, for outdoor machine room air-conditioning energy-saving systems, energy-saving integrated base station machine room air-conditioning units, and heat pipe heat exchange energy-saving devices for machine room air-conditioning systems, their energy-saving methods all achieve a certain energy-saving effect by manually setting logical programs to control the start-stop time, operating power, etc. of the basic equipment, while the basic equipment itself has not been improved or optimized, and it is impossible to further break through the energy-saving bottleneck. For example, a cooling tower exchanges heat between hot water and cold air through a chiller to cool the hot water and discharge heat at the same time. Especially in large office buildings, libraries, etc., the cooling tower of such large buildings has a large heat dissipation power, and a large amount of heat energy is discharged outdoors every day in summer, and a large amount of heat is not utilized, resulting in energy waste.

[0003] In response to the above heat energy waste problem, the existing treatment methods are divided into two types. One is to directly utilize the heat energy, such as heating the water body in a heat preservation water storage tank to generate hot water for domestic use such as bathing and washing vegetables. The other is indirect utilization, converting heat energy into electrical energy, that is, using heat energy to generate electricity. The existing methods for generating electricity using hot air mainly include the following: 1. Semiconductor thermoelectric generator chips, whose conversion efficiency is relatively low (5 - 10%), and at the same time, the material cost is high.

[0004] 2. Solar chimney power generation, whose conversion efficiency is low (1 - 2%), and requires a large area of glass / plastic greenhouse + central high chimney + turbine generator, and the equipment occupies a large area.

[0005] 3. Thermoacoustic generators, such as: Patent CN113037128A - Thermoacoustic-driven liquid friction generator, Patent CN113037052B - Multiphase thermoacoustic magnetohydrodynamic generator, which both use a heat source to heat the hot end to convert heat energy into electrical energy, and the conversion efficiency is relatively high (20 - 40%).

[0006] As can be seen 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 temperature of the heat discharged from the cooling tower is usually between 30°C and 40°C, and about 50°C in hot summer, which belongs to low-grade thermal energy. There are technical difficulties in using low-grade thermal energy for a thermoacoustic generator, and it is impossible to balance power generation efficiency, waste heat utilization, and how to improve the utilization rate of low-grade thermal energy. In addition, the above-mentioned CN113037128A - Thermoacoustic-Driven Liquid Friction Generator and Patent CN113037052B - Multiphase Thermoacoustic Magnetohydrodynamic Generator have the following problems: 1. The thermoacoustic-driven liquid friction generator uses a single curved tube (equivalent to a resonator tube, also called a thermal buffer tube). The movement frequency of the piston in the curved tube is proportional to the temperature gradient formed on the regenerator. The temperature gradient is determined by the heat absorbed at the heat absorption end of the curved tube (i.e., the more heat the heater generates). The more heat, the greater the temperature difference, and the higher the piston movement frequency. However, under the same heating power, the heating power of a single heater is relatively low, and the piston frequency cannot be further increased, resulting in limited power generation efficiency.

[0007] 2. The multiphase thermoacoustic magnetohydrodynamic generator uses a hexagonal thermal buffer tube, and heaters are respectively arranged in the pipes on three sides, thus forming three thermoacoustic magnetohydrodynamic power generation units. Although the three thermoacoustic magnetohydrodynamic power generation units work simultaneously, the three heaters are separated and work independently, and their heat is not concentrated. The minimum temperature requirement for the power generation heat source is not reduced. The total power generation amount is the sum of the three thermoacoustic magnetohydrodynamic power generation units, and the power generation efficiency of a single thermoacoustic magnetohydrodynamic power generation unit is not improved, so it is not applicable to heat sources with lower temperatures. In addition, the hexagonal thermal buffer tube has a large volume and is limited in use under conditions with limited installation space.

[0008] In addition to the above basic equipment problems, there are still problems with other basic equipment. For example, in the dehumidification mode of a central air conditioner, the indoor fan will operate at a lower speed, while the compressor will operate at a high or low frequency according to the indoor humidity. At this time, the surface temperature of the evaporator is relatively low. When 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 outdoors through the drainage system. The following problems exist: 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, its temperature decreases accordingly. It needs to be heated up to the set temperature again and finally discharged into the room. That is, in the dehumidification mode, it first cools and dehumidifies, and then heats up, in two steps. Obviously, there is a problem of cold and heat cancellation in these two steps, and the energy consumption is higher than that in the refrigeration mode.

[0009] 2. The low-temperature water liquefied on the surface of the evaporator is directly discharged outdoors, and the low-temperature water source is not utilized, resulting in energy waste.

[0010] 3. Compared with professional dehumidifiers, such as rotary dehumidifiers, which use dehumidification rotors made of silica gel and molecular sieves to absorb moisture in the air, have strong moisture absorption ability, high precision, and the dehumidification rotors can be regenerated and reused. The humidity control precision of the central air-conditioning dehumidification system is relatively low, and the target humidity (such as 30%-70%) cannot be set independently.

[0011] Therefore, there are technical problems in the operation and management of existing central air-conditioning cold and heat source machine rooms, such as unreasonable cold and heat source management and unoptimized basic equipment. Summary of the Invention

[0012] In view of the deficiencies of the prior art, the present invention provides an energy efficiency control and management controller for a central air-conditioning cold and heat source machine room, which includes an intelligent control module, a thermoacoustic power generation system and a humidity control system electrically connected to the intelligent control module; the hot air discharged from the cooling tower of the central air-conditioning is heated by a solar air heater and then passes through the heater of the thermoacoustic power generation system. The hot air is used to generate electricity in the thermoacoustic power generation system, and then passes through the regeneration pipeline of the humidity control system. The hot air is used to regenerate the desiccant of the humidity control system, and then passes through the heat storage pool and is finally discharged; or the hot air discharged from the cooling tower of the central air-conditioning is discharged after passing through the heat storage pool. The heat storage pool is filled with tap water and is connected to the daily water pipeline; the thermoacoustic power generation system includes a free-piston thermoacoustic engine and a linear generator; the free-piston thermoacoustic engine includes a resonance tube and a regenerator located inside the resonance tube. The heater and the cooler are integrated with the resonance tube, and the heater and the cooler are located on both sides of the regenerator; the linear generator is connected to the free-piston thermoacoustic engine to generate electricity using the free-piston thermoacoustic engine; the heater includes a plurality of branch pipes fixedly connected to the side wall of the resonance tube, and all the branch pipes are distributed along the circumferential direction of the resonance tube; the inner liners are provided inside all the branch pipes, and all the branch pipes and all the inner liners are connected to the resonance tube; a spiral heat exchange outer tube extending along the axial direction is provided inside each branch pipe, and a spiral heat exchange inner tube extending along the axial direction is inlaid on the side wall of each inner liner, so that a part of the spiral heat exchange inner tube is located inside the inner liner, and the other part is located between the inner liner and the branch pipe; after all the spiral heat exchange outer tubes and the spiral heat exchange inner tubes are connected, a heat exchange channel is formed, and both ends of the heat exchange channel are respectively connected to the solar air heater and the regeneration pipeline; the ventilation pipeline of the humidity control system is connected to the air duct of the central air-conditioning indoor unit, and the dry plate in the ventilation pipeline is used to reduce the humidity of the air in the air duct; the condensate water 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 and then is discharged. The low-temperature water storage tank and the high-temperature water storage tank are respectively connected to the temperature mixing water tank, and the temperature mixing water tank 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 dry plate.

[0013] The preferred scheme of the energy efficiency control management controller of the central air conditioning cold and heat source room in the present invention is: the linear generator includes a power piston, a coil base and a permanent magnet, the power piston is slidably connected in the resonance tube, and the end of the piston rod of the power piston extends out of the resonance tube and is fixedly connected to the permanent magnet, and the coil base is located outside the permanent magnet. The resonance tube is sealed with a working medium of inert gas such as helium, which has good thermophysical properties and acoustic properties. Under the action of the temperature difference between the heater and the cooler, the working medium generates self-excited acoustic oscillation, converts thermal energy into sound waves to drive the mechanical energy of the reciprocating motion of the power piston. When the power piston drives the permanent magnet to move in the magnetic field, it will change the magnetic flux in the coil, and will induce alternating current in the coil, thereby realizing the conversion of mechanical energy to electrical energy, and outputting electrical energy for external use.

[0014] The preferred scheme of the energy efficiency control management controller for the central air conditioning cold and hot source room in the present invention is as follows: the humidity control system includes a cylinder and a driving motor, a vacancy is provided in the middle of the cylinder, the drying plate is in the shape of a disc, the drying plate is rotatably connected to the vacancy and the two sides of the drying plate are slidably sealed with the end faces corresponding to the cylinder; the driving motor is fixed to the outside of the cylinder, and the driving motor is connected to the drying plate in a transmission manner; the cylinder is provided with four axially extending partitions, and the inner cavity of the cylinder is divided by the partitions to form four fan-shaped channels in cross section, one of which is a ventilation duct, two of which are regeneration ducts, and one of which is a cooling channel; the two ends of the cylinder are respectively provided with pipe joints corresponding to each channel. Further, the drying plate is provided with a notch corresponding to the ventilation duct; the output shaft of the driving motor is provided with a gear, and the outer side of the drying plate is provided with a gear ring, and the gear ring is meshed with the gear, and the drying plate is driven to rotate by the driving motor, so that the notch is opposite to the four channels in turn. If the central air conditioner is turned on the dehumidification mode, the drive motor drives the drying plate to rotate, so that the ventilation duct and the gap are misaligned, and the air in the air duct flows through the drying plate. The moisture in the air is adsorbed by the desiccant of the drying plate, thereby reducing the air humidity and achieving the dehumidification effect. When the 1 / 4 drying plate facing the gap is saturated, the drive motor drives the drying plate to rotate 45°, so that the other 1 / 4 of the drying plate faces the gap and continues to dehumidify. The saturated 1 / 4 part faces the regeneration duct and is regenerated and restored by high-temperature air drying. The drive motor drives the drying plate to rotate 90°, and the regenerated 1 / 4 part faces the cooling channel. The external air cools the regenerated 1 / 4 part, solving the problem of increased air temperature in the air duct caused by secondary dehumidification. The intelligent control module rotates the drive motor according to this rule, continuously dehumidifies the air in the air duct, and continuously regenerates at the same time.

[0015] The preferred solution of the energy efficiency control and management controller for the central air-conditioning cold and heat source machine room in the present invention is as follows: The mixing water tank is provided with an ultrasonic atomization sheet, and a pressure compensating fan is arranged in the atomization pipe. The water mist generated by the ultrasonic atomization sheet is pumped into the air duct of the central air-conditioning indoor unit through the pressure compensating fan.

[0016] The preferred solution of the energy efficiency control and management controller for the central air-conditioning cold and heat source machine room in the present invention is as follows: The output end of the thermoacoustic power generation system is electrically connected to a power conversion circuit, a charging controller, a battery, and a power manager in sequence; an electric heating wire is arranged in each regeneration pipeline, and the electric heating wire is electrically connected to the power manager. The alternating current output by the thermoacoustic power generation system forms a stable direct current power supply after passing through the power conversion circuit. The direct current power supply stores electrical energy in the battery through the charging controller. The output of the battery is supplied to the electric heating wire through the power manager, and the electric heating wire makes up for the insufficient regeneration speed caused by the insufficient air temperature. The battery can also supply power to the pressure compensating fan or other power-consuming parts of the central air-conditioning, so as to achieve the purpose of energy conservation.

[0017] The beneficial effects of the energy efficiency control and management controller for the central air-conditioning cold and heat source machine room in the present invention are as follows: 1. By using a generator with high conversion efficiency, the heater of the thermoacoustic power generation system is heated by the low-grade heat energy discharged from the cooling tower after temperature rise, which solves the problems of low utilization rate of low-grade heat energy and low conversion efficiency of the existing power generation system.

[0018] 2. In the refrigeration mode, a large amount of heat generated by the outdoor unit is sent to the heat exchange channel after temperature rise, and the working medium in the resonance tube is heated in the branch pipe and the inner lining pipe. The heat carried by the spiral heat exchange outer pipe and the spiral heat exchange inner pipe in all branch pipes is released at the same position (i.e., the heated end) of the resonance tube, and the heat is concentrated at the heated end of the resonance tube. Compared with the existing resonance tube and heater, the contact area between the spiral heat exchange outer pipe and the spiral heat exchange inner pipe and the working medium is much larger than the heating area of the existing heater. Although the air temperature in the spiral heat exchange outer pipe and the spiral heat exchange inner pipe is relatively low, a large amount of heat is concentrated at the heated end of the same position, resulting in a greater temperature rise at the heated end and a greater temperature gradient of the regenerator, thereby reducing the minimum temperature requirement of the power generation heat source and improving the utilization rate of low-temperature hot air. In addition, a plurality of heat conducting fins extending along the radial direction are arranged inside each branch pipe, and all the heat conducting fins are distributed circumferentially; one side of each heat conducting fin extends into the inside of the inner lining pipe, and the corresponding spiral heat exchange outer pipe and spiral heat exchange inner pipe penetrate through all the heat conducting fins. The functions of the heat conducting fins are as follows: Function 1: Fix the inner lining pipe and the spiral heat exchange inner pipe inside the branch pipe and play a connecting role. Function 2: The cross-sectional shape of the heat conducting fin is wavy, the contact area between the heat conducting fin and the working medium is large, and the heat conducting fin is in direct contact with the spiral heat exchange outer pipe and the spiral heat exchange inner pipe, so the heat conducting fin greatly increases the heat exchange area and further improves the heat transfer efficiency of the hot air.

[0019] 3. Compared with the existing multi-phase thermoacoustic magnetohydrodynamic generator structure that uses multiple resonance tubes to increase the total power generation, the present invention increases the temperature of the heated end of a single resonance tube, thereby improving the power generation efficiency and power generation amount of the single resonance tube, which is conducive to breaking through the upper limit of the power generation efficiency of the thermoacoustic generator. In addition, a single resonance tube has low requirements for installation space and is particularly suitable for installation situations where the installation space for the outdoor unit of a central air conditioner is insufficient.

[0020] 4. The air passing through the heater still has a relatively high temperature, forming secondary high-temperature hot air. By using the secondary high-temperature hot air to flow through the humidity control system, the desiccant in the humidity control system is regenerated and restored to its original state, recovering its dehumidification ability, so as to achieve repeated use. Compared with the existing evaporator method, the problem of cold and heat offset is solved, and the dehumidification energy consumption is much lower than that of compressor dehumidification. In addition, the renewable desiccant has the advantages of high dehumidification control accuracy and small temperature influence.

[0021] 5. The condensate generated by the indoor unit of the central air conditioner has two functions. One is to cool the cooler of the thermoacoustic power generation system, increasing the temperature difference between the working medium in the heater and the cooler, and improving the power generation efficiency. The other is that after the condensate passes through the cooler, its temperature rises. The water stored in the low-temperature water storage tank has a low temperature, and the water stored in the high-temperature water storage tank has a high temperature. The high- and low-temperature water is mixed according to requirements to obtain water with a set water temperature. After this water is atomized and introduced into the air duct, the temperature of the water mist is consistent with the set temperature, which can avoid the problem of air temperature change caused by the water mist mixing into the air duct. The function of the water mist mixed with the air is to calibrate the air humidity value after dehumidification by the humidity control system, reducing the difference between the indoor air humidity and the set air humidity, and further improving the humidity control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is the schematic diagram of the energy efficiency control and management controller of the cold and heat source machine room of the central air conditioner of the present invention; Figure 2 is the schematic structural diagram of the thermoacoustic power generation system of the present invention; Figure 3 is the schematic structural diagram of the resonance tube and the heater of the present invention; Figure 4 is Figure 3 the internal structural schematic diagram; Figure 5 is the schematic structure of the humidity control system of the present invention Figure 1; Figure 6 Schematic structure of the humidity control system in the present invention Figure 2 ; Figure 7 is Figure 6 Schematic diagram after hiding part of the cylinder in Figure 8 Schematic structure diagram of the heat storage pool in the present invention Figure 9 is Figure 8 bottom view of Figure 10 Schematic internal structure of the branch pipe in the invention Figure 1 ; Figure 11 Schematic internal structure of the branch pipe in the invention Figure 2 .

[0024] Reference numerals: resonance tube 1, regenerator 2, heater 3, branch pipe 301, inner lining pipe 302, spiral heat exchange outer pipe 303, spiral heat exchange inner pipe 304, heat conduction fin 305, cooler 4, power piston 5, coil base 6, permanent magnet 7, drying plate 8, cylinder 9, drive motor 10, partition plate 11, pipe joint 12, ventilation duct 13, regeneration duct 14, cooling channel 15, notch 16, gear 17, gear ring 18, heat storage pool 19, heat exchange air pipe 20, heat preservation cover 21. Detailed implementation manners

[0025] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention through long-term research and a large number of practices. The following will further explain the technical solution, its implementation process and principle, etc. in combination with the drawings in the embodiments of the present application and specific implementation cases.

[0026] As Figure 1 shown, this embodiment provides an energy efficiency control and management controller for a central air-conditioning cold and heat source machine 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 electrically controlled parts in the thermoacoustic power generation system and the humidity control system, and serves as the energy efficiency control and management center of the central air-conditioning cold and heat source machine room.

[0027] The method of using the hot air discharged from the cooling tower in this embodiment is as follows: A wind collecting cover is provided at the air outlet of the cooling tower of the central air-conditioning to collect the hot air blown out by the cooling tower. After the hot air is heated by the solar air heater, it passes through the heater 3 of the thermoacoustic power generation system, and the thermoacoustic power generation system is used to generate electricity by using the hot air. Then it passes through the regeneration duct 14 of the humidity control system, and the desiccant of the humidity control system is regenerated by using the hot air, and finally it is discharged to the outside. That is, the hot air discharged from the cooling tower is used for power generation and desiccant regeneration, taking into account both power generation efficiency and waste heat utilization.

[0028] Among them, the specific structure of the thermoacoustic power generation system is as follows: As Figures 2 to 4 shown, the thermoacoustic power generation system includes a free-piston thermoacoustic engine and a linear generator. In order to reduce the hot air delivery path, the thermoacoustic power generation system is usually installed at the location where the outdoor unit is located and adjacent to the outdoor unit. The free-piston thermoacoustic engine includes a resonance tube 1 and a regenerator 2 located inside the resonance tube 1. The heater 3 and the cooler 4 are integrated with the resonance tube 1, and the heater 3 and the 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 resonance tube 1, and the end of the piston rod of the power piston 5 extends out of the resonance tube 1 and is fixedly connected to the permanent magnet 7. The coil base 6 is located outside the permanent magnet 7. The resonance tube 1 is filled with a working medium such as helium and other inert gases, which has good thermophysical properties and acoustic characteristics. Under the action of the temperature difference between the heater 3 and the cooler 4, the working medium generates self-excited acoustic oscillations, 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, the magnetic flux in the coil will change, and an alternating current will be induced in the coil, thereby realizing the conversion of mechanical energy into electrical energy and outputting electrical energy for external use.

[0029] As Figure 10 and Figure 11 shown, in this embodiment, the specific structure of the heater 3 is: The heater 3 includes a plurality of branch pipes 301 fixedly connected to the side wall of the resonance tube 1, and all the branch pipes 301 are distributed along the circumferential direction of the resonance tube 1; a lining tube 302 is provided inside all the branch pipes 301, and all the branch pipes 301 and all the lining tubes 302 are communicated with the resonance tube 1; a spiral heat exchange outer tube 303 extending along the axial direction is provided inside each branch pipe 301, and a spiral heat exchange inner tube 304 extending along the axial direction is embedded in the side wall of each lining tube 302, so that a part of the spiral heat exchange inner tube 304 is located inside the lining tube 302, and the other part is located between the lining tube 302 and the branch pipe 301. All the spiral heat exchange outer tubes 303 and half of the spiral heat exchange inner tubes 304 are exposed in the space between the lining tube 302 and the branch pipe 301, and the remaining half of the spiral heat exchange inner tubes 304 are exposed in the space inside the lining tube 302. The purpose of this design is that after the spiral heat exchange inner tube 304 and the spiral heat exchange outer tube 303 are fixed, their heat exchange area is maximized, avoiding the reduction of the heat exchange area due to installation, thereby improving the heat exchange efficiency.

[0030] All the spiral heat exchange outer tubes 303 and the spiral heat exchange inner tubes 304 are connected to form a heat exchange channel, and both ends of the heat exchange channel are respectively connected to the solar air heater and the regeneration pipeline 14. In the refrigeration mode, a large amount of heat generated by the external machine is transported to the heat exchange channel after being heated, and the working medium in the resonance tube 1 is heated in the branch tube 301 and the inner liner tube 302. All the branch tubes 301 jointly heat the same position of the resonance tube 1, effectively transferring the energy of the hot air to the working medium with high heating efficiency, and a heating end is formed at this position. Compared with the existing heater 3, the contact area between the spiral heat exchange outer tube 303 and the spiral heat exchange 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, multiple heat conduction fins 305 extending radially are provided inside each branch tube 301, all the heat conduction fins 305 are circumferentially distributed and all the heat conduction fins 305 are perpendicular to the branch tube; one side of each heat conduction fin 305 extends into the inside of the inner liner tube 302, and the corresponding spiral heat exchange outer tube 303 and the spiral heat exchange inner tube 304 penetrate through all the heat conduction fins 305. Function 1 of the heat conduction fin 305: Fix the inner liner tube 302 and the spiral heat exchange inner tube 304 inside the branch tube 301 and play a connecting role. Function 2: The cross-sectional shape of the heat conduction fin 305 is wavy, the contact area between the heat conduction fin 305 and the working medium is large, and the heat conduction fin 305 is parallel to the air flow direction, which does not affect the flow of cold and hot air in the branch tube 301 and the inner liner tube 302, and no frequency reduction problem occurs. At the same time, the heat conduction fin 305 is in direct contact with the spiral heat exchange outer tube 303 and the spiral heat exchange inner tube 304, and the heat conduction fin 305 greatly increases the heat exchange area, further improving the heat transfer efficiency of the hot air.

[0031] In this embodiment, the specific structure of the cooler 4 is: the cooler 4 is a heat conduction tube wound around the resonance tube 1, the heat conduction tube is integrated with the resonance tube 1, and the position where the cooler 4 is located forms a cold end. In order to utilize the condensate water of the central air conditioner indoor unit, the condensate water of the central air conditioner indoor unit in this embodiment flows through the low-temperature water storage tank, the cooler 4 of the thermoacoustic power generation system, and the high-temperature water storage tank in sequence and then is discharged outside, that is, the water in the low-temperature water storage tank overflows and flows through the cooler 4, and then enters the high-temperature water storage tank. After the water in the high-temperature water storage tank overflows, it is discharged outside again. The low-temperature cooling water greatly reduces the temperature of the cooler 4, increases the temperature difference between the working medium between the heater 3 and the cooler 4, and thus improves the power generation efficiency. In order to obtain a stable power supply, the output end of the thermoacoustic power generation system in this embodiment is electrically connected to a power conversion circuit, a charging controller, a battery, and a power manager in sequence. The alternating current output by the thermoacoustic power generation system forms a stable direct current power supply after passing through the power conversion circuit, and the direct current power supply stores electrical energy in the battery through the charging controller.

[0032] As Figures 5 to 7As shown, in order to solve the problem of high energy consumption in the existing central air conditioner cold and hot offset and dehumidification mode, this embodiment is provided with a humidity control system, the ventilation duct 13 of the humidity control system is connected with the air duct of the central air conditioner indoor unit, and the humidity of the air in the air duct is reduced by using the drying plate 8 in the ventilation duct 13. The specific structure of the humidity control system is: the humidity control system includes a cylinder 9 and a driving motor 10, a vacancy is provided in the middle of the cylinder 9, the drying plate 8 is in the shape of a disc, the drying plate 8 is rotatably connected to the vacancy and the two sides of the drying plate 8 are slidably sealed with the end surface corresponding to the cylinder 9; the driving motor 10 is fixed to the outside of the cylinder 9, and the driving motor 10 is connected to the drying plate 8 in a transmission manner; the cylinder 9 is provided with four axially extending partitions 11, and the inner cavity of the cylinder 9 is divided by the partitions 11 to form four channels with fan-shaped cross sections, one of which is a ventilation duct 13, two channels are regeneration channels 14, and one channel is a cooling channel 15; and 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, and when the ventilation duct 13 is directly opposite to the notch 16, the dehumidification mode is not turned on.

[0033] The output shaft of the driving motor 10 is provided with a gear 17, and the outer side of the drying plate 8 is sleeved with a gear ring 18, and the gear ring 18 is meshed with the gear 17. The driving motor 10 drives the drying plate 8 to rotate, so that the gap 16 is opposite to the four channels in turn. If the central air conditioner is turned on the dehumidification mode, the driving motor 10 drives the drying plate 8 to rotate, so that the ventilation duct 13 and the gap 16 are misaligned, and the air in the air duct flows through the drying plate 8. The moisture in the air is adsorbed by the desiccant of the drying plate 8, thereby reducing the air humidity, thereby achieving the dehumidification effect. When the 1 / 4 drying plate 8 facing the gap 16 reaches saturation, the driving motor 10 drives the drying plate 8 to rotate 45°, so that the other 1 / 4 part of the drying plate 8 faces the gap 16, and continues to dehumidify. The saturated 1 / 4 part faces the regeneration pipe 14, and is regenerated and restored by high-temperature air drying. The driving motor 10 drives the drying plate 8 to rotate 90 degrees, and the regenerated 1 / 4 part is directly opposite to the cooling channel 15. The external air cools the regenerated 1 / 4 part, solving the problem of the increase in air temperature in the air duct caused by secondary dehumidification. The intelligent control module rotates the driving motor 10 according to the rule, continuously dehumidifies the air in the air duct, and continuously regenerates at the same time.

[0034] The humidity control system in this embodiment is powered by a battery. Additionally, an electric heating wire is provided in each regeneration pipe 14, and the electric heating wire is electrically connected to a power supply manager. The output of the battery is supplied to the electric heating wire through the power supply manager, and the electric heating wire makes up for the insufficient air temperature that causes a slow regeneration speed. The battery can also supply power to the pressure compensating fan or other power-consuming parts of the central air conditioner, thereby achieving the purpose of energy conservation. A temperature sensor electrically connected to the intelligent control module is provided in the regeneration pipe 14. When the air temperature in the regeneration pipe 14 is lower than the set regeneration temperature, the intelligent control module energizes the electric heating wire to heat, thereby forming a temperature control closed loop.

[0035] The drying plate 8 in this embodiment has a porous structure, and a renewable desiccant is provided inside. The desiccant can use silica gel desiccant, but is not limited to silica gel desiccant. Compared with the existing evaporator for dehumidification, the desiccant of the drying plate 8 has the advantages of high dehumidification control accuracy and small temperature influence. To further improve the humidity control accuracy, the low-temperature water storage tank and the high-temperature water storage tank in this embodiment are respectively connected to the temperature mixing tank. The temperature mixing tank is connected to the air duct of the central air conditioner indoor unit through an atomizing pipe, and the atomizing pipe is located at the lower source of the drying plate 8. The temperature mixing tank is provided with an ultrasonic atomizing sheet, a pressure compensating fan is provided in the atomizing pipe, and the atomizing pipe is provided with air inlet holes. The water mist generated by the ultrasonic atomizing sheet is pumped into the air duct of the central air conditioner indoor unit through the pressure compensating fan. Water pumps electrically connected to the intelligent control module are provided in both the low-temperature water storage tank and the high-temperature water storage tank, and temperature probes electrically connected to the intelligent control module are provided in both the temperature mixing tank and the atomizing pipe. For example, when the set indoor temperature of the central air conditioner is 26°C, the intelligent control module controls the pumping ratio of the two water pumps according to the water temperature feedback by the temperature probe, so that the air temperature in the atomizing pipe is 26°C, thereby avoiding the problem that the air temperature changes due to water mist mixing into the air duct.

[0036] The energy efficiency control management method of the intelligent control module in this embodiment is as follows: In summer, when the central air conditioner is in the cooling mode, the hot air blown out by the cooling tower is used to generate electricity, and the electric energy is stored in the battery. The battery can be used by the energy-consuming parts of the central air conditioner, such as the fan of the indoor unit, the electric heating element, the control panel, etc. The heat energy is converted into electric energy, and the intelligent control module distributes the electric energy as needed, reducing the electricity cost of the central air conditioner. At the same time, the external hot air is utilized to avoid the direct discharge of heat energy.

[0037] If the central air conditioner is turned on in the dehumidification mode, the intelligent control module causes the drive motor 10 to drive the drying plate 8 to rotate, so that the ventilation duct 13 is misaligned with the notch 16, and the misalignment angle is determined according to the dehumidification requirement. That is, the dehumidification amount can be adjusted by changing the facing area between the drying plate 8 and the notch 16, dehumidifying as needed, and the dehumidification accuracy is high. A temperature and humidity sensor electrically connected to the intelligent control module is provided at the lower source of the drying plate 8. When the detected humidity value at the lower source is greater than the set humidity value, the intelligent control module causes the drive motor 10 to drive the drying plate 8 to continue rotating, so that the drying part of the drying plate 8 rotates to the notch 16, thereby maintaining the dehumidification ability. The water-absorbed saturated drying part rotates to the regeneration duct 14, and after passing through the two regeneration ducts 14, the water absorption ability is restored. Finally, after passing through the cooling channel 15, the cooling channel 15 is communicated with the external atmosphere, and air is blown in by a blower to lower the temperature of the drying plate 8 passing through the regeneration part. The electric heating wire in the regeneration duct 14 is controlled by the intelligent control module to start and stop, which can improve the regeneration speed. Although the compressor of the central air conditioner is still working in the dehumidification mode, the evaporator dehumidifies while the drying plate 8 dehumidifies at the same time, thus greatly accelerating the dehumidification speed, reducing the working time of the compressor, and reducing the power consumption.

[0038] The above energy efficiency management method is to heat the low-grade hot air discharged from the cooling tower by the solar air heater to meet the power generation requirements of the thermoacoustic power generation system. If it is not heated by the solar air heater, the low-grade hot air still cannot be utilized. Therefore, the energy efficiency management method of this embodiment depends on the heating step of the solar air heater and can only be realized during the day. However, in real life, some office buildings and libraries still need the central air conditioner to work continuously at night in summer, and the heating effect of the solar air heater is almost zero at night. In order to utilize the low-grade hot air in the night mode as well, this embodiment is realized through the following scheme: Such as Figure 8 And Figure 9As shown in the figure, it includes a heat storage pool 19, which is connected to the tap water pipe and kept full by a float level gauge. Inside the heat storage pool 19, heat exchange air pipes 20 are distributed. The air outlet of the cooling tower of the central air conditioner is provided with an air collecting hood, which is respectively connected to one end of the heat exchange air pipe 20 and a solar air heater through 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 to the outside. When the sun goes down and the power generation of the thermoacoustic power generation system significantly weakens, the reversing valve switches the low-grade hot air to the heat exchange air pipe 20. The temperature of the tap water is lower than that of the low-grade hot air, and the low-grade hot air exchanges heat with the water in the heat storage pool 19, raising the water temperature and making full use of the low-grade heat energy. The heat storage pool 19 is connected to the daily hot water pipeline in buildings such as office buildings and libraries nearby. When the water temperature in the heat storage pool 19 reaches the set water temperature, the solenoid valve between the heat storage pool 19 and the daily hot water pipeline opens to meet the daily hot water demand, thus making full use of the low-grade heat source, reducing the usage frequency of natural gas water heaters or electric water heaters at the same time, and saving energy and reducing emissions.

[0039] The temperature of the hot water used in daily life in summer is generally 35 - 42 °C. However, the specific heat capacity of water is relatively large, and it may not be possible to heat the water temperature in the heat storage pool 19 to the usable temperature only by using the heat discharged from the cooling tower at night. For this reason, the heat storage pool 19 in this embodiment is provided with an openable heat preservation cover 21. During the day, the heat preservation cover 21 is opened, and the heat storage pool 19 is exposed to the outside to raise the water temperature by using sunlight. In addition, one end of the heat exchange air pipe 20 is also connected to a humidity control system. During the day, the air collecting hood is connected to the solar air heater through a reversing valve, and the sub-high-temperature hot air passes through the humidity control system and then is discharged outside through the heat exchange air pipe 20, using the waste heat of the sub-high-temperature hot air to further increase the water temperature in the heat storage pool 19. At night, the heat preservation cover 21 is closed to seal the heat storage pool 19 inside to prevent the water temperature from dissipating at night.

[0040] However, in the actual use process, the volume of the heat storage pool 19 may be relatively large, and it may take several days to raise the water temperature to above 35 °C. The heat storage pool 19 serves as a standby hot water pool, and its main function is to absorb low-grade heat sources to avoid wasting this part of the heat source by directly discharging it to the outside. As the heat in the heat storage pool 19 continuously accumulates until the water temperature reaches above 35 °C, the solenoid valve between the heat storage pool 19 and the daily hot water pipeline opens. When the water level drops to the set water level, the float level gauge opens the tap water pipe to automatically replenish water.

[0041] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An energy efficiency control and management controller for a central air-conditioning cold and heat source machine room, characterized in that: It includes an intelligent control module, a thermoacoustic power generation system and a humidity control system electrically connected to the intelligent control module; The hot air discharged from the cooling tower of the central air conditioner is heated by a solar air heater, then passes through the heater of the thermoacoustic power generation system, and the hot air is used to generate electricity for the thermoacoustic power generation system, then passes through the regeneration pipeline of the humidity control system, and the hot air is used to regenerate the desiccant of the humidity control system, then passes through the heat storage tank, and finally discharged; or the hot air discharged from the cooling tower of the central air conditioner is discharged after passing through the heat storage tank, the heat storage tank is filled with tap water, and the heat storage tank is connected to the daily water pipe; The thermoacoustic power generation system includes a free piston thermoacoustic engine and a linear generator; the free piston thermoacoustic engine includes a resonance tube and a regenerator located inside the resonance tube, the heater and the cooler are integrated with the resonance tube, and the heater and the cooler 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 a plurality of branch pipes fixedly connected to the side wall of the resonance tube, and all the branch pipes are distributed along the circumference of the resonance tube; all the branch pipes are provided with inner lining pipes inside, and all the branch pipes and all the inner lining pipes are connected with the resonance tube; each branch pipe is provided with a spiral heat exchange outer pipe extending along the axial direction inside, and the side wall of each inner lining pipe is inlaid with a spiral heat exchange inner pipe extending along the axial direction, so that a part of the spiral heat exchange inner pipe is located on the inner side of the inner lining pipe, and another part is located between the inner lining pipe and the branch pipe; all the spiral heat exchange outer pipes are connected to the spiral heat exchange inner pipe to form a heat exchange channel, and the two ends of the heat exchange channel are respectively connected with the solar air heater and the regeneration pipeline; The ventilation duct of the humidity control system is connected to the air duct of the central air conditioner indoor unit, and the humidity of the air in the air duct is reduced by using the drying plate in the ventilation duct; The condensed water of the central air-conditioning indoor unit flows through the low-temperature water tank, the cooler of the thermoacoustic power generation system and the high-temperature water tank in turn and is discharged. The low-temperature water tank and the high-temperature water tank are connected to the mixed temperature water tank respectively. The mixed temperature water tank is connected to the air duct of the central air-conditioning indoor unit through the atomizing pipe, and the atomizing pipe is located at the lower source of the drying plate.

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

3. The energy efficiency control and management controller for a central air-conditioning cold and heat source machine room according to claim 2, wherein: Each branch pipe is provided with a plurality of heat-conducting fins extending in the radial direction inside, all of which are distributed in the circumferential direction and are perpendicular to the branch pipes; one side of each heat-conducting fin extends to the inside of the inner lining pipe, and the corresponding spiral heat exchange outer pipe and spiral heat exchange inner pipe penetrate all the heat-conducting fins.

4. The energy efficiency control and management controller for a central air-conditioning cold and heat source machine room according to claim 3, characterized in that: The humidity control system comprises a cylinder and a driving motor. A vacancy is provided in the middle of the cylinder. The drying plate is in the shape of a disc. The drying plate is rotatably connected to the vacancy and the two side surfaces of the drying plate are slidably sealed with the end surface corresponding to the cylinder. The driving motor is fixed to the outside of the cylinder and is drivingly connected to the drying plate. Inside the cylinder, there are four partitions extending axially. The inner cavity of the cylinder is divided by the partitions to form four channels with fan-shaped cross-sections. One of the channels is a ventilation duct, two channels are regeneration ducts, and one channel is a cooling channel. Pipe joints corresponding to each channel are provided at both ends of the cylinder.

5. An energy efficiency control and management controller for a central air-conditioning cold and heat source machine room according to claim 4, characterized in that: The drying plate is provided with a notch corresponding to the ventilation duct. A gear is provided on the output shaft of the driving motor. A toothed ring is sleeved outside the drying plate, and the toothed ring meshes with the gear. The drying plate is driven to rotate by the driving motor, so that the notch rotates to face the four channels in turn.

6. The energy efficiency control and management controller for a central air-conditioning cold and heat source machine room according to claim 5, characterized in that: The mixing water tank is provided with an ultrasonic atomization sheet, and a pressure compensating fan is arranged in the atomization pipe. The water mist generated by the ultrasonic atomization sheet is pumped into the air duct of the central air-conditioning indoor unit by the pressure compensating fan.

7. The energy efficiency control and management controller for a central air-conditioning cold and heat source machine room according to claim 6, characterized in that: The output end of the thermoacoustic power generation system is electrically connected to a power conversion circuit, a charging controller, a battery and a power manager in sequence. Electric heating wires are arranged in each regeneration duct, and the electric heating wires are electrically connected to the power manager.

8. The energy efficiency control and management controller for the central air-conditioning cold and heat source machine room according to claim 1, wherein: Heat exchange air pipes are distributed inside the heat storage pool. One end of the heat exchange air pipe is communicated with the humidity control system, and the other end is discharged to the outside. The heat storage pool is provided with an openable heat preservation cover.

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