Control method for ultrasonic atomization heat transfer enhancement of central air conditioner

Abstract

The invention relates to a control method for ultrasonic atomization enhanced heat exchange of a central air conditioner. The control method comprises the steps that 1, the environment humidity RH and the operation state of an air conditioner compressor are monitored in real time; (2) when the compressor runs and RH is smaller than 70%, the ultrasonic atomizer is started, and an ultrasonic atomizing piece in the ultrasonic atomizer works; (3) detecting the water level based on an electrode sensor in the ultrasonic atomizer, and maintaining the water surface to cover the atomizing sheet by 3 + / -0.5 mm; (4) dynamically adjusting the atomization power P based on the condensation temperature Tcond: P = Pmax * (Tmax-Tset) / (Tcond-Tset); (Tset < = Tbond < = Tmax). According to the control method, the atomization modules arranged in an array mode are arranged on the air inlet side of the central air conditioner outdoor unit, water atomization heating and cooling are achieved through the atomization modules, meanwhile, the ultrasonic atomization power is reasonably adjusted based on the environment humidity and the condensation temperature, and the heat exchange efficiency of the central air conditioner outdoor unit can be effectively improved.

Description

Technical field:

[0001] The present invention relates to the technical field of heat exchange enhancement methods, and more particularly to a control method for heat exchange enhancement by ultrasonic atomization of a central air conditioner. Background technology:

[0002] As an air conditioning system, the core function of a central air conditioning system is to regulate the temperature, humidity, and cleanliness of the indoor environment. The system uses cooling equipment to provide cooling to offset the indoor cooling load, and heating equipment to provide heat to offset the indoor heating load, forming a complete cooling and heating regulation mechanism. However, central air conditioning units experience reduced heat exchange efficiency in hot, dry environments. The reasons for this are as follows: 1. Excessively high outdoor temperatures hinder heat dissipation in the outdoor unit, affecting the condenser's efficiency, increasing the compressor load, and reducing cooling capacity. 2. Dry air has low humidity and poor heat absorption, further reducing heat exchange efficiency. 3. Dust accumulation on the heat exchanger surface hinders air circulation and reduces heat exchange efficiency. Some have proposed uniformly distributing water mist on the air inlet side of the central air conditioning unit's heat exchanger. This mist can increase humidity, absorb heat through evaporation, and improve heat dissipation. It can also remove dust from the heat exchanger fins, effectively enhancing the heat exchange efficiency of the central air conditioning unit. However, uniformly distributing the mist, rather than continuously spraying it, wastes energy and results in low heat exchange efficiency. Therefore, a misting control method that effectively enhances heat exchange is needed. Summary of the invention:

[0003] The purpose of the present invention is to address the deficiencies of the existing technology and provide a control method for central air-conditioning ultrasonic atomization enhanced heat exchange, which adjusts the power of ultrasonic atomization based on ambient humidity and condensation temperature, and can effectively enhance the heat exchange efficiency of the central air-conditioning outdoor unit.

[0004] A control method for central air conditioning ultrasonic atomization enhanced heat exchange, characterized by comprising the steps of:

[0005] ①. Real-time monitoring of ambient humidity RH and air conditioning compressor operating status;

[0006] ② When the compressor is running and RH is less than 70%, the ultrasonic atomizer is started and the ultrasonic atomizer sheet in the ultrasonic atomizer works;

[0007] ③. Use the electrode sensor inside the ultrasonic atomizer to detect the water level and maintain the water surface covering the atomizing sheet at 3±0.5mm;

[0008] ④. Dynamically adjust the atomization power P based on the condensation temperature Tcond:

[0009] P=Pmax×(T max -T set ) / (T cond -T set );

[0010] (T set ≤Tcond≤Tmax);

[0011] P is the atomization power; Pmax is the maximum atomization power; Tcond is the actual condensation temperature; Tset is the set condensation temperature; Tmax is the maximum allowable condensation temperature.

[0012] Preferably, the ultrasonic atomizer is fixedly connected to the air inlet side of the heat exchanger of the central air-conditioning main unit; the ultrasonic atomizer is composed of a plurality of array-distributed atomization modules, the atomization module includes a vertical atomization tank box, the bottom of the atomization tank box is formed with a bottom plate with an inclination angle of 2°, the atomization tank box is provided with ultrasonic atomization sheets immersed in water and distributed in an array, an atomization sheet mounting base with an inclination angle of 5° is provided below the ultrasonic atomization sheet, the atomization sheet mounting base is fixedly connected to the atomization tank box, a silica gel honeycomb pad is provided between the bottom plate of the atomization tank box and the atomization sheet mounting base, a damping grid is provided above the water surface in the atomization tank box, and the distance between the damping grid and the water surface is 5 mm;

[0013] The box wall of the atomizing tank box is respectively formed with water inlet holes and drainage holes distributed on the upper and lower sides, and the drainage hole is located on one side of the lower end of the bottom plate; a water inlet pipe is inserted and fixed in the water inlet hole, and a water supply main is provided between the atomizing tank boxes, and the end of the water inlet pipe is fixedly connected to the water supply main, and a water pump is fixedly connected to the water supply main.

[0014] Preferably, the atomizing tank box is provided with an integrated silicone capillary water seepage belt, which is fixed to the atomizing plate mounting base outside the ultrasonic atomizing plate;

[0015] The integrated silicone capillary water seepage belt adopts a thin-walled silicone tube, in which a capillary layer structure is arranged. The capillary layer structure includes an embedded porous medium in the thin-walled silicone tube, and a plurality of micropores are formed on the outer surface of the thin-walled silicone tube.

[0016] Preferably, the atomizing tank box 1 is fixedly connected with three groups of upper and lower distributed liquid level sensors, and the three groups of liquid level sensors all adopt electrode sensors. The three groups of liquid level sensors include a high water level sensor, a low water level sensor and an emergency water level sensor;

[0017] In step ③, when the water level triggers the emergency water level sensor, the ultrasonic atomizer is powered off and stops; when the water level triggers the low water level sensor, the water pump is started to add water to the atomizer tank box; when the water level triggers the high water level sensor, the water pump is turned off and the addition of water to the atomizer tank box is stopped.

[0018] Preferably, the bottom of the atomizing tank box is fixedly connected to a PCT heater, and a temperature sensor is fixedly connected to the central air-conditioning host;

[0019] In step ④, when the ambient temperature is ≤5°C, activate the PTC heater at the bottom of the atomizer box to maintain the water temperature ≥8°C.

[0020] Preferably, a box cover is buckled on the top of the atomizer tank box, and a plurality of atomizer release holes are formed on the box cover;

[0021] The lower end surface of the outer ring of the damping grid abuts against an annular support retaining ring, and the support retaining ring is fixed on the inner wall of the atomization tank box.

[0022] Preferably, the atomizing tank box needs to shut down the ultrasonic atomizing piece every week, drain the sewage, run the water pump at full power for 30 seconds, and refill water; and perform multiple emptying and refilling of water in a pulse manner to flush the atomizing tank box.

[0023] The beneficial effects of the present invention are:

[0024] This control method sets up an array of atomization modules on the air inlet side of the central air-conditioning outdoor unit. The atomization module realizes water atomization heating and cooling. At the same time, the power of ultrasonic atomization is reasonably adjusted based on the ambient humidity and condensation temperature, which can effectively enhance the heat exchange efficiency of the central air-conditioning outdoor unit. Description of the drawings:

[0025] Figure 1 Schematic diagram of the control method of the present invention;

[0026] Figure 2 Schematic diagram of the layout of the ultrasonic atomizer in the present invention

[0027] Figure 3 This is a three-dimensional structural diagram of the atomization module of the present invention;

[0028] Figure 4 It is a cross-sectional structural diagram of the atomization module of the present invention.

[0029] In the figure: 10, atomization module; 1, atomization tank box; 2, silicone honeycomb pad; 3, atomization plate mounting base; 4, ultrasonic atomization plate; 5, integrated silicone capillary water seepage belt; 6, damping grid; 7, box cover; 8, support retaining ring; 20, heat exchanger; 30, guide plate. Specific implementation method:

[0030] Example: See Figure 1 As shown, the control method of ultrasonic atomization enhanced heat exchange of central air conditioning is characterized by comprising the steps of:

[0031] ①. Real-time monitoring of ambient humidity RH and air conditioning compressor operating status;

[0032] ② When the compressor is running and RH is less than 70%, the ultrasonic atomizer is started and the ultrasonic atomizer sheet in the ultrasonic atomizer works;

[0033] ③. Use the electrode sensor inside the ultrasonic atomizer to detect the water level and maintain the water surface covering the atomizing sheet at 3±0.5mm;

[0034] ④. Dynamically adjust the atomization power P based on the condensation temperature Tcond:

[0035] P=Pmax×(T max -T set ) / (T cond -T set );

[0036] (T set ≤Tcond≤Tmax);

[0037] P is the atomization power; Pmax is the maximum atomization power; Tcond is the actual condensation temperature; Tset is the set condensation temperature; Tmax is the maximum allowable condensation temperature.

[0038] Preferably, the ultrasonic atomizer is fixedly connected to the air inlet side of the central air conditioner main heat exchanger; Figure 2 As shown, the ultrasonic atomizer is composed of a plurality of array-distributed atomizing modules 10, the air inlet of the central air-conditioning main unit heat exchanger is provided with a guide plate 30, and the atomizing modules 10 are divided into two rows and arranged between the guide plate 30 and the heat exchanger 20; Figure 3 、 4 As shown, the atomization module 10 includes a vertical atomization tank box 1, the bottom of which is formed with a bottom plate 11 with an inclination angle of 2°. The atomization tank box 1 is provided with ultrasonic atomization sheets 4 immersed in water and distributed in an array. The vibration frequency of the ultrasonic atomization sheets 4 is 1.7-2.4MHz, and the power density is ≥0.33W / cm 2 ; An atomizer installation substrate 3 with an inclination angle of 5° is provided under the ultrasonic atomizer 4, and the bottom plate 11 of the atomizer tank box 1 is designed to have an inclination angle of 2°, so that scale can flow down along the bottom plate 11, and it is convenient to remove scale during flushing; and the inclination angle of the ultrasonic atomizer 4 is 5°, which destroys the formation of standing waves, and cooperates with the damping grid 6 to suppress the horizontal shifting caused by atomization, and can optimize the uniformity of atomization; the atomizer installation substrate 3 is fixedly connected to the atomizer tank box 1, and a silicone honeycomb pad 2 is provided between the bottom plate 11 of the atomizer tank box 1 and the atomizer installation substrate 3, and the silicone honeycomb pad 2 can achieve vibration reduction; a damping grid 6 is provided above the water surface in the atomizer tank box 1, and the distance between the damping grid 6 and the water surface is 5mm; when the water depth on the surface of the atomizer is maintained at 3±0.5mm and the atomization power density is ≥0.33W / cm 2 When the temperature of the fin surface is reduced by 8.3℃, the condensing temperature is reduced by 4.7℃, and the system COP is improved by 17.2%.

[0039] The wall of the atomizing tank box 1 is formed with water inlet holes 12 and drainage holes 13 distributed at the upper and lower ends, respectively. The drainage hole 13 is located on one side of the lower end of the bottom plate 11. A water inlet pipe is inserted and fixed into the water inlet hole 12. A water supply pipe is provided between the atomizing tank box 1. The end of the water inlet pipe is fixedly connected to the water supply pipe, and the water supply pipe is fixedly connected to a water pump.

[0040] The above-mentioned atomizer tank box 1 is made of stainless steel and its size can be 310×310×40mm (adapted to 300×300mm atomizer plate mounting base). Six ultrasonic atomizer plates 4 are provided on the atomizer plate mounting base 3, which are installed at an angle of 5°. The thickness of the silicone honeycomb pad 2 is 3mm, and a hole is opened to avoid the ultrasonic atomizer plate 4. The water inlet hole 12 is provided. Quick-connect connector (with anti-siphon hole), set at the drain outlet Drain valve (for draining during maintenance).

[0041] The atomizing tank box 1 is provided with an integrated silicone capillary water seepage belt 5, which is fixed to the atomizing plate mounting base 3 outside the ultrasonic atomizing plate 4;

[0042] The integrated silicone capillary water seepage belt 5 is a thin-walled silicone tube with a capillary layer structure provided therein. The capillary layer structure includes an embedded porous medium in the thin-walled silicone tube, and a plurality of micropores are formed on the outer surface of the thin-walled silicone tube. The integrated silicone capillary water seepage belt 5 utilizes the capillary effect to supply water to the ultrasonic atomizing sheet 4. When the ultrasonic atomizing sheet 4 is used, it can prevent blockage and has good self-interference resistance.

[0043] The atomizing tank box 1 is fixedly connected with three groups of liquid level sensors distributed on the upper and lower sides. The three groups of liquid level sensors all adopt electrode sensors. The three groups of liquid level sensors include a high water level sensor, a low water level sensor and an emergency water level sensor.

[0044] In step ③, when the water level triggers the emergency water level sensor, the ultrasonic atomizer 4 is powered off and stops; when the water level triggers the low water level sensor, the water pump is started to add water to the atomizer tank box 1; when the water level triggers the high water level sensor, the water pump is turned off and the addition of water to the atomizer tank box 1 is stopped.

[0045] The bottom of the atomizing tank box 1 is fixedly connected to a PCT heater, and a temperature sensor is fixedly connected to the central air-conditioning host; in step ④, when the ambient temperature is ≤5°C, the PTC heater at the bottom of the atomizing tank box 1 is activated to maintain the water temperature ≥8°C.

[0046] A box cover 7 is buckled on the top of the atomizer tank box 1, and a plurality of atomization release holes 71 are formed on the box cover 7; the lower end surface of the outer ring of the damping grid 6 abuts against an annular support retaining ring 8, and the support retaining ring 8 is fixed on the inner wall of the atomizer tank box 1.

[0047] The atomizing tank box 1 needs to close the ultrasonic atomizing piece 4 every week, empty the sewage, run the water pump at full power for 30 seconds, and refill water; the atomizing tank box 1 is flushed in a pulse manner of emptying the water and refilling water multiple times, so that it can be automatically cleaned.

[0048] Working principle: This structure is a control method for central air conditioning ultrasonic atomization to enhance heat exchange. This control method and the ultrasonic atomizer in the control method are used for testing. The recorded data are as follows: 1. Ambient temperature record:

[0049]

[0050] Measuring tools: Temperature and humidity: Testo 635-1 (accuracy ±0.5°C); wind speed: KANOMAX 6113 (accuracy ±0.1m / s);

[0051] 2. Air conditioning operation data:

[0052]

[0053] Sensor calibration certificate numbers: Power analyzer: CAL-2024-0012 (valid until October 2025); PT100 temperature sensor: CAL-2024-0045

[0054] 3. Atomization system parameters:

[0055]

[0056] Test method: Atomization volume: weighing method (accuracy ±1ml); Water quality: HACH DR3900 spectrophotometer;

[0057] 4. Heat exchanger surface condition record

[0058]

[0059] Evaluation criteria: Scaling level: 0 = no visible deposits, 5 = complete blockage;

[0060] Combined with the recorded data, this control method can effectively enhance the heat exchange efficiency of the central air-conditioning outdoor unit, and has the following advantages: humidity sensing energy saving, automatically stopping atomization when humidity is greater than 70%, avoiding ineffective humidification (actual measurement reduces water and electricity consumption by 38%); dynamic power adjustment: when the condensing temperature is 45°C, atomization power = 300*(45-40) / (50-40) = 150W (saving 50% energy consumption); anti-freeze protection: PTC heating is started in a 5°C environment to avoid ice cracking (passed the -10°C test).

[0061] The embodiments are intended to illustrate the present invention and are not intended to limit the present invention. Any person skilled in the art may modify the embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be as set forth in the claims of the present invention.

Claims

1. A control method for central air conditioning ultrasonic atomization enhanced heat exchange, characterized by: Including steps: ①. Real-time monitoring of ambient humidity RH and air conditioning compressor operating status; ② When the compressor is running and RH is less than 70%, the ultrasonic atomizer is started and the ultrasonic atomizer sheet in the ultrasonic atomizer works; ③. Use the electrode sensor inside the ultrasonic atomizer to detect the water level and maintain the water surface covering the atomizing sheet at 3±0.5mm; ④. Dynamically adjust the atomization power P based on the condensation temperature Tcond: P=Pmax×(Tmax-Tset) / (Tcond-Tset); (Tset≤Tcond≤Tmax); P is the atomization power; Pmax is the maximum atomization power; Tcond is the actual condensation temperature; Tset is the set condensation temperature; Tmax is the maximum allowable condensation temperature.

2. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 1, characterized in that: The ultrasonic atomizer is fixedly connected to the air inlet side of the central air-conditioning main unit heat exchanger; the ultrasonic atomizer is composed of a plurality of array-distributed atomizing modules (10), the atomizing module (10) includes a vertical atomizing tank box (1), the bottom of the atomizing tank box (1) is formed with a bottom plate (11) with an inclination angle of 2°, the atomizing tank box (1) is provided with an ultrasonic atomizing sheet (4) immersed in water and distributed in an array, the bottom of the ultrasonic atomizing sheet (4) is provided with an atomizing sheet mounting substrate (3) with an inclination angle of 5°, the atomizing sheet mounting substrate (3) is fixedly connected to the atomizing tank box (1), a silica gel honeycomb pad (2) is provided between the bottom plate (11) of the atomizing tank box (1) and the atomizing sheet mounting substrate (3), a damping grille (6) is provided above the water surface in the atomizing tank box (1), and the distance between the damping grille (6) and the water surface is 5 mm; The wall of the atomizing tank box (1) is respectively formed with water inlet holes (12) and drainage holes (13) distributed in the upper and lower directions, and the drainage hole (13) is located on one side of the lower end of the bottom plate (11); a water inlet pipe is fixedly inserted into the water inlet hole (12), and a water supply main pipe is provided between the atomizing tank boxes (1), and the end of the water inlet pipe is fixedly connected to the water supply main pipe, and a water pump is fixedly connected to the water supply main pipe.

3. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 2, characterized in that: An integrated silicone capillary water seepage belt (5) is provided in the atomizing tank box (1), and the integrated silicone capillary water seepage belt (5) is fixedly connected to the atomizing plate mounting base plate (3) outside the ultrasonic atomizing plate (4); The integrated silicone capillary water seepage belt (5) adopts a thin-walled silicone tube, and a capillary layer structure is provided in the thin-walled silicone tube. The capillary layer structure includes an embedded porous medium located in the thin-walled silicone tube, and a plurality of micropores are formed on the outer surface of the thin-walled silicone tube.

4. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 2, characterized in that: The atomizing tank box (1) is fixedly connected with three groups of liquid level sensors distributed on the upper and lower sides, and the three groups of liquid level sensors all adopt electrode sensors. The three groups of liquid level sensors include a high water level sensor, a low water level sensor and an emergency water level sensor. In step ③, when the water level triggers the emergency water level sensor, the ultrasonic atomizing plate (4) is powered off and stopped; when the water level triggers the low water level sensor, the water pump is started to add water to the atomizing tank box (1); when the water level triggers the high water level sensor, the water pump is turned off and the addition of water to the atomizing tank box (1) is stopped.

5. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 2, characterized in that: The bottom of the atomizing tank box (1) is fixedly connected to a PCT heater, and a temperature sensor is fixedly connected to the central air-conditioning main unit; In step ④, when the ambient temperature is ≤5°C, the PTC heater at the bottom of the atomizing tank box (1) is activated to maintain the water temperature ≥8°C.

6. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 2, characterized in that: A box cover (7) is buckled on the top of the atomizing tank box (1), and a plurality of atomizing release holes (71) are formed on the box cover (7); The lower end surface of the outer ring of the damping grid (6) abuts against an annular support retaining ring (8), and the support retaining ring (8) is fixed on the inner wall of the atomization tank box (1).

7. The control method for ultrasonic atomization enhanced heat exchange of a central air conditioner according to claim 2, characterized in that: The atomizing tank box (1) needs to shut down the ultrasonic atomizing plate (4) every week, drain the sewage, run the water pump at full power for 30 seconds, and refill water; and perform multiple emptying and refilling in a pulse manner to flush the atomizing tank box (1).

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