Air conditioner electricity-saving control system and control method

Abstract

The invention provides a power-saving control device for an air conditioner. The power-saving control device comprises a microprocessor, a refrigerator, air outlet equipment and a temperature controller, the microprocessor is connected with the refrigerator; the microprocessor is connected with the air outlet equipment; the microprocessor is connected with the temperature controller; the microprocessor is used for setting a temperature range and receiving the real-time sensing temperature of the temperature controller; when the real-time sensing temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to work for refrigeration until the real-time sensing temperature is at the preset temperature, and the refrigerator is unloaded and stops running; and when the real-time sensed temperature reaches a preset temperature, the microprocessor controls the air outlet equipment to continuously discharge air so as to blow out cold air in the refrigerator. According to the optimized air-conditioning system, the starting and stopping frequency of the air-conditioning main machine is reduced, meanwhile, the impact on the air-conditioning equipment caused by starting of the main machine is reduced, the air-conditioning equipment is protected, and the electricity saving rate reaches 20%-40%.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial air-conditioning energy saving, and in particular to an air-conditioning power saving control system and a control method. Background Art

[0002] Air conditioners are widely used in industrial applications to ensure the operating status of industrial equipment. In order to save energy, air conditioner energy savers are usually used.

[0003] There are two ways to control the energy saving of air conditioners: one is to disconnect the main power line of the compressor and connect a timer in series to control the start and stop of the compressor; the other is to cut the 12V signal line and connect a timer in series to control the on and off of the main contactor, thereby controlling the start and stop of the compressor.

[0004] However, the first method of use has poor safety performance. Since it requires too much current, the process cannot meet the requirements, and the compressor will start and stop again, and start and stop again, which may easily cause damage to the compressor. The second method of use may easily cause the air conditioner's own control system to be disordered, and the air conditioner cannot work normally after a fault, and the user cannot restore it by himself. In addition, the timer is connected in series, which will control the air conditioner to start and stop forcibly, and the cooling effect cannot be guaranteed. Summary of the Invention

[0005] The object of the present invention is to provide an air conditioner power control device and control method to solve the problem proposed in the above background technology that a timer connected in series will control the forced start and stop of the air conditioner and cannot ensure the cooling effect.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An air conditioner power control device, comprising: a microprocessor, a refrigerator, an air outlet device, and a thermostat;

[0008] The microprocessor is connected to the refrigerator; the microprocessor is connected to the air outlet device; the microprocessor is connected to the thermostat;

[0009] The microprocessor is used to set the temperature range and receive the real-time sensed temperature of the thermostat;

[0010] When the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for cooling until the real-time sensed temperature reaches a predetermined temperature, and the refrigerator is unloaded and stops operating; wherein the predetermined temperature is any temperature within the temperature range;

[0011] When the real-time sensed temperature reaches a predetermined temperature, the microprocessor controls the air outlet device to continuously discharge air, so as to blow out the cold air in the refrigerator.

[0012] Optionally, the cooler includes: a compressor and a main cooler pipeline; the microprocessor is controllably connected to the compressor;

[0013] A compressor control algorithm is implanted in the microprocessor, and the microprocessor controls the compressor through the compressor control algorithm;

[0014] The compressor control algorithm includes:

[0015] P = Kp×e(t); where Kp is the proportional gain and e(t) is the error (i.e., the difference between the target temperature and the actual temperature);

[0016] I = Ki×∫e(t)dt, where Ki is the integral gain and e(t) is the error;

[0017] D = Kd×(de(t) / dt), where Kd is the derivative gain and de(t) / dt is the rate of change of the error;

[0018] u(t) = Kp·e(t) + Ki·∫e(t)dt + Kd·(de(t) / dt); where u(t) is the output of the controller (adjusting the power or speed of the compressor), and e(t) is the error (target value - current value).

[0019] Optionally, when the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the cooler to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the cooler unloads and stops running. The microprocessor controls the start and stop of the compressor based on the PID algorithm; when the real-time sensed temperature is higher than the highest point of the temperature range, the current real-time sensed temperature is used as the current value; the predetermined temperature is used as the target value, and the error e(t) is obtained; and the compressor is controlled to start using the PID algorithm until the real-time sensed temperature reaches the predetermined value, and then the compressor stops working.

[0020] Optionally, within a predetermined time period: the total heat discharged by the equipment at the installation location < the refrigeration capacity of the cooler;

[0021] Determine the refrigeration capacity of the cooler after running for a predetermined time period;

[0022] Determine the heat generation of the host within a predetermined time period;

[0023] The calculation formula is as follows:

[0024] M + N = I + kS

[0025] Where M is the refrigeration capacity, N is the refrigeration capacity to the predetermined temperature, I is the heat generation of the host, S is the ambient heat; K is the ambient temperature influence coefficient.

[0026] Optionally, the air outlet device is a wind wheel; the temperature controller is a temperature sensor;

[0027] The power saving control device is installed in the cooler of the electric control cabinet; the wind wheel is used to face the cold air duct of the cooler compressor, and the wind direction faces the air outlet of the cooler;

[0028] A plurality of temperature sensors are arranged in the electric control cabinet; each of the temperature sensors is respectively connected to the microprocessor, and the real-time sensed temperature is the average value of the temperatures sensed by each of the temperature sensors.

[0029] Optionally, the compressor control algorithm further includes: a demand response control algorithm, including:

[0030] Data acquisition and monitoring: Deploy sensors to collect the operation data of the compressor in real time and obtain the grid load status according to the data of the State Grid;

[0031] Establish a DR strategy model: Establish a dynamic adjustment model of the compressor according to the load status, electricity price, and climate conditions;

[0032] Automation control system: Implement an automated control strategy to adjust the operating speed and time of the compressor through a frequency converter or an intelligent control system.

[0033] Optionally, in the step of establishing a DR strategy model: Establish a dynamic adjustment model of the compressor according to the load status, electricity price, and climate conditions:

[0034] Energy consumption (E) of the compressor:

[0035] E = P(t)·Δt;

[0036] Wherein, (P(t)) is the power consumption of the compressor at time (t), which is usually related to factors such as rotational speed and load; (Δt) is the time interval, usually in hours;

[0037] Electricity price model:

[0038] Cost(t) = E(t)·Price(t);

[0039] Wherein, (Cost(t)) is the electricity cost of the compressor at time (t); (E(t)) is the energy consumption at this time;

[0040] Load demand model:

[0041] L(t) = f(T(t), G(t));

[0042] Among them, (L(t)) is the compressor load demand at time (t), (T(t)) is the external air temperature, and (G(t)) is the grid load;

[0043] When the electricity price is high or the grid load is large, the compressor is controlled to reduce its speed; during periods when the electricity price is low or the load is small, the compressor is controlled to increase its speed.

[0044] Optionally, the operating parameters of the microprocessor are: rated voltage: 220V - 380V; between the power frequency voltage power supply terminal and the ground: AC 1.5 - 2.5KV (220, 380) for 60 seconds at 50MW; impulse voltage 6KV without breakdown and without flicker; insulation resistance between the power supply terminal and the ground: 50MW↑ (DC 500V); leakage power between the power supply terminal and the ground: AC220, 380V 1Ma↓; overload 2 times the rated current for 2 minutes; no-load loss: below 0.9%; no-load current: below 0.6%; voltage and current waveform distortion rate: 0.

[0045] An air conditioner power-saving control method includes:

[0046] The user inputs a set temperature range to the microprocessor through the client;

[0047] The thermostat acquires the real-time sensed temperature and sends the real-time sensed temperature to the microprocessor;

[0048] The microprocessor compares the real-time sensed temperature with the temperature range:

[0049] When the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops running; wherein, the predetermined temperature is any temperature within the temperature range;

[0050] When the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air to blow out the cold air in the refrigerator.

[0051] Compared with the prior art, the beneficial effects of the present invention are:

[0052] An air conditioner power-saving control device includes: a microprocessor, a refrigerator, an air outlet device, and a thermostat; the microprocessor is connected to the refrigerator; the microprocessor is connected to the air outlet device; the microprocessor is connected to the thermostat; the microprocessor is used to set a temperature range and receive the real-time sensed temperature of the thermostat; when the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops running; wherein, the predetermined temperature is any temperature within the temperature range; when the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air to blow out the cold air in the refrigerator. The optimized air conditioner system reduces the start-stop times of the air conditioner main unit, and at the same time reduces the impact on the air conditioner equipment caused by the start of the main unit (the starting current is 4-7 times the normal working current), achieves a protection function for the air conditioner equipment, and the power-saving rate reaches 20%-40%. Description of the Drawings

[0053] Figure 1 It is a connection schematic diagram of an air conditioner power-saving control device.

[0054] Figure 2 It is a comparison chart of temperature and power of installing the air conditioner power-saving control device of the present application and not installing the air conditioner power-saving control device.

[0055] Figure 3 It is Experimental Data Table 1.

[0056] Figure 4 It is Experimental Data Table 2.

[0057] Figure 5 It is Experimental Data Table 3. Detailed Embodiments

[0058] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0059] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0060] Please refer to Figure 1 In an embodiment of the present invention, an air conditioner power-saving control device includes: a microprocessor, a refrigerator, an air outlet device, and a thermostat; the microprocessor is connected to the refrigerator; the microprocessor is connected to the air outlet device; the microprocessor is connected to the thermostat; the microprocessor is used to set a temperature range and receive the real-time sensed temperature of the thermostat; when the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops operating; wherein, the predetermined temperature is any temperature within the temperature range; when the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air to blow out the cold air in the refrigerator.

[0061] In this embodiment, referring to Figures 1 - 5 As shown: The intelligent split air conditioner power saver is an intelligent power-saving control device based on microcomputer technology. It adopts a microprocessor and compressor optimization control software to control the best operating time of the air conditioner compressor. The traditional room temperature control by keeping a constant point is optimized and calculated by the power saver and transformed into a control within a range of a plane, controlling the best start-stop time and the remaining cold evaporation time of the compressor. After the air conditioner compressor stops, the remaining cold is fully utilized, and the indoor fan continues to operate, slowly sending the cold air energy in the main unit and pipeline to the indoor for heat exchange, so that the room temperature is maintained within the range of a plane calculated by the power saver optimization software, improving the refrigeration efficiency. The optimized air conditioner system reduces the start-stop times of the air conditioner main unit, and at the same time reduces the impact on the air conditioner equipment caused by the start of the main unit (the start current is 4-7 times the normal working current), achieving a protection function for the air conditioner equipment, and the power saving rate reaches 20%-40%.

[0062] For example, install the energy-saving device of the present application in the air conditioner in the main engine room. The safe operating temperature of the air conditioner is 15-25 degrees; at this time, the aforementioned temperature range can be set to 10-20 degrees; when the thermostat detects that the temperature is 21 degrees, which is higher than the highest temperature of 20 degrees within the temperature range, at this time the microprocessor controls the compressor to work. The compressor works to gradually reduce the temperature from 21 degrees until the temperature drops to 10 degrees, and then the compressor stops working; afterwards, the microprocessor controls the air outlet device to continue working after the compressor stops operating, continuously blowing the remaining cold air in the compressor's air duct towards the main engine room to delay the rate of temperature rise in the main engine room, thereby extending the duration for the temperature in the main engine room to return to 21 degrees. In this way, the compressor shutdown time is extended, avoiding the waste of electric energy caused by repeated start-stop and extending the service life of the compressor.

[0063] In a specific embodiment, the cooler includes: a compressor and a main cooler pipeline; the microprocessor is controllably connected to the compressor; a compressor control algorithm is implanted in the microprocessor, and the microprocessor controls the compressor through the compressor control algorithm; the compressor control algorithm includes:

[0064] P = Kp×e(t); where Kp is the proportional gain and e(t) is the error (i.e., the difference between the target temperature and the actual temperature); proportional control is adjusted according to the current error (the difference between the target value and the actual value). The greater the error, the greater the adjustment force. The goal of proportional control is to rapidly reduce the error in a manner proportional to the error.

[0065] I = Ki×∫e(t)dt, where Ki is the integral gain and e(t) is the error; integral control is used to eliminate the long-term steady-state error. That is, when the system still cannot fully reach the target value after stable operation, integral control accumulates the error and eliminates this error by adjusting the control quantity.

[0066] D = Kd×(de(t) / dt), where Kd is the derivative gain and de(t) / dt is the rate of change of the error; derivative control adjusts the control output according to the rate of change of the error (i.e., the speed of change of the error). It predicts the future change of the error, thereby adjusting the output in advance to prevent the error from increasing too quickly.

[0067] u(t) = Kp·e(t) + Ki·∫e(t)dt + Kd·(de(t) / dt); where u(t) is the output of the controller (adjusting the power or speed of the compressor), and e(t) is the error (target value - current value).

[0068] The PID control algorithm (proportional-integral-derivative control) is a commonly used feedback control algorithm, widely used in various industrial control systems, including temperature control systems. Its core idea is to adjust the three parameters of proportional, integral, and derivative in real time to correct the output of the control system, so that the output of the system gradually approaches the target value.

[0069] In a specific embodiment, in the step where the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the cooler to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the cooler unloads and stops running. The microprocessor controls the start and stop of the compressor based on the PID algorithm; when the real-time sensed temperature is higher than the highest point of the temperature range, the current real-time sensed temperature is used as the current value; the predetermined temperature is used as the target value, the error e(t) is obtained; and the compressor is controlled to start using the PID algorithm until the real-time sensed temperature reaches the predetermined value, and then the compressor stops working.

[0070] In a temperature control system, such as devices like air conditioners and heaters, PID control maintains the indoor temperature close to the set target value by adjusting the power of the compressor or the working intensity of the heating element. When the error between the actual temperature and the target temperature increases, the PID controller reduces the error by adjusting the output of the system (such as changing the speed or current of the compressor), achieving stable temperature control.

[0071] In a specific embodiment, within a predetermined duration: the total heat discharged by the device at the installation location < the refrigerating capacity of the refrigerator;

[0072] Determine the refrigerating capacity of the refrigerator after operating for the predetermined duration;

[0073] Determine the heat generation of the host within the predetermined duration;

[0074] The calculation formula is as follows:

[0075] M + N = I + kS

[0076] Wherein, M is the refrigerating capacity, N is the refrigerating capacity for refrigerating to the predetermined temperature, I is the heat generation of the host, S is the ambient heat; K is the ambient temperature influence coefficient.

[0077] This can ensure that the heat is fully discharged.

[0078] In a specific embodiment, the air outlet device is a wind wheel; the temperature controller is a temperature sensor;

[0079] The power-saving control device is installed in the refrigerator of the electric control cabinet; the wind wheel is used at the cold air duct facing the compressor of the refrigerator, and the wind direction is towards the air outlet of the refrigerator;

[0080] A plurality of temperature sensors are arranged in the electric control cabinet; each of the temperature sensors is respectively connected to the microprocessor, and the real-time sensed temperature is the average value of the temperatures sensed by each of the temperature sensors.

[0081] In a specific embodiment, the compressor control algorithm further includes: a demand response control algorithm, including:

[0082] Data acquisition and monitoring: Deploy sensors to collect the operation data of the compressor in real time and obtain the grid load status according to the data of the State Grid;

[0083] Establish a DR strategy model: Establish a dynamic adjustment model of the compressor according to the load status, electricity price, and climate conditions;

[0084] Automation control system: Implement an automated control strategy to adjust the operation speed and time of the compressor through a frequency converter or an intelligent control system.

[0085] In a specific embodiment, the step of establishing a DR policy model: According to the load condition, electricity price, and climate condition, in the dynamic adjustment model of the compressor:

[0086] The energy consumption (E) of the compressor:

[0087] E = P(t)·Δt;

[0088] where, (P(t)) is the power consumption of the compressor at time (t), which is usually related to factors such as rotational speed and load; (Δt) is the time interval, usually in hours;

[0089] Electricity price model:

[0090] Cost(t) = E(t)·Price(t);

[0091] where, (Cost(t)) is the electricity cost of the compressor at time (t); (E(t)) is the energy consumption at this time;

[0092] Load demand model:

[0093] L(t) = f(T(t), G(t));

[0094] where, (L(t)) is the compressor load demand at time (t), (T(t)) is the external air temperature, and (G(t)) is the grid load;

[0095] When the electricity price is high or the grid load is large, control the compressor to reduce the rotational speed; during the period when the electricity price is low or the load is small, control the compressor to increase the rotational speed.

[0096] Using demand response control (DR) to adjust the operation time and speed of the compressor can not only help balance the grid load, reduce the pressure on power supply, but also improve the energy efficiency of the system and reduce the operating cost. By real-time monitoring the grid load and the operating status of equipment and adjusting through an intelligent control system, more efficient power management and energy-saving optimization can be achieved.

[0097] In a specific embodiment, the operating parameters of the microprocessor are as follows: Rated voltage: 220V - 380V; Power frequency voltage between power supply terminal and ground: AC 1.5 - 2.5 KV (220, 380) for 60 seconds at 50 MW; Impulse voltage: 6 KV without breakdown and without flashover; Insulation resistance between power supply terminal and ground: 50 MW↑ (DC 500V); Leakage power between power supply terminal and ground: AC 220, 380V 1 Ma↓; Overload: 2 times the rated current for 2 minutes; No-load loss: below 0.9%; No-load current: below 0.6%; Voltage and current waveform distortion rate: 0.

[0098] The air conditioner power-saving control device provided by this application can improve the system operation power factor and make full use of the surplus cold of the air conditioner, thereby improving the refrigeration efficiency; the power-saving rate is as high as 20% - 40%; it has full-automatic control, and once set, no manual operation or adjustment is required; it adopts a high-performance microcomputer control chip with stable and reliable performance; it has overvoltage, undervoltage protection, and delay protection; it adopts a delayed power-on method to protect the compressor and reduce the impact on the compressor caused by sudden power-off; its service life is up to more than ten years.

[0099] See Figure 3 As shown, when using the air conditioner power-saving control device of this application, during the working state of the air conditioner, using an ordinary electric meter to test, and testing for one hour respectively, it can be seen that the power-saving rate of the direct-saving part is as high as 20% - 45%.

[0100] For example, a 5P air conditioner consumes 5 degrees of electricity per hour, operates at full power for 24 hours a day, and the total power consumption is 120 degrees. The average power-saving efficiency of the power-saving device is 25%, so the daily power saving is 120 * 25% = 30 degrees. The average price of each degree of electricity is one yuan, so the daily electricity cost savings is 30 yuan. Calculated based on 30 days per month, the monthly electricity cost savings is 900 yuan.

[0101] A 3P air conditioner consumes 3 degrees of electricity per hour, operates at full power for 24 hours a day, and the total power consumption is 72 degrees. The average power-saving efficiency of the power-saving device is 25%, so the daily power saving is 72 * 25% = 18 degrees. The average price of each degree of electricity is one yuan, so the daily electricity cost savings is 18 yuan. Calculated based on 30 days per month, the monthly electricity cost savings is 540 yuan.

[0102] An air conditioner power-saving control method includes:

[0103] The user inputs a set temperature range to the microprocessor through the client;

[0104] The thermostat obtains the real-time sensed temperature and sends the real-time sensed temperature to the microprocessor;

[0105] The microprocessor compares the real-time sensed temperature with the temperature range:

[0106] When the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the cooler to operate for refrigeration until the cooler unloads and stops operating after the real-time sensed temperature is at a predetermined temperature; wherein, the predetermined temperature is any temperature within the temperature range;

[0107] After the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air for blowing out the cold air in the cooler.

[0108] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0109] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An air conditioner power-saving control device, characterized in that, Including: A microprocessor, a refrigerator, an air outlet device, and a temperature controller; The microprocessor is connected to the refrigerator; The microprocessor is connected to the air outlet device; The microprocessor is connected to the temperature controller; The microprocessor is used to set a temperature range and receive the real-time sensed temperature of the temperature controller; When the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops operating; wherein, the predetermined temperature is any temperature within the temperature range; When the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air to blow out the cold air in the refrigerator.

2. The air conditioner power saving control device according to claim 1, characterized in that The refrigerator includes: a compressor and a main refrigerator pipeline; the microprocessor is controllably connected to the compressor; A compressor control algorithm is implanted in the microprocessor, and the microprocessor controls the compressor through the compressor control algorithm; The compressor control algorithm includes: P = KpXe(t); where Kp is the proportional gain and e(t) is the error (i.e., the difference between the target temperature and the actual temperature); I = KiX∫e(t)dt, where Ki is the integral gain and e(t) is the error; D = KdX(de(t) / dt), where Kd is the derivative gain and de(t) / dt is the rate of change of the error; u(t) = Kp\cdote(t) + Ki\cdot\inte(t)dt + Kd\cdot\frac{de(t)}{dt}; where, u(t) is the output of the controller (adjusting the power or speed of the compressor), and e(t) is the error (target value - current value).

3. The air conditioner power saving control device according to claim 2, characterized in that, In the step that when the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops operating, the microprocessor controls the start and stop of the compressor based on the PID algorithm; When the real-time sensed temperature is higher than the highest point of the temperature range, use the current real-time sensed temperature as the current value; Use the predetermined temperature as the target value, obtain the error e(t); and use the PID algorithm to control the start of the compressor until the real-time sensed temperature reaches the predetermined value and then the compressor stops working.

4. The air conditioner power-saving control device according to claim 1, wherein, Within a predetermined time period: the total heat discharged by the equipment at the installation location < the refrigeration capacity of the refrigerator; Determine the refrigeration capacity of the refrigerator after operating for a predetermined time period; Determine the heat generation of the host within a predetermined time period; The calculation formula is as follows: M + N = I + kS Wherein, M is the refrigeration capacity, N is the refrigeration capacity for refrigerating to the predetermined temperature, I is the heat generation of the host, S is the environmental heat; K is the environmental temperature influence coefficient.

5. The air conditioner power-saving control device according to claim 1, characterized in that The air outlet device is a wind wheel; the temperature controller is a temperature sensor; The power-saving control device is installed in the refrigerator of the electric control cabinet; the wind wheel is used to face the cold air pipe of the refrigerator compressor, and the wind direction faces the air outlet of the refrigerator; A plurality of temperature sensors are arranged inside the electric control cabinet; each of the temperature sensors is respectively connected to the microprocessor, and the real-time sensed temperature is the average value of the temperatures sensed by each of the temperature sensors.

6. The air conditioner power-saving control device according to claim 1, characterized in that, The compressor control algorithm further includes: a demand response control algorithm, including: Data acquisition and monitoring: Deploy sensors to collect the operating data of the compressor in real time and obtain the grid load condition according to the State Grid data; Establish a DR strategy model: Establish a dynamic adjustment model of the compressor according to the load condition, electricity price, and climate condition; Automated control system: Implement an automated control strategy to adjust the operating speed and time of the compressor through an inverter or an intelligent control system.

7. The air conditioner power-saving control device according to claim 1, characterized in that Step of establishing a DR strategy model: In the step of establishing a dynamic adjustment model of the compressor according to the load condition, electricity price, and climate condition: Energy consumption (E) of the compressor: E = P(t)·Δt; where, (P(t)) is the power consumption of the compressor at time (t), which is usually related to factors such as rotational speed and load; (Δt) is the time interval, usually in hours; Electricity price model: Cost(t) = E(t)·Price(t); where, (Cost(t)) is the electricity cost of the compressor at time (t); (E(t)) is the energy consumption at this time; Load demand model: L(t) = f(T(t), G(t)); where, (L(t)) is the compressor load demand at time (t), (T(t)) is the external air temperature, and (G(t)) is the grid load; When the electricity price is high or the grid load is large, control the compressor to reduce its rotational speed; during the period when the electricity price is low or the load is small, control the compressor to increase its rotational speed.

8. The air conditioner power-saving control device according to claim 1, wherein, The operating parameters of the microprocessor are: rated voltage: 220V - 380V; between the power frequency voltage power supply terminal and the ground: AC1.5 - 2.5KV (220, 380) for 60 seconds at 50MW; impulse voltage 6KV without breakdown and without flashover; insulation resistance between the power supply terminal and the ground: 50MW↑ (DC 500V); leakage current between the power supply terminal and the ground: AC220, 380V 1 Ma↓; overload 2 times the rated current for 2 minutes; no-load loss: below 0.9%; No-load current: below 0.6%; voltage and current waveform distortion rate:

0.

9. The air conditioner power-saving control method according to claim 1, characterized in that Including: The user inputs a set temperature range to the microprocessor through the client; The thermostat acquires the real-time sensed temperature and sends the real-time sensed temperature to the microprocessor; The microprocessor compares the real-time sensed temperature with the temperature range: When the real-time sensed temperature is higher than the highest point of the temperature range, the microprocessor controls the refrigerator to operate for refrigeration until the real-time sensed temperature reaches a predetermined temperature and then the refrigerator unloads and stops running; where, the predetermined temperature is any temperature within the temperature range; When the real-time sensed temperature reaches the predetermined temperature, the microprocessor controls the air outlet device to continuously blow air to blow out the cold air in the refrigerator.

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