Adaptive working condition air conditioner fan coil intelligent control method

Abstract

The application discloses an air conditioner fan coil intelligent control method with self-adaptive working conditions, and the main design concept of the application is to provide a self-adaptive adjustment working mode combined with an actual temperature value and winter and summer temperature setting values, so that the workload of mode conversion setting in winter and summer can be effectively reduced, and the temperature control stability of the fan coil is improved. Specifically, temperature setting variables in summer and winter are respectively established and pre-assigned, in the actual control stage, intelligent judgment is carried out in combination with the actually collected temperature value and the given temperature hysteresis value, and the working mode of the air conditioner fan coil is self-adaptively adjusted based on the judgment result. In addition to realizing the self-adaptive adjustment of the fan coil mode in different seasons, the air speed compensation mechanism is further proposed, the original temperature difference control of the air conditioner fan is converted into the cold and heat control from the cold and heat sources, the response speed of the temperature control can be effectively improved, and the comfort degree of the air conditioner use is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning fan coil unit control technology, and in particular to an intelligent control method for air conditioning fan coil units that adapts to different operating conditions. Background Technology

[0002] Fan coil units, as part of the ducted split air conditioning or central air conditioning HVAC systems widely used in various buildings of tobacco companies, regulate the ambient temperature of the controlled area by connecting to cold and heat sources and regulating the temperature through heat exchange.

[0003] Fan coil units typically consist of cold or hot source piping, solenoid valves, a blower, a heat exchanger, a drip tray, and a control panel. The cold or hot source piping provides the cold or heat source, the solenoid valves control the on / off state of the piping, the blower circulates air in the room, and the heat exchanger, when the solenoid valve is on and the blower is running, completes the heat exchange between the cold or hot source and the air. The control panel usually integrates a temperature sensor and allows for user parameter settings. It has a built-in control program that, based on user-defined winter / summer modes and temperature setpoints, controls the on / off state of the solenoid valves and the blower speed, ultimately regulating the room temperature.

[0004] During the spring / summer and autumn / winter transitions, users need to manually switch between summer and winter modes to meet normal cooling or heating needs. Setting appropriate temperatures is crucial for energy conservation and emission reduction. For example, in summer, the cooling mode is set to 26℃, and in winter, the heating mode is set to 20℃. However, in the reality of tobacco companies, the number of fan coil units is large, resulting in a significant workload for parameter setting. Inappropriate parameter settings can lead to offsetting cooling and heating, ultimately wasting energy.

[0005] Furthermore, to ensure the cooling or heating effect of the fan coil unit, the fan speed is usually adjusted based on the difference between the set temperature and the actual temperature. For example, when the temperature difference is large, the fan speed is increased; when the temperature difference is small, the fan speed is decreased. However, when the energy quality of the cold or heat source changes, the drawbacks of this traditional control strategy become apparent. For instance, in cooling mode, with a normal water supply temperature of 7°C, if the temperature difference between the set temperature and the actual temperature is 2°C, the fan speed is set to level 2. However, if the water supply temperature rises to 10°C, the fan speed will still be controlled at level 2, further amplifying the difference between the set temperature and the actual temperature, thus reducing the comfort of using the air conditioner. Summary of the Invention

[0006] In view of the above, the present invention aims to provide an intelligent control method for air conditioning fan coil units that adapts to operating conditions, so as to solve the aforementioned technical problems.

[0007] The technical solution adopted in this invention is as follows:

[0008] This invention provides an intelligent control method for air conditioning fan coil units under adaptive operating conditions, including:

[0009] Establish separate temperature setting variables for summer and winter.

[0010] The system presets a first temperature setting value corresponding to the summer temperature setting variable and a second temperature setting value corresponding to the winter temperature setting variable, and assigns a temperature hysteresis value.

[0011] Real-time acquisition of measured temperature values ​​in the area affected by the air conditioner;

[0012] The first temperature setpoint, the second temperature setpoint, and the temperature hysteresis value are compared with the measured temperature value.

[0013] Based on the comparison results, the working mode of the air conditioning fan coil unit is adaptively adjusted.

[0014] In at least one of the possible implementations, the operating modes include: summer mode and winter mode.

[0015] In at least one possible implementation, the adaptive adjustment of the operating mode of the air conditioning fan coil unit based on the comparison results includes:

[0016] If the sum of the first temperature setpoint and the temperature hysteresis value is less than the measured temperature value, the fan coil unit's operating mode is switched to summer mode; if the difference between the second temperature setpoint and the temperature hysteresis value is greater than the measured temperature value, the fan coil unit's operating mode is switched to winter mode.

[0017] In at least one possible implementation, the adaptive adjustment of the operating mode of the air conditioning fan coil unit based on the comparison results further includes:

[0018] If the measured temperature value is between the sum of the first temperature setpoint and the temperature hysteresis value and the difference between the second temperature setpoint and the temperature hysteresis value, the fan coil unit's operating mode will remain unchanged.

[0019] In at least one possible implementation, the intelligent control method further includes:

[0020] Based on the current working mode, obtain the preset ideal value of energy quality index and the actual value of energy quality index.

[0021] The fan speed control command is obtained based on the difference between the temperature setpoint corresponding to the current working mode and the actual temperature value.

[0022] By combining the wind speed control command, the ideal value of the energy quality index, and the actual value of the energy quality index, the wind speed of the fan in the current working mode is compensated and controlled.

[0023] In at least one possible implementation, the compensatory control of the fan speed in the current operating mode includes the following:

[0024] When in summer mode, the wind speed control value used for wind speed compensation = the wind speed control command × actual value of cold source energy quality index ÷ ideal value of cold source energy quality index;

[0025] When in winter mode, the wind speed control value used for wind speed compensation = the wind speed control command × ideal value of heat source energy quality index ÷ actual value of heat source energy quality index.

[0026] In at least one of the possible implementations, the method of obtaining the wind speed control command includes at least one of the following:

[0027] By utilizing the preset mapping relationship between temperature difference and fan speed setting, the corresponding fan speed control value is obtained and used as the fan speed control command.

[0028] Based on preset air conditioner PID parameters, the wind speed control value is obtained according to the temperature difference and used as the wind speed control command.

[0029] Compared with existing technologies, the main design concept of this invention lies in providing an adaptive adjustment working mode that combines actual temperature values ​​with winter and summer temperature setpoints. This effectively reduces the workload of setting modes for winter and summer, while improving the temperature control stability of the fan coil unit. Specifically, summer and winter temperature setpoint variables are established and pre-assigned. During the actual control phase, intelligent judgment is made based on the actual temperature values ​​and the given temperature hysteresis value, and the working mode of the air conditioning fan coil unit is adaptively adjusted based on the judgment result. In addition to realizing the adaptive adjustment of the fan coil unit to different seasonal modes, this invention further proposes a wind speed compensation mechanism, converting the original temperature difference control of the air conditioning fan into heat and cold source control, which can effectively improve the response speed of temperature control and thus enhance the comfort of air conditioning use. Attached Figure Description

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0031] Figure 1 A flowchart illustrating the intelligent control method for air conditioning fan coil units under adaptive operating conditions provided in this embodiment of the invention. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] This invention proposes an embodiment of an adaptive intelligent control method for air conditioning fan coil units, specifically, as follows: Figure 1 As shown, it includes:

[0034] Step S1: Establish summer temperature setting variables and winter temperature setting variables respectively;

[0035] Step S2: Preset the first temperature setting value corresponding to the summer temperature setting variable and the second temperature setting value corresponding to the winter temperature setting variable, and give the temperature hysteresis value;

[0036] Step S3: Real-time acquisition of measured temperature values ​​in the area affected by the air conditioner;

[0037] Step S4: Combine the first temperature setpoint, the second temperature setpoint, and the temperature hysteresis value with the measured temperature value;

[0038] Step S5: Based on the comparison results, adaptively adjust the working mode of the air conditioning fan coil unit.

[0039] Understandably, the modes preferably defined in this invention include a summer mode and a winter mode.

[0040] Regarding the approach mentioned in step S5 of automatically adjusting the working mode based on the comparison results, the following can be referenced:

[0041] One type is: if the sum of the first temperature setpoint and the temperature hysteresis value is less than the measured temperature value, the fan coil unit's operating mode is switched to summer mode; if the difference between the second temperature setpoint and the temperature hysteresis value is greater than the measured temperature value, the fan coil unit's operating mode is switched to winter mode.

[0042] Another type is: if the measured temperature value is between the sum of the first temperature setpoint and the temperature hysteresis value and the difference between the second temperature setpoint and the temperature hysteresis value, then the working mode of the fan coil unit remains unchanged.

[0043] Based on the above, let the winter temperature setpoint be T. winter-set The summer temperature setting is T. summer-set The actual temperature is T, the temperature hysteresis is ΔT, and the fan coil unit's winter / summer mode is MOD. Therefore:

[0044] Mod switched to Summer Mode T>Tsummer-set +ΔT (1)

[0045] MOD remains unchanged. winter-set -ΔT≤T≤T summer-set +ΔT (2)

[0046] Mod switched to Winter Mode T < T winter - set -ΔT (3)

[0047] In practice, by using the above control logic scheme and combining it with a reasonable temperature hysteresis ΔT given in advance by experts, the adaptive adjustment of the fan coil unit's winter and summer modes can be achieved, thereby completely eliminating the workload of manually switching modes in different seasons.

[0048] Furthermore, the intelligent control method can also combine the energy quality of the cold and heat sources, the temperature setpoint, and the actual temperature measurement to optimize the airflow control of the fan coil unit, so as to improve the cooling or heating speed.

[0049] Specifically, this optimization concept includes:

[0050] Based on the current working mode, obtain the preset ideal value of energy quality index and the actual value of energy quality index.

[0051] The fan speed control command is obtained based on the difference between the temperature setpoint corresponding to the current working mode and the actual temperature value.

[0052] By combining the wind speed control command, the ideal value of the energy quality index, and the actual value of the energy quality index, the wind speed of the fan in the current working mode is compensated and controlled.

[0053] The compensation control of the fan speed in the current operating mode can be further explained as follows:

[0054] (1) When in summer mode, the wind speed control value used for wind speed compensation = the wind speed control command × the actual value of the cold source energy quality index ÷ the ideal value of the cold source energy quality index;

[0055] (2) When in winter mode, the wind speed control value used for wind speed compensation = the wind speed control command × ideal value of heat source energy quality index ÷ actual value of heat source energy quality index.

[0056] Specifically, let the ideal energy grade of the cold source be T. cool-e The actual energy grade of the cold source is T. cool The ideal energy grade of the heat source is T. heat-e The actual energy grade of the heat source is T. heatThe blower's speed control command, calculated based on the difference between the actual temperature and the set temperature, is V. T-command If the final blower speed control value is V, then:

[0057] V = V T-command ×T cool ÷T cool-e When the MOD is set to Summer Mode (4)

[0058] V = V T-command ×T heat-e ÷T heat When the MOD is set to Winter Mode (5)

[0059] In practice, by using the aforementioned wind speed compensation control mechanism, the original temperature difference control of the fan can be converted into cooling and heating control, which can effectively improve the response speed of temperature control and thus improve the comfort of air conditioning use.

[0060] Finally, it should be added that the methods for obtaining wind speed control commands from the wind turbine mentioned above can include at least one of the following two methods:

[0061] Firstly, by utilizing the preset mapping relationship between the temperature difference (the deviation between the set value and the measured value) and the fan speed setting, the corresponding fan speed control value is obtained and used as the fan speed control command.

[0062] Secondly, based on the preset air conditioning temperature control PID parameters, the wind speed control value is obtained according to the temperature difference, and used as the wind speed control command.

[0063] In summary, the main design concept of this invention lies in providing an adaptive adjustment working mode that combines actual temperature values ​​with winter and summer temperature setpoints. This effectively reduces the workload of setting modes for winter and summer, while improving the temperature control stability of the fan coil unit. Specifically, summer and winter temperature setpoint variables are established and pre-assigned. During the actual control phase, intelligent judgment is made based on the actual temperature values ​​and the given temperature hysteresis value, and the working mode of the air conditioning fan coil unit is adaptively adjusted based on the judgment result. In addition to realizing the adaptive adjustment of the fan coil unit to different seasonal modes, this invention further proposes a wind speed compensation mechanism, converting the original temperature difference control of the air conditioning fan into heat and cold source control, which can effectively improve the response speed of temperature control and thus enhance the comfort of air conditioning use.

[0064] In this invention, when directional terms are mentioned, they are relative concepts based on the embodiments. Furthermore, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0065] The above description of the structure, features, and effects of the present invention is based on the embodiments shown in the figures. However, the above are only preferred embodiments of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched by those skilled in the art to form a variety of equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. An intelligent control method for air conditioning fan coil units under adaptive operating conditions, characterized in that, include: Establish separate temperature setting variables for summer and winter. The system presets a first temperature setting value corresponding to the summer temperature setting variable and a second temperature setting value corresponding to the winter temperature setting variable, and assigns a temperature hysteresis value. Real-time acquisition of measured temperature values ​​in the area affected by the air conditioner; The first temperature setpoint, the second temperature setpoint, and the temperature hysteresis value are compared with the measured temperature value. Based on the comparison results, the working mode of the air conditioning fan coil unit is adaptively adjusted.

2. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to claim 1, characterized in that, The operating modes include: summer mode and winter mode.

3. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to claim 2, characterized in that, The adaptive adjustment of the air conditioning fan coil unit's operating mode based on the comparison results includes: If the sum of the first temperature setpoint and the temperature hysteresis value is less than the measured temperature value, the fan coil unit's operating mode is switched to summer mode; if the difference between the second temperature setpoint and the temperature hysteresis value is greater than the measured temperature value, the fan coil unit's operating mode is switched to winter mode.

4. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to claim 3, characterized in that, The adaptive adjustment of the air conditioning fan coil unit's operating mode based on the comparison results also includes: If the measured temperature value is between the sum of the first temperature setpoint and the temperature hysteresis value and the difference between the second temperature setpoint and the temperature hysteresis value, the fan coil unit's operating mode will remain unchanged.

5. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to any one of claims 2 to 4, characterized in that, The intelligent control method further includes: Based on the current working mode, obtain the preset ideal value of energy quality index and the actual value of energy quality index. The fan speed control command is obtained based on the difference between the temperature setpoint corresponding to the current working mode and the actual temperature value. By combining the wind speed control command, the ideal value of the energy quality index, and the actual value of the energy quality index, the wind speed of the fan in the current working mode is compensated and controlled.

6. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to claim 5, characterized in that, The compensation control of the fan speed under the current operating mode includes the following: When in summer mode, the wind speed control value used for wind speed compensation = the wind speed control command × actual value of cold source energy quality index ÷ ideal value of cold source energy quality index; When in winter mode, the wind speed control value used for wind speed compensation = the wind speed control command × ideal value of heat source energy quality index ÷ actual value of heat source energy quality index.

7. The intelligent control method for air conditioning fan coil units under adaptive operating conditions according to claim 5, characterized in that, The method of obtaining the wind speed control command includes at least one of the following: By utilizing the preset mapping relationship between temperature difference and fan speed setting, the corresponding fan speed control value is obtained and used as the fan speed control command. Based on preset air conditioner PID parameters, the wind speed control value is obtained according to the temperature difference and used as the wind speed control command.

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