An energy-saving control method of a fresh air system, an electronic device, and a storage medium

Abstract

The application discloses an energy-saving control method of a fresh air system, an electronic device and a storage medium, and relates to the technical field of fresh air system energy saving, wherein the method comprises periodically collecting indoor and outdoor environment state data and device state data of the fresh air system, associating the indoor and outdoor environment state data with the device state data according to a sampling time, obtaining a running state data sequence, and dividing and constructing a wind reduction event section and a wind supply event section from the running state data sequence. The application generates differentiated fresh air system control instructions based on a high-humidity source determination result, maintains necessary ventilation when internal moisture release is dominant, and executes enhanced wind supply after the outdoor dew point meets a preset low-humidity condition. Necessary ventilation is maintained and enhanced wind supply is limited when external air moisture is dominant. When mixed sources are present, exploratory wind supply is executed and the high-humidity source is re-determined. Thus, repeated moisture carrying and repeated compensation dehumidification caused by control direction errors are reduced, and the energy-saving performance of the fresh air system operation is improved.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology for fresh air systems, and in particular to an energy-saving control method, electronic device, and storage medium for a fresh air system. Background Technology

[0002] With the increasing demands for airtightness in buildings and the rising requirements for air quality in residential, office, and educational settings, relying solely on window and door penetration or natural ventilation is no longer sufficient to reliably meet indoor fresh air needs. Mechanical fresh air systems are gradually becoming an important feature of modern building ventilation, especially in ultra-low energy buildings, fully furnished residences, schools, hospitals, and office buildings. Existing ventilation design standards typically require maintaining acceptable indoor air quality by introducing outdoor air and expelling stale indoor air, and specify minimum ventilation volumes.

[0003] In existing technologies, fresh air systems typically include supply fans, exhaust fans, filtration units, heat exchange units, dampers, and sensors for collecting indoor and outdoor parameters. To balance air quality and energy consumption, the industry has developed an energy-saving control approach exemplified by demand-driven ventilation. This involves adjusting parameters such as fresh air volume, fan speed, and damper opening based on indoor carbon dioxide concentration, temperature, relative humidity, particulate matter concentration, or preset time periods. When indoor occupancy density or pollutant concentration is low, the fresh air volume is reduced to decrease the heating and cooling load caused by excessive ventilation; when indoor air quality deteriorates, the fresh air volume is increased to improve air quality. Related research and reviews generally agree that this control method can reduce energy loss caused by over-ventilation under certain conditions, and therefore has become a common solution for energy-saving control of fresh air systems.

[0004] Existing fresh air systems typically implement responsive control based on instantaneous detection values ​​of indoor relative humidity, dew point, carbon dioxide concentration, or occupancy status. Their control inputs can only characterize the current indoor air humidity state, not the source of that humidity level. Meanwhile, building envelopes, decorative materials, furniture fabrics, and bathroom fixtures, among other indoor moisture absorbers, exhibit significant moisture buffering and delayed moisture release characteristics. This means that the internal moisture released after ventilation stops or at low airflow rates, along with the external moisture continuously brought in by the fresh air intake from high-humidity outdoor air, can both manifest as an increase in indoor relative humidity or dew point at the instantaneous detection level.

[0005] Because existing systems typically do not perform event-level analysis on the dew point recovery trajectory after ventilation shutdown, the dew point following trajectory after increased air supply, and the correspondence between carbon dioxide decline and moisture changes, it is difficult to determine whether the current high humidity process is dominated by external air carrying humidity or internal moisture release. Consequently, the system easily confuses two types of high humidity processes with different mechanisms but similar apparent results: when external air carrying humidity is dominant, the fresh air volume is further increased to introduce more humid air; when internal moisture release is dominant, the system fails to utilize low-humidity windows to dissipate indoor moisture in a timely manner, ultimately leading to incorrect control actions, repeated humidification, and repeated dehumidification compensation. While existing research and engineering practices generally focus on multi-input control based on CO2, humidity, and occupancy, they do not consider "humidity source identification" as a fundamental aspect of conventional fresh air energy-saving control. Therefore, how to identify the source of the current high humidity process during the energy-saving control of fresh air systems and implement differentiated control for the two different mechanisms of external air carrying humidity and internal moisture release has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving control method, electronic device, and storage medium for a fresh air system to solve the above-mentioned technical problems.

[0007] To solve one or more of the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] Firstly, an energy-saving control method for a fresh air system includes the following steps:

[0009] S1. Periodically collect indoor and outdoor environmental status data and fresh air system equipment status data, and associate the indoor and outdoor environmental status data and the equipment status data according to the sampling time to obtain an operating status data sequence. From the operating status data sequence, divide and construct the wind reduction event segment and the air supply event segment.

[0010] S2. Based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the wind reduction event segment, construct the internal moisture release hypothesis trajectory; and based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the air supply event segment, construct the external air moisture carryover hypothesis trajectory.

[0011] S3. Based on the assumed trajectory of internal moisture release and the assumed trajectory of external air moisture carryover, calculate the deviation of internal moisture release and the deviation of external air moisture carryover, respectively.

[0012] S4. Determine the source of high humidity based on the deviation of internal moisture release and the deviation of external air moisture carryover.

[0013] S5. Generate fresh air system control instructions based on the high humidity source determination results.

[0014] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, the process of constructing the air reduction event segment includes:

[0015] Compare the device status data at adjacent sampling times in the operating status data sequence;

[0016] When the air supply capacity of the fresh air system is detected to change from a high value to a low value, and the change range reaches the air reduction judgment condition, the corresponding change time is marked as the air reduction start time. Taking the air reduction start time as the center, a data segment of a preset base time is extracted forward from the operation status data sequence, and a data segment of a preset response time is extracted backward. The segments are combined to construct the air reduction event segment.

[0017] The process of constructing the air supply event segment includes:

[0018] When the air supply capacity of the fresh air system is detected to change from a low value to a high value, and the change range reaches the air supply judgment condition, the corresponding change time is marked as the air supply start time. Taking the air supply start time as the center, data segments of a preset base time are extracted forward and data segments of a preset response time are extracted backward from the operation status data sequence, and combined to construct the air supply event segment.

[0019] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, the process of constructing the internal moisture release hypothesis trajectory specifically includes:

[0020] Extract the initial indoor dew point, indoor air state parameters, and equipment state parameters before and after the air reduction start time;

[0021] Since the fresh air system is in a restricted ventilation state after the air reduction, the current high humidity process is assumed to be mainly driven by the delayed release of moisture from the indoor moisture storage body;

[0022] The indoor dew point at the start of the wind reduction is used as the initial value, the indoor equilibrium dew point is used as the release target, and the internal moisture release time constant is used as the release rate parameter. The indoor dew point change value at each subsequent moment in the wind reduction event period is deduced by sampling cycle to construct the internal moisture release hypothesis trajectory.

[0023] The process of constructing the hypothetical trajectory of external air carrying moisture specifically includes:

[0024] Extract the indoor dew point, outdoor dew point, fresh air volume change, and equipment status parameters before and after air supply at the start of the air supply.

[0025] Based on the enhanced air supply, outdoor air is actively introduced into the room, and the current high humidity process is assumed to be mainly driven by the input of outdoor humid air;

[0026] The indoor dew point at the start of the air supply is used as the initial value, the difference between indoor and outdoor dew points is used as the input driving force, the air supply enhancement amplitude is used as the input intensity correction, and the external air input time constant is used as the transmission speed parameter. The indoor dew point change value at each subsequent moment in the air supply event segment is deduced on a sampling cycle basis to construct the hypothetical trajectory of external air carrying moisture.

[0027] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, the calculation process of the internal moisture release deviation includes:

[0028] Within the first preset comparison window, the absolute value of the difference between the actual indoor dew point value and the internal moisture release hypothesis dew point value at the corresponding time of the internal moisture release hypothesis trajectory is calculated at each sampling time. The absolute value of the difference is then weighted and accumulated based on the first comparison weight corresponding to each sampling time to obtain the internal moisture release deviation.

[0029] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, it further includes:

[0030] The calculation process for the external air moisture deviation includes:

[0031] Within the second preset comparison window, the absolute value of the difference between the actual indoor dew point value and the assumed outdoor dew point value with humidity at each sampling time is calculated. The absolute value of the difference is then weighted and accumulated based on the second comparison weight corresponding to each sampling time to obtain the outdoor humidity deviation.

[0032] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, the process of determining the high humidity source includes:

[0033] A high humidity source determination factor is constructed based on the deviation of internal moisture release and the deviation of external air moisture.

[0034] The first and second judgment thresholds are obtained by calibrating the deviation results of the real indoor dew point trajectory in the historical event samples from the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory, respectively.

[0035] When the internal moisture release deviation is less than the external air moisture deviation, the high humidity source determination factor is positive; when the external air moisture deviation is less than the internal moisture release deviation, the high humidity source determination factor is negative; when the internal moisture release deviation is equal to the external air moisture deviation, the high humidity source determination factor is zero.

[0036] When the high humidity source determination factor is greater than or equal to the first determination threshold, it is determined to be a high humidity source dominated by internal moisture release; when the high humidity source determination factor is less than or equal to the negative number of the second determination threshold, it is determined to be a high humidity source dominated by external air moisture; when the high humidity source determination factor is between the negative numbers of the first and second determination thresholds, it is determined to be a high humidity source with mixed sources.

[0037] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, the step of generating fresh air system control commands based on the high humidity source determination result includes:

[0038] When the source of high humidity is determined to be internal moisture release, the fresh air system maintains the necessary ventilation volume and continues to monitor changes in the outdoor dew point. Once the outdoor dew point meets the preset low humidity condition, the air supply will then be activated.

[0039] When the source of high humidity is determined to be mainly external air humidity, the fresh air system should maintain the necessary ventilation volume and limit the air supply.

[0040] When the source of high humidity is determined to be a mixed source, the fresh air system performs trial air supply, then re-collects the real dew point trajectory in several subsequent sampling periods, recalculates the deviation of the dual hypotheses, and re-determines the source of high humidity to decide whether to switch to internal moisture release-dominated control or external air moisture-dominated control.

[0041] As a preferred embodiment of the energy-saving control method for a fresh air system according to the present invention, after generating the fresh air system control command, the method further includes: correcting the trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory, including:

[0042] The trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory include at least the indoor equilibrium dew point and the internal moisture release time constant. The indoor equilibrium dew point is constructed based on the average indoor dew point and the trend of indoor temperature and humidity changes in several sampling periods before the start of the wind reduction event. The internal moisture release time constant is fitted based on the duration and stabilization time of the actual dew point recovery process in the historical wind reduction event samples.

[0043] The trajectory construction parameters corresponding to the assumed trajectory of humid outside air include at least the outside air input time constant, the reference fresh air volume, and the basic parameters corresponding to the air supply enhancement amplitude correction. The outside air input time constant is obtained by fitting the response time of the indoor dew point after air supply enhancement in historical air supply event samples. The reference fresh air volume is constructed based on the average equivalent fresh air volume during the normal operation phase of the system or the rated operating parameters of the equipment. The basic parameters corresponding to the air supply enhancement amplitude correction are constructed based on the change amplitude of the equivalent fresh air volume in the current air supply event period.

[0044] Secondly, this application provides an electronic device, comprising:

[0045] Processor; and

[0046] A memory storing program instructions that, when executed by the processor, cause the electronic device to implement the method disclosed in the first aspect.

[0047] Thirdly, this application provides a storage medium that is a computer-readable storage medium storing computer-readable instructions thereon, which, when executed by one or more processors, implement the method disclosed in the first aspect above.

[0048] The beneficial effects of this invention are:

[0049] This invention does not uniformly adjust the fresh air volume based solely on instantaneous detection values ​​of indoor relative humidity, dew point, or carbon dioxide concentration. Instead, it divides the airflow reduction event into a period of air supply and a period of air supply, constructing hypothetical trajectories for internal moisture release and external air moisture carryover. The source of high humidity is determined based on the deviation of the actual dew point trajectory from both hypothetical trajectories, thus distinguishing whether the current high humidity process is dominated by the delayed release of moisture from indoor moisture storage devices or by the input of humid outdoor air. This solves the problems of existing technologies that struggle to distinguish different sources of high humidity and easily confuse external air moisture carryover with internal moisture release, improving the accuracy of high humidity source determination. Meanwhile, the present invention can further generate differentiated fresh air system control commands based on the high humidity source determination results. When internal moisture release is dominant, necessary ventilation is maintained and enhanced air supply is executed after the outdoor dew point meets the preset low humidity condition. When external air moisture is dominant, necessary ventilation is maintained and enhanced air supply is limited. When mixed sources are present, trial air supply is executed and the high humidity source is re-determined. This reduces repeated moisture retention and repeated dehumidification caused by incorrect control direction, thereby improving the energy efficiency, stability and adaptability of the fresh air system. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0051] Figure 1 This is a flowchart illustrating the energy-saving control method for the fresh air system in this embodiment. Detailed Implementation

[0052] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0053] like Figure 1 As shown, this embodiment provides an energy-saving control method for a fresh air system. In scenarios where indoor high humidity processes may be simultaneously affected by the delayed release of moisture from indoor moisture storage bodies and the input of outdoor humid air, the method determines the current source of high humidity and generates corresponding control commands for the fresh air system based on the determination results. This avoids the problems of incorrect control direction, repeated humidification, and repeated compensation dehumidification caused by mixing high humidity processes from different sources in the prior art.

[0054] In this embodiment, the method includes the following steps.

[0055] S1. Periodically collect indoor and outdoor environmental status data and fresh air system equipment status data, and associate the indoor and outdoor environmental status data with the equipment status data according to the sampling time to obtain an operating status data sequence; identify the air reduction start time and air supply start time based on the equipment status data in the operating status data sequence, and divide and construct the air reduction event segment and air supply event segment from the operating status data sequence based on the air reduction start time and air supply start time;

[0056] The controller periodically collects indoor and outdoor environmental status data and equipment status data of the fresh air system according to a fixed sampling period, and obtains the original operating data sequence arranged in chronological order.

[0057] The indoor and outdoor environmental status data include indoor temperature, indoor relative humidity, indoor carbon dioxide concentration, outdoor temperature, and outdoor relative humidity; the equipment status data of the fresh air system includes at least one of the following: supply fan frequency, exhaust fan frequency, fresh air valve opening degree, and equivalent fresh air volume.

[0058] In this embodiment, the sampling period is set to 2 minutes.

[0059] The indoor temperature and relative humidity were converted to obtain the indoor dew point sequence; the outdoor temperature and relative humidity were converted to obtain the outdoor dew point sequence.

[0060] Based on the equipment status data of the fresh air system, the air supply capacity is compared between adjacent sampling times.

[0061] When it is detected that the air supply capacity changes from a high value to a low value at the current sampling time relative to the previous sampling time, and the change range reaches the air reduction judgment condition, the corresponding change time is marked as the air reduction start time; when it is detected that the air supply capacity changes from a low value to a high value at the current sampling time relative to the previous sampling time, and the change range reaches the air supply judgment condition, the corresponding change time is marked as the air supply start time.

[0062] In this embodiment, the air supply capacity is characterized by a combination of equivalent fresh air volume and fan frequency. When the equivalent fresh air volume decreases by more than 15% of the previous sampling time, or the fan frequency decreases by more than 5 Hz, the air reduction judgment condition is met. When the equivalent fresh air volume increases by more than 15% of the previous sampling time, or the fan frequency increases by more than 5 Hz, the air supply judgment condition is met.

[0063] After determining the start time of wind reduction, data segments of a preset base duration are extracted forward from the start time of wind reduction, and data segments of a preset response duration are extracted backward. These segments are then combined to construct the wind reduction event segment.

[0064] After determining the start time of air supply, data segments of a preset reference duration are extracted forward from the start time of air supply, and data segments of a preset response duration are extracted backward. These are then combined to construct the air supply event segment.

[0065] In this embodiment, the reference segment of the wind reduction event segment takes the three sampling periods before the start of wind reduction, and the response segment takes the eight sampling periods after the start of wind reduction; the reference segment of the air supply event segment takes the three sampling periods before the start of air supply, and the response segment takes the five sampling periods after the start of air supply.

[0066] For similar events with a time interval of less than 2 sampling periods, they are merged; for instantaneous fluctuations that last only 1 sampling period and then recover, they are discarded as jitter signals.

[0067] In this embodiment, a room in the dormitory building experienced a wind reduction event at 22:40. Specifically:

[0068] At 22:38, the equivalent fresh air volume was 620 m³ / h and the fan frequency was 38 Hz.

[0069] At 22:40, the equivalent fresh air volume decreased to 420m³ / h and the frequency of the air supply fan decreased to 30Hz, meeting the conditions for reducing air volume. Therefore, 22:40 was marked as the start time of reducing air volume.

[0070] Therefore, the baseline segment data from 22:34 to 22:40 and the response segment data from 22:40 to 22:56 are extracted to construct the corresponding wind reduction event segment.

[0071] During the same operation, the system experienced an air supply enhancement event at 23:06. Specifically:

[0072] At 23:04, the equivalent fresh air volume is 420m³ / h and the fan frequency is 30Hz.

[0073] At 23:06, the equivalent fresh air volume increased to 710 m³ / h and the frequency of the air supply fan increased to 40 Hz, meeting the air supply judgment conditions. Therefore, 23:06 was marked as the start time of air supply.

[0074] Therefore, the baseline segment data from 23:00 to 23:06 and the response segment data from 23:06 to 23:16 are extracted to construct the corresponding air supply event segment.

[0075] S2. Based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the wind reduction event segment, construct the internal moisture release hypothesis trajectory; and based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the air supply event segment, construct the external air moisture carryover hypothesis trajectory.

[0076] Construct the internal moisture release hypothesis trajectory corresponding to the wind reduction event segment.

[0077] For the air reduction event segment, the initial indoor dew point, indoor air state parameters, and equipment state parameters before and after air reduction are extracted at the start of air reduction. Based on the fact that the fresh air system is in a restricted ventilation state after air reduction, it is assumed that the current high humidity process is mainly driven by the delayed release of moisture from the indoor moisture storage body.

[0078] In this embodiment, the indoor moisture storage body includes the enclosure structure, furniture fabrics, bedding, and residual wet film on the bathroom surface.

[0079] Based on this, the indoor dew point at the start of the wind reduction is taken as the initial value, the indoor equilibrium dew point is taken as the release target, and the internal moisture release time constant is taken as the release rate parameter. The indoor dew point change value at each subsequent moment in the wind reduction event period is deduced by sampling cycle, and the internal moisture release hypothesis trajectory is constructed.

[0080] In this embodiment, the internal moisture release hypothesis trajectory is determined as follows:

[0081] ,

[0082] in, Indicates the first The assumed dew point value for internal moisture release at any given time; Indicates the indoor dew point at the moment the ventilation reduction begins; Indicates the indoor equilibrium dew point; This indicates the cumulative response time since the start of the wind reduction. This represents the internal moisture release time constant.

[0083] The indoor equilibrium dew point was constructed based on the average indoor dew point and the trend of indoor temperature and humidity changes in several sampling periods before the start of the wind reduction event. The internal moisture release time constant was obtained by fitting the duration and stabilization time of the actual dew point recovery process in historical wind reduction event samples.

[0084] In this embodiment, for the 22:40 wind reduction event segment, the indoor dew point at the start of the wind reduction is 18.5℃. Based on the previous operation samples of the room, the indoor equilibrium dew point is determined to be 17.9℃, and the internal moisture release time constant is 11min.

[0085] Based on this, starting from 22:40, the internal moisture release assumption dew point values ​​at each time point (22:42, 22:44, 22:46, 22:48, 22:50, 22:52, 22:54, 22:56) are deduced point by point, and the internal moisture release assumption trajectory corresponding to this wind reduction event segment is constructed.

[0086] Construct the hypothetical trajectory of external air with moisture corresponding to the air supply event segment.

[0087] For the air supply event segment, the indoor dew point, outdoor dew point, fresh air volume change range, and equipment status parameters before and after air supply are extracted at the start of air supply. Based on the fact that outdoor air is actively introduced into the room after air supply enhancement, it is assumed that the current high humidity process is mainly driven by the input of outdoor humid air.

[0088] Based on this, the indoor dew point at the start of the air supply is used as the initial value, the difference between indoor and outdoor dew points is used as the input driving force, the air supply enhancement amplitude is used as the input intensity correction amount, and the external air input time constant is used as the transmission speed parameter. The indoor dew point change value at each subsequent moment in the air supply event segment is deduced on a sampling cycle basis, and the external air humidification hypothesis trajectory is constructed.

[0089] In this embodiment, the assumed trajectory of the external air carrying moisture is determined as follows:

[0090] ,

[0091] Among them, the correction amount of air supply enhancement Determine as follows:

[0092] ,

[0093] in, Indicates the first The assumed dew point value of the ambient air at that moment; Indoor dew point indicating the moment air supply begins; The outdoor dew point indicating the moment when air supply begins; This represents the equivalent fresh air volume at the current moment; This indicates the equivalent fresh air volume at the previous moment; This indicates the reference fresh air volume; Indicates the external air input time constant; This represents a very small constant.

[0094] Among them, the external air input time constant is obtained by fitting the response time of indoor dew point after air supply enhancement in historical air supply event samples; the reference fresh air volume is constructed based on the average equivalent fresh air volume during normal system operation or the rated operating parameters of the equipment.

[0095] In this embodiment, for the air supply event segment at 23:06, the indoor dew point at the start of the air supply is 19.2℃, the outdoor dew point is 17.8℃, the equivalent fresh air volume at the previous moment is 420m³ / h, the equivalent fresh air volume at the current moment is 710m³ / h, the reference fresh air volume is 500m³ / h, and the outdoor air input time constant is 4min.

[0096] Based on this, starting from 23:06, the assumed dew point values ​​of the external air with moisture at each time point (23:08, 23:10, 23:12, 23:14, 23:16) are deduced point by point, and the assumed trajectory of the external air with moisture corresponding to this air supply event segment is constructed.

[0097] S3. Based on the assumed trajectory of internal moisture release and the assumed trajectory of external air moisture carryover, calculate the deviation of internal moisture release and the deviation of external air moisture carryover, respectively.

[0098] S4. Determine the source of high humidity based on the deviation of internal moisture release and the deviation of external air moisture carryover.

[0099] After constructing the internal moisture release hypothesis trajectory and the external air moisture carry hypothesis trajectory, the actual indoor dew point change trajectory that is time-aligned with the two hypothesis trajectories is extracted, and the internal moisture release deviation of the actual trajectory relative to the internal moisture release hypothesis trajectory and the external air moisture carry hypothesis trajectory are calculated respectively.

[0100] In this embodiment, the internal moisture release deviation is determined as follows:

[0101] ,

[0102] The deviation of external air moisture content is determined as follows:

[0103] ,

[0104] in, Indicates the deviation of internal moisture release; Indicates the deviation of external air moisture content; Indicates the length of the comparison window; Indicates the first The comparison weights of each sampling point.

[0105] In this embodiment, the comparison window length is 6 sampling periods for the wind reduction event segment and 5 sampling periods for the air supply event segment.

[0106] In the wind reduction event segment, the comparison weight of the last 3 sampling points is higher than that of the first segment; in the air supply event segment, the comparison weight of the first 2 sampling points is higher than that of the last segment.

[0107] Based on this, a high humidity source determination factor is constructed based on the deviation of internal moisture release and the deviation of external air moisture:

[0108] ,

[0109] in, This indicates the factor for determining the source of high humidity.

[0110] In this embodiment, the deviation of the real indoor dew point trajectory from the two hypothetical trajectories in the historical event samples is used for calibration, and the first and second judgment thresholds are both 0.20.

[0111] When the internal moisture release deviation is less than the external air moisture deviation, the high humidity source determination factor is positive.

[0112] When the deviation of external humidity is less than the deviation of internal humidity release, the high humidity source determination factor is negative.

[0113] When the two are equal, the determination factor for the source of high humidity is 0.

[0114] Furthermore:

[0115] When the high humidity source determination factor is greater than or equal to 0.20, the result is determined to be a high humidity source dominated by internal moisture release.

[0116] When the high humidity source determination factor is less than or equal to -0.20, the result is determined to be a high humidity source dominated by external air humidity.

[0117] When the high humidity source determination factor is between -0.20 and 0.20, the high humidity source determination result is determined to be a mixed source.

[0118] In this embodiment, for the wind reduction event segment at 22:40 in the dormitory building, the following calculations were performed:

[0119] Internal moisture release deviation =0.42;

[0120] External air moisture deviation =1.15.

[0121] Therefore, it can be seen that the internal moisture release deviation is significantly less than the external air moisture deviation. Thus, the high humidity source determination factor is positive and greater than the first determination threshold. Therefore, the current high humidity source determination result is determined to be dominated by internal moisture release.

[0122] For the air supply event segment at 23:06 in the same dormitory building, a comparison revealed that the current actual dew point trajectory does not converge with the assumed trajectory of external air carrying moisture, therefore it was not determined to be dominated by external air carrying moisture.

[0123] To further illustrate, let's take the air supply incident in an office area at 15:10 on July 18, 2026 as an example. The calculations show that:

[0124] Internal moisture release deviation =1.08;

[0125] External air moisture deviation =0.36.

[0126] Therefore, it can be seen that the deviation of external air moisture is significantly smaller than the deviation of internal moisture release. Thus, the high humidity source determination factor is negative and less than the negative number of the second determination threshold. Therefore, the current high humidity source determination result is determined to be dominated by external air moisture.

[0127] Taking a multi-functional classroom scenario as an example, the calculations show that:

[0128] Internal moisture release deviation =0.74;

[0129] External air moisture deviation =0.78.

[0130] At this point, the deviations of the two types are close, and the high humidity source determination factor is between -0.20 and 0.20. Therefore, the current high humidity source determination result is determined to be a mixed source.

[0131] S5. Generate fresh air system control instructions based on the high humidity source determination results.

[0132] When the source of high humidity is determined to be internal moisture release, the fresh air system maintains the necessary ventilation volume and continues to monitor changes in the outdoor dew point; after the outdoor dew point meets the preset low humidity condition, enhanced air supply is then implemented.

[0133] In this embodiment, the preset low humidity condition is set as follows: the outdoor dew point is lower than the indoor dew point and the duration is more than 8 minutes.

[0134] In the dormitory building case, the system maintained the necessary ventilation level from 22:58 to 23:06, with the corresponding equivalent fresh air volume maintained at about 420 m³ / h. When it was detected that the outdoor dew point dropped from 20.1℃ to 17.8℃ after 23:06 and lasted for 8 minutes, enhanced air supply was implemented, increasing the equivalent fresh air volume to 710 m³ / h for 6 minutes to complete centralized dehumidification.

[0135] When the source of high humidity is determined to be mainly external air humidity, the fresh air system should maintain the necessary ventilation volume and limit the increase in air supply.

[0136] In the office area case, after determining that the outside air was dominated by humidity, the system maintained the equivalent fresh air volume at about 380m³ / h and did not continue to increase the air supply until the outdoor dew point dropped significantly before resuming compensatory ventilation.

[0137] When the source of high humidity is determined to be a mixed source, the fresh air system performs trial air supply, then re-collects the real dew point trajectory in several subsequent sampling periods, recalculates the deviation of the dual hypotheses, and re-determines the source of high humidity to decide whether to switch to internal moisture release-dominated control or external air moisture-dominated control.

[0138] In this embodiment, the duration of the trial air supply is set to 4 minutes.

[0139] After generating the fresh air system control command, the method also includes: based on the actual response of the fresh air system, correcting the trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory.

[0140] In this embodiment, the trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory include at least the indoor equilibrium dew point and the internal moisture release time constant; the trajectory construction parameters corresponding to the external air moisture-carrying hypothesis trajectory include at least the external air input time constant, the reference fresh air volume, and the basic parameters corresponding to the air supply enhancement magnitude correction amount.

[0141] If, after determining that internal moisture release is dominant and implementing centralized dehumidification, the system finds that the actual dew point falls slower than the predicted result of the internal moisture release hypothesis trajectory, then the internal moisture release time constant should be appropriately increased, or the estimated indoor equilibrium dew point value should be corrected.

[0142] In this embodiment, after running continuously for 5 nights in the dormitory building, the system found that the originally set internal moisture release time constant of 11 min was too small, so it was corrected to 14 min.

[0143] If, after the system determines that the outside air is humid and restricts the enhanced air supply, the actual dew point rises faster than the predicted trajectory of the outside air humid hypothesis once the air supply is increased, then the outside air input time constant should be appropriately reduced, or the basic parameters corresponding to the reference fresh air volume and the air supply enhancement magnitude correction should be adjusted.

[0144] In this embodiment, during four consecutive afternoon air supply enhancement events in the office area, the system found that the originally set external air input time constant of 4 minutes was too large, so it was corrected to 3 minutes; at the same time, the reference fresh air volume was corrected from 500 m³ / h to 460 m³ / h.

[0145] The above corrections make the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory obtained in subsequent construction more closely resemble the actual moisture behavior of the current building.

[0146] Implementation 2

[0147] The difference between Example 2 and Example 1 is that this example focuses on the identification and control process when the high humidity process is mainly dominated by the moisture carried by the outside air, in scenarios where the outdoor air humidity is high and the fresh air system has an enhanced air supply requirement. Other steps not described in detail, such as data acquisition methods, event segment division methods, dual hypothesis deviation calculation methods, and trajectory construction parameter correction methods, can be referred to Example 1 and will not be repeated here.

[0148] In this embodiment, during the operation of an office area in the rainy season, the fresh air system collects indoor and outdoor environmental status data and equipment status data at a sampling period of 1 minute.

[0149] At 15:10, the equivalent fresh air volume was detected to increase from 410m³ / h to 690m³ / h, and the frequency of the air supply fan increased from 28Hz to 37Hz, meeting the air supply judgment conditions. Therefore, 15:10 was determined as the start time of air supply, and the corresponding air supply event segment was constructed.

[0150] The indoor dew point at the start of air supply is 17.6℃, and the outdoor dew point is 22.8℃.

[0151] Based on the assumption that outdoor air is actively introduced into the room after the air supply is enhanced, and that the current high humidity process is mainly driven by the input of outdoor humid air, the indoor dew point at the start of the air supply is used as the initial value, the difference between indoor and outdoor dew points is used as the input driving force, the air supply enhancement amplitude is used as the input intensity correction amount, and the outdoor air input time constant is used as the transmission speed parameter to construct the hypothetical trajectory of outdoor air carrying moisture.

[0152] Meanwhile, in order to complete the dual hypothesis comparison, the internal moisture release hypothesis trajectory corresponding to the current event is constructed in the same manner as in Example 1.

[0153] After constructing the two types of hypothetical trajectories, the actual indoor dew point change trajectory that is time-aligned with the two hypothetical trajectories is extracted, and the internal moisture release deviation of the actual trajectory relative to the internal moisture release hypothetical trajectory and the external moisture carry-over deviation of the actual trajectory relative to the external moisture carry-over hypothetical trajectory are calculated respectively.

[0154] In this embodiment, the following calculations were performed:

[0155] The internal moisture release deviation is 1.24;

[0156] The deviation of the external air humidity is 0.41.

[0157] Since the deviation of external humidity is significantly smaller than the deviation of internal moisture release, it indicates that the current actual dew point change process is closer to the assumed trajectory of external humidity. Based on the first and second judgment thresholds obtained from historical event samples, both being 0.20, the current high humidity source is determined to be dominated by external humidity.

[0158] Based on the determination of the source of high humidity, the fresh air system maintains the necessary ventilation level and limits the enhancement of air supply.

[0159] In this embodiment, between 15:10 and 15:24, the system maintains the equivalent fresh air volume within the range of 360 m³ / h to 390 m³ / h and ceases to perform subsequent enhanced air supply actions. After 15:25, when the outdoor dew point drops from 22.8°C to 20.9°C and continues to decrease for a preset duration, the system gradually resumes compensatory ventilation, increasing the equivalent fresh air volume to 470 m³ / h.

[0160] After control is completed, the actual dew point response trajectory is collected and compared with the assumed trajectory of the outside air with humidity. If the actual dew point rise rate is still faster than the predicted result, the outside air input time constant and the reference fresh air volume are corrected.

[0161] In this embodiment, during six consecutive afternoon air supply enhancement events, the system found that when the original outdoor air input time constant was set to 3 minutes, the actual dew point rose faster than the predicted result in some events. Therefore, the outdoor air input time constant was corrected to 2.5 minutes, and the reference fresh air volume was corrected from 480 m³ / h to 450 m³ / h.

[0162] Using the method in this embodiment, in scenarios where the outdoor air humidity is high, it is possible to identify that the current high humidity process mainly originates from the outdoor humid air brought in by the enhanced air supply, and on this basis, limit the enhanced air supply to avoid further increase in the indoor dew point.

[0163] The working principle is as follows: First, indoor and outdoor environmental status data and fresh air system equipment status data are periodically collected. Based on the changes in air supply capacity, the system divides the data into air reduction event segments and air supply event segments, thereby transforming continuous operating data into event-level data objects that can characterize the high humidity formation process. Subsequently, for the air reduction event segment, based on the indoor dew point, indoor equilibrium dew point, and internal moisture release time constant at the start of air reduction, an internal moisture release hypothesis trajectory is constructed to characterize the change process of indoor dew point when high humidity is mainly driven by the delayed release of moisture from indoor moisture storage bodies after air reduction. At the same time, for the air supply event segment, based on the indoor dew point, outdoor dew point, indoor-outdoor dew point difference, air supply enhancement amplitude, and outdoor air input time constant at the start of air supply, an outdoor air humidification hypothesis trajectory is constructed to characterize the change process of indoor dew point when high humidity is mainly driven by the input of outdoor humid air after air supply enhancement.

[0164] After constructing the two types of hypothetical trajectories, the actual indoor dew point trajectory is compared with the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory, respectively. By calculating the deviation of the actual trajectory from the two hypothetical trajectories, it is determined whether the current high humidity process is closer to the internal moisture release mechanism or the external air moisture-carrying mechanism, and the source of high humidity is further determined. If the deviation of the actual trajectory from the internal moisture release hypothesis trajectory is small, it indicates that the current high humidity process is mainly dominated by the delayed release of moisture from the indoor moisture storage body; if the deviation of the actual trajectory from the external air moisture-carrying hypothesis trajectory is small, it indicates that the current high humidity process is mainly dominated by the input of outdoor humid air; if the two deviations are similar, it indicates that the current high humidity process has a mixed source.

[0165] After obtaining the high humidity source determination result, the fresh air system control command is generated based on the high humidity source determination result: when it is determined that internal moisture release is dominant, the fresh air system maintains the necessary ventilation level and continues to monitor the outdoor dew point change. Air supply is only executed after the outdoor dew point meets the preset low humidity condition, so as to use favorable windows to dissipate the moisture released late indoors; when it is determined that the outside air carries moisture, the fresh air system maintains the necessary ventilation level and restricts air supply to avoid the continuous entry of outdoor high humidity air into the room; when it is determined that the source is mixed, the fresh air system performs trial air supply, then re-collects the real dew point trajectory in the subsequent sampling periods, recalculates the double hypothesis deviation, and re-determines the high humidity source determination result, thereby selecting the subsequent control direction.

[0166] Furthermore, this invention modifies the trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory based on the actual response of the fresh air system. Specifically, the internal moisture release time constant and indoor equilibrium dew point are corrected by fitting the duration and stabilization time of the actual dew point rise process in the air reduction event sample; the basic parameters corresponding to the external air input time constant, reference fresh air volume, and the correction amount of the air supply enhancement magnitude are corrected by fitting the response time of the indoor dew point after the air supply enhancement in the air supply event sample. This allows the two types of hypothetical trajectories to gradually align with the actual moisture behavior under specific building, season, and operating conditions, improving the accuracy of subsequent high humidity source determination results and the adaptability of fresh air system control commands.

[0167] The electronic device provided in this embodiment is used to execute the corresponding methods provided above.

[0168] This embodiment also provides a storage medium storing instructions that, when executed on an electronic device, cause the electronic device to perform the aforementioned method steps to implement the data storage method in the above embodiment.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0170] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments. For example, all the embodiments above can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0171] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving control method for a fresh air system, characterized in that, Includes the following steps: S1. Periodically collect indoor and outdoor environmental status data and fresh air system equipment status data, and associate the indoor and outdoor environmental status data and the equipment status data according to the sampling time to obtain an operating status data sequence. From the operating status data sequence, divide and construct the wind reduction event segment and the air supply event segment. S2. Based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the wind reduction event segment, construct the internal moisture release hypothesis trajectory; and based on the indoor and outdoor environmental status data and the equipment status data of the fresh air system corresponding to the air supply event segment, construct the external air moisture carryover hypothesis trajectory. S3. Based on the assumed trajectory of internal moisture release and the assumed trajectory of external air moisture carryover, calculate the deviation of internal moisture release and the deviation of external air moisture carryover, respectively. S4. Determine the source of high humidity based on the deviation of internal moisture release and the deviation of external air moisture carryover. S5. Generate fresh air system control instructions based on the high humidity source determination results.

2. The energy-saving control method for a fresh air system according to claim 1, characterized in that: The process of constructing the wind reduction event segment includes: Compare the device status data at adjacent sampling times in the operating status data sequence; When the air supply capacity of the fresh air system is detected to change from a high value to a low value, and the change range reaches the air reduction judgment condition, the corresponding change time is marked as the air reduction start time. Taking the air reduction start time as the center, a data segment of a preset base time is extracted forward from the operation status data sequence, and a data segment of a preset response time is extracted backward. The segments are combined to construct the air reduction event segment. The process of constructing the air supply event segment includes: When the air supply capacity of the fresh air system is detected to change from a low value to a high value, and the change range reaches the air supply judgment condition, the corresponding change time is marked as the air supply start time. Taking the air supply start time as the center, data segments of a preset base time are extracted forward and data segments of a preset response time are extracted backward from the operation status data sequence, and combined to construct the air supply event segment.

3. The energy-saving control method for a fresh air system according to claim 2, characterized in that: The process of constructing the internal moisture release hypothesis trajectory specifically includes: Extract the initial indoor dew point, indoor air state parameters, and equipment state parameters before and after the air reduction start time; Since the fresh air system is in a restricted ventilation state after the air reduction, the current high humidity process is assumed to be mainly driven by the delayed release of moisture from the indoor moisture storage body; The indoor dew point at the start of the wind reduction is used as the initial value, the indoor equilibrium dew point is used as the release target, and the internal moisture release time constant is used as the release rate parameter. The indoor dew point change value at each subsequent moment in the wind reduction event period is deduced by sampling cycle to construct the internal moisture release hypothesis trajectory. The process of constructing the hypothetical trajectory of external air carrying moisture specifically includes: Extract the indoor dew point, outdoor dew point, fresh air volume change, and equipment status parameters before and after air supply at the start of the air supply. Based on the enhanced air supply, outdoor air is actively introduced into the room, and the current high humidity process is assumed to be mainly driven by the input of outdoor humid air; The indoor dew point at the start of the air supply is used as the initial value, the difference between indoor and outdoor dew points is used as the input driving force, the air supply enhancement amplitude is used as the input intensity correction, and the external air input time constant is used as the transmission speed parameter. The indoor dew point change value at each subsequent moment in the air supply event segment is deduced on a sampling cycle basis to construct the hypothetical trajectory of external air carrying moisture.

4. The energy-saving control method for a fresh air system according to claim 3, characterized in that: The calculation process for the internal moisture release deviation includes: Within the first preset comparison window, the absolute value of the difference between the actual indoor dew point value and the internal moisture release hypothesis dew point value at the corresponding time of the internal moisture release hypothesis trajectory is calculated at each sampling time. The absolute value of the difference is then weighted and accumulated based on the first comparison weight corresponding to each sampling time to obtain the internal moisture release deviation.

5. The energy-saving control method for a fresh air system according to claim 4, characterized in that: The calculation process for the external air moisture deviation includes: Within the second preset comparison window, the absolute value of the difference between the actual indoor dew point value and the assumed outdoor dew point value with humidity at each sampling time is calculated. The absolute value of the difference is then weighted and accumulated based on the second comparison weight corresponding to each sampling time to obtain the outdoor humidity deviation.

6. The energy-saving control method for a fresh air system according to claim 5, characterized in that: The process for determining the source of high humidity includes: A high humidity source determination factor is constructed based on the deviation of internal moisture release and the deviation of external air moisture. The first and second judgment thresholds are obtained by calibrating the deviation results of the real indoor dew point trajectory in the historical event samples from the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory, respectively. When the internal moisture release deviation is less than the external air moisture deviation, the high humidity source determination factor is positive; when the external air moisture deviation is less than the internal moisture release deviation, the high humidity source determination factor is negative; when the internal moisture release deviation is equal to the external air moisture deviation, the high humidity source determination factor is zero. When the high humidity source determination factor is greater than or equal to the first determination threshold, it is determined to be a high humidity source dominated by internal moisture release; when the high humidity source determination factor is less than or equal to the negative number of the second determination threshold, it is determined to be a high humidity source dominated by external air moisture; when the high humidity source determination factor is between the negative numbers of the first and second determination thresholds, it is determined to be a high humidity source with mixed sources.

7. The energy-saving control method for a fresh air system according to claim 6, characterized in that: The control commands for the fresh air system generated based on the high humidity source determination results include: When the source of high humidity is determined to be internal moisture release, the fresh air system maintains the necessary ventilation volume and continues to monitor changes in the outdoor dew point. Once the outdoor dew point meets the preset low humidity condition, the air supply will then be activated. When the source of high humidity is determined to be mainly external air humidity, the fresh air system should maintain the necessary ventilation volume and limit the air supply. When the source of high humidity is determined to be a mixed source, the fresh air system performs trial air supply, then re-collects the real dew point trajectory in several subsequent sampling periods, recalculates the deviation of the dual hypotheses, and re-determines the source of high humidity to decide whether to switch to internal moisture release-dominated control or external air moisture-dominated control.

8. The energy-saving control method for a fresh air system according to claim 7, characterized in that: After generating the fresh air system control command, the process also includes: correcting the trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory and the external air moisture-carrying hypothesis trajectory, including: The trajectory construction parameters corresponding to the internal moisture release hypothesis trajectory include at least the indoor equilibrium dew point and the internal moisture release time constant. The indoor equilibrium dew point is constructed based on the average indoor dew point and the trend of indoor temperature and humidity changes in several sampling periods before the start of the wind reduction event. The internal moisture release time constant is fitted based on the duration and stabilization time of the actual dew point recovery process in the historical wind reduction event samples. The trajectory construction parameters corresponding to the assumed trajectory of humid outside air include at least the outside air input time constant, the reference fresh air volume, and the basic parameters corresponding to the air supply enhancement amplitude correction. The outside air input time constant is obtained by fitting the response time of the indoor dew point after air supply enhancement in historical air supply event samples. The reference fresh air volume is constructed based on the average equivalent fresh air volume during the normal operation phase of the system or the rated operating parameters of the equipment. The basic parameters corresponding to the air supply enhancement amplitude correction are constructed based on the change amplitude of the equivalent fresh air volume in the current air supply event period.

9. An electronic device, characterized in that, include: processor; as well as A memory storing program instructions that, when executed by the processor, cause the electronic device to perform the method according to any one of claims 1-8.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium storing computer-readable instructions thereon, which, when executed by one or more processors, implement the method as described in any one of claims 1-8.

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