CN113983659B - Fresh air system control method and control device thereof - Google Patents
Fresh air system control method and control device thereof Download PDFInfo
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- CN113983659B CN113983659B CN202111211462.4A CN202111211462A CN113983659B CN 113983659 B CN113983659 B CN 113983659B CN 202111211462 A CN202111211462 A CN 202111211462A CN 113983659 B CN113983659 B CN 113983659B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/10—Weather information or forecasts
Abstract
The invention provides a control method and a control device of a fresh air system, wherein the control method comprises the following steps: acquiring target ventilation time and preset temperature of a user in a future time period; acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast temperature; respectively calculating the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period, and sequencing each time period according to the absolute value of the temperature difference; selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result; and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period. The invention has the beneficial effects that: the ventilation can be completed in the most suitable time for ventilation, and the influence of outdoor severe environment on the indoor air environment is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method and a control device of a fresh air system.
Background
In recent years, air pollution is increasingly serious, people pay more attention to the air quality problem, and the fresh air system is more and more widely applied to home places, office places and business places.
The fresh air system usually comprises a purification system and a total heat exchanger, wherein the purification system is used for purifying air when outdoor air enters a room, the main purification measures comprise filtration, sterilization and disinfection and oxygen enrichment, and the total heat exchanger can exchange heat of the outdoor air and heat of indoor air to keep the indoor temperature at a stable level and avoid indoor temperature mutation caused by large amount of sucked outdoor cold air or hot air.
The control method of the fresh air system in the prior art mainly comprises two methods, one method is to control the fresh air system by setting working parameters such as opening time, closing time, ventilation air speed and the like in a control device; and the other type of the system detects parameters such as indoor temperature and humidity, outdoor temperature and humidity, indoor carbon dioxide content and the like through various sensors, compares the detected parameters with preset values, and generates a control instruction to control the fresh air system to work. The two control methods have the defects that the ventilation requirement cannot be met in the time period most suitable for ventilation, particularly in severe weather, the fresh air system cannot be controlled to ventilate in the time period most suitable for opening by setting the opening and closing time, the fresh air system is not suitable for opening ventilation due to severe weather or serious air pollution in the time period for setting the opening ventilation, the ventilation efficiency is low and the indoor air quality can be reduced due to the opening ventilation, unnecessary energy consumption is caused, and the fresh air system is controlled by monitoring parameters in real time, so that the fresh air system cannot be ventilated for a long time or the ventilation time cannot meet the user requirement due to the severe weather and the unsatisfied preset ventilation conditions.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a fresh air system control method and a control device thereof, which can complete ventilation in the most suitable ventilation time period according to the ventilation requirement in severe weather.
Based on the above purpose, the present application provides a control method for a fresh air system, the control method comprising:
s1: acquiring target ventilation time and preset temperature of a user in a future time period;
s2: acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast air temperature;
s3: respectively calculating the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period, and sequencing each time period according to the absolute value of the temperature difference;
s4: selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result;
s5: and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period.
Further, the control method further includes:
s6: and when the ventilation control of one time period is finished, the target ventilation time length is subtracted from the ventilation time length of the current time period and is reconfigured into the target ventilation time length, and the steps S2-S5 are repeatedly executed until the target ventilation time length is zero, and the process is finished.
Further, the mode of taking a breath of new trend system includes: a direct ventilation mode and a heat exchange ventilation mode.
Further, the control method comprises the step of acquiring data of indoor temperature and outdoor temperature in real time before executing the ventilation control strategy step.
Further, the ventilation control strategy comprises: if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is less than or equal to the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; and if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is greater than the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode.
Further, the ventilation control strategy further comprises: if the indoor temperature is higher than the preset temperature and the indoor temperature is higher than the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; and if the indoor temperature is higher than the preset temperature and the indoor temperature is lower than or equal to the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode.
Further, the weather forecast information obtained in step S2 further includes an air quality index.
Further, the sorting manner in step S4 further includes setting a weighting coefficient of the air quality index and the temperature difference, and performing a weighted operation on the absolute values of the air quality index and the temperature difference and then sorting to form a sorting result.
Further, the time length of each time zone is set to 1 hour.
Based on the above object, the present application further provides a fresh air system control device, including:
an input unit for inputting a target ventilation duration and a preset temperature in a future time period;
the weather forecast information acquisition unit is used for acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast temperature;
the sensor unit is used for acquiring indoor and outdoor real-time temperature data;
the main control unit is configured to calculate the temperature difference between the forecast air temperature and the preset temperature of each time period in the time period based on the data information of the input unit, the weather forecast information acquisition unit and the sensor unit, and sort the time periods according to the absolute value of the temperature difference; selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result; and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period.
Therefore, the invention has the following beneficial effects: the method comprises the steps of acquiring weather forecast information from a network server, calculating a time end which is most suitable for ventilation in a time period according to the weather forecast information, and selecting a corresponding ventilation strategy for ventilation in a corresponding time period, so that the optimal ventilation effect is achieved on the premise of ensuring the required ventilation time.
Drawings
Fig. 1 is a flowchart of a fresh air system control method according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a fresh air system control method according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a fresh air system control device of the present invention.
FIG. 4 is a control strategy logic relationship diagram of the fresh air system control method of the present invention.
Detailed Description
In order to enable a reader to better understand the design purpose of the method, the following specific embodiments are provided so that the reader can visually understand the structure, structural composition, action principle and technical effect of the method. It should be noted that the following embodiments are not intended to limit the technical solutions of the present methods, and those skilled in the art can analyze and understand the embodiments and make a series of modifications and equivalent substitutions on the technical solutions provided by the present methods in combination with the prior knowledge, and the new technical solutions obtained by the modifications and equivalent substitutions are also encompassed by the present methods.
Example 1
As shown in fig. 1, a control method of a fresh air system includes:
s1: acquiring target ventilation time and preset temperature of a user in a future time period; the time period is usually set to one day according to the use requirement of the user, and the specific time duration can be set according to the use requirement of the user.
S2: acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast air temperature; the time length of the time period is usually set to 1 hour, and can also be set to any time length according to the use requirements of users, and only the obtained weather forecast information is required to cover the time period set by the users, the weather forecast information can usually obtain the average air temperature of each day in 15 days and the average air temperature of each hour in 24 hours, taking the time period length as 1 hour as an example, the forecast air temperature of each hour in one day is obtained, and the forecast air temperature is the average air temperature of 24 hours per hour in the current day issued by the weather center.
S3: respectively calculating the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period, and sequencing each time period according to the absolute value of the temperature difference; under normal conditions, the predicted air temperature is accurate or has a small error with the actual temperature, and the temperature difference between the predicted air temperature and the preset temperature is the temperature value required to be adjusted by the air conditioning system. If the temperature difference values of 2 time periods are the same, sequencing is carried out according to the time sequence.
S4: selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result; in order to reduce the power consumption of the air conditioning system, a plurality of time periods with the minimum absolute value of the temperature difference are selected for ventilation, the time sum of all the ventilation time periods is equal to the target ventilation time, and the optimal ventilation time period is selected for ventilation on the premise of ensuring the completion of the task of the ventilation time period.
S5: and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period. And when the actual time reaches the selected corresponding time period, the set ventilation strategy automatically controls the fresh air system to work in the corresponding ventilation mode.
S6: and when the ventilation control of one time period is finished, reconfiguring the value obtained by subtracting the ventilation time of the current time period from the target ventilation time to the target ventilation time, and repeatedly executing the steps S2-S5 until the target ventilation time is zero. Because the updating time of the 24-hour hourly weather forecast is once in 45-60 minutes, under the condition that the duration of each time period is set to be 1 hour, the accuracy of the weather forecast can be effectively improved by reading the weather forecast information of the subsequent time period again after the ventilation control of one hour is finished, and the error between the weather forecast information and the actual weather information can be reduced by generating the fresh air system control method based on the latest weather forecast information, so that the time period which is most suitable for ventilation can be selected for ventilation.
The mode of taking a breath of new trend system includes two kinds: a direct ventilation mode and a heat exchange ventilation mode. The direct ventilation mode is mainly suitable for three conditions, namely, when the indoor temperature is higher than the outdoor temperature and needs to be reduced, the indoor temperature is lower than the outdoor temperature and needs to be increased, and when the temperature difference between the indoor temperature and the outdoor temperature is small, the ventilation efficiency of the ventilation mode is high, and the energy consumption is low; the heat exchange ventilation mode is mainly suitable for two conditions, wherein the indoor temperature is lower than the outdoor temperature and needs to be cooled, the indoor temperature is higher than the outdoor temperature and needs to be heated, the air exhaust and the fresh air are isolated from each other in the heat exchange ventilation mode and can transmit heat to each other, the indoor temperature can be kept at a stable level, and energy loss caused by deviation of the indoor temperature from the preset temperature due to the fact that a large amount of cold air or hot air outside the room is sucked is avoided.
The fresh air system control method of the embodiment comprises the step of acquiring data of indoor temperature and outdoor temperature in real time when a ventilation control strategy is executed. The ventilation control strategy includes: if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is less than or equal to the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is greater than the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode; if the indoor temperature is higher than the preset temperature and the indoor temperature is higher than the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; and if the indoor temperature is higher than the preset temperature and the indoor temperature is lower than or equal to the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode. When the indoor temperature is less than or equal to the preset temperature and the indoor temperature is less than or equal to the outdoor temperature, a direct ventilation mode is adopted, and the indoor temperature is accelerated to rise to the preset temperature by utilizing air with higher outdoor temperature; if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is greater than the outdoor temperature, a heat exchange ventilation mode is adopted, and the heat loss of indoor air is reduced; when the indoor temperature is higher than the preset temperature and the indoor temperature is higher than the outdoor temperature, a direct ventilation mode is adopted, and the indoor temperature is quickly reduced to the preset temperature by utilizing the air with relatively low outdoor temperature; if the indoor temperature is higher than the preset temperature and the indoor temperature is lower than or equal to the outdoor temperature, a heat exchange ventilation mode is adopted to prevent heat in outdoor high-temperature air from entering the room and further increasing the indoor temperature.
As an implementation manner, as shown in fig. 3, the present application further provides a fresh air system control device, where the control device includes:
an input unit for inputting a target ventilation time period and a preset temperature in a future time period;
the weather forecast information acquisition unit is used for acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast temperature;
the sensor unit is used for acquiring indoor and outdoor real-time temperature data;
the main control unit is configured to calculate the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period based on the data information of the input unit, the weather forecast information acquisition unit and the sensor unit, and sort the time periods according to the absolute value of the temperature difference; selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result; and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period.
Example 2
As shown in fig. 2, the control method of the fresh air system in the present implementation manner is different from the foregoing implementation manner in that the acquired weather forecast information includes air quality index data in addition to air temperature data, and a weight coefficient of influence of air temperature and air quality on ventilation comfort is obtained through experiments or a user historical ventilation rule. The specific implementation mode is as follows: a control method of a fresh air system comprises the following steps:
s1: acquiring target ventilation time and preset temperature of a user in a future time period; the time period is generally set to one day according to the user's usage requirements.
S2: acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast air temperature and an air quality index; the weather forecast information is a 24-hour hourly weather forecast issued by a weather forecast center.
S3: respectively calculating the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period, and sequencing each time period according to the absolute value of the temperature difference; under normal conditions, the predicted air temperature is considered to be accurate or has a small error with the actual temperature, and the temperature difference between the predicted air temperature and the preset temperature is the temperature value required to be adjusted by the air conditioner or the heating equipment.
S4: setting the weighting coefficients of the air quality index and the temperature difference, and sequencing the numerical values of the air quality index and the absolute value of the temperature difference after weighting operation from small to large to form a sequencing result; the air quality index and the temperature can directly influence the ventilation effect, so that the ventilation effect of the selected ventilation time can be further improved by adding the air quality index into the judgment basis.
S5: and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period. And when the actual time reaches the selected corresponding time period, the set ventilation strategy automatically controls the fresh air system to work in the corresponding ventilation mode.
S6: and when the ventilation control of one time period is finished, the target ventilation time length is subtracted from the ventilation time length of the current time period and is reconfigured into the target ventilation time length, and the steps S2-S5 are repeatedly executed until the target ventilation time length is zero, and the process is finished.
According to the embodiment, the air quality index is added as a judgment basis according to the user requirement, the time period suitable for ventilation is screened out more accurately, the comfort of the user during ventilation is improved, and the accuracy of the selected optimum ventilation time period is further improved by setting the weight coefficient. In other embodiments, numerical indexes such as wind power and humidity can be added as judgment bases. Meanwhile, in order to facilitate the use of the user, any time period may be set as a non-ventilation time period or a forced ventilation time period, ventilation is not started in a time period in which the user does not want to start ventilation, if the user sets the non-ventilation time period, the non-ventilation time period may be directly removed in the time period of step S1, or the non-ventilation time period set by the user may be removed when the sorting result is formed in S4; if the user sets a forced ventilation time period, the ventilation is forcibly started when the time reaches the set time, and the completed ventilation time period is subtracted from the target ventilation time period when the ventilation is completed in the set forced ventilation time period.
The present application is further described below with reference to actual weather data. For example, the target ventilation time period set by the user on a certain day is 3 hours, the preset temperature is 26 ℃, for convenience of description, only 8-14 points on the day are set as the ventilation time period, and the rest time periods are set as the non-ventilation time period. The air temperature and air quality index forecast is as follows, 24 hours per hour on the day:
the temperature difference of each time period obtained in the step S3 can be obtained through the temperature data of each time period in the weather forecast and the preset temperature data, the absolute value of the temperature difference is obtained and sorted from small to large, and if the temperature difference values are the same, the temperature differences are sorted in the time sequence, as shown in the following table:
if the weighting coefficients of the air quality index and the temperature difference between the actual temperature and the preset temperature are set to be 0.1 and 0.9 (actually, the weighting coefficients can be set according to repeated experiments and user ventilation condition investigation), the air quality index and the temperature difference between the actual temperature and the preset temperature are multiplied by the respective weighting coefficients and then are sorted to obtain the air quality index and the temperature difference (the numerical value obtained by multiplying the air quality index and the temperature difference by the respective weighting coefficients is set as a proper ventilation index, and the lower the numerical value is, the more proper ventilation is obtained):
as can be seen from the above table, 3 hours (target ventilation duration) most suitable for ventilation in the daily ventilation time period are 12:00-13:00, 11:00-12:00, and 9:00-10:00, so that the fresh air system is controlled to start ventilation when the actual time reaches the corresponding time period, when the ventilation operation is performed, the time period for performing ventilation is 9:00-10:00 at first, and after the ventilation in the time period is completed, the weather forecast information issued by the weather forecast center for 24 hours every hour can be selected to be reacquired, and the above operations and sequencing are performed again to ensure the accuracy of the forecast information (the accuracy is higher as the forecast time is closer), so that more accurate information of the suitable ventilation time is obtained. And after the ventilation in the time period of 9:00-10:00 is finished, deducting the current finished ventilation time length from the original target ventilation time length, namely changing the target ventilation time length from the original 3 hours to 2 hours until the target ventilation time length is zero, indicating that the ventilation task is finished on the same day, and finishing the program.
The control process is explained by taking a time period of 9:00-10:00 as an example, firstly, the current indoor temperature and the current outdoor temperature are respectively detected to be 23 ℃ and 24 ℃ through a sensor, and because the indoor temperature is lower than the preset temperature of 26 ℃ and the indoor temperature is lower than the outdoor temperature, the fresh air system is controlled to ventilate in a direct ventilation mode so as to accelerate the temperature of the indoor air to rise to the preset temperature by utilizing the heat of the outdoor air, and when the indoor temperature is heated to 25 ℃ through an air conditioner or a heating device, the fresh air system is controlled to be switched to a heat exchange ventilation mode so as to prevent the heat in the indoor air from losing.
In summary, according to the fresh air system control method and the control device thereof, the weather forecast information issued by the weather forecast center is acquired from the network, the specific time period and the ventilation strategy which are most suitable for ventilation in a time period are determined according to the weather forecast information and the expected indoor temperature of the user, and the relative accuracy of the weather forecast information is ensured by updating the weather forecast information for many times. The problem that in the prior art, when ventilation is performed by setting fixed time by a user, the user cannot judge that the specific time period is suitable for ventilation and cannot start ventilation in the suitable time period is solved; meanwhile, the problem that ventilation cannot be started for a long time due to bad weather or the ventilation time cannot be accurately controlled when the ventilation is automatically started only by detecting environmental parameters in the prior art is solved.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims. The drawings corresponding to the specific embodiments exist in a form assisting understanding, and a reader can conveniently understand the abstract upper concept of the technical idea related to the method by understanding the specific visualized lower concept. When the overall understanding of the method and the comparison with other technical solutions except the technical solution provided by the method are carried out, the expression of the attached drawings should not be taken as the only reference, and a series of modifications, equivalent substitutions, mixed combinations of characteristic elements, deletion and recombination of unnecessary technical characteristic elements, reasonable addition and recombination of the unnecessary technical characteristic elements common in the prior art and the like which are made according to the attached drawings or without referring to the attached drawings after the concept of the method is understood to be included in the spirit of the method.
Claims (10)
1. A control method of a fresh air system is characterized by comprising the following steps:
s1: acquiring target ventilation time and preset temperature of a user in a future time period;
s2: acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast air temperature;
s3: respectively calculating the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period, and sequencing each time period according to the absolute value of the temperature difference;
s4: selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result;
s5: and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period.
2. The fresh air system control method according to claim 1, wherein the control method further comprises:
s6: and when the ventilation control of one time period is finished, the target ventilation time length is subtracted from the ventilation time length of the current time period and is reconfigured into the target ventilation time length, and the steps S2-S5 are repeatedly executed until the target ventilation time length is zero, and the process is finished.
3. The method as claimed in claim 1, wherein the ventilation mode of the ventilation system comprises: a direct ventilation mode and a heat exchange ventilation mode.
4. The fresh air system control method according to claim 1, wherein the control method comprises acquiring data of indoor temperature and outdoor temperature in real time before executing the ventilation control strategy step.
5. The fresh air system control method according to claim 4, wherein the ventilation control strategy comprises: if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is less than or equal to the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; and if the indoor temperature is less than or equal to the preset temperature and the indoor temperature is greater than the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode.
6. The fresh air system control method according to claim 5, wherein the ventilation control strategy further comprises: if the indoor temperature is higher than the preset temperature and the indoor temperature is higher than the outdoor temperature, controlling the fresh air system to work in a direct air exchange mode; and if the indoor temperature is higher than the preset temperature and the indoor temperature is lower than or equal to the outdoor temperature, controlling the fresh air system to work in a heat exchange ventilation mode.
7. The fresh air system control method according to claim 1, wherein the weather forecast information obtained in the step S2 further includes an air quality index.
8. The fresh air system control method according to claim 7, wherein the sorting manner in the step S4 further includes setting a weighting coefficient for the air quality index and the temperature difference, and performing a weighted operation on the absolute values of the air quality index and the temperature difference to perform sorting, thereby forming a sorting result.
9. The fresh air system control method according to claim 1, wherein the time length of each time period is set to 1 hour.
10. The utility model provides a new trend system control device for control new trend system, its characterized in that, controlling means includes:
an input unit for inputting a target ventilation duration and a preset temperature in a future time period;
the weather forecast information acquisition unit is used for acquiring weather forecast information of each time period in the time period, wherein the weather forecast information comprises forecast temperature;
the sensor unit is used for acquiring indoor and outdoor real-time temperature data;
the main control unit is configured to calculate the temperature difference between the forecast air temperature and the preset temperature in each time period in the time period based on the data information of the input unit, the weather forecast information acquisition unit and the sensor unit, and sort the time periods according to the absolute value of the temperature difference; selecting a plurality of time periods with the minimum absolute value of the temperature difference by taking the target ventilation time as the total time, and sequencing the time periods in time sequence to form a sequencing result; and sequentially reading the time periods from the sequencing result in time sequence, and controlling the fresh air system to switch the ventilation mode based on a ventilation control strategy when the actual time reaches the corresponding time period.
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