Energy-saving control system and control method for MAU all-fresh air unit

Abstract

The invention discloses an energy-saving control system for an MAU (Multi-Access Unit) all fresh air unit, which belongs to the technical field of energy-saving control, and comprises a plurality of groups of detection modules arranged in the same place with an air supply port of a fan; the communication transmission module is electrically connected with the plurality of groups of detection modules and transmits information of the detection modules backwards; the calculation module is used for receiving the information of the communication transmission module and calculating the air supply volume and the air supply temperature and humidity based on the information; and the output control module is used for receiving the calculation result of the calculation module and controlling the cold supply power of the fan based on the result. The detection module senses the operation condition of the equipment and the number of personnel in the field, so that the influence parameters of the equipment and the personnel are added in the calculation of the total heat load Qt in the field, the calculation of the total heat load Qt is more accurate, the regulation and control of the cold supply power of the MAU full fresh air unit are more reasonable, and the use effect of the equipment is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy-saving control, and in particular relates to an energy-saving control system and a control method for a MAU fresh air unit. Background Art

[0002] MAU (Make up Air Unit) fresh air unit, that is, the fresh air unit for outdoor air, can send the outdoor air into the clean room at a constant temperature and humidity to maintain the positive pressure of the clean room, provide clean air in the clean room and realize precise control of the temperature and humidity in the clean room.

[0003] The characteristics of MAU fresh air units determine that MAU fresh air units are often used in high-demand venues such as laboratories, precision production workshops, and collection rooms that require constant temperature and humidity. The temperature control of the MAU fan is divided into a temperature adjustment stage and a temperature control stage. The temperature adjustment stage is used to adjust the temperature to the set temperature, and the temperature control stage is used to maintain the temperature balance in the venue. In theory, in the temperature control stage, when the cold (heat in some cases) delivered by the MAU fresh air unit forms a stable balance with the heat obtained by the indoor and outdoor heat exchange, the energy consumption of the MAU fresh air unit is the lowest. In actual applications, the venue will be affected by equipment and personnel, especially in small venues. The entry and exit of personnel and the startup of equipment directly affect the air supply requirements of the MAU fresh air unit. In the venue, the equipment and personnel The situation has a certain randomness, especially when the workers in the site need to hand over shifts, eat, rest or go to the toilet. The number of people entering and leaving the site and the time are random, which greatly increases the difficulty of calculating the air supply of the MAU fresh air unit. Moreover, unlike the switch switching of the lighting control energy-saving system, which can be started and stopped in real time according to the personnel in the site, the air supply switching of the MAU fresh air unit itself will also consume energy, and frequent switching will also affect the stability and service life of the equipment. It is very necessary to design a new MAU fresh air unit control system and method for the MAU fresh air unit that cannot achieve the energy-saving lighting control system. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving control system and control method for a MAU fresh air unit, so as to solve the problems of the existing MAU fresh air unit control system during use raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-saving control system for a MAU fresh air unit, comprising a plurality of detection modules arranged in the same venue as the air supply port of the fan; a communication transmission module electrically connected to the plurality of detection modules and transmitting the information of the detection modules backward; a calculation module for receiving the information of the communication transmission module and calculating the air supply volume and the air supply temperature and humidity based on the information; an output control module for receiving the calculation result of the calculation module and controlling the cooling power of the fan based on the result;

[0006] The detection module includes a temperature and humidity sensing module, a pyroelectric infrared thermal sensing module and a human body sensing module for sensing the temperature and humidity in the venue. The temperature and humidity sensing module transmits the temperature and humidity information in the venue in real time through the communication transmission module. The pyroelectric infrared thermal sensing module and the human body sensing module respectively sense the equipment and personnel information in the venue.

[0007] The calculation module calculates the total heat load Qt in the site based on the data of the detection module, and controls the cooling power of the fan accordingly; the calculation module also includes a benefit calculation module, and before controlling the change of the cooling power of the fan, the benefit calculation module calculates the benefit of the regulation and controls whether the regulation is executed or not.

[0008] Preferably, the benefit calculation module is provided with a database, which records the energy consumption of power switching of several groups of MAU fresh air units, and the benefit calculation module calculates the energy consumption of a single MAU fresh air unit power switching based on the database information.

[0009] Preferably, the human body sensing module is an identity card, an identifier or an infrared human body sensor.

[0010] The control method of the MAU new air unit energy-saving control system includes the following steps:

[0011] S1, obtaining the equipment information and personnel information in the venue in sequence through the detection module, and transmitting the equipment information and personnel information to the calculation module;

[0012] S2, the calculation module calculates the total heat load Qt (unit W) based on the detection module information and generates a total heat load Qt / time curve;

[0013] S3, regenerate the cooling power / time curve of the MAU fresh air unit on the total heat load Qt / time curve, and calculate the difference △P between the total heat load Qt / time curve and the cooling power / time curve of the MAU fresh air unit based on the two;

[0014] S4, the benefit calculation module calculates the power switching power P of a single MAU fresh air unit based on the energy consumption of a single MAU fresh air unit power switching. 损失 , and compare the calculated △P and P 损失 The difference between

[0015] S5, based on the results of S3 and S4, the output control module chooses or does not choose to regulate the cooling power of the MAU fresh air unit.

[0016] Preferably, the total heat load Qt is equal to the sum of the site heat load Q1, the equipment heat load Q2 and the human body heat load Q3.

[0017] Preferably, the site heat load Q1=site area S*unit area heat load index P*correction coefficient C.

[0018] Preferably, the equipment heat load Q2=site equipment operating power*0.8, and the human body heat load Q3=number of people on the site*human body heat load power.

[0019] Preferably, the energy consumption of a single MAU fresh air group power switching is the average of several groups of switching MAU fresh air group power switching energy consumption data in the database.

[0020] Preferably, when ΔP is a negative value, the output control module directly performs regulation; when ΔP is a positive value, and ΔP is equal to P 损失 The difference between the difference of ΔP and P is positive, and the output control module performs regulation; when ΔP is positive, and ΔP is equal to P 损失 If the difference of the difference is a negative value, the output control module does not perform regulation.

[0021] Preferably, when performing regulation, the output control module switches the power of the MAU fresh air unit to be equal to the total heat load Qt.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The detection module senses the operation status of the equipment and the number of personnel in the venue, thereby adding the influencing parameters of equipment and personnel to the calculation of the total heat load Qt in the venue, making the calculation of the total heat load Qt more accurate, making the cooling power regulation of the MAU fresh air unit more reasonable, and the use effect of the equipment better;

[0024] 2. When the system determines the power switching node of the MAU fresh air unit, it calculates the energy loss during the switching process, so that the power switching of the MAU fresh air unit is more reasonable, the energy consumption of the MAU fresh air unit is lower, and at the same time, the frequent switching of the power of the MAU fresh air unit is avoided to a certain extent, which has better practical significance;

[0025] 3. The system is suitable for power control of MAU fresh air units in scenarios with many site uncertainties. It responds quickly to changes in the start and stop of site equipment and personnel changes, thereby flexibly and quickly adjusting the cooling power of the MAU fresh air units, making the air supply of the MAU fresh air units to the site more flexible and the air supply effect in the site better and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the system flow of the present invention;

[0027] Figure 2 It is a schematic diagram of the calculation flow of the calculation module of the present invention;

[0028] Figure 3 The total heat load Qt / time curve of one embodiment of the present invention;

[0029] Figure 4 is a total heat load Qt / time curve of another embodiment of the present invention;

[0030] Figure 5 This is a total heat load Qt / time curve of yet another embodiment of the present invention.

[0031] In the figure: 1. Detection module; 11. Temperature and humidity sensing module; 12. Pyroelectric infrared thermal sensing module; 13. Human body sensing module; 2. Communication transmission module; 3. Calculation module; 31. Income calculation module; 4. Output control module. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] According to Figure 1-5 , the MAU fresh air unit energy-saving control system includes a plurality of detection modules 1 arranged in the same place as the air supply port of the fan; a communication transmission module 2 electrically connected to the plurality of detection modules 1 and transmitting the information of the detection modules 1 backward; a calculation module 3 for receiving the information of the communication transmission module 2 and calculating the air supply volume and the air supply temperature and humidity based on the information; an output control module 4 for receiving the calculation result of the calculation module 3 and controlling the cooling power of the fan based on the result;

[0034] The detection module 1 includes a temperature and humidity sensing module 11, a pyroelectric infrared heat sensing module 12 and a human body sensing module 13 for sensing the temperature and humidity in the venue. The temperature and humidity sensing module 11 transmits the temperature and humidity information in the venue in real time through the communication transmission module 2. The pyroelectric infrared heat sensing module 12 and the human body sensing module 13 sense the equipment and personnel in the venue respectively.

[0035] The calculation module 3 calculates the total heat load Qt in the site based on the data of the detection module 1, and controls the cooling power of the fan accordingly; the calculation module 3 also includes a benefit calculation module 31. Before controlling the change of the cooling power of the fan, the benefit calculation module 31 calculates the benefit of the regulation and controls whether the regulation is executed or not.

[0036] For the energy-saving control of the MAU fresh air unit, it is first necessary to accurately calculate the cooling capacity of the MAU fresh air unit, and then control the cooling power of the MAU fresh air unit. Therefore, the calculation of the cooling capacity of the fan unit is a key link. The existing practice is to determine the cooling capacity of the fan unit by calculating the total heat load Qt. In the conventional calculation, the total heat load Qt generally only calculates the self-heating in the venue, so that the cooling capacity of the fan unit is equal to the self-heating in the venue, thereby regulating the cooling power of the air-conditioning unit. In a small venue, the heat load of the equipment and personnel in the venue will directly affect the total heat load Qt of the venue, making the above calculation results inaccurate, and the power control of the air-conditioning unit is inaccurate, so that the cooling capacity in the venue cannot meet the actual use demand or there is energy waste;

[0037] In the present technical solution, the calculation of the total heat load Qt in the venue also includes the heat dissipation of the equipment and human body in the venue. Specifically, the equipment information is sensed by the pyroelectric infrared thermal sensing module 12, and the pyroelectric infrared thermal sensing module 12 senses and obtains the start and stop information of the equipment. Combined with the operating power of the equipment in the venue, the total power of the equipment in the venue can be calculated, and the equipment in the venue can be obtained by calculating the total power of the running equipment; similarly, the human body sensing module 13 can sense the number of people in the venue, and then calculate the heat dissipation of the human body, so as to more accurately calculate the total heat load Qt in the venue, so that the cooling capacity control of the air-conditioning unit is more accurate, and the energy loss is less, which is beneficial to the energy saving and consumption reduction of the air-conditioning unit, and more green and energy-saving;

[0038] Although the detection module 1 senses the operation status of the equipment and the number of people in the venue, and then in the calculation process, a more accurate total heat load Qt is finally calculated, but when the fresh air unit switches the air supply power to adjust the air supply cooling capacity, it is necessary to switch and adjust the power of the fan, air compressor and other equipment of the fresh air unit, so controlling the switching of the air conditioning unit itself will generate a certain amount of energy consumption. Therefore, if the total heat load Qt changes, the air conditioning unit switches the cooling power in real time, which does not necessarily reduce the energy consumption in the system;

[0039] Based on this problem, a profit calculation module 31 is also provided on the calculation module 3 of the present technical solution. The profit calculation module 31 is used to balance the energy consumption cost when a single air-conditioning unit is switched and the energy consumption benefit during the switching period. When the energy consumption cost when a single air-conditioning unit is switched is greater than the energy consumption benefit obtained during the switching period, although the energy consumption of the air-conditioning unit decreases after the switching, the switching cooling power cannot make up for the energy loss generated during the switching, and thus the switching is not performed; when the energy consumption cost during the switching is less than the energy consumption benefit obtained during the switching period, the energy consumption benefit of the switching is a positive benefit, and thus the switching is performed.

[0040] Furthermore, the benefit calculation module 31 is provided with a database, which records the energy consumption of power switching of several groups of MAU fresh air units. The benefit calculation module 31 calculates the energy consumption of a single MAU fresh air unit power switching based on the database information.

[0041] The database is pre-entered with energy consumption data of several groups of MAU fresh air units when switching power. Based on the database information, the energy consumption of executing this cooling power switching is estimated, and this is used to assist in determining whether to execute the cooling power switching of the MAU fresh air units. The database also monitors the actual energy consumption of this MAU fresh air unit power switching, and supplements the database with the actual energy consumption data of this switching.

[0042] Furthermore, the human body sensing module 13 is selected from an identity card, a reader or an infrared human body sensor.

[0043] The human body sensing module 13 is used to sense the number of people in the venue. One feasible method is to install an infrared human body sensor in the venue to sense the number of people in the venue. In another implementation, people in the venue can be given identity cards to determine the information of people in the venue.

[0044] The control method of the MAU new air unit energy-saving control system includes the following steps:

[0045] S1, obtaining the equipment information and personnel information in the venue in sequence through the detection module 1, and transmitting the equipment information and personnel information to the calculation module 3;

[0046] S2, the calculation module 3 calculates the total heat load Qt (unit W) based on the information of the detection module 1, and generates a total heat load Qt / time curve;

[0047] S3, regenerate the cooling power / time curve of the MAU fresh air unit on the total heat load Qt / time curve, and calculate the difference △P between the total heat load Qt / time curve and the cooling power / time curve of the MAU fresh air unit based on the two;

[0048] S4, the benefit calculation module 31 calculates the single MAU fresh air unit power switching power P based on the single MAU fresh air unit power switching energy consumption 损失 , and compare the calculated △P and P 损失 The difference between

[0049] S5, based on the results of S3 and S4, the output control module 4 chooses or does not choose to adjust the cooling power of the MAU fresh air unit.

[0050] The detection module 1 obtains equipment information and personnel information. The total heat load Qt includes the heat load of the equipment and personnel in the venue, and the calculation of the cooling power is more accurate; the total heat load Qt / time curve also generates the MAU fresh air unit cooling power / time curve, in which the total heat load Qt / time curve reflects the theoretical optimal cooling power of the MAU fresh air unit at that moment, and the MAU fresh air unit cooling power / time curve reflects the actual cooling power of the MAU fresh air unit at that moment. In the theoretical model, when the two completely overlap, the MAU fresh air unit cooling power is most suitable and the MAU fresh air unit is the most energy-efficient;

[0051] Therefore, the cooling power of the MAU fresh air unit is adjusted to gradually fit the total heat load Qt curve. In theory, the MAU fresh air unit has the lowest energy consumption. However, in actual application environments, the total heat load Qt changes dynamically due to changes in equipment and personnel. Continuous switching will also cause switching energy consumption and equipment aging problems. The control method of this technical solution calculates the difference △P between the two, and then compares it with the MAU fresh air unit power switching power P during the switching process. 损失 By comparison, the benefits during the switching process can be calculated, and the time point for controlling the MAU fresh air unit to switch to supply cooling power can be obtained.

[0052] Furthermore, the total heat load Qt is equal to the sum of the site heat load Q1, the equipment heat load Q2 and the human body heat load Q3.

[0053] Furthermore, the site heat load Q1 = site area S*unit area heat load index P*correction coefficient C.

[0054] Furthermore, equipment heat load Q2 = site equipment operating power * 0.8, human heat load Q3 = number of people on site * human heat load power.

[0055] The system determines the cooling power of the MAU fresh air unit by calculating the total heat load Qt (unit W) in the site, thereby controlling whether it is necessary to switch and adjust the cooling power of the MAU fresh air unit. The total heat load Qt of this solution = site heat load Q1 + equipment heat load Q2 + human heat load Q3. The total heat load Qt is accurately calculated by calculating the site heat load Q1, equipment heat load Q2 and human heat load Q3 in sequence. Specifically:

[0056] Calculation of site heat load Q1: Site heat load Q1 = site area S (unit: m 2 )*Heat load per unit area P (unit W / m 2)*Correction coefficient C. In the process of calculating the site heat load Q1, the site area S is known. The site heat load index P can be calculated by the heat consumption formula, or it can be estimated by looking up the table based on the type of site. The correction coefficient C is used to correct the calculation formula and make the site heat load Q1 calculation more accurate. In the specific implementation, when the MAU brand-new fresh air unit delivers cold air to the site in summer, due to the high daytime sunlight and high heat in summer, the corresponding correction coefficient C is greater than 1 and takes a value of 1.2. When delivering cold air in autumn, the corresponding correction coefficient decreases and takes 0.8. In this scheme, the correction coefficient C is a dynamically changing value.

[0057] Regarding the calculation of the equipment heat load Q2: the technical solution is provided with a pyroelectric infrared heat sensing module 12, which can sense the startup or shutdown information of the equipment in the venue. Since the power of the equipment is known, the operating power of the equipment in the venue can be directly obtained, and the equipment heat load Q2 is calculated as the operating power of the equipment in the venue*0.8, and the equipment heat load Q2 in the venue is obtained;

[0058] Regarding the calculation of human body heat load Q3: the human body sensing module 13 is used to sense the number of people in the venue, and calculate the human body heat load Q3 based on the number of people in the venue. Under normal conditions, the human body heat load of an adult male in a day is 10,000 joules, i.e. 0.1W, while in the working state, based on the labor intensity, the human body heat load power of a single person is 0.2-0.4W. The value of the human body heat load Q3 is calculated by the number of people in the venue * the heat load power of a single person;

[0059] By integrating the site heat load Q1, equipment heat load Q2 and human body heat load Q3, the total heat load Qt in the venue at that moment is calculated, and then the total heat load Qt / time curve is generated.

[0060] Furthermore, the energy consumption of a single MAU fresh air unit power switching is the average of several groups of switching MAU fresh air unit power switching energy consumption data in the database.

[0061] The database records several groups of MAU fresh air unit power switching energy consumption data, calculates the average of the MAU fresh air unit power switching energy consumption, and estimates the energy consumption when the next MAU fresh air unit power switching is executed. At the same time, the actual energy consumption of the next MAU fresh air unit power switching is monitored and recorded, so as to add the energy consumption data to the database. As the database information increases, the system estimates the energy consumption of the next MAU fresh air unit power switching more accurately.

[0062] About P 损失 Calculation: According to the estimated switching energy consumption, the proportion of total energy consumption is equal to P 损失Equal to the power ratio of the MAU fresh air unit, and then calculate the switching energy consumption power P 损失 .

[0063] Furthermore, when ΔP is a negative value, the output control module 4 directly performs regulation; when ΔP is a positive value, and ΔP is equal to P 损失 The difference between the difference of ΔP and P is positive, and the output control module 4 performs regulation; when ΔP is positive, and ΔP is equal to P 损失 If the difference of the difference is a negative value, the output control module 4 does not perform regulation.

[0064] Furthermore, when executing regulation, the output control module 4 switches the power of the MAU fresh air unit to be equal to the total heat load Qt.

[0065] like Figure 3-5 As shown in the figure, multiple groups of total heat load Qt line and MAU fresh air unit cooling power line are shown respectively. Figure 3 Under ideal conditions, the total heat load Qt line and the MAU fresh air unit cooling power line are always close (approximately equal) and linearly consistent. In this case, it can be understood that the MAU fresh air unit cooling power is always the ideal optimal power. In this case, △P approaches 0, and △P is much smaller than P 损失 , so there is no need to switch the cooling power of the MAU fresh air unit; Figure 4 The cooling power line of the MAU fresh air unit in the figure is below the total heat load Qt. At this time, △P is less than 0, which is a negative value, indicating that the cooling power of the MAU fresh air unit cannot meet the cooling demand in the venue. At this time, the cooling power of the MAU fresh air unit is directly adjusted to make the cooling power of the MAU fresh air unit equal to the heat load Qt. Figure 5 The cooling power line of the MAU fresh air unit in the figure is above the total heat load Qt line. At this time, △P is a positive value. By comparing △P with P 损失 , so as to determine whether to adjust the cooling power of the MAU fresh air unit. Specifically, in the L1 section of the figure, △P is less than P 损失 , which means that the benefit of regulation is less than the energy consumption during regulation. At this time, there is no need to adjust the cooling power of the MAU fresh air unit. In the L2 section of the figure, △P is greater than P 损失 At this time, it means that the benefit of regulation is greater than the energy consumption generated during the regulation process, and the energy saved is greater than the loss during the regulation process. The cooling power of the MAU fresh air unit is directly adjusted, and the intersection of the L1 section and the L2 section is the regulation point;

[0066] However, in actual production and use scenarios, in theory, the cooling power line of the MAU fresh air unit is completely consistent with the total heat load Qt line, and the cooling capacity of the MAU fresh air unit is the most reasonable. However, in actual use, in order to ensure that the cooling capacity of the MAU fresh air unit is sufficient, the cooling power of the MAU fresh air unit is preferably slightly larger than the total heat load Qt, that is, the cooling power line of the MAU fresh air unit is located parallel to the total heat load Qt line, and the distance between the two is kept very low, which can eliminate and compensate for part of the calculation or environmental heat dissipation errors and ensure that the cooling capacity delivered can fully meet the needs of the site; and because the energy consumption of the MAU fresh air unit when switching the feeding power exists in a short period of time, the gain power of the MAU fresh air unit after the cooling power is switched has the possibility of long-term benefit, so even if the ratio △P is less than P 损失 , it only needs to maintain a long-term stable state after regulation, and it can also save energy and reduce consumption to a certain extent. However, this situation does not meet the above-mentioned realistic scenario requirements that the cooling power of the MAU fresh air unit should be slightly greater than the total heat load Qt. At the same time, it also greatly increases the switching frequency of the MAU fresh air unit, which in turn affects the service life of the MAU fresh air unit. Because, although in this unique environment, executing switching can save energy and reduce consumption to a small extent, this situation is not considered in actual applications.

[0067] Working principle: The total heat load Qt in the venue is calculated in real time through the calculation module 3, and the total heat load Qt / time curve is generated, and the total heat load Qt / time curve is compared with the cooling power / time curve of the MAU fresh air unit, and then the cooling power of the MAU fresh air unit is regulated; during the regulation process, the profit calculation module 31 generates △P based on the total heat load Qt / time curve and the cooling power / time curve of the MAU fresh air unit, and calculates P through the database information 损失 , so as to more accurately determine the switching node of the MAU fresh air unit, so that the system can save energy and reduce consumption as much as possible, ensure that the cooling capacity pumped by the MAU fresh air unit fully meets the needs of the site, and have a better use effect.

[0068] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present invention and features of different embodiments or examples without contradiction.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. MAU fresh air unit energy-saving control system, characterized by: It includes a plurality of detection modules arranged in the same place as the air supply ports of the fans; a communication transmission module electrically connected to the plurality of detection modules and transmitting the information of the detection modules backward; a calculation module for receiving the information of the communication transmission modules and calculating the air supply volume and the air supply temperature and humidity based on the information; an output control module for receiving the calculation result of the calculation module and controlling the cooling power of the fans based on the result; The detection module includes a temperature and humidity sensing module, a pyroelectric infrared thermal sensing module and a human body sensing module for sensing the temperature and humidity in the venue. The temperature and humidity sensing module transmits the temperature and humidity information in the venue in real time through the communication transmission module. The pyroelectric infrared thermal sensing module and the human body sensing module respectively sense the equipment and personnel information in the venue. The calculation module calculates the total heat load Qt in the site based on the data of the detection module, and controls the cooling power of the fan accordingly; the calculation module also includes a benefit calculation module, and before controlling the change of the cooling power of the fan, the benefit calculation module calculates the benefit of the regulation and controls whether the regulation is executed or not.

2. The MAU fresh air unit energy-saving control system according to claim 1 is characterized in that: The benefit calculation module is provided with a database, which records the energy consumption of power switching of several groups of MAU fresh air units. The benefit calculation module calculates the energy consumption of a single MAU fresh air unit power switching based on the database information.

3. The MAU fresh air unit energy-saving control system according to claim 1 is characterized in that: The human body sensing module is selected from an identity card, a reader or an infrared human body sensing device.

4. The control method of the MAU fresh air unit energy-saving control system according to claim 1 is characterized in that: The following steps are involved: S1, obtaining the equipment information and personnel information in the venue in sequence through the detection module, and transmitting the equipment information and personnel information to the calculation module; S2, the calculation module calculates the total heat load Qt (unit W) based on the detection module information and generates a total heat load Qt / time curve; S3, regenerate the cooling power / time curve of the MAU fresh air unit on the total heat load Qt / time curve, and calculate the difference △P between the total heat load Qt / time curve and the cooling power / time curve of the MAU fresh air unit based on the two; S4, the benefit calculation module calculates the power switching power P of a single MAU fresh air unit based on the energy consumption of a single MAU fresh air unit power switching. 损失 , and compare the calculated △P and P 损失 The difference between S5, based on the results of S3 and S4, the output control module chooses or does not choose to regulate the cooling power of the MAU fresh air unit.

5. The MAU fresh air unit energy-saving control method according to claim 4 is characterized in that: The total heat load Qt is equal to the sum of the site heat load Q1, the equipment heat load Q2 and the human body heat load Q3.

6. The MAU fresh air unit energy-saving control method according to claim 5 is characterized in that: The site heat load Q1 = site area S* unit area heat load index P* correction coefficient C.

7. The MAU fresh air unit energy-saving control method according to claim 5 is characterized in that: The equipment heat load Q2=site equipment operating power*0.8, and the human body heat load Q3=site personnel number*human body heat load power.

8. The MAU fresh air unit energy-saving control method according to claim 4 is characterized in that: The energy consumption of a single MAU fresh air unit power switching is the average of several groups of MAU fresh air unit power switching energy consumption data in the database.

9. The MAU fresh air unit energy-saving control method according to claim 4 is characterized in that: When ΔP is a negative value, the output control module directly performs regulation; when ΔP is a positive value, and ΔP is equal to P 损失 If the difference of the difference is a positive value, the output control module performs regulation; When △P is positive, and △P and P 损失 If the difference of the difference is a negative value, the output control module does not perform regulation.

10. The MAU fresh air unit energy-saving control method according to claim 9 is characterized in that: When executing regulation, the output control module switches the power of the MAU fresh air unit to be equal to the total heat load Qt.

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