Air handling system and method of controlling the same

Abstract

The application discloses an air treatment system and a control method thereof, and belongs to the technical field of air treatment. The air treatment system comprises an air conditioner and a fresh air machine. The control method comprises collecting and processing data of a set temperature, a wall surface average temperature and a consumed power in a period of time to obtain a relationship between the wall surface average temperature and the consumed power under the same set temperature and an average consumed power. A change rate of the consumed power relative to the average consumed power is calculated according to the wall surface average temperature and the set temperature at a current moment. Whether the change rate of the consumed power is not less than a preset change rate is judged. If yes, an energy-saving mode is entered. Otherwise, a current state is kept. The application can achieve the energy-saving effect under the premise of guaranteeing necessary air supply.

Description

Technical Field

[0001] This application relates to the field of air handling technology, and in particular to an air handling system and its control method. Background Technology

[0002] With the vigorous promotion of near-zero energy buildings, the building load itself has been significantly reduced. Combined with improved building airtightness, this necessitates the use of fresh air systems in near-zero energy buildings. As the building load itself decreases, the proportion of fresh air load increases, leading to high system air conditioning energy consumption. Summary of the Invention

[0003] This application provides an air handling system and its control method, which can achieve energy saving while ensuring the necessary air supply volume.

[0004] In one aspect of this application, a control method for an air handling system, the air handling system including an air conditioner and a fresh air unit, the control method comprising: Data processing: Collect and process data on set temperature, average wall temperature, and power consumption over a recent period to obtain the relationship between average wall temperature and power consumption at the same set temperature, and to obtain the average power consumption. Calculate the rate of change of power consumption: Calculate the rate of change of power consumption relative to the average power consumption based on the current average wall temperature and the set temperature; Energy saving judgment: Determine whether the rate of change of power consumption is not less than the preset rate of change. If so, enter the energy saving mode; otherwise, maintain the current state.

[0005] In some embodiments, in the energy-saving mode, it is determined whether the indoor CO2 concentration is less than a first preset concentration value. If yes, then proceed to step one: reduce the fresh air volume; if no, then proceed to step two: reduce the fresh air volume by a smaller reduction in air volume than in step one.

[0006] In some embodiments, after step two, it is further determined whether the indoor CO2 concentration is less than the second preset concentration value. If so, step one is entered and the fresh air volume is reduced in the manner of reducing the air volume in step one. If not, the set temperature is increased. The second preset concentration value is greater than the first preset concentration value.

[0007] In some embodiments, in step one, the fresh air volume G is adjusted according to the following formula: G = G0 (mN)

CO2

CO2

CO2

[0008] In some embodiments, after step one or increasing the set temperature, the process returns to the step of calculating the power change rate at preset intervals; each time it returns, m and n decrease by a preset amount.

[0009] In some embodiments, when the set temperature rises to the preset temperature value, if the rate of change of power consumption is still not less than the preset rate of change, the fresh air volume is reduced in a manner where the reduction in air volume is greater than that in step one.

[0010] In some embodiments, during the data processing step, the collected data is scatter-distributed and fitted with a curve to obtain the curve equations of the average wall temperature and power consumption at the same set temperature.

[0011] In some embodiments, the method further includes: when a grid demand response signal is received, calculating the fresh air load and the air conditioning load; and allocating response targets for the air conditioning and fresh air units according to the ratio of the fresh air load and the air conditioning load.

[0012] In some embodiments, the method further includes: obtaining the maximum operating frequency of the compressor that satisfies the response target based on the correspondence between energy consumption and compressor over a recent period.

[0013] In another aspect of this application, an air handling system includes an air conditioner and a fresh air unit; a wall temperature detection device for detecting the average temperature of all walls in a room; and a control center for: Collect and process data on set temperature, average wall temperature, and power consumption over a recent period to obtain the relationship between average wall temperature and power consumption at the same set temperature, and to obtain the average power consumption. Calculate the rate of change of power consumption relative to the average power consumption based on the current average wall temperature and the set temperature; When the rate of change of power consumption is not less than the preset rate of change, the energy-saving mode is entered. Attached Figure Description

[0014] Figure 1 A schematic diagram of an air handling system according to some embodiments is shown; Figure 2 A schematic diagram of a refrigerant system for an air conditioner according to some embodiments is shown; Figure 3 A schematic diagram of a fresh air unit according to some embodiments is shown; Figure 4 A schematic diagram of a fresh air unit according to some other embodiments is shown; Figure 5 A schematic diagram of an air handling system according to some embodiments is shown; Figure 6 A block diagram of the control components of an air handling system according to some embodiments is shown; Figure 7 A control flow diagram of an air handling system according to some embodiments is shown.

[0015] In the above diagrams: 100, Air handling system; 200, Air conditioner; 210, Outdoor unit; 213, Compressor; 214, Outdoor heat exchanger; 215, Four-way valve; 216, Outdoor expansion valve; 217, Oil separator; 218, Gas-liquid separator; 220, Indoor unit; 221, Indoor heat exchanger; 222, Indoor expansion valve; 300. Fresh air unit; 310. Heat exchange core; 320. Air supply fan; 330. Exhaust fan; 340. Adsorption wheel; 360. First heat exchanger; 370. Second heat exchanger; 400. Control Center; 410. Memory; 420. Communication Module; 430. Input Unit; 440. Wall Temperature Detection Device; 450. Power Measurement Device; 460. Outdoor Temperature and Humidity Detection Device; 470. Indoor Temperature and Humidity Detection Device; 480. Fresh Air Supply Temperature Detection Device. Detailed Implementation

[0016] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0017] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0020] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1 The air handling system 100 of this application includes an air conditioner 200 and a fresh air unit 300.

[0022] The following is a brief introduction to air conditioners: Reference Figure 1 The air conditioner 200 includes an outdoor unit 210 for performing heat exchange between the refrigerant and the outdoor air; and an indoor unit 220 located in the indoor space for performing heat exchange between the refrigerant and the indoor air.

[0023] In air conditioner 200, the outdoor unit 210 and the indoor unit 220 can be separated. In this case, the outdoor unit 210 is located in the outdoor space, and the indoor unit 220 is located in the indoor space. There can be multiple indoor units 220 for use in places such as shopping malls, office buildings, and factories.

[0024] In other embodiments, the air conditioner 200 can also be an integrated unit, that is, the outdoor unit 210 and the indoor unit 220 are integrated on a single housing. Integrated units are commonly seen in ceiling-mounted installation scenarios. The outdoor unit 210 is connected to the outdoor space through a duct, and the indoor unit 220 is connected to the indoor space through a duct.

[0025] The air conditioner has a refrigerant circuit formed by connecting the outdoor unit 210 and the indoor unit 220 using gas pipes and liquid pipes.

[0026] Reference Figure 2 The outdoor unit 210 may be equipped with components such as a compressor 213, an oil separator 217, a four-way valve 215, an outdoor heat exchanger 214, an outdoor expansion valve 216, and a gas-liquid separator 218, and these components are connected by piping.

[0027] Compressor 213 draws in and compresses the refrigerant, bringing it to a high temperature and high pressure state. Oil separator 217 separates the refrigerant and refrigeration oil discharged from compressor 213. Four-way valve 215 is used to switch the refrigerant flow path between heating mode and regular heating mode. Outdoor heat exchanger 214 is used to perform heat exchange between outdoor air and refrigerant. Outdoor expansion valve 216 is used to reduce the pressure of the refrigerant guided to outdoor heat exchanger 214 in heating mode. Gas-liquid separator 218 is used to separate the refrigerant into gas and liquid components, preventing unevaporated liquid refrigerant from flowing into compressor 213.

[0028] The d-pipe of the four-way valve 215 is connected to the output end of the oil separator 217. The e-pipe and c-pipe of the four-way valve 215 are connected to the outdoor heat exchanger 214 and the indoor unit 220, respectively. The s-pipe of the four-way valve 215 is connected to the input end of the gas-liquid separator 218.

[0029] In cooling mode, the four-way valve 215 guides the refrigerant compressed by the compressor 213 to the outdoor heat exchanger 214, and in heating mode, it guides the refrigerant compressed by the compressor 213 to the indoor heat exchanger 221 of the indoor unit 220.

[0030] The outdoor heat exchanger 214 condenses the refrigerant compressed by the compressor 213 in cooling mode and evaporates the refrigerant depressurized by the indoor unit 220 in heating mode.

[0031] The indoor unit 220 may be equipped with an indoor heat exchanger 221 and an indoor expansion valve 222.

[0032] The indoor heat exchanger 221 is used to perform heat exchange between the refrigerant and the indoor air. In cooling mode, the indoor heat exchanger 221 evaporates the low-pressure liquid refrigerant, and in heating mode, it condenses the high-pressure gaseous refrigerant.

[0033] The indoor expansion valve 222 is used to reduce the pressure of the refrigerant supplied to the indoor heat exchanger 221 in cooling mode.

[0034] The following section describes the operating modes of an air conditioner in conjunction with the refrigerant circuit: Cooling mode: The compressor 213 of the outdoor unit 210 compresses the refrigerant. The refrigerant, which is compressed to a high temperature and pressure, passes through the oil separator 217, which separates the refrigerant from the oil. The refrigerant continues to flow through the four-way valve 215 to the outdoor heat exchanger 214, where the outdoor heat exchanger 214 condenses the refrigerant into a liquid state. The liquid refrigerant then flows through the outdoor expansion valve 216 to the indoor unit 220.

[0035] The indoor expansion valve 222 of the indoor unit 220 depressurizes and cools the liquid refrigerant, and the indoor heat exchanger 221 evaporates the depressurized and cooled liquid refrigerant into a gaseous state. The gaseous refrigerant continues to flow to the outdoor unit 210.

[0036] Gaseous refrigerant flows through the four-way valve 215 of the outdoor unit 210 to the gas-liquid separator 218. The gas-liquid separator 218 separates the refrigerant into unevaporated liquid refrigerant and evaporated gaseous refrigerant. The gaseous refrigerant continues to flow back to the compressor 213.

[0037] In the above-mentioned cooling mode, the refrigerant generated in the indoor heat exchanger 221 exchanges heat with the indoor air, thereby cooling the indoor air.

[0038] Heating mode: The compressor 213 of the outdoor unit 210 compresses the refrigerant. The refrigerant, which is compressed to a high temperature and high pressure, passes through the oil separator 217, which separates the refrigerant from the oil. The refrigerant then flows through the four-way valve 215 to the indoor unit 220.

[0039] The indoor heat exchanger 221 of the indoor unit 220 condenses the refrigerant into a liquid state, and the liquid refrigerant flows to the outdoor unit 210 after passing through the indoor expansion valve 222.

[0040] The outdoor expansion valve 216 of the outdoor unit 210 reduces the pressure and temperature of the liquid refrigerant, and the outdoor heat exchanger 214 evaporates the reduced-pressure and cooled liquid refrigerant into a gaseous state.

[0041] Gaseous refrigerant flows through four-way valve 215 to gas-liquid separator 218. Gas-liquid separator 218 separates the refrigerant into unevaporated liquid refrigerant and evaporated gaseous refrigerant. The gaseous refrigerant continues to flow back to compressor 213.

[0042] In the above heating mode, the refrigerant generated in the indoor heat exchanger 221 exchanges heat with the indoor air, thereby heating the indoor air.

[0043] The following is a brief introduction to fresh air systems: The Fresh Air System 300 is a device that can expel indoor stale air and bring outdoor air into the room.

[0044] In one embodiment of the fresh air unit 300: Refer to Figure 3 The fresh air unit 300 includes a casing, a heat exchange core 310, a blower 320, and an exhaust fan 330. The casing forms the general appearance of the fresh air unit, roughly in the shape of a cuboid. The casing is equipped with a fresh air inlet OA, a supply air outlet SA, a return air outlet RA, and an exhaust air outlet EA. The heat exchange core 310 is located inside the housing and is used to realize heat exchange between indoor air and outdoor fresh air. The casing contains a fresh air duct and an exhaust air duct, which are connected to the heat exchange core 20.

[0045] The fresh air duct connects the fresh air inlet OA and the supply air outlet SA to circulate outdoor fresh air; the exhaust air duct connects the return air outlet RA and the exhaust air outlet EA to circulate indoor air. The supply air fan 320 has its corresponding supply air outlet SA installed in the fresh air duct to force the flow of outdoor fresh air; the exhaust fan 330 has its corresponding exhaust air outlet EA installed in the exhaust air duct to force the flow of indoor air. When the fresh air unit is working, under the action of the supply fan 320 and the exhaust fan 330, the indoor air from the return air vent RA flows through the heat exchange core 310 in the exhaust air duct, and the outdoor fresh air from the fresh air vent OA flows through the heat exchange core 310 in the fresh air duct. The two streams of air exchange heat at the total heat exchange core 310. The indoor air after heat exchange is blown towards the exhaust air vent 14, and the outdoor fresh air after heat exchange is blown towards the supply air vent SA. For example, when the fresh air system is running during the summer cooling period, the outdoor fresh air obtains cooling energy from the indoor air, causing the temperature to drop; when it is running during the winter heating period, the outdoor fresh air obtains heat from the indoor air, causing the temperature to rise. In some applications of fresh air systems, the supply air outlet SA and return air outlet RA are connected to the indoor environment via ducts, while the exhaust air outlet EA and fresh air outlet OA are connected to the outdoor environment via ducts.

[0046] In another embodiment of the fresh air unit 300: based on the previous embodiment, an adsorption material and a refrigeration system are combined to enable the fresh air unit 300 to regulate the sensible and latent heat loads of the fresh air. Its working principle mainly involves adjusting the adsorption inlet temperature through the evaporator of the refrigeration system, and using the condenser of the refrigeration system to dissipate heat, thereby regenerating the adsorption material and achieving continuous adsorption and desorption of the adsorption material.

[0047] Fresh air systems generally come in two structural forms: one is a rotary structure, where the adsorption material is embodied in the form of a rotary wheel, and the rotation of the wheel realizes the alternation of adsorption and regeneration; the other is a duct switching structure, where the adsorption material is fixed, and the fresh air duct and exhaust air duct are constantly switched to realize the alternation of adsorption and regeneration.

[0048] The following is a brief explanation of the structure of the 300 fresh air unit, using a rotary type fresh air unit as an example: Reference Figure 4 The fresh air unit 300 includes an adsorption rotor 340, a portion of which is located in the fresh air duct and the other portion is located in the exhaust air duct.

[0049] The first heat exchanger 360 is installed in the fresh air duct and located on the windward side of the adsorption rotor 340. The second heat exchanger 370 is installed in the exhaust air duct and located on the windward side of the adsorption rotor 340.

[0050] The fresh air unit 300 has a refrigeration system, the structure of which is the same as that of an air conditioner. The first heat exchanger 360 and the second heat exchanger 370 correspond to the outdoor heat exchanger and indoor heat exchanger in the air conditioner's refrigeration system, respectively.

[0051] In dehumidification mode, the first heat exchanger 360 acts as an evaporator, which lowers the temperature of the fresh air. The adsorption wheel 340 absorbs the moisture in the fresh air, so that the fresh air is dehumidified and sent into the room. The second heat exchanger 370 acts as a condenser, which heats the exhaust air, thereby regenerating the adsorption wheel 340.

[0052] In humidification mode, the second heat exchanger 370 acts as an evaporator, which lowers the exhaust air temperature. The adsorption wheel 340 absorbs the moisture from the exhaust air, while the first heat exchanger 360 acts as a condenser, which heats the fresh air. This causes the moisture absorbed by the adsorption wheel 340 to be released, thus humidifying the fresh air.

[0053] The following will describe the signal flow between the components contained in the air handling system.

[0054] Reference Figure 5 and Figure 6 The control center 400 is used to receive the detection data of the air conditioner 200 and the fresh air unit 300, and then control the operation of the air conditioner 200 and the fresh air unit 300 after performing calculations.

[0055] Memory 410 is used to store programs and data related to the operation of the air handling system; memory 410 may be non-volatile memory (e.g., cache, read-only memory (ROM), programmable ROM (PROM), erasable programmable ROM (EPROM), and flash memory), volatile memory (e.g., random access memory (RAM)), or such as hard disk drive (HDD) and CD. It may be implemented in at least one of the storage media of ROM, but is not limited thereto.

[0056] The communication module 420 is used to realize communication between the control center 400 and the air conditioner 200, and between the control center 400 and the fresh air unit 300; for example, the temperature and humidity detection information of the air conditioner 200 and the fresh air unit 300 can be shared with the control center 400 through the communication module 320.

[0057] The communication module 420 can be either wired or wireless communication. Wireless communication can use fifth-generation (5G) mobile communication, Long Term Evolution (LTE), or LTE-Advanced (LTE-W) as cellular communication protocols. A) At least one of Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), Universal Mobile Telecommunications System (UMTS), Wireless Broadband (WiBro), or Global System for Mobile Communications (GSM); Additionally, wireless communication may include local communication, which may include at least one of Wireless Fidelity (WiFi), Bluetooth, or Near Field Communication (NFC); ​​wired communication may include Universal Serial Bus (USB), High Definition Multimedia Interface (HDMI), or Recommended Standard 232 (RS). 232) or at least one of the following: Ordinary Old-Style Telephone Service (POTS).

[0058] The input unit 430 can receive input from a user and may include a push-button switch, membrane switch, or touch panel for receiving operating commands for the air handling system. Specifically, the input unit may receive the indoor set temperature Tset from the user.

[0059] A wall temperature detection device 440 can be installed on the walls of a room to detect the average temperature Tbi of all walls in the room. For example, the wall temperature detection device 440 can be an infrared sensor.

[0060] A power measuring device 450, which may be disposed between the air conditioner and the power supply, and between the fresh air unit and the power supply, is used to detect the power consumption of the air handling system. For example, the power measuring device 450 may be a power meter.

[0061] The outdoor temperature and humidity detection device 460 can be installed at the air inlet of the outdoor unit or the fresh air inlet of the fresh air unit to detect the temperature and humidity of the outdoor air.

[0062] The indoor temperature and humidity detection device 470 can be installed at the air inlet of the indoor unit or the return air inlet of the fresh air unit to detect the temperature and humidity of the indoor air.

[0063] The fresh air supply temperature detection device 480 can be installed at the air outlet of the fresh air unit to detect the supply air temperature of the fresh air unit.

[0064] The following section describes control methods for achieving energy savings in air handling systems.

[0065] In some embodiments of this application, reference is made to Figure 7 The control methods for air handling systems include: S1. Collect and process historical data on set temperature, average wall temperature, and power consumption to establish the relationship between the three.

[0066] In step S1, the control center accumulates and records the following data for each hour of each day over the past week: indoor set temperature Tset, average wall temperature Tbi, and power consumption Wi, and processes this data to find the correlation between the data.

[0067] After data collection is completed, the data is classified and processed: it is classified according to different set temperatures Tset, and the data of average wall temperature Tbi and power consumption Wi under the same set temperature Tset are matched.

[0068] For example, the categorized data includes data group 1: the correspondence between different average wall temperatures Tbi ​​and power consumption Wi at Tset=26℃; data group 2: the correspondence between different average wall temperatures Tbi ​​and power consumption Wi at Tset=27℃; data group 3: the correspondence between different average wall temperatures Tbi ​​and power consumption Wi at Tset=28℃, and so on.

[0069] Data set 1:

[0070] Data set 2:

[0071] After the data is classified, each group of data is processed separately: The average power consumption in each data set is used to obtain the basic power consumption W0.

[0072] By scattering each set of data, the fitted curve equation for the scatter points at the same set temperature is obtained, for example: Wi=A×Tbi 2 +B×Tbi+C. A is the coefficient of the quadratic term in the equation, B is the coefficient of the linear term, and C is the constant in the equation.

[0073] In other embodiments, if the current average wall temperature Tbi is in the table, the corresponding power consumption Wi can be obtained directly from the table; if the current average wall temperature Tbi is not in the table, the power value can be obtained by assuming that it is located on the straight line connecting two adjacent data points.

[0074] Since the impact of fresh air load on the indoor environment is first reflected on the walls before gradually manifesting in the indoor air, this application can predict changes in indoor temperature in advance by detecting the average wall temperature, thereby enabling subsequent energy-saving operations to be carried out earlier. Compared with the monitoring of indoor temperature in the prior art, this application is more energy-efficient.

[0075] S2. Calculate the rate of change of power consumption Wi based on the current average wall temperature Tbi and the set temperature.

[0076] In step S2, when the average wall temperature Tbi changes, the indoor load will change. Based on the relationship between the average wall temperature Tbi and the power consumption Wi at the same set temperature, the change in power consumption Wi can be predicted in advance, and the rate of change of power consumption can be calculated as: Xi = (Wi - W0) / W0.

[0077] S3. Determine whether the rate of change of power consumption is not less than the preset rate of change. If so, enter the energy-saving mode; otherwise, maintain the current state and do not enter the energy-saving mode.

[0078] For example, the preset change rate is 10%. If the change rate Xi ≥ 10%, it means that the energy consumption of the system will increase. At this time, the energy consumption can be reduced by the energy saving of the fresh air unit. If the change rate is less than 10%, it means that the energy consumption of the system will not change much or will decrease in the next moment, and the energy saving of the fresh air unit is not needed to reduce the energy consumption.

[0079] The specific steps of the energy-saving mode include: S11, determining whether the indoor CO2 concentration is less than the first preset concentration value; if so, proceed to step S12 (step one): reduce the fresh air volume; otherwise, proceed to step S13 (step two): reduce the fresh air volume by a lesser degree than in step one. The reduction in fresh air volume can be achieved by controlling the fan speed.

[0080] For example, the first preset concentration value is 0.1%. If the indoor CO2 concentration is less than 0.1%, it means that the indoor air quality is relatively good, and a smaller amount of fresh air can meet the user's needs. Therefore, under this condition, reducing the amount of fresh air will not cause discomfort to the user, and can also reduce the energy consumption of the fresh air unit, thus achieving the purpose of energy saving.

[0081] If the indoor CO2 concentration is not less than 0.1%, it means that a certain amount of fresh air is needed to reduce the indoor CO2 concentration. In this case, the fresh air volume can be reduced slightly so that the system energy consumption will not increase too much.

[0082] After step two, after a period of time, proceed to S14 to determine whether the indoor CO2 concentration is less than the second preset concentration value. If so, return to step one in S12 and reduce the fresh air volume according to the air volume reduction method in step one. If not, proceed to S15 to increase the set temperature.

[0083] The second preset concentration value is greater than the first preset concentration value. For example, the second preset concentration value is 0.15%, and the second preset concentration value can be the upper limit of the allowable indoor CO2 concentration.

[0084] If the indoor CO2 concentration is less than 0.15%, it means that the indoor CO2 concentration is within an acceptable range. In this case, the fresh air volume can be further reduced to reduce energy consumption. If the indoor CO2 concentration is not less than 0.15%, it means that the indoor demand for fresh air is more urgent and energy saving cannot be achieved by reducing the fresh air volume. In this case, the system's energy consumption can be reduced by increasing the set temperature.

[0085] In some embodiments, in step one, the fresh air volume G can be adjusted according to the following formula: G=G0(mN)

CO2

CO2

CO2

[0086] In some embodiments, after S12 or S15, S2 is returned after a preset time interval N, and each time it is returned, m and n decrease by a preset amount.

[0087] When the loop is interrupted and the power-saving mode is re-entered, m and n return to their initial values.

[0088] For example, the value of m decreases by 6% and the value of n decreases by 5% in each cycle. i n i This represents the current values ​​of m and n, where m i-1 n i-1 This represents the values ​​of m and n in the previous iteration.

[0089] After S12 or S15, after an interval of N minutes, return to S2 to reassess the power change rate. If the power change rate meets the conditions for re-entering the energy-saving mode, and if the values ​​of m and n are fixed, the fresh air volume will be the same as the fresh air volume at the previous moment, failing to achieve the purpose of reducing the fresh air volume. Therefore, m and n need to be variable numbers to ensure that the fresh air volume decreases in each cycle, thereby meeting the energy-saving requirements.

[0090] In some embodiments, when the set temperature Tset rises to the preset temperature value, if the rate of change of power consumption is still not less than the preset rate of change, the fresh air volume is reduced in a manner where the reduction in air volume is greater than that in step one.

[0091] In this step, the fresh air volume can be reduced according to the preset ratio (<1) of the current air volume.

[0092] For example, the preset temperature value is 28℃ and the preset multiplier is 50%. When Tset ≥ 28℃ and Xi ≥ 10%, the fresh air volume is directly reduced to 50% of the current air volume.

[0093] If the system still consumes relatively high power when the set temperature Tset reaches 28℃, it means that energy saving cannot be achieved by increasing the set temperature. In this case, energy saving can only be achieved by significantly reducing the fresh air volume.

[0094] In some embodiments, S31, when a grid demand response signal is received, the fresh air load and air conditioning load are calculated; S32, the response targets of the air conditioning and fresh air units are allocated according to the ratio of the fresh air load and the air conditioning load.

[0095] In this step, the indoor set enthalpy value can be obtained from the indoor set temperature and humidity, the outdoor enthalpy value can be obtained from the outdoor air temperature and humidity, and the fresh air load can be obtained from the indoor set enthalpy value, the outdoor enthalpy value, and the fresh air volume. The air conditioning load can be obtained from the air conditioning cooling capacity / cooling efficiency.

[0096] Calculate the ratio of fresh air load to air conditioning load, and then allocate the response target according to the ratio. For example, the air conditioning unit may undertake E% of the response target, and the fresh air unit may undertake F% of the response target.

[0097] S33. Based on the correlation between energy consumption and compressor operating frequency over a recent period, obtain the maximum operating frequency of the compressor that meets the demand response.

[0098] In this step, real-time data on the compressor operating frequency and energy consumption of the air conditioner and the fresh air unit over the past 7 days are collected. Then, based on their respective response targets, the maximum operating frequency of the air conditioner compressor and the maximum operating frequency of the fresh air unit compressor can be obtained.

[0099] The compressor's target operating frequency = maximum operating frequency - preset value.

[0100] For air conditioning systems: S41. Set the air conditioner's temperature setting within the range of [T1, T2]. For example, T1 = 27℃, T2 = 29℃.

[0101] S42. Determine whether the indoor temperature Tin < T3 is true, T1 < T3 < T2, for example, T3 = 28℃; if true, the air conditioner compressor will reduce its frequency by AHz, for example, A = 6Hz; if not true, and still not true within the preset time, then turn off the fresh air unit.

[0102] In this step, if the indoor temperature is <28℃, it means that the indoor temperature is suitable, and the frequency can be reduced to further save energy.

[0103] If the indoor temperature fails to decrease over a period of time, the fresh air system should be turned off to reduce the impact of the fresh air load on the indoor temperature and ensure that the indoor temperature remains within the set range.

[0104] S43. Determine whether the indoor temperature Tin < T1 is true; if true, the air conditioner compressor frequency is reduced by BHz, for example, B = 15Hz; if not true, and still not true within the preset time, the fresh air unit is turned off.

[0105] If the indoor temperature is less than T1℃, it means that the indoor temperature is lower than the set temperature. The compressor can maintain the indoor temperature by running at a lower frequency.

[0106] S44. Determine whether the indoor temperature Tin > T2 is true; if true, increase the frequency of the air conditioner compressor, and the frequency of the compressor after the frequency increase cannot exceed the maximum operating frequency.

[0107] Return to S42 for reassessment every 15 minutes.

[0108] For fresh air systems: S51. Determine whether the supply air temperature Tsa > T2 of the fresh air unit is true; if so, reduce the fresh air volume according to the following formula; increase the frequency of the compressor of the fresh air unit.

[0109] G=G0(αN)

CO2

[0110] In this step, if the supply air temperature is higher than the upper limit of the set temperature, the fresh air supplied to the room will cause the indoor temperature to rise. In this case, the fresh air volume can be reduced to reduce the impact of the fresh air on the indoor temperature.

[0111] S52. After S51, at a preset time interval, such as 10 minutes, re-determine whether the supply air temperature Tsa > T3 is true; if so, reduce the fresh air volume according to the following formula.

[0112] G=G0(βN)

CO2

[0113] If not, the fresh air volume shall be implemented according to the standard air volume.

[0114] In this step, the supply temperature of the fresh air is reduced compared to S51, but it is still close to the upper limit of the set temperature. At this time, the fresh air volume can be reduced to reduce the energy consumption of the fresh air unit and reduce the fresh air load, thereby reducing the energy consumption of the air conditioner.

[0115] If the supply air temperature Tsa remains greater than T2 for 30 minutes after the compressor frequency is increased, then the fresh air unit should be shut down.

[0116] In this application, the relationship between the average wall temperature and power consumption can be simulated based on recent historical operating data. The power consumption of the system can be predicted from the average wall temperature. When the rate of change of power consumption increases, energy consumption is reduced by decreasing the fresh air volume. At the same time, the reduction of fresh air load will also reduce the energy consumption of the air conditioner, thereby achieving the purpose of energy saving.

[0117] In this application, energy is saved by reducing the fresh air volume when the indoor CO2 concentration meets the comfort requirements, and by increasing the set temperature when the indoor CO2 concentration is high. That is, the energy consumption of the air conditioner will be reduced after the set temperature is increased.

[0118] In this application, a positive correlation is established between CO2 concentration and fresh air volume, so that the adjusted fresh air volume can meet the indoor demand without wasting energy.

[0119] In this application, when responding to grid demand, the response targets for air conditioning and fresh air units are allocated based on the ratio of fresh air load to air conditioning load. The maximum operating frequency of the compressor is calculated based on the response targets, thus achieving a reasonable response to demand.

[0120] 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.

Claims

1. A control method for an air handling system, characterized in that, The air handling system includes an air conditioner and a fresh air unit; The control method includes: Data processing: Collect and process data on set temperature, average wall temperature, and power consumption of the air handling system over the past week to obtain the relationship between average wall temperature and power consumption at the same set temperature, and to obtain the average power consumption; the average wall temperature is the average temperature of all walls in the room. Calculate the rate of change of power consumption: Calculate the rate of change of power consumption relative to the average power consumption based on the current average wall temperature and the set temperature; Energy saving judgment: Determine whether the rate of change of power consumption is not less than the preset rate of change. If so, enter the energy saving mode; otherwise, maintain the current state.

2. The control method for the air handling system according to claim 1, characterized in that, In energy-saving mode, it determines whether the indoor CO2 concentration is less than the first preset concentration value. If so, it proceeds to step one: reduce the fresh air volume; if not, it proceeds to step two: reduce the fresh air volume by a smaller reduction in air volume than in step one.

3. The control method for the air handling system according to claim 2, characterized in that, After step two, continue to determine whether the indoor CO2 concentration is less than the second preset concentration value. If so, proceed to step one and reduce the fresh air volume according to the air volume reduction method in step one; if not, increase the set temperature. The second preset concentration value is greater than the first preset concentration value.

4. The control method for the air handling system according to claim 2 or 3, characterized in that, In step one, the fresh air volume G is adjusted according to the following formula: G = G0 (mN) 【CO2】 -1); In step two, the fresh air volume G is adjusted according to the following formula: G = G0(nN 【CO2】 -1); Where G0 represents standard air volume; N 【CO2】 This indicates the indoor CO2 concentration; m and n are preset values, where m < n.

5. The control method for the air handling system according to claim 4, characterized in that, After step one or increasing the set temperature, return to the step of calculating the power change rate at preset intervals; each time it returns, m and n decrease by a preset amount.

6. The control method for the air handling system according to claim 3, characterized in that, If the power consumption change rate is still not less than the preset change rate when the set temperature rises to the preset temperature value, the fresh air volume will be reduced in the manner that the reduction in air volume is greater than that in step one.

7. The control method for the air handling system according to claim 1, characterized in that, In the data processing step, the collected data is distributed as a scatter plot and fitted with a curve to obtain the curve equations of the average wall temperature and power consumption at the same set temperature.

8. The control method for the air handling system according to claim 1, characterized in that, Also includes: When a grid demand response signal is received, calculate the fresh air load and air conditioning load; The response targets for air conditioning and fresh air units are allocated according to the ratio of fresh air load to air conditioning load.

9. The control method for the air handling system according to claim 8, characterized in that, Also includes: Based on the correlation between energy consumption and compressor performance over the past week, the maximum operating frequency of the compressor that meets the response target is obtained.

10. An air handling system, characterized in that, include: Air conditioners and fresh air systems; A wall temperature detection device is used to detect the average temperature of all walls in a room. Control center, used for: Collect and process data on the average wall temperature detected by the set temperature and wall temperature detection device and the power consumption of the air handling system within the past week to obtain the relationship between the average wall temperature and power consumption at the same set temperature, and to obtain the average power consumption. Calculate the rate of change of power consumption relative to the average power consumption based on the current average wall temperature and the set temperature; When the rate of change of power consumption is not less than the preset rate of change, the energy-saving mode is entered.

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