A variable air volume air conditioner cross-region air conditioner box air outlet air balance debugging method

Abstract

The application discloses a variable air volume air conditioner cross-region air conditioner box air outlet air balance debugging method and relates to the technical field of variable air volume air conditioner debugging, which comprises the following steps: collecting air volume demands of each region served by a variable air volume terminal, obtaining target range values of each region based on regional load calculation, setting an air outlet corresponding to a region with the largest air volume demand as a first air outlet, and setting the rest of the air outlets as second air outlets and subsequent air outlets; operating an air conditioning system, so that the variable air volume terminal is in a maximum opening degree operating state to obtain a maximum air volume reference value; then, adjusting system operating parameters, so that the total air volume of the variable air volume terminal is maintained within the target air volume range of the first air outlet, and initial conditions for subsequent air outlet debugging are formed. The maximum sensible heat load of each region is obtained, and the target air volume range of each region is determined in combination with a design air supply temperature difference, so that the air volume matching is ensured from the source to meet the cooling demand of the region, and the rationality and controllability of air volume distribution are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the variable air volume air conditioning debugging technical field, and particularly to a variable air volume air conditioning cross-region air conditioner box air outlet air balance debugging method. BACKGROUND

[0002] In a variable air volume air conditioning system, a variable air volume terminal can be connected with 4 or 5 air outlets at most. Since there is only one terminal controller in a terminal, when the air outlets connected by the same terminal serve different regions, overcooling or overheating occurs due to different region functions, and the comfort is seriously insufficient. Therefore, when this situation occurs, after completing the air balance debugging, the different air outlets of the same variable air volume terminal need to be balanced and debugged to meet the different air volume requirements of different regions under this condition.

[0003] In actual use of a variable air volume air conditioning project, due to the influence of building layout and use space division, the same variable air volume terminal can serve multiple areas with small area or different use characteristics, such as a printing room, a tea room, a telephone room, etc. The use rate of such areas is low, and the demand is also relatively low. For such areas, the air volume requirements of each region can be balanced as much as possible through air outlet air balance debugging.

[0004] The existing debugging method mainly adjusts the air volume of each air outlet to make the air outlets close to the design air volume value. However, when multiple air outlets under the same terminal serve different functional regions, the air volume will affect each other during the adjustment process, the air volume deviation is difficult to converge, and local temperature fluctuations repeatedly occur, which makes the air volume balance debugging time-consuming and difficult to form a stable result. Therefore, the present application provides a variable air volume air conditioning cross-region air conditioner box air outlet air balance debugging method. SUMMARY

[0005] The present application aims to provide a variable air volume air conditioning cross-region air conditioner box air outlet air balance debugging method to solve the problems mentioned in the background.

[0006] The present application can be implemented by the following technical scheme: a variable air volume air conditioning cross-region air conditioner box air outlet air balance debugging method, comprising the following steps:

[0007] Step 1: Collect the air volume requirements of each region served by the variable air volume terminal, calculate the target range value of each region based on the region load, and set the air outlet corresponding to the region with the largest air volume requirement as the first air outlet, and the remaining air outlets as the second air outlet and subsequent air outlets.

[0008] Step 2: Run the air conditioning system to make the variable air volume terminal operate at the maximum opening degree to obtain the maximum air volume reference value.

[0009] Subsequently, the system operating parameters are adjusted to maintain the total air volume of the variable air volume terminal within the target air volume range of the first air outlet, forming an initial condition for subsequent air outlet debugging;

[0010] Step three, when the target air volume of the first air outlet is greater than the target air volume of the second air outlet, the manual regulating valve of the first air outlet is kept in a fully open state, and the manual regulating valve of the second air outlet is adjusted to reduce the measured air volume of the second air outlet to within the target air volume range thereof;

[0011] Step four, during the adjustment of the second air outlet, the air volume change is monitored in real time, and if the adjustment causes the air volume of the first air outlet to deviate from the target air volume range thereof, the opening degree of the adjusting valve of the second air outlet is readjusted until the measured air volumes of all air outlets meet the corresponding target air volume requirements respectively, and the air balance debugging is completed.

[0012] Further technical improvements of the present application are that in step one, the method for obtaining the target range value of each area includes:

[0013] S1, obtaining the maximum sensible heat load of each area determined in the design stage, and registering the maximum sensible heat load and the design supply air temperature difference corresponding to the area as load conversion basic data;

[0014] S2, performing air volume conversion according to the maximum sensible heat load and the design supply air temperature difference to obtain a target air volume median value for maintaining stable operation of the area under maximum load conditions;

[0015] S3, taking the target air volume median value as the middle value of the target air volume range, and determining the upper limit value of the target air volume range according to the measurement error of the air volume measuring device, the air volume fluctuation amplitude when the system is stably running, and the air pipe conveying deviation;

[0016] S4, determining the minimum allowable supply air volume of the corresponding area according to the minimum fresh air volume or the minimum air change frequency required by the building specification, comparing the minimum allowable supply air volume with the measurement error of the air volume measuring device and the lower limit of the system running fluctuation, and taking the larger value of the two as the lower limit value of the target air volume, so that the lower limit value of the target air volume and the upper limit value of the target air volume constitute the target air volume range value of the area.

[0017] Further technical improvements of the present application are that the step of air volume adjustment in step four includes:

[0018] A1, collecting the length, cross-sectional area, elbow number, branch number and local resistance component information of the corresponding air pipe of the variable air volume terminal, and determining the resistance coefficient of the air pipe according to the actual size of the air pipe;

[0019] In the system running stage, real-time wind speed value and static pressure value in the air pipe are acquired, when the deviation between the real-time static pressure and the theoretical static pressure corresponding to the resistance coefficient exceeds the resistance deviation threshold AR, a resistance compensation value is calculated according to the deviation, which is used for subsequent air volume adjustment;

[0020] A2, the measured air volume of each air outlet is collected, when the air volume of the remaining air outlets changes more than the air volume coupling threshold AQ after adjusting the opening degree of the adjusting valve of any air outlet, it is determined that there is a coupling relationship between the air outlets, and the adjusting order is determined according to the air volume change value from large to small;

[0021] A3, the opening degree of the adjusting valve of the corresponding air outlet is adjusted one by one according to the adjusting order in step A2, when the air volume of other air outlets deviates from the respective target air volume range and the deviation value exceeds the air volume deviation threshold AE, the coupling compensation amount of the corresponding air outlet is recorded, and the adjusting is continued in a way that does not exceed half of the previous adjusting amplitude, so that the air volume gradually approaches the target air volume range;

[0022] A4, in the closed-loop adjusting process, the resistance compensation value is used to correct the target air volume range of each air outlet, when the air pipe resistance increases, the target air volume is corrected to the lower limit of the target air volume, and when the air pipe resistance decreases, the target air volume is corrected to the upper limit of the target air volume;

[0023] A5, when the measured air volume of all air outlets is in the corresponding target air volume range, and the coupling compensation amount is less than the coupling compensation termination threshold AC, the air volume adjustment is ended.

[0024] Further technical improvement of the application is that the debugging method further comprises:

[0025] Q1, air volume collection devices are arranged at the air outlets of each region, temperature collection devices are arranged at multiple space positions in each region, real-time air volume data and multi-point real-time temperature data of each region are acquired at a set sampling period;

[0026] The air volume data and the temperature data in the same sampling period are subjected to time synchronization and sequence processing to form air volume time sequences and temperature matrix sequences of each region, which are used as inputs for subsequent comparison;

[0027] Q2, a preset target air volume range is used as a comparison reference, and the air volume time sequences of each region are compared in intervals within a set comparison period;

[0028] When the number of sampling periods of the air volume time sequence of a region that are outside the target air volume range continuously appears reaches or exceeds the air volume deviation duration threshold, the region is determined to be an unstable air volume region;

[0029] When the air volume deviation duration threshold is not reached, the region is determined to be a stable air volume region;

[0030] Q3, perform continuous sampling comparison on the temperature matrix sequence of each region;

[0031] When the temperature variation amplitude of the same spatial position in continuous multiple sampling periods reaches or exceeds the temperature fluctuation threshold, the spatial position is determined as a temperature fluctuation point;

[0032] When the number of temperature fluctuation points in the same region reaches or exceeds the temperature fluctuation number threshold in the same sampling period, it is determined that the region enters the temperature fluctuation candidate state;

[0033] Q4, for the region in the temperature fluctuation candidate state, perform final determination according to the following rules:

[0034] When the region is determined to be a wind volume stable region in Q2 step, and continuously meets the conditions of temperature fluctuation threshold and temperature fluctuation number threshold in Q3 step, reaches or exceeds the temperature fluctuation duration threshold, the region is determined to be a temperature fluctuation region;

[0035] When the region is determined to be a wind volume unstable region in Q2 step, no temperature fluctuation region conclusion is made, and Q2 step and Q3 step are continued to be executed in the next comparison period, until the temperature fluctuation duration threshold and the wind volume stable condition are met, or until the comparison period ends;

[0036] Q5, for the region meeting the Q4 determination rule, it is determined to be a temperature fluctuation region.

[0037] Further technical improvement of the application is that after determining the temperature fluctuation region, the temperature fluctuation region is compensated based on the adjustable wind volume of the remaining regions, including:

[0038] T1, at the air outlet to which the determined temperature fluctuation region belongs, the current measured wind volume and the corresponding target wind volume range of the air outlet are obtained, and the difference between the target wind volume median and the current measured wind volume is taken as the basic compensation amount;

[0039] T2, the temperature rise amplitude of the temperature fluctuation region in the continuous sampling period is obtained, and the temperature rise amplitude is converted into an additional compensation amount through a preset conversion coefficient, and the basic compensation amount and the additional compensation amount are added to obtain the wind volume compensation demand amount of the temperature fluctuation region;

[0040] T3, in other regions different from the temperature fluctuation region, the current measured wind volume and the corresponding target wind volume range of these regions are obtained, and the difference between the measured wind volume and the lower limit value of the target wind volume is taken as the downwind volume, and the downwind volume is combined according to the region to form the total adjustable wind volume;

[0041] T4, when the total adjustable air volume is greater than or equal to the air volume compensation demand, the regulating valve opening degree of the adjustable region belonging to the same variable air volume terminal as the temperature fluctuation region is adjusted successively, so that the adjusted measured air volume approaches the air volume compensation demand, and the adjustment amplitude is not greater than half of the last adjustment amplitude.

[0042] Further technical improvement of the application is that when the total adjustable air volume is less than the air volume compensation demand, the current measured air volume and the target air volume range of the first air outlet are obtained, if the current measured air volume is higher than the target air volume median and has a downward air volume that is not lower than the target air volume lower limit, the downward air volume of the first air outlet is used to supplement the air volume compensation demand, otherwise the first air outlet is not adjusted.

[0043] Further technical improvement of the application is that the time sequence statistics of the temperature fluctuation region in the continuous operation period are performed, when the occurrence times of the temperature fluctuation region in the same period reach or exceed the preset regularity judgment threshold, the region is determined as a regular temperature fluctuation region.

[0044] After the regular temperature fluctuation region is determined, before the time period corresponding to the temperature fluctuation regularity arrives, the advance air volume compensation adjustment is performed on the adjustable region of the same variable air volume terminal according to the air volume compensation demand, so that the measured air volume of the temperature fluctuation region in the regular time period is between the median and the upper limit of the target air volume range, thereby avoiding temperature fluctuation in the regular time period.

[0045] Further technical improvement of the application is that in the step four, the air volume adjustment process includes:

[0046] R1, before the adjustment of the regulating valve opening degree of the target air outlet is performed, the current measured air volume of all air outlets is recorded as a pre-adjustment air volume state, and the corresponding regulating valve opening degree is recorded as a pre-adjustment opening degree state;

[0047] R2, after the adjustment of the regulating valve opening degree is completed and the system reaches stable operation, the measured air volume of all air outlets is collected as a post-adjustment air volume state;

[0048] R3, the post-adjustment air volume state is compared with the target air volume range of each air outlet, when the measured air volume of any air outlet deviates from the corresponding target air volume range and the deviation exceeds the rollback deviation threshold, it is determined that the current adjustment produces a parameter conflict;

[0049] R4, when it is determined that there is a parameter conflict, the regulating valve opening degree of all air outlets is restored to the opening degree value corresponding to the pre-adjustment opening degree state, so that the measured air volume of each air outlet is restored to the pre-adjustment air volume state;

[0050] R5, after performing the rollback operation, the target air outlet causing the parameter conflict is marked as a conflict air outlet, and the adjustment order of the conflict air outlet is sequentially delayed by one position backward in subsequent debugging, the adjustment order is rearranged, and the air volume adjustment of step four is performed again;

[0051] Compared with the prior art, the present application has the following beneficial effects:

[0052] The present application determines the target air volume range of each area by obtaining the design maximum sensible heat load of each area and combining the design air supply temperature difference, and ensures the air volume matching the cooling demand of the area from the source based on load calculation, thereby improving the rationality and controllability of air volume distribution.

[0053] Furthermore, the present application introduces air pipe resistance compensation, air outlet coupling identification and closed-loop adjustment mechanism in the debugging process, which can monitor the air volume changes of other air outlets when adjusting a single air outlet, and perform step-by-step correction according to the deviation, so that the air volume debugging is in a convergent state, avoiding excessive adjustment and back-and-forth oscillation, thereby improving the debugging efficiency and stability.

[0054] On the other hand, the present application further identifies temperature fluctuation areas using air volume time series and temperature matrix, and performs pre-adjustment on regular fluctuation areas using advance compensation strategy when conventional compensation cannot meet the demand, so that the debugging result has better stability in actual operation, can realize air volume balance under cross-area air supply conditions, and keeps multiple areas within a comfortable temperature range, thereby improving the operation quality of variable air volume systems. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to facilitate understanding of those skilled in the art, the present application will be further described below with reference to the accompanying drawings.

[0056] Figure 1 The method logic diagram of the present application is shown. DETAILED DESCRIPTION

[0057] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific embodiments, structures, features and effects according to the present application are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0058] Example 1

[0059] Please refer to Figure 1 As shown in the drawings, the present application provides a variable air volume air conditioning cross-area air conditioning box air outlet air balance debugging method, which comprises the following steps:

[0060] Step one, collect the air volume demand of each area served by the variable air volume terminal, calculate the target range value of each area based on the area load, set the air outlet corresponding to the area with the largest air volume demand as the first air outlet, and the remaining air outlets as the second air outlet and subsequent air outlets;

[0061] The method for obtaining the target range value of each area comprises:

[0062] S1, obtain the maximum sensible heat load of each area determined in the design stage, and record the maximum sensible heat load and the design supply air temperature difference corresponding to the area as load conversion basic data;

[0063] S2, perform air volume conversion according to the maximum sensible heat load and the design supply air temperature difference to obtain a target air volume median value for maintaining stable operation of the area under maximum load conditions;

[0064] Specifically, the conversion formula is: ;

[0065] In the formula, Q is the target air volume median value;

[0066] L is the maximum sensible heat load of the area;

[0067] is the air density, which is taken according to the commonly used value in engineering;

[0068] c is the constant-pressure specific heat of air, which is taken according to the commonly used value in engineering;

[0069] is the design supply air temperature difference.

[0070] S3, take the target air volume median value as the middle value of the target air volume range, and determine the upper limit value of the target air volume according to the measurement error of the air volume measuring device, the air volume fluctuation amplitude when the system is stably running, and the air pipe conveying deviation;

[0071] Specifically, the measurement error of the air volume measuring device is recorded as 1%-3% of the target air volume median value according to the registered value of the equipment verification certificate;

[0072] The air volume fluctuation amplitude when the system is stably running is the average value of the difference between the maximum value and the minimum value of the air volume of the same air outlet within ten consecutive minutes;

[0073] The air pipe conveying deviation is recorded as 1%-3% of the target air volume median value according to the air pipe static pressure decay value, and the conveying deviation correction amount is taken as 1%-3% of the target air volume median value;

[0074] Add the above three deviation amounts to obtain the upper limit deviation amount of the target air volume, and record "target air volume median value+upper limit deviation amount" as the upper limit value of the target air volume.

[0075] S4, determining the minimum allowable air supply quantity of the corresponding area according to the minimum fresh air quantity or the minimum air change frequency required by the building specification, comparing the minimum allowable air supply quantity with the measurement error of the air quantity measuring device and the lower limit of system operation fluctuation, taking the larger value of the two as the target air quantity lower limit value, and making the target air quantity lower limit value and the target air quantity upper limit value form the target air quantity range value of the area;

[0076] Step two, running the air conditioning system to make the variable air volume terminal be in the maximum opening degree operation state to obtain the maximum air quantity reference value;

[0077] Then, adjusting the system operation parameters to maintain the total air quantity of the variable air volume terminal in the target air quantity range of the first air outlet, forming the initial condition for subsequent air outlet debugging;

[0078] Step three, when the target air quantity of the first air outlet is greater than that of the second air outlet, keeping the manual adjustment valve of the first air outlet in the full open state, and adjusting the manual adjustment valve of the second air outlet to make the measured air quantity of the second air outlet decrease to the target air quantity range thereof;

[0079] Step four, in the process of adjusting the second air outlet, the air quantity change is monitored in real time, if the adjustment causes the air quantity of the first air outlet to deviate from the target air quantity range thereof, the opening degree of the adjustment valve of the second air outlet is readjusted until the measured air quantities of all the air outlets meet the corresponding target air quantity demands respectively, and the air balance debugging is completed.

[0080] Embodiment 2

[0081] A variable air volume air conditioning cross-area air conditioning box air outlet air balance debugging method, comprising the following steps:

[0082] Step one, collecting the air quantity demands of each area served by the variable air volume terminal, obtaining the target range value of each area based on the area load, and setting the air outlet corresponding to the area with the maximum air quantity demand as the first air outlet, and the remaining air outlets as the second air outlet and the subsequent air outlets;

[0083] Step two, running the air conditioning system to make the variable air volume terminal be in the maximum opening degree operation state to obtain the maximum air quantity reference value;

[0084] Then, adjusting the system operation parameters to maintain the total air quantity of the variable air volume terminal in the target air quantity range of the first air outlet, forming the initial condition for subsequent air outlet debugging;

[0085] Step three, when the target air quantity of the first air outlet is greater than that of the second air outlet, keeping the manual adjustment valve of the first air outlet in the full open state, and adjusting the manual adjustment valve of the second air outlet to make the measured air quantity of the second air outlet decrease to the target air quantity range thereof;

[0086] Step four, compared with example 1, the step of air volume adjustment in example 2 includes:

[0087] A1, collect the length, cross-sectional area, elbow number, branch number and local resistance component information of the air pipe corresponding to the variable air volume terminal, determine the resistance coefficient of the air pipe according to the actual size of the air pipe;

[0088] In the system running stage, the real-time wind speed value and static pressure value in the air pipe are obtained, when the deviation between the real-time static pressure and the theoretical static pressure corresponding to the resistance coefficient exceeds the resistance deviation threshold AR, the resistance compensation value is calculated according to the deviation, which is used for subsequent air volume adjustment;

[0089] Specifically, based on design drawings or on-site measurement records during construction or other ways, the length value, cross-sectional size value, elbow number, tee number and local resistance component number of the air pipe corresponding to the variable air volume terminal are obtained, and the above information is recorded in the record table;

[0090] According to the air pipe length value and cross-sectional size value in the record table, the unit length resistance value under the condition of the material and size is obtained based on the preset resistance reference table; when the record value falls between two data, the unit length resistance value is determined by linear interpolation of the adjacent two resistance data;

[0091] For elbows, tees and local components, their equivalent length values are recorded according to the reference table and added to the length of the straight pipe section to form the equivalent total length;

[0092] The unit length resistance value is multiplied by the equivalent total length to obtain the theoretical total resistance value of the air pipe, which is used as the subsequent comparison reference;

[0093] During the air volume debugging process, the real-time wind speed and real-time static pressure in the same sampling period are collected by the wind speed measuring device and the static pressure measuring device arranged in the air pipe;

[0094] The wind speed data is obtained by using the multi-point distribution collection method, and the collected values are subjected to time average processing to obtain the wind speed value in the sampling period;

[0095] The static pressure data is read by a differential pressure gauge and subjected to time average processing to obtain the static pressure value in the sampling period;

[0096] The difference between the theoretical static pressure value corresponding to the wind speed value in the sampling period and the measured static pressure value is compared, when the absolute value of the difference is greater than the preset resistance deviation threshold AR, it is determined that the air pipe resistance has changed, and the difference is used as the resistance compensation value;

[0097] In this embodiment, the value of the resistance deviation threshold AR is determined according to the range error of the pressure measuring device, the installation deviation and the short-time fluctuation of the air path, and is set to 2%-5% of the theoretical static pressure value;

[0098] The positive resistance compensation value indicates that the actual resistance is higher than the theoretical resistance, and the negative resistance compensation value indicates that the actual resistance is lower than the theoretical resistance.

[0099] In the subsequent debugging process, the resistance compensation value is used to correct the target air volume range of the air outlet, so that the air volume adjustment is consistent with the air pipe conveying capacity.

[0100] A2, collect the measured air volume of each air outlet, when the opening degree of the adjusting valve of any air outlet is adjusted, and the air volume of the remaining air outlets changes more than the air volume coupling threshold AQ, it is determined that there is a coupling relationship between the air outlets, and the adjustment order is determined according to the air volume change value from large to small;

[0101] For each air outlet, set up an air volume collection device during the field debugging stage, and record the air volume value before adjustment; then, adjust the opening degree of the adjusting valve of any air outlet according to a fixed opening degree step, keep the system running stably, and then record the air volume value of the remaining air outlets again, and record the air volume difference before and after adjustment as the coupling change value;

[0102] When the coupling change value of any air outlet is greater than the air volume coupling threshold AQ, it is determined that there is a coupling relationship between the air outlet and the adjusted air outlet;

[0103] When there are multiple coupled air outlets, the corresponding coupling change values are sorted according to the value from large to small, and the sorting result is used as the subsequent adjustment order, so as to avoid system shock caused by disordered adjustment.

[0104] A3, adjust the opening degree of the adjusting valve of the corresponding air outlet according to the adjustment order in step A2, when the adjustment causes the air volume of other air outlets to deviate from their respective target air volume ranges and the deviation value exceeds the air volume deviation threshold AE, record the coupling compensation value of the corresponding air outlet, and continue to adjust in a way that does not exceed half of the previous adjustment amplitude, so that the air volume gradually approaches the target air volume range;

[0105] Adjust the valve opening degree of the corresponding air outlet one by one according to the adjustment order determined in step A2, record the adjusted air volume value, and compare it with the respective target air volume;

[0106] When the deviation value is greater than the air volume deviation threshold AE, the excess part is recorded as the coupling compensation value of the air outlet;

[0107] When the next adjustment action is performed, the adjustment amplitude of the adjusting valve opening degree is not greater than half of the previous adjustment amplitude, so that the air volume converges to the target range in a gradually decreasing manner, avoiding excessive correction or back-and-forth shock of the air volume adjustment;

[0108] When the coupling compensation value of a certain air outlet is less than the air volume deviation threshold AE for two consecutive times, it is determined that the air outlet enters a stable state and is not included in the next round of adjustment.

[0109] A4、In the closed-loop regulation process, the resistance compensation value is used to correct the target air volume range of each air outlet. When the air duct resistance increases, the target air volume is corrected to the lower limit of the target air volume. When the air duct resistance decreases, the target air volume is corrected to the upper limit of the target air volume;

[0110] Specifically, the initial target air volume of each air outlet is determined according to the sensible heat load, latent heat load, number of personnel, equipment heat dissipation and fresh air demand of the corresponding area, and the target air volume range is determined according to the indoor temperature and humidity and the temperature difference between the supply air and return air. The target air volume range is composed of a lower limit value and an upper limit value of the target air volume.

[0111] In the closed-loop regulation process, the resistance compensation value obtained in step A1 is used to correct the target air volume. When the resistance compensation value is positive, it means that the actual resistance of the air duct is higher than the theoretical resistance, and at this time the target air volume is moved towards the lower limit. When the resistance compensation value is negative, the target air volume is moved towards the upper limit.

[0112] And in this embodiment, in order to avoid excessive correction amplitude, a three-grade correction rule is adopted, wherein the small-amplitude compensation grade, the medium-amplitude compensation grade and the large-amplitude compensation grade correspond to different resistance deviation intervals, and the moving amplitude is set according to the pre-set debugging data.

[0113] A5、When the measured air volume of all air outlets is within the corresponding target air volume range, and the coupling compensation amount is less than the coupling compensation termination threshold ΔC, the air volume regulation is ended.

[0114] In the process of executing the closed-loop regulation, when the measured air volume of all air outlets is within the target air volume range corrected in step A4, and the coupling compensation amount of all air outlets is less than the coupling compensation termination threshold ΔC, it is determined that the air volume regulation is completed.

[0115] The value of the coupling compensation termination threshold ΔC is determined according to the range error of the air volume measuring device, the maximum fluctuation value during stable operation of the system, and the allowable short-time air volume deviation of the area.

[0116] After the above termination conditions are met, the final opening degree of the regulation valve and the corresponding air volume value of each air outlet are recorded, and the air volume debugging process is ended.

[0117] Embodiment 3

[0118] A variable air volume air conditioning cross-area air conditioning box air outlet air balance debugging method, comprising the following steps:

[0119] Step one, collect the air volume demand of each area served by the variable air volume terminal, calculate the target range value of each area based on the area load, and set the air outlet corresponding to the area with the largest air volume demand as the first air outlet, and the remaining air outlets as the second air outlet and subsequent air outlets;

[0120] Step two, run the air conditioning system, and make the variable air volume terminal operate at the maximum opening state to obtain the maximum air volume reference value;

[0121] Then adjust the system operating parameters to maintain the total air volume of the variable air volume terminal within the target air volume range of the first air outlet, forming the initial conditions for subsequent air outlet debugging;

[0122] Step three, when the target air volume of the first air outlet is greater than that of the second air outlet, keep the manual regulating valve of the first air outlet in the fully open state, and adjust the manual regulating valve of the second air outlet to reduce the measured air volume of the second air outlet to within its target air volume range;

[0123] Step four, during the adjustment of the second air outlet, real-time monitor the air volume changes. If the adjustment causes the air volume of the first air outlet to deviate from its target air volume range, readjust the opening degree of the regulating valve of the second air outlet until the measured air volumes of all air outlets meet their corresponding target air volume requirements, completing the air balance debugging.

[0124] Compared with Embodiments 1 and 2, the debugging method of Embodiment 3 further comprises:

[0125] Q1, set air volume collection devices at each regional air outlet, and set temperature collection devices at multiple space positions within each region, and obtain real-time air volume data and multi-point real-time temperature data of each region according to a set sampling period;

[0126] Perform time synchronization and serialization processing on the air volume data and temperature data within the same sampling period to form air volume time sequences and temperature matrix sequences of each region as inputs for subsequent comparison;

[0127] Q2, take the preset target air volume range as the comparison reference, and compare the air volume time sequences of each region within the set comparison period;

[0128] When the number of sampling periods of the air volume time sequence of a region that are outside the target air volume range continuously appears reaches or exceeds the air volume deviation duration threshold, determine that the region is an air volume unstable region;

[0129] When the air volume deviation duration threshold is not reached, determine that the region is an air volume stable region;

[0130] Q3, perform continuous sampling comparison on the temperature matrix sequences of each region;

[0131] When the temperature variation amplitude of the same space position within continuous multiple sampling periods reaches or exceeds the temperature fluctuation threshold, determine that the space position is a temperature fluctuation point;

[0132] When the number of temperature fluctuation points in the same region reaches or exceeds the temperature fluctuation number threshold in the same sampling period, it is determined that the region enters the temperature fluctuation candidate state;

[0133] Q4, for the region in the temperature fluctuation candidate state, the final determination is performed according to the following rules:

[0134] When the region is determined to be a stable air volume region in the Q2 step, and the conditions of the temperature fluctuation threshold and the temperature fluctuation number threshold are continuously met in the Q3 step, reaching or exceeding the temperature fluctuation duration threshold, the region is determined to be a temperature fluctuation region;

[0135] When the region is determined to be an unstable air volume region in the Q2 step, no conclusion of the temperature fluctuation region is made, and the Q2 step and the Q3 step are continued to be executed in the next comparison period until the temperature fluctuation duration threshold and the stable air volume condition are met, or until the comparison period ends;

[0136] Q5, for the region meeting the Q4 determination rule, it is determined to be a temperature fluctuation region.

[0137] After determining the temperature fluctuation region, the temperature fluctuation region is compensated based on the adjustable air volume of the remaining regions, including:

[0138] T1, at the air outlet to which the determined temperature fluctuation region belongs, the current measured air volume and the corresponding target air volume range of the air outlet are obtained, and the difference between the target air volume median and the current measured air volume is taken as the basic compensation amount;

[0139] T2, the temperature rise amplitude of the temperature fluctuation region in the continuous sampling period is obtained, and the temperature rise amplitude is converted into an additional compensation amount by a preset conversion coefficient. The basic compensation amount and the additional compensation amount are added to obtain the air volume compensation demand of the temperature fluctuation region;

[0140] Specifically, the conversion coefficient is determined as follows:

[0141] First, the rated air supply of the air supply fan, the rated sensible heat treatment capacity of the terminal air treatment unit under the design air supply temperature difference condition, and the design air supply temperature difference are called from the design file of the air conditioning system. The rated sensible heat treatment capacity and the rated air supply form a corresponding relationship to obtain the sensible heat treatment value of the unit air supply under the design air supply temperature difference;

[0142] Subsequently, the heat transfer coefficient and the heated area of the region are called from the building energy saving calculation book. The heat transfer coefficient and the heated area of the enclosure are multiplied and added to the heat introduced by penetration to obtain the sensible heat introduced by the region under the unit temperature rise condition;

[0143] Before performing the air volume compensation calculation, the sensible heat quantity introduced by the temperature fluctuation area under the condition of unit temperature rise is obtained, and the unit air supply quantity sensible heat treatment value of the air supply system under the condition of design air supply temperature difference is obtained. Under the condition of keeping the design air supply temperature difference unchanged, the sensible heat quantity introduced by the unit temperature rise is divided by the unit air supply quantity sensible heat treatment value to form a temperature-air volume conversion coefficient, so that the conversion coefficient reflects the corresponding relationship between temperature rise and air volume compensation, and the conversion coefficient is taken as the conversion basis of the air volume compensation quantity corresponding to the temperature rise amplitude.

[0144] By multiplying the temperature rise amplitude and the conversion coefficient, the additional compensation quantity of the area is obtained.

[0145] Subsequently, the difference between the target air volume median value of the area and the current measured air volume is taken as the basic compensation quantity, and the basic compensation quantity and the additional compensation quantity are added to obtain the air volume compensation demand quantity of the temperature fluctuation area, which reflects the required air supply capacity improvement value for suppressing temperature continuous rise and restoring the area heat balance under the current working condition.

[0146] T3, in other areas different from the temperature fluctuation area, the current measured air volume and the corresponding target air volume range of these areas are obtained, and the difference between the measured air volume and the lower limit value of the target air volume is taken as the reducible air volume, and the reducible air volume is combined according to areas to form the total adjustable air volume;

[0147] T4, when the total adjustable air volume is greater than or equal to the air volume compensation demand quantity, the opening degree of the regulating valve of the adjustable area belonging to the same variable air volume terminal as the temperature fluctuation area is adjusted successively, so that the adjusted measured air volume approaches the air volume compensation demand quantity, and the adjustment amplitude is not greater than half of the last adjustment amplitude.

[0148] And when the total adjustable air volume is less than the air volume compensation demand quantity, the current measured air volume and the target air volume range of the first air outlet are obtained, if the current measured air volume is higher than the target air volume median value and has reducible air volume under the condition of not being lower than the lower limit value of the target air volume, the reducible air volume of the first air outlet is used to supplement the air volume compensation demand quantity, otherwise the first air outlet is not adjusted.

[0149] Subsequently, time series statistics are performed on the number of times, the time period and the duration of temperature fluctuation of the temperature fluctuation area in the continuous operation period, and when the number of times of the temperature fluctuation area in the same period reaches or exceeds the preset regularity judgment threshold, the area is determined as a regular temperature fluctuation area.

[0150] After determining the regular temperature fluctuation area, before the time period corresponding to the temperature fluctuation regularity arrives, the adjustable area of the same variable air volume terminal is executed with advance air volume compensation adjustment according to the air volume compensation demand, so that the measured air volume of the temperature fluctuation area in the regular time period is between the median value and the upper limit of the target air volume range, thereby avoiding temperature fluctuation in the regular time period.

[0151] Specifically, in this embodiment, the real-time temperature data of each space position in the temperature fluctuation area is acquired by the temperature acquisition device, and the temperature change of the area in each sampling period is recorded according to the set sampling period (for example, sampling once every 30 seconds or once every minute);

[0152] When the temperature change amplitude of a space position exceeds the preset temperature fluctuation threshold, the time point is recorded as a temperature fluctuation point;

[0153] The acquired temperature fluctuation points are arranged in time sequence, and the number of temperature fluctuation occurrences in the same time period is counted;

[0154] For each temperature fluctuation area, the number of temperature fluctuations and the specific time period of occurrence in multiple continuous operation periods are counted; the number of temperature fluctuations and the duration of the area in the preset regularity determination period are compared with the preset regularity determination threshold, and if the number of temperature fluctuations in the same period reaches or exceeds the set threshold, the area is determined as a regular temperature fluctuation area;

[0155] After determining that a certain area is a regular temperature fluctuation area, the periodicity and regularity of temperature fluctuation of the area are further determined according to the temperature fluctuation regularity of the area;

[0156] According to the temperature fluctuation period of the area, the specific time period of regular temperature fluctuation is determined, which will be used as a reference window for air volume adjustment;

[0157] For the determined regular temperature fluctuation area, the air volume compensation demand of the area is calculated according to the target air volume range of the area, and the air volume compensation demand calculation formula is as follows:

[0158] The basic compensation amount is the difference between the median value of the target air volume of the area and the current measured air volume;

[0159] The additional compensation amount is obtained by multiplying the temperature rise amplitude of the area in the regular temperature fluctuation time period by a preset conversion coefficient;

[0160] The total compensation demand is obtained by adding the basic compensation amount and the additional compensation amount.

[0161] While determining the regular temperature fluctuation area, the air volume compensation demand of the area is compensated in advance to the VAV terminal to which the area belongs. The specific steps of compensation adjustment are as follows:

[0162] The current measured air volume of the adjustable area of the VAV terminal to which the temperature fluctuation area belongs is obtained;

[0163] The adjustable air volume of the adjustable area (i.e. the difference between the actual air volume and the target air volume range) is calculated, and the total adjustable air volume of the system is formed;

[0164] After determining the compensation demand of the regular temperature fluctuation area, the corresponding air volume is allocated from the adjustable air volume pool to ensure that the measured air volume of the temperature fluctuation area is between the median and the upper limit of the target air volume range before entering the regular fluctuation period.

[0165] After air volume compensation adjustment, the temperature and air volume of the temperature fluctuation area are monitored in real time to ensure that the compensated air volume is stable in the target air volume range;

[0166] If the temperature fluctuation phenomenon of the temperature fluctuation area continues to exist or the air volume has not reached the target range, the air volume compensation demand is further adjusted according to the actually measured data, and the second round of air volume adjustment is carried out until the air volume and temperature of the temperature fluctuation area reach a stable state.

[0167] Embodiment 4

[0168] A VAV air conditioning cross-area air conditioning box air outlet air balance debugging method, comprising the following steps:

[0169] Step 1, collect the air volume demand of each area served by the VAV terminal, calculate the target range value of each area based on the area load, and set the air outlet corresponding to the area with the largest air volume demand as the first air outlet, and the remaining air outlets as the second air outlet and subsequent air outlets;

[0170] Step 2, run the air conditioning system to make the VAV terminal in the maximum opening state to obtain the maximum air volume reference value;

[0171] Then adjust the system operation parameters to maintain the total air volume of the VAV terminal within the target air volume range of the first air outlet, forming the initial condition for subsequent air outlet debugging;

[0172] Step 3, when the target air volume of the first air outlet is greater than that of the second air outlet, keep the manual adjustment valve of the first air outlet in the fully open state, and adjust the manual adjustment valve of the second air outlet to reduce the measured air volume of the second air outlet to within its target air volume range;

[0173] Step four, in the process of adjusting the second air outlet, the air volume change is monitored in real time, if the adjustment causes the air volume of the first air outlet to deviate from its target air volume range, the adjustment valve opening of the second air outlet is re-adjusted until the measured air volume of all air outlets meets the corresponding target air volume requirement respectively, and the air balance debugging is completed.

[0174] Compared with embodiments 1, 2 and 3, embodiment 4 includes the following in the air volume adjustment process in step four:

[0175] R1, before adjusting the adjustment valve opening of the target air outlet, record the current measured air volume of all air outlets as the pre-adjustment air volume state, and record the corresponding adjustment valve opening as the pre-adjustment opening state;

[0176] R2, after completing the adjustment valve opening adjustment and making the system reach stable operation, collect the measured air volume of all air outlets as the post-adjustment air volume state;

[0177] R3, compare the post-adjustment air volume state with the target air volume range of each air outlet, when the measured air volume of any air outlet deviates from the corresponding target air volume range and the deviation exceeds the rollback deviation threshold, determine that the current adjustment causes parameter conflict;

[0178] R4, when it is determined that there is parameter conflict, restore the adjustment valve opening of all air outlets to the opening value corresponding to the pre-adjustment opening state, so that the measured air volume of each air outlet returns to the pre-adjustment air volume state;

[0179] R5, after performing the rollback operation, mark the target air outlet that causes parameter conflict as the conflict air outlet, and delay the adjustment order of the conflict air outlet by one position in the subsequent debugging, rearrange the adjustment order, and perform the air volume adjustment of step four again;

[0180] Wherein, the rollback deviation threshold is determined according to the range error of the air volume measuring device, the system operation fluctuation and the regional allowed short-term deviation, and is 1% to 3% of the median value of the target air volume.

[0181] The above formulas are dimensionless numerical calculations, the formulas are obtained by collecting a large amount of data to simulate the most real situation, and the preset parameters and threshold values in the formulas are set by the person skilled in the art according to the actual situation.

[0182] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A variable air volume air conditioning cross-zone air conditioning box air outlet air balance commissioning method, characterized in that, Comprise: Step one, collect the air volume demand of each area served by the variable air volume terminal, calculate the target range value of each area based on the area load, set the air outlet corresponding to the area with the largest air volume demand as the first air outlet, and the remaining air outlets as the second air outlet and subsequent air outlets; Step two, run the air conditioning system to make the variable air volume terminal operate at maximum opening to obtain the maximum air volume reference value; Then adjust the system operating parameters to maintain the total air volume of the variable air volume terminal within the target air volume range of the first air outlet, forming the initial condition for subsequent air outlet debugging; Step three, when the target air volume of the first air outlet is greater than that of the second air outlet, keep the manual regulating valve of the first air outlet in full open state, and adjust the manual regulating valve of the second air outlet to reduce the measured air volume of the second air outlet to within its target air volume range; Step four, during the adjustment of the second air outlet, the air volume change is monitored in real time, if the adjustment causes the air volume of the first air outlet to deviate from its target air volume range, the opening degree of the adjusting valve of the second air outlet is readjusted until the measured air volume of all air outlets meets the corresponding target air volume demand, and the air balance debugging is completed; The steps of air volume adjustment include: A1, collect the length, cross-sectional area, number of elbows, number of branches and local resistance component information of the air pipe corresponding to the variable air volume terminal, and determine the resistance coefficient of the air pipe according to the actual size of the air pipe; During the system operation stage, the real-time air speed value and static pressure value in the air pipe are obtained, when the deviation between the real-time static pressure and the theoretical static pressure corresponding to the resistance coefficient exceeds the resistance deviation threshold ΔR, the resistance compensation value is calculated according to the deviation, which is used for subsequent air volume adjustment; A2, collect the measured air volume of each air outlet, when the opening degree of the adjusting valve of any air outlet is adjusted, and the air volume change of the remaining air outlets exceeds the air volume coupling threshold ΔQ, it is determined that there is a coupling relationship between the air outlets, and the adjustment order is determined from large to small according to the air volume change value; A3, adjust the opening degree of the adjusting valve of the corresponding air outlet according to the adjustment order in step A2, when the adjustment causes the air volume of other air outlets to deviate from their respective target air volume ranges and the deviation value exceeds the air volume deviation threshold ΔE, record the coupling compensation amount of the corresponding air outlet, and continue to adjust in a way that does not exceed half of the previous adjustment amplitude, so that the air volume gradually approaches the target air volume range; A4, in the closed-loop adjustment process, the resistance compensation value is used to correct the target air volume range of each air outlet, when the air pipe resistance increases, the target air volume is corrected to the lower limit of the target air volume, and when the air pipe resistance decreases, the target air volume is corrected to the upper limit of the target air volume; A5, when the measured air volume of all air outlets is within the corresponding target air volume range, and the coupling compensation amount is less than the coupling compensation termination threshold ΔC, the air volume adjustment is ended. 2.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method according to claim 1, characterized in that, In step one, the method for obtaining the target range value of each area includes: S1, obtain the maximum sensible heat load of each area determined in the design stage, and record the maximum sensible heat load and the design supply air temperature difference of the corresponding area as the load conversion basis data; S2, perform air volume conversion according to the maximum sensible heat load and the design supply air temperature difference to obtain the target air volume median value for maintaining stable operation of the area under maximum load condition; S3, taking the target air volume median value as the middle value of the target air volume range, and determining the upper limit value of the target air volume according to the measurement error of the air volume measuring device, the air volume fluctuation amplitude when the system is stably running, and the air pipe conveying deviation; S4, determining the minimum allowable air supply volume corresponding to the region according to the minimum fresh air volume or the minimum air change frequency required by the building specification, comparing the minimum allowable air supply volume with the measurement error of the air volume measuring device and the lower limit of the system running fluctuation, and taking the larger value of the two as the lower limit value of the target air volume, so that the lower limit value of the target air volume and the upper limit value of the target air volume form the target air volume range value of the region. 3.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method according to claim 1, characterized in that, The debugging method further comprises: Q1, setting air volume collection devices at the air outlets of each region, setting temperature collection devices at multiple space positions inside each region, and obtaining real-time air volume data and multi-point real-time temperature data of each region at a set sampling period; Performing time synchronization and sequence processing on the air volume data and temperature data in the same sampling period to form air volume time sequences and temperature matrix sequences of each region as input for subsequent comparison; Q2, taking the preset target air volume range as the comparison reference, and performing interval comparison on the air volume time sequences of each region within a set comparison period; When the number of sampling periods of the air volume time sequence of a region continuously appearing outside the target air volume range reaches or exceeds the air volume deviation duration threshold, the region is determined as an air volume unstable region; When the air volume deviation duration threshold is not reached, the region is determined as an air volume stable region; Q3, performing continuous sampling comparison on the temperature matrix sequences of each region; When the temperature variation amplitude of the same space position in continuous multiple sampling periods reaches or exceeds the temperature fluctuation threshold, the space position is determined as a temperature fluctuation point; When the number of temperature fluctuation points in the same region in the same sampling period reaches or exceeds the temperature fluctuation number threshold, the region is determined to enter a temperature fluctuation candidate state; Q4, for the region in the temperature fluctuation candidate state, performing final determination according to the following rules: When the region is determined as an air volume stable region in the Q2 step, and continuously satisfies the conditions of the temperature fluctuation threshold and the temperature fluctuation number threshold to reach or exceed the temperature fluctuation duration threshold in the Q3 step, the region is determined as a temperature fluctuation region; When the region is determined as an air volume unstable region in the Q2 step, no conclusion of the temperature fluctuation region is made, and the Q2 step and the Q3 step are continued to be performed in the next comparison period, until the temperature fluctuation duration threshold and the air volume stable condition are satisfied, or until the comparison period ends; Q5, for the region satisfying the Q4 determination rule, determining the region as a temperature fluctuation region. 4.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method according to claim 3, characterized in that, After determining the temperature fluctuation region, the temperature fluctuation region is compensated based on the adjustable air volume of the remaining regions, including: T1, determining the air outlet to which the temperature fluctuation region belongs, obtaining the current measured air volume and the corresponding target air volume range of the air outlet, and taking the difference between the target air volume median value and the current measured air volume as the basic compensation amount; T2, obtaining the temperature rise amplitude of the temperature fluctuation region in a continuous sampling period, and converting the temperature rise amplitude into an additional compensation amount by a preset conversion coefficient, adding the basic compensation amount and the additional compensation amount as the air volume compensation demand of the temperature fluctuation region; T3, in other regions different from the temperature fluctuation region, obtaining the current measured air volume and the corresponding target air volume range of the regions, and taking the difference between the measured air volume and the lower limit of the target air volume as the reducible air volume, and merging the reducible air volume according to the region to form the total adjustable air volume; T4, when the total adjustable air volume is greater than or equal to the air volume compensation demand, the opening degree of the adjustable valve of the adjustable region belonging to the same variable air volume terminal as the temperature fluctuation region is adjusted successively, so that the measured air volume after adjustment approaches the air volume compensation demand, and the amplitude of each adjustment is not greater than half of the last adjustment amplitude. 5.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method of claim 4, characterized in that, When the total adjustable air volume is less than the air volume compensation demand, the current measured air volume and the target air volume range of the first air outlet are obtained, and if the current measured air volume is higher than the median value of the target air volume and has a reducible air volume under the condition of not being lower than the lower limit of the target air volume, the reducible air volume of the first air outlet is used to supplement the air volume compensation demand, otherwise the first air outlet is not adjusted. 6.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method according to claim 5, characterized in that, The time sequence statistics of the number of times, the time period and the duration of the temperature fluctuation of the temperature fluctuation region in a continuous operation period are performed, and when the number of times of the temperature fluctuation region in the same period reaches or exceeds the preset regularity judgment threshold, the region is determined as a regular temperature fluctuation region; After determining the regular temperature fluctuation region, before the time period corresponding to the temperature fluctuation regularity arrives, the advance air volume compensation adjustment is performed on the adjustable regions of the same variable air volume terminal according to the air volume compensation demand, so that the measured air volume of the temperature fluctuation region in the regular time period is between the median value and the upper limit of the target air volume range, thereby avoiding temperature fluctuation in the regular time period. 7.The VAV air conditioning cross-zone air conditioning box air outlet air balance commissioning method according to claim 1, characterized in that, In the step four, the air volume adjustment process includes: R1, before adjusting the opening degree of the target air outlet, the current measured air volume of all air outlets is recorded as the pre-adjustment air volume state, and the corresponding adjustable valve opening degree is recorded as the pre-adjustment opening degree state; R2, after completing the adjustment of the opening degree of the adjustable valve and making the system reach stable operation, the measured air volume of all air outlets is collected as the post-adjustment air volume state; R3, comparing the post-adjustment air volume state with the target air volume range of each air outlet, when the measured air volume of any air outlet deviates from the corresponding target air volume range and the deviation exceeds the rollback deviation threshold, it is determined that the current adjustment causes parameter conflict; R4, when it is determined that there is parameter conflict, the opening degree of the adjustable valve of all air outlets is restored to the opening degree value corresponding to the pre-adjustment opening degree state, so that the measured air volume of each air outlet is restored to the pre-adjustment air volume state; R5, after performing the rollback operation, the target air outlet causing the parameter conflict is marked as a conflict air outlet, and the adjustment order of the conflict air outlet is delayed by one position backward in the subsequent debugging, the adjustment order is rearranged, and the air volume adjustment of step four is performed again.

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