Air volume control method suitable for all-air system and all-air system

Abstract

The invention relates to an air conditioning system, in particular to an air volume control method suitable for an all-air system and the all-air system. The all-air system comprises a controller, an air supply fan and air valves, the number of the air valves corresponds to the number of indoor spaces served by the all-air system, and the controller controls the air supply amount of the indoor spaces by adjusting a first gear of the air supply fan and a second gear of the air valves; the air volume control method does not depend on an air volume sensor and comprises the steps that the total pipeline resistance value of the all-air system is calculated according to the resistance value of a pipeline unit contained in the all-air system; determining a first gear group of operation of the air supply fan according to the static pressure sub range to which the total resistance value of the pipeline of the all-air system belongs; according to the air quantum range to which the total required air volume of the all-air system belongs, determining a first gear for operation of the air supply fan in the first gear group, and enabling the air supply fan to operate according to the fan rotating speed value corresponding to the first gear; and determining a second gear of the corresponding air valve according to the air volume coefficient of the indoor space.

Description

Technical Field

[0001] The invention relates to an air conditioning system, and in particular to an air volume control method suitable for a full air system and a full air system. Background Art

[0002] The full air system delivers the processed air to different indoor spaces through different air supply branches. In order to meet the different needs of different indoor spaces, the full air system needs to control the air supply volume of different branches separately. The existing control methods are as follows: First, calculate the required air volume of each indoor space and add them up to get the total required air volume. Then monitor the actual total air supply volume and compare it with the required air volume. Adjust the speed of the air supply fan to make the actual total air supply volume close to the required air volume. After that, further monitor the actual air supply volume of each air supply branch and compare it with the required air volume of each indoor space. Adjust the opening of the air valves of different branches to make the actual air supply volume of the air supply branch close to the required air volume of the corresponding indoor space.

[0003] This control method relies on the air volume sensor in the duct to monitor the actual total air supply volume and the actual air supply volume of each air supply branch. However, the flow of gas in the duct is uneven, and the data collected by the sensor is prone to large deviations from the actual data. In addition, the relevant sensors are generally costly and short-lived, and the maintenance of the sensors is also inconvenient. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an air volume control method that does not rely on sensors in the pipeline.

[0005] In order to solve the above technical problems, the present invention provides an air volume control method applicable to a full air system, wherein the full air system comprises a controller, an air supply fan, a fresh air fan, an exhaust fan and at least two air valves, wherein the number of air valves corresponds to the number of indoor spaces served by the full air system; the air valves, the fresh air fan, the exhaust fan and the air supply fan are respectively connected to the controller, and the controller controls the air supply volume of the indoor space by adjusting the first gear position of the air supply fan and the second gear position of the air valve; the air volume control method comprises: Step S1: Calculate the total resistance value of the pipelines of the full air system according to the resistance value of the pipeline units contained in the full air system; the resistance value of the pipeline units is determined in advance through testing; Step S2: determining the first gear group for the operation of the air supply fan according to the static pressure sub-range to which the total resistance value of the pipeline of the whole air system belongs; the first gear group corresponds to the static pressure sub-range one by one; the corresponding relationship between the first gear group and the static pressure sub-range is determined in advance through testing; Step S3: determining the first gear of the air supply fan in the first gear group according to the wind quantum range to which the total required air volume of the full air system belongs, so that the air supply fan operates at the fan speed value corresponding to the first gear; in a first gear group, the first gear corresponds to the wind quantum range one by one; the corresponding relationship between the first gear and the wind quantum range, and the corresponding relationship between the first gear and the fan speed value are determined in advance through testing; Step S4: determining the second gear position of the corresponding air valve according to the air volume coefficient of the indoor space; the corresponding relationship between the air volume coefficient and the second gear position is predetermined.

[0006] The designers of the all-air system can calculate the total resistance value of the pipeline, and determine the first gear group of the supply air fan of the all-air system according to the total resistance value of the pipeline. After the all-air system is installed, the controller of the all-air system can make the supply air fan operate in the first gear group, and determine the first gear of the supply air fan according to the total required air volume of the all-air system, and determine the second gear of the air valve according to the air volume coefficient of different indoor spaces. There is no need to rely on the air volume sensor to monitor the real-time air volume, which reduces the cost and maintenance difficulty of the all-air system and improves the stability of the operation of the all-air system.

[0007] Further, before step S1, the air volume control method includes: Step P1: Determine the resistance values ​​of different pipe units through testing. The pipe units are divided into straight pipe units, 90° horizontal bend units, 90° vertical bend units, 45° horizontal bend units, 45° vertical bend units, Y-type three-way units, and T-type three-way units.

[0008] Step P2: Determine through testing the corresponding relationship between the first gear group and the static pressure sub-range, the corresponding relationship between the first gear and the wind sub-range, and the corresponding relationship between the first gear and the fan speed value; Step P2 includes: Step P21: determining a set of air volume values ​​and a set of air outlet static pressure values ​​according to the air volume range and static pressure range of the full air system, wherein the set of air volume values ​​includes a plurality of unequal air volume values, and the set of air outlet static pressure values ​​includes a plurality of unequal air outlet static pressure values; Step P22: for each outlet static pressure value, at the corresponding outlet static pressure, adjust the air volume of the air supply fan to each outlet volume value in turn, and record the fan speed values ​​corresponding to different outlet volume values; Step P23: According to the fan speed value, the air volume range is divided into multiple wind quantum ranges, and the static pressure range is divided into multiple static pressure sub-ranges, so that a fan speed value can be determined based on a wind quantum range and a static pressure sub-range; different static pressure sub-ranges correspond to different first gear groups; different wind quantum ranges correspond to different first gears; for a first gear group, different first gears correspond to different fan speed values.

[0009] Step P23 includes: The air volume values ​​corresponding to the same or similar fan speed values ​​are divided into the same wind sub-range; the air static pressure values ​​corresponding to the same or similar fan speed values ​​are divided into the same static pressure sub-range; two fan speed values ​​are similar when the difference between the two fan speed values ​​is less than 5% of the smaller fan speed value.

[0010] Before step S3, the air volume control method includes: Step P3: Calculate the total required air volume of the full air system. The total required air volume is calculated by adding up the required air volumes of different indoor spaces served by the full air system.

[0011] Before step S4, the air volume control method includes: Step P4: Determine the air volume coefficient of the indoor space according to the air conditioning mode of the indoor space; the corresponding relationship between the air conditioning mode and the air volume coefficient is predetermined.

[0012] The air supply fan of this full air system is an EC fan.

[0013] The present invention also provides a full air system, which includes a controller, a supply air fan, a fresh air fan, an exhaust air fan and at least two air valves, the number of air valves corresponding to the number of indoor spaces served by the full air system; the air valves, fresh air fan, exhaust air fan and supply air fan are respectively connected to the controller, and the air supply volume of the indoor space served by the full air system is controlled by the air volume control method provided by the present invention.

[0014] Further, the all-air system does not include an air volume sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of an all-air system; Figure 2 This is a test diagram of the pipeline unit resistance value. DETAILED DESCRIPTION

[0016] Figure 1 is a schematic diagram of an all-air system, see Figure 1 The full air system includes an indoor unit 1, a sub-air box 2 and an air supply duct 3. The sub-air box 2 is provided with an air valve 21. The number of air valves 21 corresponds to the number of indoor spaces served by the full air system. Different air valves 21 correspond to different indoor spaces. Different air supply ducts 3 lead to different indoor spaces. The wind direction is as follows: Figure 1Indicated by the arrow in the middle. The indoor unit 1 includes a controller and an air supply fan, and the full air system also includes a fresh air fan and an exhaust fan. The air valve 21, the fresh air fan, the exhaust fan and the air supply fan are respectively connected to the controller. The controller controls the air volume of the outdoor fresh air by controlling the speed of the fresh air fan, and controls the exhaust air volume by controlling the speed of the exhaust fan. For example, when purifying the indoor air, the speed of the fresh air fan and the exhaust fan is increased to increase the outdoor fresh air volume and the exhaust air volume.

[0017] Different from the existing air volume control method (the controller controls the indoor air volume by adjusting the speed of the air supply fan and the opening of the air valve according to the data of the air volume sensor), the controller of the full air system controls the indoor air volume by adjusting the first gear of the air supply fan and the second gear of the air valve 21, and does not rely on the air volume sensor. The air volume control method of the full air system includes: Step S1: Calculate the total resistance value of the pipelines of the full air system according to the resistance value of the pipeline units contained in the full air system; the resistance value of the pipeline units is determined in advance through testing; Different apartment types have different numbers, lengths, and directions of the air supply ducts 3 of the full air system, and the total resistance value of the ducts of the full air system is different. According to the different directions, the duct units are divided into straight duct units (i.e., straight ducts with a length of one meter), 90° horizontal bend units, 90° vertical bend units, 45° horizontal bend units, 45° vertical bend units, Y-type three-way units, and T-type three-way units. The resistance values ​​of different duct units can be measured through wind tunnel testing. The full air system contains different duct units (for example, 3 straight ducts, 3 90° vertical bend units, and 1 45° horizontal bend unit). The total resistance value of the ducts of the full air system can be calculated according to the resistance values ​​of different duct units. For straight ducts, the cumulative length value of each straight duct is multiplied by the resistance value of the straight duct unit to calculate the total resistance value a of each straight duct. For other duct units, the corresponding number is multiplied by the resistance value to calculate the total resistance value b of other duct units. The total resistance value of the ducts of the full air system is a+b.

[0018] Step S2: determining the first gear group for the operation of the air supply fan according to the static pressure sub-range to which the total resistance value of the pipeline of the whole air system belongs; the first gear group corresponds to the static pressure sub-range one by one; the corresponding relationship between the first gear group and the static pressure sub-range is determined in advance through testing; The greater the total pipeline resistance value (i.e. the greater the pipeline wind resistance), the higher the first gear group needs to be matched, that is, the speed or power of the air supply fan should be greater to make the outlet air static pressure greater to offset the air volume loss caused by the pipeline resistance.

[0019] Step S3: determining the first gear of the air supply fan in the first gear group according to the wind quantum range to which the total required air volume of the full air system belongs, so that the air supply fan operates at the fan speed value corresponding to the first gear; in a first gear group, the first gear corresponds to the wind quantum range one by one; the corresponding relationship between the first gear and the wind quantum range, and the corresponding relationship between the first gear and the fan speed value are determined in advance through testing; After determining the first gear group corresponding to the all-air system according to the total pipeline resistance value, when the all-air system is running, the controller of the all-air system selects the first gear from the first gear group. The greater the total required air volume, the higher the first gear needs to be selected from the first gear group, that is, the speed or power of the air supply fan needs to be greater to make the air output larger.

[0020] Step S4: determining the second gear position of the corresponding air valve according to the air volume coefficient of the indoor space; the corresponding relationship between the air volume coefficient and the second gear position is predetermined; When the full air system is running, in addition to determining the first gear of the air supply fan to control the total air volume of the indoor unit 1, the controller of the full air system needs to determine the second gear of different air valves 21 according to the air volume requirements of different indoor spaces to control the air supply volume of different indoor spaces; for example: the air valve 21 has five second gears of 0-4 with increasing openings. For the indoor space in service, when the air volume coefficient is less than 1, the air valve 21 is gear 2, when the air volume coefficient is equal to 1, the air valve 21 is gear 3, and when the air volume coefficient is greater than 1, the air valve 21 is gear 4; for the indoor space not in service, when the full air system is in operation, the air valve 21 is gear 1 (to avoid whistling noise from the air valve 21), and when the full air system is not in operation, the air valve 21 is gear 0. Step S4 can be performed before or after step S3.

[0021] Before step S1, the air volume control method includes: Step P1: Determine the resistance values ​​of different pipeline units through testing; The resistance value of the duct unit can be measured by the existing wind tunnel test device. Figure 2 This is a test diagram of the pipeline unit resistance value, see Figure 2 The wind tunnel test device 20 includes a rectifier plate 203, a nozzle 202, a pressure difference measurement module 201, and a variable frequency fan 204. The pipeline unit 10 is connected to the wind tunnel test device 20 for testing. The wind direction is as follows: Figure 2 Indicated by the arrow.

[0022] Step P2: Determine through testing the corresponding relationship between the first gear group and the static pressure sub-range, the corresponding relationship between the first gear and the wind sub-range, and the corresponding relationship between the first gear and the fan speed value; The test can be completed by an existing wind tunnel test device, by connecting the air outlet of the indoor unit 1 to the wind tunnel test device, and adjusting the resistance of the air outlet of the indoor unit 1 by the wind tunnel test device, and the static pressure of the air outlet of the indoor unit 1 corresponds to the resistance. The air supply fan of the full air system is an EC fan, and by adjusting the power of the air supply fan, the air volume or static pressure of the air outlet of the indoor unit 1 can be changed without changing the speed of the air supply fan.

[0023] Step P2 includes: Step P21: According to the air volume range and static pressure range of the full air system, determine a group of air volume values ​​and a group of air outlet static pressure values, the group of air volume values ​​including a plurality of different air volume values ​​(for example: 300CMH, 500CMH, 700CMH, 900CMH, 1000CMH, 1100CMH, 1200CMH, 1300CMH, 1400CMH, 1500CMH, 1600CMH, 1700CMH, 1800CMH, 1900CMH), the group of air outlet static pressure values ​​including a plurality of different air outlet static pressure values ​​(for example: 240Pa, 230Pa, 220Pa, 210Pa, 200Pa, 190Pa, 180Pa, 170Pa, 160Pa, 150Pa, 140Pa).

[0024] Step P22: For each outlet static pressure value, under the corresponding outlet static pressure, adjust the air volume of the air supply fan to each outlet volume value in turn, and record the fan speed values ​​corresponding to different outlet volume values, such as Table 1.

[0025] Table 1 300CMH 500CMH 700CMH 900CMH 1000CMH 1100CMH 1200CMH 1300CMH 1400CMH 1500CMH 1600CMH 1700CMH 1800CMH 1900CMH 240Pa 1550RPM177W 1550RPM164W 1600RPM244W 1600RPM249W 1600RPM247W 1650RPM270W 1700RPM337W 1700RPM343W 1700RPM358W 1750RPM383W 1750RPM395W 1900RPM450W 1950RPM528W 1950RPM532W 230Pa 1500RPM172W 1550RPM146W 1600RPM238W 1600RPM225W 1600RPM237W 1650RPM275W 1650RPM267W 1700RPM325W 1700RPM335W 1750RPM367W 1750RPM384W 1900RPM448W 1950RPM508W 1950RPM521W 220Pa 1500RPM168W 1500RPM194W 1550RPM186W 1550RPM200W 1600RPM223W 1650RPM266W 1650RPM260W 1650RPM334W 1650RPM361W 1700RPM334W 1750RPM371W 1900RPM437W 1900RPM494W 1950RPM518W 210Pa 1400RPM160W 1500RPM177W 1550RPM175W 1550RPM200W 1550RPM225W 1600RPM228W 1650RPM255W 1650RPM322W 1650RPM354W 1700RPM340W 1750RPM405W 1750RPM400W 1900RPM480W 1900RPM520W 200Pa 1400RPM153W 1400RPM123W 1500RPM199W 1550RPM200W 1550RPM180W 1600RPM230W 1600RPM233W 1600RPM235W 1650RPM319W 1650RPM329W 1700RPM355W 1750RPM396W 1900RPM484W 1900RPM515W 190Pa 1400RPM123W 1400RPM135W 1500RPM169W 1550RPM197W 1550RPM177W 1550RPM198W 1600RPM240W 1600RPM240W 1600RPM275W 1650RPM325W 1700RPM352W 1700RPM376W 1900RPM502W 1900RPM505W 180Pa 1250RPM110W 1400RPM153W 1400RPM145W 1500RPM154W 1500RPM178W 1550RPM202W 1550RPM225W 1600RPM273W 1600RPM278W 1650RPM322W 1650RPM348W 1700RPM380W 1750RPM429W 1900RPM495W 170Pa 1250RPM100W 1250RPM94W 1400RPM152W 1500RPM178W 1500RPM183W 1500RPM207W 1550RPM233W 1550RPM239W 1600RPM280W 1600RPM296W 1650RPM344W 1700RPM388W 1750RPM432W 1750RPM451W 160Pa 1100RPM97W 1250RPM90W 1400RPM160W 1500RPM172W 1500RPM187W 1500RPM207W 1550RPM215W 1550RPM243W 1600RPM265W 1600RPM284W 1650RPM326W 1650RPM323W 1700RPM390W 1750RPM440W 150Pa 1100RPM95W 1250RPM85W 1300RPM125W 1400RPM160W 1500RPM192W 1500RPM180W 1500RPM211W 1550RPM263W 1550RPM230W 1600RPM279W 1600RPM288W 1650RPM363W 1700RPM410W 1750RPM438W 140Pa 1100RPM88W 1100RPM92W 1300RPM125W 1400RPM170W 1500RPM188W 1500RPM160W 1500RPM218W 1500RPM227W 1550RPM248W 1550RPM240W 1600RPM298W 1650RPM340W 1650RPM379W 1700RPM430W Step P23: According to the fan speed value, the air volume range is divided into multiple wind quantum ranges, and the static pressure range is divided into multiple static pressure sub-ranges, so that a fan speed value can be determined according to a wind quantum range and a static pressure sub-range; different static pressure sub-ranges correspond to different first gear groups; different wind quantum ranges correspond to different first gears; for a first gear group, different first gears correspond to different fan speed values; for example, Table 2.

[0026] Table 2 First gear 0 1 2 3 4 5 6 7 First gear group 0CMH 300-500CMH 501-1000CMH 1001-1200CMH 1201-1400CMH 1401-1600CMH 1601-1700CMH 1701-1900CMH A 231-240Pa 0RPM 1550RPM 1660RPM 1650RPM 1700RPM 1750RPM 1950RPM 1950RPM B 221-230Pa 0RPM 1500RPM 1550RPM 1600RPM 1650RPM 1700RPM 1750RPM 1900RPM C 191-220Pa 0RPM 1400RPM 1500RPM 1550RPM 1600RPM 1650RPM 1750RPM 1750RPM D 171-190Pa 0RPM 1250RPM 1400RPM 1500RPM 1600RPM 1650RPM 1700RPM 1750RPM E 140-170Pa 0RPM 1100RPM 1250RPM 1400RPM 1500RPM 1550RPM 1600RPM 1700RPM Step P23 includes: The air volume values ​​corresponding to the same or similar fan speed values ​​are divided into the same wind sub-range; the air static pressure values ​​corresponding to the same or similar fan speed values ​​are divided into the same static pressure sub-range; two fan speed values ​​are similar when the difference between the two fan speed values ​​is less than 5% of the smaller fan speed value.

[0027] After simplifying the control logic through step P23, the full air system can operate in one of the five first gear groups of AE, and a first gear group contains eight first gears from 0 to 7. After designing the layout of the full air system according to the requirements, the total pipeline resistance value of the full air system can be estimated, and the corresponding first gear group can be selected from AE as the first gear group for the air supply fan to operate according to the total pipeline resistance value (for example: the total pipeline resistance value is 180Pa, and the air supply fan operates in the first gear group D). After determining the first gear group, the full air system can be put into use, and the controller can select the first gear for the air supply fan to operate from the first gear group according to the total required air volume.

[0028] Before step S3, the air volume control method includes: Step P3: Calculate the total required air volume of the full air system, which is calculated by adding up the required air volumes of different indoor spaces served by the full air system; The required air volume of an indoor space is the product of the air volume coefficient and the default air volume. The default air volume is positively correlated with the size of the indoor space. The air volume coefficient is related to the air conditioning mode. For example, the air volume coefficient of the rapid cooling mode is 3.0, and the air volume coefficient of the rapid purification mode is 1.2.

[0029] Before step S4, the air volume control method includes: Step P4: Determine the air volume coefficient of the indoor space according to the air conditioning mode of the indoor space; the corresponding relationship between the air conditioning mode and the air volume coefficient is predetermined.

Claims

1. A method for controlling air volume in a full air system, the full air system comprising a controller, a supply air fan, a fresh air fan, an exhaust air fan and at least two air valves, the number of air valves corresponding to the number of indoor spaces served by the full air system; the air valves, the fresh air fan, the exhaust air fan and the supply air fan are respectively connected to the controller, characterized in that: The controller controls the air supply volume of the indoor space by adjusting the first gear position of the air supply fan and the second gear position of the air valve; the air volume control method includes: Step S1: Calculate the total resistance value of the pipelines of the full air system according to the resistance value of the pipeline units contained in the full air system; the resistance value of the pipeline units is determined in advance through testing; Step S2: determining the first gear group for the operation of the air supply fan according to the static pressure sub-range to which the total resistance value of the pipeline of the whole air system belongs; the first gear group corresponds to the static pressure sub-range one by one; the corresponding relationship between the first gear group and the static pressure sub-range is determined in advance through testing; Step S3: determining the first gear of the air supply fan in the first gear group according to the wind quantum range to which the total required air volume of the full air system belongs, so that the air supply fan operates at the fan speed value corresponding to the first gear; in a first gear group, the first gear corresponds to the wind quantum range one by one; the corresponding relationship between the first gear and the wind quantum range, and the corresponding relationship between the first gear and the fan speed value are determined in advance through testing; Step S4: determining the second gear position of the corresponding air valve according to the air volume coefficient of the indoor space; the corresponding relationship between the air volume coefficient and the second gear position is predetermined.

2. The air volume control method according to claim 1, characterized in that: Before step S1, the air volume control method includes: Step P1: Determine the resistance values ​​of different pipe units through testing. The pipe units are divided into straight pipe units, 90° horizontal bend units, 90° vertical bend units, 45° horizontal bend units, 45° vertical bend units, Y-type three-way units, and T-type three-way units.

3. The air volume control method according to claim 1, characterized in that: Before step S1, the air volume control method includes: Step P2: Determine through testing the corresponding relationship between the first gear group and the static pressure sub-range, the corresponding relationship between the first gear and the wind sub-range, and the corresponding relationship between the first gear and the fan speed value; Step P2 includes: Step P21: determining a set of air volume values ​​and a set of air outlet static pressure values ​​according to the air volume range and static pressure range of the full air system, wherein the set of air volume values ​​includes a plurality of unequal air volume values, and the set of air outlet static pressure values ​​includes a plurality of unequal air outlet static pressure values; Step P22: for each outlet static pressure value, at the corresponding outlet static pressure, adjust the air volume of the air supply fan to each outlet volume value in turn, and record the fan speed values ​​corresponding to different outlet volume values; Step P23: According to the fan speed value, the air volume range is divided into multiple wind quantum ranges, and the static pressure range is divided into multiple static pressure sub-ranges, so that a fan speed value can be determined based on a wind quantum range and a static pressure sub-range; different static pressure sub-ranges correspond to different first gear groups; different wind quantum ranges correspond to different first gears; for a first gear group, different first gears correspond to different fan speed values.

4. The air volume control method according to claim 3, characterized in that: Step P23 includes: The air volume values ​​corresponding to the same or similar fan speed values ​​are divided into the same wind sub-range; the air static pressure values ​​corresponding to the same or similar fan speed values ​​are divided into the same static pressure sub-range; two fan speed values ​​are similar when the difference between the two fan speed values ​​is less than 5% of the smaller fan speed value.

5. The air volume control method according to claim 1, characterized in that: Before step S3, the air volume control method includes: Step P3: Calculate the total required air volume of the full air system. The total required air volume is calculated by adding up the required air volumes of different indoor spaces served by the full air system.

6. The air volume control method according to claim 1, characterized in that: Before step S4, the air volume control method includes: Step P4: Determine the air volume coefficient of the indoor space according to the air conditioning mode of the indoor space; the corresponding relationship between the air conditioning mode and the air volume coefficient is predetermined.

7. The air volume control method according to any one of claims 1 to 6, characterized in that: The air supply fan of this full air system is an EC fan.

8. An all-air system, comprising a controller, a supply air fan, a fresh air fan, an exhaust air fan and at least two air valves, wherein the number of air valves corresponds to the number of indoor spaces served by the all-air system; the air valves, the fresh air fan, the exhaust air fan and the supply air fan are respectively connected to the controller; characterized in that: The air volume supplied to the indoor space served by the all-air system is controlled by the air volume control method as described in any one of claims 1 to 7.

9. The all-air system according to claim 8, characterized in that: This all-air system does not include an air volume sensor.

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