System control method, device, air source heat pump system, storage medium and electronic equipment based on air volume attenuation

Abstract

The present invention discloses a system control method, device, air source heat pump system, storage medium and electronic device based on air volume attenuation. Among them, the method includes: after the system starts heating operation, whether each unit of the system needs to be defrosted is detected; if so, the real-time air volume of each unit to be defrosted is detected, and the units to be defrosted are controlled to defrost in the order of air volume from small to large; if not, whether the terminal load of the system changes is determined; according to the change trend of the terminal load and the size order of the real-time air volume of the unit, the unit loading operation, load reduction operation or frequency increase and decrease operation is performed. When the unit needs to be defrosted, the present invention determines the defrosting order of the unit according to the actual air volume attenuation of the unit; when the unit does not need to be defrosted, the system loading and unloading, frequency increase and decrease judgment basis is given according to the actual air volume attenuation of the unit. By optimizing the operation strategy, the cold island effect caused by the centralized placement of the unit is improved, and the operation energy efficiency of the air source heat pump system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pump systems, and in particular to a system control method and device based on wind volume attenuation, an air source heat pump system, a storage medium and an electronic device. Background Art

[0002] As an efficient, energy-saving and environmentally friendly energy conversion device, air source heat pumps are increasingly widely used. However, when air source heat pumps are arranged in conventional clusters, due to the repeated circulation of air and the centralized operation of the units, the temperature around the units in the middle will become lower and lower during heating operation, forming a cold island effect, causing the units to enter low-temperature conditions prematurely and reducing heating performance. In addition, the existence of the cold island effect greatly reduces the operating efficiency of the air source heat pump system when it is running in heating mode, and increases the operating energy consumption of the air source heat pump system. Therefore, the cold island effect of air source heat pumps is an issue that needs to be paid attention to and resolved.

[0003] With regard to the problem in the prior art that the air source heat pump system has poor operating efficiency due to the cold island effect, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a system control method, device, air source heat pump system, storage medium and electronic device based on air volume attenuation to solve the problem in the prior art that the air source heat pump system has poor operating efficiency due to the cold island effect.

[0005] To solve the above technical problems, the present invention provides a system control method based on air volume attenuation, wherein the method comprises: after the system starts heating operation, detecting whether each unit of the system needs to be defrosted; if so, detecting the real-time air volume of each unit to be defrosted, and controlling the units to be defrosted to defrost in the order of air volume from small to large; if not, judging whether the terminal load of the system changes; if changed, executing loading operation or load reduction operation of the unit according to the changing trend of the terminal load and the size sequence of the real-time air volume of the unit, and if there is no change, executing the frequency increase or decrease operation of the unit according to the size sequence of the real-time air volume of the unit.

[0006] Furthermore, whether each unit of the system needs to be defrosted is detected, including:

[0007] Detect the fin side ambient temperature Tch and fin side ambient humidity Rch of each unit;

[0008] If the Tch≤preset defrost temperature difference+k, and Tch-preset defrost temperature difference≤ambient dew point temperature, and Rch≥preset humidity value, it is determined that the unit needs defrosting; wherein k is a preset value.

[0009] Furthermore, after controlling the defrosting units to be defrosted in the order of air volume from small to large, the method further includes: determining the defrosting type to be performed according to the fin side ambient temperature Tch of each defrosting unit; wherein the defrosting types include: natural defrosting and forced defrosting.

[0010] Furthermore, the defrosting type to be performed by each defrosting unit is determined according to the ambient temperature Tch on the fin side of the defrosting unit, including:

[0011] If the Tch of the defrost unit is greater than the preset temperature threshold, the defrost unit performs natural defrosting; wherein, during the natural defrosting, the defrost unit is not turned on, but the fan is turned on;

[0012] If the Tch of the defrost unit is less than or equal to the preset temperature threshold, the defrost unit performs forced defrosting; wherein, during the forced defrosting, the defrost unit is turned on, but the fan is not turned on.

[0013] Furthermore, after the defrosting unit performs natural defrosting, the method further comprises:

[0014] Detect the unit's outlet air temperature, return air temperature and real-time outlet air volume;

[0015] If the following conditions are met: the unit's outlet air temperature - return air temperature ≤ the preset temperature difference, and the real-time outlet air volume ≥ the rated outlet air volume, then exit the natural defrost.

[0016] Further, it is determined whether the terminal load of the system changes; if it changes, the loading operation or the load reduction operation of the unit is performed according to the change trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, the frequency increase or decrease operation of the unit is performed according to the size sequence of the real-time air volume of the unit; including:

[0017] If the change trend of the terminal load is increasing, the loading operation of the unit is performed in order from large to small in real-time air volume;

[0018] If the terminal load is decreasing, the load reduction operation of the unit is performed in order from small to large in real-time air volume;

[0019] If the changing trend of the terminal load is unchanged, according to the order of real-time air volume from small to large Q1...Qm...Qn, the Q1...Qm sequential units are controlled to perform frequency reduction operation, and the Qn...Qm sequential units are controlled to perform frequency increase operation; wherein n is the total number of units in the system, m<n.

[0020] Further, the loading operation of the units is performed in order of the real-time air volume from large to small, including: increasing the load rate of each unit to a preset maximum load rate in order of the real-time air volume from large to small, until the load rate of all units is increased to the preset maximum load rate, and then a new unit that has not been started is added to start operation;

[0021] The load reduction operation of the units is performed in sequence according to the real-time air volume from small to large, including: reducing the load rate of each unit in sequence according to the real-time air volume from small to large to a preset minimum load rate, until the load rate of all units is reduced to the preset minimum load rate, and then shutting down the unit with the smallest real-time air volume.

[0022] The present invention also provides a system control device based on wind volume attenuation, wherein the device comprises:

[0023] The defrost judgment module is used to detect whether each unit in the system needs defrosting after the system starts heating operation;

[0024] The first processing module is used for detecting the real-time air volume of each unit to be defrosted when the judgment result of the defrosting judgment module is yes, and controlling the units to be defrosted to defrost in the order of air volume from small to large;

[0025] The second processing module is used to determine whether the terminal load of the system changes when the judgment result of the defrost judgment module is no; if it changes, the unit is loaded or unloaded according to the change trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, the unit is increased or decreased in frequency according to the size sequence of the real-time air volume of the unit.

[0026] The present invention also provides an air source heat pump system, wherein the air source heat pump system includes the above-mentioned system control device based on air volume attenuation.

[0027] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program implements the above method when executed by a processor.

[0028] The present invention also provides an electronic device, which includes: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0029] By applying the technical solution of the present invention, when the unit needs to be defrosted, the defrosting order of the unit is determined according to the actual situation of the unit's air volume attenuation. When the unit does not need to be defrosted, the basis for judging the system load reduction and frequency increase and decrease is given according to the actual situation of the unit's air volume attenuation. By optimizing the operation strategy, the cold island effect caused by the centralized placement of the units is improved, and the operating energy efficiency of the air source heat pump system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of a system control method based on wind volume attenuation according to an embodiment of the present invention;

[0031] Figure 2 is a detailed flow chart of a system control method based on wind volume attenuation according to an embodiment of the present invention;

[0032] Figure 3 4 is a structural block diagram of a system control device based on wind volume attenuation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0035] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0037] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0038] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example 1

[0039] When the air source heat pump system is applied to regional heating projects, multiple modules are usually required to operate jointly. The evaporator modules of the heat pump units are often arranged outdoors in the form of an array. During winter heating operation, the low-temperature air discharged by the air source heat pump units after heat exchange flows back into the center area of ​​the array. The air field temperature in the center area of ​​the array is much lower than the ambient atmospheric temperature, forming a cold island effect in the unit array.

[0040] The existence of the cold island effect greatly reduces the operating efficiency of the heat pump unit in winter heating operation, increases the operating energy consumption of the air source heat pump system, and causes problems such as high operating costs and insufficient output of the heat pump unit.

[0041] In the early stage, the methods to improve the cold and hot island effect mainly focused on the impact of external factors and ignored the changes in the unit itself. When the cold island effect is affected by external conditions, the most intuitive data should be the changes in the parameters of the unit itself. The embodiment of the present invention adopts a control scheme to detect the parameters of the unit itself to improve the cold island effect caused by the centralized placement of the unit, improve the operating energy efficiency of the air source heat pump system, and reduce the system operating costs.

[0042] According to an embodiment of the present invention, an embodiment of a system control method based on wind volume attenuation is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0043] Figure 1 is a flow chart of a system control method based on wind volume attenuation according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0044] Step S101, after the system starts heating operation, it detects whether each unit of the system needs to be defrosted.

[0045] Before starting the heating operation, the indoor temperature can be detected in real time. When the indoor temperature is less than the indoor target temperature - △T0 (△T0 can be 1°C, adjustable within the range of 0~5°C), the conditions for starting the heating operation are met, and the system is triggered to start the heating operation.

[0046] Step S102: if yes, detect the real-time air volume of each unit to be defrosted, and control the units to be defrosted to defrost in the order of air volume from small to large.

[0047] Step S103, if not, determine whether the terminal load of the system has changed; if changed, perform loading or unloading operations on the unit according to the changing trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, perform frequency increase or decrease operations on the unit according to the size sequence of the real-time air volume of the unit.

[0048] In this embodiment, when the unit needs to be defrosted, the defrosting order of the unit is determined according to the actual situation of the unit's air volume attenuation. When the unit does not need to be defrosted, the basis for judging the system load reduction and frequency increase and decrease is given according to the actual situation of the unit's air volume attenuation. By optimizing the operation strategy, the cold island effect caused by the centralized placement of the units is improved, and the operating energy efficiency of the air source heat pump system is improved.

[0049] When the system is in heating operation, the unit needs to take heat from the air. If the temperature of the air sucked in by the air conditioner return air is very low, lower than the preset defrost temperature difference + k (the preset defrost temperature difference can be 4°C, k can be 1, used to ensure the value of the margin), then the temperature of the air sucked in from the return air after heat exchange in the unit heat exchanger is lower than the outdoor environment dew point temperature, and if the outdoor humidity is high at this time, the unit will frost, which will affect the unit's heating capacity and cause the heating capacity to decay. Therefore, it is necessary to find the unit that needs to be defrosted and put it into normal use after defrosting as soon as possible.

[0050] Based on this, this embodiment provides a preferred implementation method, which detects whether each unit of the system needs defrosting, including: detecting the fin side ambient temperature Tch and the fin side ambient humidity Rch of each unit; if Tch ≤ preset defrosting temperature difference + k, and Tch-preset defrosting temperature difference ≤ ambient dew point temperature, and Rch ≥ preset humidity value, then it is determined that the unit needs defrosting; where k is a preset value. In this way, the unit to be defrosted can be determined in time, ensuring that the unit that needs defrosting can be defrosted as soon as possible.

[0051] Due to the cold island effect, differences in return air space, frosting of the unit, etc., the unit will experience different degrees of air volume attenuation. In the case of heating, the concentrated placement of the units produces a cold island effect. The greater the air volume attenuation, the more serious the attenuation of the unit's heating capacity, the greater the impact of the cold island effect, frosting, etc. on its capacity, and the lower the unit's energy efficiency. Therefore, it is necessary to give priority to defrosting the unit with the most serious air volume attenuation (that is, the unit with the worst energy efficiency) so that the unit's capacity can be restored to its original capacity as soon as possible to improve the system's energy efficiency. Therefore, after determining the unit to be defrosted, this embodiment detects the real-time air volume of each unit to be defrosted, and controls the units to be defrosted to be defrosted in the order of air volume from small to large. Based on this, it can ensure that the unit with the most serious frosting, the worst heating capacity, and the lowest energy efficiency will be defrosted first, thereby improving the system's energy efficiency as quickly and as much as possible.

[0052] When controlling the units to be defrosted to defrost in the order of small to large air volume, the preset ratio value of the number of units in each round of defrosting to the total number of units can be set, for example, set to 1 / 3. The number of units in each round of defrosting accounts for 1 / 3 of the total number of units, and defrosting is arranged in the order of small to large air volume. Defrosting requires heat from the system. During defrosting, the number of units defrosted each time cannot exceed the preset ratio value (for example, 1 / 3) of the number of units in the system. That is, when there are units in the system that are defrosting, the maximum number of units that are defrosting is 1 / 3 of the total number of units in the system. The setting of 1 / 3 here is to ensure that the defrosting units can be defrosted as soon as possible and put into normal use of the system. After detecting the units to be defrosted, if the number of units to be defrosted is less than or equal to the preset ratio value of 1 / 3 of the number of units in the system, then these units to be defrosted are directly controlled to perform defrosting. For example, if a system has 9 units and 2 units are detected to need defrosting, because 2<9*1 / 3, then the above 2 units will be controlled to perform defrosting in the first round. If the frost detected on the units to be defrosted is greater than the preset ratio value 1 / 3 of the number of units, in order to defrost and put the system into use as soon as possible, then 1 / 3 of the total number of system units will be controlled to perform defrosting in each round. For example, if a system has 9 units and 5 units are detected to need defrosting, because 5>9*1 / 3, then the 3 units with smaller air volume among the 5 units will be controlled to perform defrosting in the first round, and the remaining 2 units will be controlled to perform defrosting in the second round. Therefore, the number of units controlled for defrosting in each round can be adjusted to be greater than 0 and less than or equal to the preset ratio value * the total number of system units, so as to maximize the system operation efficiency.

[0053] After controlling the defrosting units to be defrosted in the order of small to large air volume, the method further includes: determining the defrosting type to be executed according to the fin side ambient temperature Tch of each defrosting unit; wherein the defrosting types include: natural defrosting and forced defrosting. It should be noted that the cold island effect will cause the air field temperature in the central area of ​​the array to be much lower than the ambient atmospheric temperature. Therefore, it is more accurate to detect the fin side ambient temperature Tch of the defrosting unit (that is, the temperature near the return air, that is, the air temperature inhaled by the unit) than to detect the ambient temperature to determine whether it can be defrosted naturally. For example, when the ambient temperature is about 2°C, the temperature near the return air in the middle area where the units are concentrated is about -2°C. If the ambient temperature is detected to consider whether it can be defrosted naturally, that is, the natural defrosting method can be used when the ambient temperature is greater than or equal to 2°C, but in fact, because of the cold island effect at this time, the air inhaled by the middle unit is actually -2°C, and the natural defrosting method cannot achieve the defrosting effect at this time, so it is more accurate to detect the fin side ambient temperature Tch of the defrosting unit. This avoids the influence of inaccurate natural defrosting judgment caused by the cold island effect. Based on this, this embodiment fully considers the impact of the cold island effect on the system, and adjusts the judgment condition of natural defrosting to the fin side ambient temperature Tch, which makes the judgment more accurate and can make full use of the natural defrosting technology to improve the system energy efficiency.

[0054] Natural defrosting uses the heat of air for defrosting. The unit itself is turned off, and the fan is turned on to enhance the defrosting effect. Using the heat of the outdoor air for defrosting is a relatively energy-saving defrosting type, that is, during natural defrosting, only the fan of the unit is running.

[0055] Forced defrosting is equivalent to turning on the refrigeration of the unit. It absorbs heat from the system to defrost, which consumes more electricity. To ensure that the heat loss is small, the fan is not turned on.

[0056] This embodiment provides a preferred implementation method, which determines the defrost type to be performed by each defrost unit according to the ambient temperature Tch on the fin side, including: if the Tch of the defrost unit is greater than the preset temperature threshold, the defrost unit performs natural defrosting; wherein, during natural defrosting, the defrost unit is not turned on, and the fan is turned on; if the Tch of the defrost unit is less than the preset temperature threshold, the defrost unit performs forced defrosting; wherein, during forced defrosting, the defrost unit is turned on, and the fan is not turned on. The reason for optimizing the above-mentioned natural defrosting judgment conditions is, firstly, to improve the judgment accuracy, and secondly, to consider the purpose of energy saving and improving system energy efficiency, so that natural defrosting takes precedence over forced defrosting. If natural defrosting is possible, natural defrosting is performed, and if natural defrosting is not possible, forced defrosting is performed. This improves system energy efficiency and saves system operating costs.

[0057] When the defrost unit performs forced defrosting, the defrosting time can be set, for example, 5 minutes. When forced defrosting reaches 5 minutes, the forced defrosting ends and the process returns to step S101. For natural defrosting, the present embodiment sets corresponding exit conditions. Specifically, after the defrost unit performs natural defrosting, the unit outlet air temperature, return air temperature and real-time outlet air volume are detected. If the following conditions are met: unit outlet air temperature - return air temperature ≤ preset temperature difference, and real-time outlet air volume ≥ rated outlet air volume, then exit natural defrosting.

[0058] In this embodiment, the difference between the inlet and outlet air temperatures of the unit when natural defrosting is completed is set to a preset temperature difference ΔT, considering that: during natural defrosting, only the fan works. Due to the frost on the fin surface, there will be a temperature difference when the air is sucked in and passes through the frost layer. When the natural defrosting is completed and the frost is basically melted, the temperature between the inlet air and the air blown out by the fan should be close to 0°C, but the actual situation will not be 0°C, so this ΔT value can be, for example, 0.5 degrees or 1 degree, which can be adjusted according to the actual situation. When there is a frost layer, the air volume is affected by the frost layer, and the air volume blown out by the fan will be less than the air volume sucked in. When defrosting is completed, there is no frost layer, so the air volume should not be affected, and the real-time air volume should be greater than or equal to the rated air volume. When these two conditions are met at the same time, it means that the frost has been melted, and the natural defrosting can be ended. This embodiment simultaneously considers the temperature difference and air volume difference of the wind when affected by the frost layer to make a more accurate judgment on the exit conditions of natural defrosting. This embodiment provides relatively accurate natural defrosting judgment conditions based on the detection of the unit's own parameters, can achieve full defrosting during natural defrosting, and can timely judge the end of defrosting, so that the unit can return to normal operation, ensuring the operating efficiency of the system.

[0059] When it is determined that the unit does not need to defrost, the preferred implementation method for improving the cold island effect provided in this embodiment is: judging whether the terminal load of the system changes; and performing loading operation, load reduction operation or frequency increase / decrease operation of the unit according to the changing trend of the terminal load and the size sequence of the real-time air volume of the unit.

[0060] (1) If the terminal load trend is increasing, the unit loading operation is performed in the order of the real-time air volume from large to small;

[0061] Specifically, the load factor of each unit is increased to a preset maximum load factor in order of the real-time air volume from large to small, until the load factors of all units are increased to the preset maximum load factors, and then a new unit that has not been started is added and started to operate.

[0062] It should be noted that when the terminal load increases, that is, when the heating demand increases, the unit needs to be loaded, then it is loaded in the order of large to small air volume in the turned-on unit until the unit needs to be started up. The reason for setting the loading in the order of large to small air volume is that: First, in the variable frequency unit, the lower the unit load rate, the higher the unit energy efficiency. In other words, if the unit energy efficiency is low and it is still required to load, the unit load rate will be increased. At this time, the unit energy efficiency will be lower, and the cold island effect will be more serious, affecting the operating energy efficiency of the entire system; second, in the case of heating, the centralized placement produces a cold island effect. The greater the air volume attenuation, the more serious the attenuation of the unit's heating capacity, the greater the impact of the cold island effect on its capacity, and the lower the unit energy efficiency. Based on the above two situations, that is, the greater the air volume, the higher the energy efficiency of the unit; the lower the load rate, the higher the energy efficiency of the unit. When the terminal load demand increases (heating demand increases), this embodiment considers giving priority to the units with small air volume attenuation, that is, the units with large air volume, small cold island effect and high energy efficiency are loaded first, thereby ensuring that the system energy efficiency is higher than other loading conditions.

[0063] In this embodiment, the air source cooling and heating station units are ranked for frequency increase according to the air volume attenuation. The units with small air volume attenuation (that is, large air volume) are given priority for frequency increase to improve the cold island effect, thereby maximally improving the cold island effect caused by centralized placement and ensuring system energy efficiency.

[0064] (2) If the terminal load trend is decreasing, the load reduction operation of the unit is performed in the order of the real-time air volume from small to large;

[0065] Specifically, the load factor of each unit is reduced to a preset minimum load factor in order from small to large in real-time air volume, until the load factors of all units are reduced to the preset minimum load factors, and then the unit with the smallest real-time air volume is shut down.

[0066] The reason why the load reduction is set in the order of small to large air volume is that: first, in the variable frequency unit, the lower the unit load rate, the higher the unit energy efficiency. That is to say, if the unit energy efficiency is low, I let it reduce the load and reduce the load rate of the unit. At this time, the unit energy efficiency will be improved, the cold island effect will be improved, and the operating energy efficiency of the entire system will be improved; second, under the heating condition, the centralized placement produces the cold island effect. The greater the air volume attenuation, the smaller the air volume, the more serious the attenuation of the unit's heating capacity, the greater the impact of the cold island effect on its capacity, and the lower the unit energy efficiency. Based on the above two situations, that is to say, the smaller the air volume, the lower the unit energy efficiency, the lower the load rate, and the higher the unit energy efficiency; when the terminal load demand decreases (heating demand decreases), this embodiment gives priority to reducing the air volume attenuation, that is, the units with small air volume, large cold island effect, and low energy efficiency are given priority to reduce the load, thereby improving the energy efficiency of these units, improving the cold island effect, and improving the system energy efficiency.

[0067] In this embodiment, when the terminal load decreases, the air source cooling and heating station units are ranked for frequency reduction according to the air volume attenuation. The units with large air volume attenuation (that is, small air volume) are given priority for frequency reduction, thereby improving the cold island effect and enhancing the system operation energy efficiency.

[0068] (3) If the changing trend of the terminal load is unchanged, according to the order of real-time air volume from small to large Q1...Qm...Qn, the Q1...Qm sequential units are controlled to perform frequency reduction operation, and the Qn...Qm sequential units are controlled to perform frequency increase operation; where n is the total number of units in the system, m<n.

[0069] m can be set to m=n / 3, where m is adjustable. Frequency reduction can improve the energy efficiency of the unit. When the load remains unchanged, the units with large air volume attenuation will be given priority to frequency reduction. The load of this frequency reduction will be borne by the units with no air volume attenuation or small air volume attenuation, thereby improving the cold and hot island effect and improving the energy efficiency of the system.

[0070] The reason why the present embodiment sets the frequency reduction of the units in the order of Q1...Qm and the frequency increase of the units in the order of Qm...Qn is that: the order of the air volume from small to large is Q1...Qm...Qn, and m is adjustable. When the terminal load (that is, the terminal heating demand) remains unchanged, the cold island effect will also occur. At this time, the units with serious cold island effect (that is, the units with large air volume attenuation and small air volume) will be given priority to reduce the frequency (the Q1...Qm units will be given priority to reduce the frequency in order), improve the energy efficiency of the units, and improve the air volume attenuation of these units. Because the load demand is unchanged, the load after their frequency reduction will be borne by the units with no air volume attenuation or small air volume attenuation (that is, Qn...Qm) first, thereby improving the cold island effect and improving the energy efficiency of the system. m can be adjusted according to actual conditions.

[0071] For the cold island effect generated when the terminal load demand remains unchanged, this embodiment can adjust the overall load rate of the unit according to the air volume attenuation (partial frequency increase and partial frequency reduction can be adopted) to improve the cold island effect and enhance the system energy efficiency.

[0072] This embodiment adopts a control method for detecting the parameters of the unit itself to improve the cold island effect caused by the centralized placement of the units, and the judgment is accurate. When the terminal load remains unchanged, the air source cooling and heating station units are adjusted according to the air volume attenuation. The units with large air volume attenuation (that is, small air volume and severe cold island effect) are reduced in frequency, and the units with small or no air volume attenuation (that is, large air volume and slight or no cold island effect) are increased in frequency, thereby improving the cold island effect, effectively improving the system operation energy efficiency, reducing energy consumption, and ensuring the stable operation of the heating system. Example 2

[0073] Figure 2is a detailed flow chart of a system control method based on wind volume attenuation according to an embodiment of the present invention, such as Figure 2 As shown, the method comprises the following steps:

[0074] System startup: If the indoor temperature is less than the indoor target temperature - △T0 (△T0 defaults to 1℃, adjustable from 0 to 5℃), the system will start;

[0075] The following parameters are detected during system operation:

[0076] 1. (1) The rated air volume of the unit is Qp;

[0077] (2) An air volume sensor is installed at the air outlet of each unit in the system to detect the real-time air volume Q of the unit, and a temperature sensor is installed to detect the air outlet temperature Tc of the unit;

[0078] (3) A temperature and humidity sensor is installed on the return air side (fin side) of each unit to detect the ambient temperature Tch and the ambient humidity Rch of the fin side of the unit; detect the ambient dew point temperature TL of the unit; detect the return air temperature Th of the unit, Th=Tch;

[0079] (4) Set the difference ΔT between the inlet and outlet air temperatures when natural defrosting is completed;

[0080] 2. Determine whether the unit is defrosting. If Tch≤Tdefrosting temperature difference+1, and Tch-Tdefrosting temperature difference≤TL, and Rch≥80%, the unit needs to be defrosted. Detect the real-time air volume Qreal-time of the defrosting unit, and sort the air volume from small to large Qc1...Qcm...Qcn, and go to the next step; if not, the unit does not defrost, and go to step 6;

[0081] 3. Each time, 1 / 3 of the total number of units are defrosted in order of air volume from small to large, and the fin side ambient temperature Tch of each unit to be defrosted is detected, and then the next step is entered;

[0082] 4. If the ambient temperature Tch on the fin side is greater than 2°C (adjustable), natural defrosting can be performed and the next step can be entered; if not, forced defrosting is performed, each round lasting 5 minutes, and then return to step 1;

[0083] 5. During natural defrosting, if the outlet air temperature Tc-return air temperature Th≤ΔT and the real-time air volume Q≥rated outlet air volume Qp, then end the natural defrosting and return to step 1. If not, return to the natural defrosting state and continue the natural defrosting;

[0084] 6. Check the real-time air volume Q of the unit, sort the air volume Q1...Qm...Qn from small to large, and judge whether the terminal load increases. If so, load in the order of Qn...Q1 (that is, load in the order of air volume from large to small), until the load increases to the point where an additional unit is needed, and return to step 1; if not, proceed to the next step;

[0085] 7. Determine whether the terminal load has been reduced. If so, reduce the load in the order of air volume Q1...Qn (that is, reduce the load in the order of small to large air volume) until the load is reduced to the point where the machine needs to be reduced, and return to step 1; if not, proceed to the next step;

[0086] 8. The terminal load remains unchanged, and the frequency of the units is reduced in the order of air volume Q1...Qm...Qn, and the frequency of the units is increased in the order of Qn...Qm, m=n / 3 (n is the total number of units in the system, m is adjustable, and frequency reduction can improve the energy efficiency of the units. When the load remains unchanged, the units with large air volume attenuation will be given priority to frequency reduction. The load of this frequency reduction will be borne by the units with no air volume attenuation or small air volume attenuation, thereby improving the cold and hot island effect and improving the system energy efficiency). Return to step 1.

[0087] This embodiment is a scheme for operating a clustered air source heat pump system, and is applicable to air source heat pump systems of different numbers and arrangements.

[0088] This embodiment solves the following technical problems:

[0089] Improve the cold island effect: In the early stage, the methods to improve the cold island effect mainly focused on the impact of external factors and ignored the changes in the unit itself. When the cold island effect is affected by external conditions, the most intuitive data should be the changes in the parameters of the unit itself. Now, a system control method that monitors the parameters of the unit itself is used to improve the cold island effect caused by centralized placement, and the judgment is accurate. Specifically, in this embodiment, an air volume sensor can be installed at the air outlet of each unit. The air volume sensor detects the real-time air volume of the unit. According to the air volume attenuation, the air source heat pump system is sorted by frequency increase or decrease, and the units with large air volume attenuation are given priority to frequency reduction or reduction, and the units with small air volume attenuation are given priority to frequency increase, thereby improving the cold island effect.

[0090] Sorting of defrosting units: If the traditional defrosting technology detects that a unit needs to be defrosted, then 1 / 3 (just an example) of the units will be randomly turned on for defrosting, without considering the capacity of the units when frosted, and without considering the energy efficiency of the overall system to give a defrosting order. In this embodiment, a temperature and humidity sensor is installed on the air outlet side of each unit, and a temperature and humidity sensor is installed on the return air side (that is, the fin side) to detect the ambient temperature on the fin side of the unit, the dew point temperature on the air outlet side, and the ambient humidity on the fin side. The defrosting is determined based on the detection data. After the unit is detected to need defrosting, the defrosting units are sorted according to the air volume attenuation. The units that need defrosting and have large air volume attenuation are given priority for defrosting, thereby improving the cold island effect and improving the system energy efficiency.

[0091] Natural defrost judgment condition: The traditional judgment condition for natural defrost is to detect the ambient temperature. If the ambient temperature is greater than or equal to T 干球 When the ambient temperature is greater than or equal to T 干球 , the unit is in the cold island effect, and the temperature around the fin is lower than T 干球 The present embodiment determines whether to defrost according to the detection data, and then sorts the defrosting units, and then determines whether the units can defrost naturally according to the ambient temperature on the fin side, thereby avoiding the influence of inaccurate natural defrosting judgment caused by the cold island effect, and making full use of natural defrosting to reduce system operation energy consumption.

[0092] Natural defrost exit conditions: There is no judgment condition for when natural defrost ends in the current technology. The present embodiment can solve the above problem while comprehensively judging the end of natural defrost based on the temperature difference between the air outlet and return air sides of the unit and the air volume attenuation, thereby providing more accurate natural defrost exit conditions. Example 3

[0093] Corresponds to Figure 1 The system control method based on wind volume attenuation is introduced. This embodiment provides a system control device based on wind volume attenuation, such as Figure 3 The structural block diagram of the system control device based on wind volume attenuation shown in FIG. 1 includes:

[0094] The defrost judgment module 10 is used to detect whether each unit of the system needs defrosting after the system starts heating operation;

[0095] The first processing module 20 is connected to the defrost judgment module 10, and is used to detect the real-time air volume of each unit to be defrosted when the judgment result of the defrost judgment module 10 is yes, and control the units to be defrosted to defrost in the order of air volume from small to large;

[0096] The second processing module 30 is connected to the defrost judgment module 10, and is used to judge whether the terminal load of the system changes when the judgment result of the defrost judgment module 10 is no; if changed, the loading operation or the load reduction operation of the unit is performed according to the changing trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, the frequency increase or decrease operation of the unit is performed according to the size sequence of the real-time air volume of the unit.

[0097] This embodiment can realize the system control scheme based on air volume attenuation introduced in the above embodiment. When the unit needs to be defrosted, the defrosting order of the unit is determined according to the actual air volume attenuation of the unit. When the unit does not need to be defrosted, the basis for judging the load reduction and frequency increase and decrease of the system is given according to the actual air volume attenuation of the unit. By optimizing the operation strategy, the cold island effect caused by the centralized placement of the units is improved, and the operation energy efficiency of the air source heat pump system is improved.

[0098] This embodiment also provides an air source heat pump system, characterized in that the air source heat pump system includes the above-mentioned system control device based on air volume attenuation. The system control scheme based on air volume attenuation introduced in the above embodiment can be applied to cluster air source heat pump systems (also called air source cooling and heating station systems) with different numbers and different arrangements. Example 4

[0099] This embodiment provides an electronic device, which is used in a system control method based on wind volume attenuation. The electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein:

[0100] The memory stores instructions executable by the one processor, the instructions being executed by the at least one processor to enable the at least one processor to:

[0101] After the system starts heating operation, check whether each unit in the system needs to be defrosted; if so, check the real-time air volume of each unit to be defrosted, and control the units to be defrosted to defrost in the order of small to large air volume; if not, determine whether the terminal load of the system changes; according to the changing trend of the terminal load and the size order of the real-time air volume of the units, execute the unit's loading operation, load reduction operation or frequency increase or decrease operation. Example 5

[0102] The embodiment of the present invention provides a software, which is used to execute the technical solutions described in the above embodiment and preferred implementation manner.

[0103] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the system control method based on wind volume attenuation in any of the above method embodiments.

[0104] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: a CD, a floppy disk, a hard disk, an erasable memory, etc.

[0105] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0106] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0107] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0109] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0110] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0111] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system control method based on wind volume attenuation, characterized in that: The method comprises: After the system starts heating operation, check whether each unit in the system needs defrosting; If yes, detect the real-time air volume of each unit to be defrosted, and control the units to be defrosted to defrost in the order of small to large air volume; If not, determine whether the terminal load of the system has changed; if changed, perform loading or unloading operations on the unit according to the changing trend of the terminal load and the size sequence of the unit's real-time air volume; if there is no change, perform frequency increase or decrease operations on the unit according to the size sequence of the unit's real-time air volume.

2. The method according to claim 1, characterized in that Check whether each unit in the system needs defrosting, including: Detect the fin side ambient temperature Tch and fin side ambient humidity Rch of each unit; If the Tch is less than or equal to the preset defrost temperature difference + k, and Tch - the preset defrost temperature difference is less than or equal to the ambient dew point temperature, and Rch is greater than or equal to the preset humidity value, it is determined that the unit needs to be defrosted; Here, k is a preset value.

3. The method according to claim 1, characterized in that After controlling the units to be defrosted to defrost in the order of air volume from small to large, the method further comprises: The defrosting type to be performed by each defrosting unit is determined according to the ambient temperature Tch on the fin side of the defrosting unit; wherein the defrosting types include: natural defrosting and forced defrosting.

4. The method according to claim 3, characterized in that The defrost type to be performed is determined according to the ambient temperature Tch on the fin side of each defrost unit, including: If the Tch of the defrost unit is greater than the preset temperature threshold, the defrost unit performs natural defrosting; wherein, during the natural defrosting, the defrost unit is not turned on, but the fan is turned on; If the Tch of the defrost unit is less than or equal to the preset temperature threshold, the defrost unit performs forced defrosting; wherein, during the forced defrosting, the defrost unit is turned on, but the fan is not turned on.

5. The method according to claim 4, characterized in that After the defrosting unit performs natural defrosting, the method further comprises: Detect the unit's outlet air temperature, return air temperature and real-time outlet air volume; If the following conditions are met: the unit's outlet air temperature - return air temperature ≤ the preset temperature difference, and the real-time outlet air volume ≥ the rated outlet air volume, then exit the natural defrost.

6. The method according to claim 1, characterized in that Determine whether the terminal load of the system changes; if it changes, perform a loading operation or a load reduction operation of the unit according to the change trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, perform a frequency increase or decrease operation of the unit according to the size sequence of the real-time air volume of the unit; including: If the change trend of the terminal load is increasing, the loading operation of the unit is performed in order from large to small in real-time air volume; If the terminal load is decreasing, the load reduction operation of the unit is performed in order from small to large in real-time air volume; If the changing trend of the terminal load is unchanged, according to the order of real-time air volume from small to large Q1...Qm...Qn, the Q1...Qm sequential units are controlled to perform frequency reduction operation, and the Qn...Qm sequential units are controlled to perform frequency increase operation; wherein n is the total number of units in the system, m<n.

7. The method according to claim 6, characterized in that The unit loading operation is performed in order from large to small according to the real-time air volume, including: The load factor of each unit is increased to the preset maximum load factor in the order of the real-time air volume from large to small, until the load factors of all units are increased to the preset maximum load factors, then a new unit that has not been started is added and started to operate; The load shedding operation of the unit is performed in order from small to large in real-time air volume, including: The load factor of each unit is reduced to the preset minimum load factor in the order of the real-time air volume from small to large, until the load factors of all units are reduced to the preset minimum load factors, and then the unit with the smallest real-time air volume is shut down.

8. A system control device based on wind volume attenuation, characterized in that: The device comprises: The defrost judgment module is used to detect whether each unit in the system needs defrosting after the system starts heating operation; The first processing module is used for detecting the real-time air volume of each unit to be defrosted when the judgment result of the defrosting judgment module is yes, and controlling the units to be defrosted to defrost in the order of air volume from small to large; The second processing module is used to determine whether the terminal load of the system changes when the judgment result of the defrost judgment module is no; if it changes, the unit is loaded or unloaded according to the change trend of the terminal load and the size sequence of the real-time air volume of the unit; if there is no change, the unit is increased or decreased in frequency according to the size sequence of the real-time air volume of the unit.

9. An air source heat pump system, characterized in that: The air source heat pump system includes the system control device based on wind volume attenuation as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

11. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the method according to any one of claims 1 to 7.

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