Method and device for controlling fan in fan coil system

Abstract

The invention relates to a control method and device for a fan in a fan coil system, and the method comprises the steps: determining the number of rooms needing air supply, and determining the air supply amount required by the rooms needing air supply; based on a first ratio of the number of the rooms needing air supply to the number of all the rooms and a second ratio of the currently needed air supply amount to the air supply amount generated by full-load operation of the fan coil system, the number of started fans in the fan coil system is determined; the fans with the number corresponding to the number of the started fans are started, and the rotating speed of the started fans is adjusted so that the air supply amount can reach the needed air supply amount; and according to the fan efficiency and / or the fan rotating speed of the started fans, whether the starting number and the fan rotating speed are adjusted or not is determined, and the air supply amount generated by all the started fans after adjustment meets the needed air supply amount. By means of the fan coil, the problem that in the prior art, fans in the fan coil can only be started and stopped at the same time, and consequently energy consumption is high is solved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly to a control method and device for a fan in a fan coil system. Background Art

[0002] Currently, the operable static pressure range of a fan coil is approximately ±50 Pa of the rated static pressure, and at most 4 fans are used, that is, at most 2 motors are used, that is, 1 motor drives 1 to 2 fans, and the fans start and stop simultaneously, resulting in high energy consumption.

[0003] In view of the above problems in the prior art, there is currently no effective solution. Summary of the Invention

[0004] The present application provides a control method and device for a fan in a fan coil system to solve the problem of high energy consumption caused by the fact that the fans in the fan coil can only start and stop simultaneously in the prior art.

[0005] In a first aspect, the present application provides a control method for a fan in a fan coil system, including: determining the number of rooms that need to be supplied with air, and determining the required air supply volume for the rooms to be supplied with air; determining the number of fans to be started in the fan coil system based on a first ratio of the number of rooms that need to be supplied with air to the total number of rooms and a second ratio of the currently required air supply volume to the air supply volume generated when the fan coil system operates at full load; starting the fans corresponding to the number of fans to be started, and adjusting the rotational speed of the started fans so that the air supply volume reaches the required air supply volume; determining whether to adjust the number of fans to be started and the rotational speed of the fans based on the fan efficiency and / or rotational speed of the started fans, wherein the air supply volume generated by all the started fans after adjustment meets the required air supply volume.

[0006] In a second aspect, the present application provides a control device for a fan in a fan coil system, including: a first determination module for determining the number of rooms that need to be supplied with air, and determining the required air supply volume for the rooms to be supplied with air; a second determination module for determining the number of fans to be started in the fan coil system based on a first ratio of the number of rooms that need to be supplied with air to the total number of rooms and a second ratio of the currently required air supply volume to the air supply volume generated when the fan coil system operates at full load; a first processing module for starting the fans corresponding to the number of fans to be started, and adjusting the rotational speed of the started fans so that the air supply volume reaches the required air supply volume; a second processing module for determining whether to adjust the number of fans to be started and the rotational speed of the fans based on the fan efficiency and / or rotational speed of the started fans, wherein the air supply volume generated by all the started fans after adjustment meets the required air supply volume.

[0007] In a third aspect, the present application provides an air conditioning device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to execute the control method of the fan in the fan coil system described in the first aspect of the present application above.

[0008] In a fourth aspect, the present application further provides a computer storage medium storing computer-executable instructions for executing the control method of the fan in the fan coil system described in the first aspect of the present application above.

[0009] Compared with the prior art, the above technical solutions provided by the embodiments of the present application have the following advantages: Through the present application, after determining the number of rooms to be supplied with air and the required air supply volume for the rooms to be supplied with air, based on the first ratio of the number of rooms to be supplied with air to the total number of rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the full-load operation of the fan coil system, the number of fans to be started in the fan coil system can be determined, and the fans corresponding to the number of started fans are started, and the rotational speed of the started fans is adjusted so that the air supply volume reaches the required air supply volume. Finally, it is determined whether to adjust the number of started fans and the rotational speed of the fans according to the fan efficiency and / or the rotational speed of the fans, so that while meeting the air volume requirement, the fan efficiency is also in the best state under the current conditions. It can be seen that in the present application, after the fans are started, the number of fans can be adjusted according to the current fan efficiency and rotational speed, and after the number of fans is adjusted, the rotational speed of the fans can be adjusted, so that while meeting the air volume requirement, the fan efficiency is also the most suitable, thereby saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] One or more embodiments are illustrated by way of example in the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0013] Figure 1Flow chart of a control method for a fan in a fan coil system provided by an embodiment of the present application;

[0014] Figure 2 Schematic diagram of fan characteristics provided by an embodiment of the present application;

[0015] Figure 3 Schematic diagram of the structure of an air conditioning air supply system provided by an embodiment of the present application;

[0016] Figure 4 Schematic diagram of the structure of a fan coil system provided by an embodiment of the present application;

[0017] Figure 5 Schematic diagram of the structure of a control device for a fan in a fan coil system provided by an embodiment of the present application;

[0018] Figure 6 Schematic diagram of the structure of an air conditioning device provided by an embodiment of the present application. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0020] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0021] To solve the problem that the fans in the fan coil in the prior art can only be turned on and off simultaneously, resulting in high energy consumption, the present application provides a control method for a fan in a fan coil system, as Figure 1 shown. The steps of this method include:

[0022] Step 101, determining the number of rooms that need to be supplied with air, and determining the air supply volume required for the rooms to be supplied with air;

[0023] In a specific example, a fan coil unit system can supply air to multiple rooms, such as rooms 5, 8, 10, etc. Taking the case where there are 5 rooms to which air is supplied as an example, these 5 rooms do not need to be supplied with air simultaneously. For example, currently only 3 of these rooms need to be supplied with air, or only 1 room needs to be supplied with air at present, etc. Which one or which several rooms need to be supplied with air is determined according to actual requirements. After determining the number of rooms that need to be supplied with air, the required air volume can be determined according to the air volume supplied to each individual room currently. For example, if 3 out of 5 current rooms need to be supplied with air, and the air volume supplied to each room is 2000 m3 / h, then the required air volume is 3 * 2000 = 6000 m3 / h.

[0024] Step 102: Determine the number of fans to be turned on in the fan coil unit system based on the first ratio of the number of rooms that need to be supplied with air to the total number of all rooms and the second ratio of the currently required air volume to the air volume generated when the fan coil unit system operates at full load;

[0025] In this regard, in a specific example, it can be as follows: If the number of rooms with air supply turned on is 50 - 80% (the first ratio) and the required air volume does not exceed 80% of the air volume allowed for the unit to operate at full load (the second ratio), or the number of rooms with air supply turned on does not exceed 80% (the first ratio) and the required air volume is 50 - 80% of the air volume allowed for the unit to operate at full load (the second ratio), then first turn on 2 / 3 of the fans and adjust the rotational speed of each fan to reach the required air volume. If the number of rooms with air supply turned on is 20 - 50% (the first ratio) and the required air volume does not exceed 50% of the air volume allowed for the unit to operate at full load (the second ratio), or the number of rooms with air supply turned on does not exceed 50% (the first ratio) and the required air volume is 20 - 50% of the air volume allowed for the unit to operate at full load (the second ratio), then first turn on 1 / 3 of the fans and adjust the rotational speed of each fan to reach the required air volume. If the number of rooms with air supply turned on is less than 20% (the first ratio) and the required air volume is less than 20% of the air volume allowed for the unit to operate at full load (the second ratio), then first turn on 1 fan and adjust the rotational speed of each fan to reach the required air volume.

[0026] It can be seen that in this application, the number of fans to be turned on currently can be determined in advance according to the number of rooms that need to be supplied with air and the currently required air volume. However, this number of fans to be turned on is not necessarily the final number. It is necessary to determine whether to adjust in combination with fan efficiency and fan rotational speed so that while meeting the air volume requirement, the fan efficiency is also the most appropriate.

[0027] Step 103: Start the fans corresponding to the number of fans turned on, and adjust the rotational speed of the started fans so that the air volume reaches the required air volume;

[0028] Step 104: Determine whether to adjust the number of fans turned on and the fan speed based on the fan efficiency and / or fan speed of the already started fans, where the air supply volume generated by all the turned-on fans after adjustment meets the required air supply volume.

[0029] As can be seen from the above steps 101 to 104, after determining the number of rooms to be supplied with air and the required air supply volume of the rooms to be supplied with air, based on the first ratio of the number of rooms to be supplied with air to the total number of rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system under full load operation, the number of fans turned on in the fan coil system can be determined, and the fans corresponding to the number of fans turned on can be started to adjust the fan speed of the already started fans so that the air supply volume reaches the required air supply volume. Finally, determine whether to adjust the number of fans turned on and the fan speed based on the fan efficiency and / or fan speed of the fans, so that while meeting the air volume, the fan efficiency is also in the best state under the current conditions. For example, if there are a total of 8 current fans, based on the number of rooms to be supplied with air and the required air supply volume, it is determined that 5 fans are needed for air supply. At this time, the fan speed is relatively low, indicating that the fans are not in the best state. One fan can be reduced and the fan speed can be prompted, and then the fan efficiency can be determined. If the fan efficiency is still relatively low at this time, continue to reduce the number of fans turned on, and make a comparison before and after in turn, and select a plan with the highest fan efficiency for air supply. For example, when 3 fans currently provide the required air supply volume, their fan efficiency is higher than that when 2, 4, or 5 fans are turned on. Thus, it can be seen that in this application, after the fans are started, the number of fans can be adjusted according to the current fan efficiency and speed, and after the number of fans is adjusted, the fan speed can be adjusted so that while meeting the air volume, the fan efficiency is also the most appropriate, thereby saving energy consumption.

[0030] In an alternative implementation manner of the embodiment of the present application, for the method of determining the number of fans turned on in the fan coil system based on the first ratio of the number of rooms to be supplied with air to the total number of rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system under full load operation involved in the above step 102, it can further include:

[0031] Step 11: Turn on all the fans in the fan coil system when the first ratio exceeds the first preset threshold and the second ratio exceeds the first preset threshold;

[0032] Step 12: Determine that the number of fans turned on is the first number when the first ratio is within the first preset range and the second ratio is lower than the second preset threshold, or when the first ratio is lower than the second preset threshold and the second ratio is within the first preset range; where the second preset threshold is the maximum value within the first preset range.

[0033] Step 13, when the first ratio is within the second preset range and the second ratio is lower than the third preset threshold, or when the first ratio is lower than the third preset threshold and the second ratio is within the second preset range, determine that the number of units to be turned on is the second quantity; where the third preset threshold is the maximum value within the second preset range;

[0034] Step 14, when the first ratio is lower than the fourth preset threshold and the second ratio is lower than the fourth preset threshold, determine that the number of units to be turned on is the third quantity;

[0035] Among them, the first preset threshold, the second preset threshold, the third preset threshold, and the fourth preset threshold decrease in sequence; the first quantity, the second quantity, and the third quantity decrease in sequence.

[0036] For the first preset range, the second preset range, the first preset threshold, the second preset threshold, the third preset threshold, and the fourth preset threshold, as well as the first quantity, the second quantity, and the third quantity in the above Steps 11 to 14, they can be set accordingly according to actual requirements. In a specific example, if the first preset threshold is 80%, and the first preset range is 50% - 80%, then the second preset threshold is 80% and the first quantity is 2 / 3 of all the fans; if the second preset range is 20% - 50%, then the third preset threshold is 50% and the second quantity is 1 / 3 of all the fans; if the fourth preset threshold is 20%, then the third quantity is 1.

[0037] Furthermore, in a specific example, the above Steps 11 to 14 can be the following several situations:

[0038] 1) If the number N of rooms with air supply turned on exceeds 80% of the total number of rooms with air supply, or the air supply volume V exceeds 80% of the allowable air supply volume when the unit operates at full load, then first turn on all the fans and adjust the rotational speeds of each fan to reach the required air supply volume.

[0039] 2) If the number of rooms with air supply turned on is 50 - 80% and the air supply volume does not exceed 80% of the allowable air supply volume when the unit operates at full load, or the number of rooms with air supply turned on does not exceed 80% and the air supply volume is 50 - 80% of the allowable air supply volume when the unit operates at full load, then first turn on 2 / 3 of the fans and adjust the rotational speeds of each fan to reach the required air supply volume.

[0040] 3) If the number of rooms with air supply turned on is 20 - 50% and the air supply volume does not exceed 50% of the allowable air supply volume when the unit operates at full load, or the number of rooms with air supply turned on does not exceed 50% and the air supply volume is 20 - 50% of the allowable air supply volume when the unit operates at full load, then first turn on 1 / 3 of the fans and adjust the rotational speeds of each fan to reach the required air supply volume.

[0041] 4) If the number of rooms with air supply turned on is less than 20% and the air supply volume is less than 20% of the allowable air supply volume when the unit operates at full load, then turn on 1 fan first and adjust the rotational speed of each fan to reach the required air supply volume.

[0042] It can be seen that in this application, the number of fans to be turned on currently can be preliminarily determined according to the rooms that need air supply currently and the required air supply volume. However, the number of fans turned on at this time is not necessarily the number that enables the best fan efficiency. It should be noted that it is not the case that the higher or lower the fan rotational speed, the higher the fan efficiency. As Figure 2 shown, the best fan efficiency is about 75%, and the higher state range can be taken as 72% - 75%. If 5 fans are turned on, the total air supply volume is 10,000, and the fan rotational speed is 2,000, then the air volume of a single fan is 2,000, and the corresponding fan efficiency is 68%. That is, if the rotational speed exceeds a certain value or is lower than a certain value, the fan efficiency will become lower and lower. Therefore, a balance point needs to be found. That is, if the rotational speed of the fans with the number of fans turned on determined in advance is low and the fan efficiency is low, then the number of fans turned on can be further reduced to increase the fan rotational speed to improve the fan efficiency; or if the rotational speed of the fans with the number of fans turned on determined in advance is high, but the fan efficiency is still not high, then the number of fans turned on can be further increased to reduce the fan rotational speed, thereby improving the fan efficiency.

[0043] In an alternative implementation manner of the embodiment of this application, for the method of starting the fans corresponding to the number of fans turned on involved in step 103 above, it can further include:

[0044] Step 21, determine the relative positions of all fans in the fan coil system;

[0045] Step 22, when the number of fans turned on is not equal to 1 and not equal to the total number of fans, based on the relative positions, start the fans with the number of fans turned on whose positions are spaced apart from each other.

[0046] It can be seen that in this application, when only some fans are turned on, the uniformity of the air field and heat exchange is considered first. That is, it is necessary to start the fans with the number of fans turned on whose positions are spaced apart from each other. Specifically, the fans located at symmetrical positions and as far apart as possible can be turned on to avoid uneven heat exchange between the surface cooler and the air supply and the flow field interference between the fans as much as possible. Its system structure is as Figure 3 shown. Further, since the optimal water path for heat exchange of the surface cooler is the countercurrent form of bottom inlet and top outlet, the water temperature at the lower part of the surface cooler is lower during refrigeration. Therefore, it is more beneficial to turn on the fans located below first to improve the refrigeration efficiency. Specifically, as Figure 4 shown, taking 6 fans as an example, when 1 fan operates, turn on fan No. 2; when 2 fans operate, turn on fans No. 1 / 3; when 3 fans operate, turn on fans No. 1 / 3 / 5; when 4 fans operate, turn on fans No. 1 / 3 / 4 / 6; when 5 fans operate, turn on fans No. 1 / 2 / 3 / 4 / 6.

[0047] In yet another alternative embodiment of the embodiments of the present application, for the method of determining whether to adjust the opening quantity and the fan speed according to the fan efficiency and / or the fan speed of the fan involved in step 104 above, it may further include:

[0048] Step 31, when the fan efficiency of the started fan is within a third preset range, control the fan to continue running at the current speed, where the third preset range represents a fan efficiency range that meets the expectation;

[0049] In this regard, in a specific example, as Figure 2 shown, the best efficiency of the fan is about 75%, and the higher state range can be 72% - 75%. Then the third preset range can specifically be 72% - 75%. That is, if the current fan efficiency is 72%, although it is not the best efficiency, it is relatively close to the best efficiency. At this time, there is no need to adjust the fan speed or the opening quantity of the fan, and the air supply can be directly carried out at the current speed and opening quantity.

[0050] Step 32, when the fan efficiency of the started fan is within a fourth preset range and the fan speed is within a fifth preset range, control the fan to continue running at the current speed, where the fourth preset range represents a fan efficiency range that does not meet the expectation, and the fifth preset range represents that the fan speed is in a high-speed range;

[0051] Taking Figure 2 as an example, the fourth preset range can be a range where the fan efficiency is lower than 70%, such as 40% - 60%, or a larger range of 20% - 70% can be set as the range where the fan efficiency does not meet the expectation. The high-high speed range in the present application can refer to a range higher than 3200 r / min, and the low-speed range can refer to a range lower than 1600 r / min.

[0052] For step 33, it is taken that all the fans are started in advance as an example. That is, if the fan efficiency does not meet the expectation after all the fans are started, as Figure 2 shown, the fan efficiency is 50%. At this time, the fan speed is relatively high, that is, there is no room to add another fan to reduce the fan speed and improve the fan efficiency. Therefore, when it is necessary to meet the current air supply volume, starting all the current fans is the best choice, even if the fan efficiency is not high at this time. If not all the fans are started currently, and the fan efficiency is 50% at this time, then the fan speed is relatively high. In this case, the opening quantity of the fan can be increased to improve the fan efficiency and reduce the fan speed. That is, when the fan efficiency of the started fan is within the fourth preset range and the fan speed is within the fifth preset range, it can also be to increase the opening quantity of the fan to reduce the fan speed and improve the fan efficiency at the same time.

[0053] Step 33: When the rotational speed of the started fans is within the sixth preset range, close some of the started fans, adjust the rotational speed of the fans so that the generated air supply volume meets the required air supply volume, and determine whether to continue adjusting the number of started fans and the rotational speed of the fans according to the fan efficiency and rotational speed of the started fans after closing. Herein, the sixth preset range indicates that the rotational speed of the fans is in the low rotational speed range.

[0054] As can be seen from this step 33, if the current fans are in the lower range, it indicates that at this time, the number of started fans can be reduced and the rotational speed of the fans can be increased to improve the fan efficiency. During the process of reducing the number of fans, it is not the case that the more fans are reduced, the higher the rotational speed of the fans and the higher the fan efficiency. It is necessary to make comparisons cyclically. For example, compare the fan efficiency after reducing one fan from the current number of started fans with that before the reduction. If the efficiency is higher after reducing one fan, the number of started fans can be continuously reduced, and the fan efficiency before and after the reduction can be continuously compared until the number of started fans with the best fan efficiency is found. For example, if the fan efficiency after reducing two fans is higher than that after reducing one fan and that after reducing three fans, the plan of reducing the number of started fans by two is selected.

[0055] Based on this, for the method of determining whether to continue adjusting the number of started fans and the rotational speed of the fans according to the fan efficiency and rotational speed of the started fans after closing involved in the above step 33, it can further include:

[0056] Step 41: When it is determined that the fan efficiency of the started fans after closing is within the third preset range, control the fans to continue running at the current rotational speed;

[0057] Step 42: When it is determined that the rotational speed of the started fans after closing is within the fifth preset range, restart some of the closed fans and control the rotational speed of the restarted fans to run within the sixth preset range;

[0058] Step 43: When it is determined that the fan efficiency of the started fans after closing is within the fourth preset range and the air volume generated by the currently started fans is lower than the required air supply volume, adjust the number of started fans and the rotational speed of the fans according to the current number or current rotational speed of the started fans.

[0059] As can be seen from the above steps 41 to 43, after closing some of the fans, if the fan efficiency is in the higher state range, in a specific example Figure 2As shown, when the fan efficiency is between 72% and 75%, it indicates that the fan efficiency is already in a better state at this time, and there is no need to continue adjusting the number of fans in operation. Then the fan can continue to operate at this speed and the current number of fans in operation. However, it is also possible that after the fan is turned off, if the fan speed is in the ultra-high range or reaches the maximum speed and still cannot meet the required air volume, priority should be given to considering increasing the reliability of the fan operation by starting one more fan to operate at a low speed. Thus, it can be seen that in this application, it is still necessary to first ensure the required air supply volume, and on the premise of ensuring the required air supply volume, adjust the fan efficiency. In addition, after the fan is turned off, if the current fan efficiency is still in a lower range and still cannot reach a better operating state at this time, there are two possibilities. One is that the fan efficiency after turning off is lower than before, and it is also possible that the fan efficiency after turning off is higher than before. If it is lower, it means that the fan operation plan before turning off was already a better one. If it is higher, it means that the fan can be further turned off to further determine whether the fan efficiency is higher after turning off. Based on this, for the method of adjusting the number of fans in operation and the fan speed according to the current number or current speed of the started fans involved in step 43 above, it can further include:

[0060] Step 51, when it is determined that the fan efficiency of the started fans after turning off is within the fourth preset range and the fan speed is within the fifth preset range, compare the current fan efficiency with the fan efficiency before turning off, and select the number of fans with higher fan efficiency for air supply;

[0061] Step 52, when it is determined that the fan efficiency of the started fans after turning off is within the fourth preset range and the fan speed is within the sixth preset range, continue to turn off the currently started fans, compare the current fan efficiency with the fan efficiency before turning off, and select the number of fans with higher fan efficiency for air supply;

[0062] Step 53, when the current number of fans in operation is 1, and the fan efficiency is within the fourth preset range, and the fan speed is within the sixth preset range, maintain the speed of the current fan and continue to operate.

[0063] As can be seen from the above steps 51 to 53, if the fan efficiency is in a lower state range and the fan speed is in a higher range, compare the fan efficiency with that of starting one more fan to select the better fan efficiency scheme between the two. If the fan efficiency is in a lower state range and the fan speed is in a lower range, then turn off one more fan until the fan efficiency is in a higher state range or the optimal fan operation plan is selected. If only one fan is left in operation, the fan efficiency point is still in a lower state range and the fan speed is in a lower range, then maintain this speed of operation to ensure the required air supply volume.

[0064] In the embodiments of the present application, for the method of determining the air supply volume required for the room to be air supplied in step 101 above, it may further include:

[0065] Step 61, determining the air supply volume required for the room to be air supplied based on the first temperature difference value, the second temperature difference value, the air density, the specific heat capacity of air, and a preset coefficient; wherein, the first temperature difference value refers to the difference between the initial temperature of the room and the set temperature, and the second temperature difference value is the difference between the air supply temperature and the set temperature.

[0066] It can be seen that by calculating the air supply volume according to the actual temperature, set temperature and air supply temperature difference of each room, there is the following relational expression in a specific example:

[0067] η*(ΔT1 - t1)*Q = V*ρ*c*ΔT

[0068] Wherein, ΔT1 is the difference between the actual temperature of the initial room and the set temperature; t1 is the preset reference value of the difference between the actual temperature of the initial room and the set temperature; Q is the standard cooling load of a single room (unit: W or kJ / s), that is, the cooling load when ΔT1 = t1; η is the correction coefficient of the actual cooling load and the standard cooling load; V is the air supply volume, unit m 3 / s; ρ is the air density (about 1.2 kg / m 3 ); c is the specific heat capacity of air (about 1.005 kJ / kg·K); ΔT is the temperature difference between the air supply and the set temperature (unit: °C).

[0069] From the above formula, V = η*(ΔT1 - t1)*Q / (ρ*c*ΔT) can be obtained

[0070] It should be noted that t1, Q, and η are all empirical values, that is, the preset coefficient in the present application may include t1, Q, and η. Therefore, the air supply volume V required for the room to be air supplied can be determined based on the first temperature difference value, the second temperature difference value, the air density, the specific heat capacity of air, and the preset coefficient.

[0071] Corresponding to the above Figure 1 , the present application also provides a control device for a fan in a fan coil system, as Figure 5 shown, the device includes:

[0072] The first determination module 502 is used to determine the number of rooms that need to be air supplied, and to determine the air supply volume required for the rooms to be air supplied;

[0073] The second determination module 504 is used to determine the number of fans to be turned on in the fan coil system based on the first ratio of the number of rooms that need to be air supplied to the total number of all rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system running at full load;

[0074] The first processing module 506 is configured to start the fans corresponding to the opening quantity and adjust the rotational speeds of the started fans so that the air supply volume reaches the required air supply volume;

[0075] The second processing module 508 is configured to determine whether to adjust the opening quantity and the rotational speed of the fans according to the fan efficiency and / or the rotational speed of the started fans, wherein the air supply volume generated by all the opened fans after adjustment meets the required air supply volume.

[0076] Through the device according to the embodiment of the present application, after determining the number of rooms to be air-supplied and the required air supply volume of the rooms to be air-supplied, the opening quantity of the fans in the fan coil system can be determined based on the first ratio of the number of rooms to be air-supplied to the number of all rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system under full-load operation, and the fans corresponding to the opening quantity are started to adjust the rotational speeds of the started fans so that the air supply volume reaches the required air supply volume. Finally, it is determined whether to adjust the opening quantity and the rotational speed of the fans according to the fan efficiency and / or the rotational speed of the fans, so that the fan efficiency is also in the best state under the current conditions while meeting the air volume. For example, if there are 8 fans in total currently, based on the number of air-supplied rooms and the required air supply volume, it is determined that 5 fans are needed for air supply. At this time, the rotational speed of the fans is relatively low, indicating that the fans are not in the best state. One fan can be reduced and the fan rotational speed can be prompted, and then the fan efficiency is determined. If the fan efficiency is still relatively low at this time, the opening quantity of the fans is continuously reduced, and after comparison before and after, a scheme with the highest fan efficiency is selected for air supply. For example, when 3 fans currently provide the required air supply volume, the fan efficiency is higher than that when 2, 4, or 5 fans are opened. Thus, it can be seen that in the present application, after the fans are started, the number of fans can be adjusted according to the current fan efficiency and rotational speed, so that the fan efficiency is the most suitable while meeting the air volume, thereby saving energy consumption.

[0077] In an alternative implementation of the embodiment of the present application, the second determination module of the embodiment of the present application may further include: a first processing unit, configured to turn on all the fans in the fan coil system when the first ratio exceeds the first preset threshold and the second ratio exceeds the first preset threshold; a second processing unit, configured to determine that the number of fans to be turned on is the first number when the first ratio is within the first preset range and the second ratio is lower than the second preset threshold, or when the first ratio is lower than the second preset threshold and the second ratio is within the first preset range; wherein the second preset threshold is the maximum value within the first preset range; a third processing unit, configured to determine that the number of fans to be turned on is the second number when the first ratio is within the second preset range and the second ratio is lower than the third preset threshold, or when the first ratio is lower than the third preset threshold and the second ratio is within the second preset range; wherein the third preset threshold is the maximum value within the second preset range; a fourth processing unit, configured to determine that the number of fans to be turned on is the third number when the first ratio is lower than the fourth preset threshold and the second ratio is lower than the fourth preset threshold; wherein the first preset threshold, the second preset threshold, the third preset threshold, and the fourth preset threshold decrease in sequence; and the first number, the second number, and the third number decrease in sequence.

[0078] In an alternative implementation of the embodiment of the present application, the first processing module of the embodiment of the present application may further include: a first determination unit, configured to determine the relative positions of all the fans in the fan coil system; a fifth processing unit, configured to, when the number of fans to be turned on is not equal to 1 and not equal to the total number of fans, start the fans with the number of fans to be turned on whose positions are spaced apart based on the relative positions.

[0079] In an alternative implementation of the embodiment of the present application, the second processing module of the embodiment of the present application may further include: a sixth processing unit, configured to control the fan to continue running at the current speed when the fan efficiency of the started fan is within the third preset range, wherein the third preset range represents the fan efficiency range that meets the expectation; a seventh processing unit, configured to control the fan to continue running at the current speed when the fan efficiency of the started fan is within the fourth preset range and the speed of the fan is within the fifth preset range, wherein the fourth preset range represents the fan efficiency range that does not meet the expectation, and the fifth preset range represents that the speed of the fan is in the high-speed range; an eighth processing unit, configured to, when the speed of the started fan is within the sixth preset range, turn off some of the started fans, adjust the fan speed so that the generated air supply volume meets the required air supply volume, and determine whether to continue to adjust the number of fans to be turned on and the fan speed based on the fan efficiency and the fan speed of the started fans after turning off; wherein the sixth preset range represents that the speed of the fan is in the low-speed range.

[0080] In an alternative embodiment of the embodiment of the present application, the eighth processing unit of the embodiment of the present application may further include: a first processing subunit, configured to control the blower to continue running at the current speed when it is determined that the blower efficiency of the blower started after shutdown is within a third preset range; a second processing subunit, configured to restore some of the shut-down blowers and control the restored blowers to run within a sixth preset range when it is determined that the speed of the blower started after shutdown is within a fifth preset range; a third processing subunit, configured to adjust the number of blowers to be turned on and the blower speed according to the current number or current speed of the blower started after shutdown when it is determined that the blower efficiency of the blower started after shutdown is within a fourth preset range.

[0081] In an alternative embodiment of the embodiment of the present application, the third processing subunit of the embodiment of the present application is configured to perform the following steps: when it is determined that the blower efficiency of the blower started after shutdown is within a fourth preset range and the blower speed is within a fifth preset range, compare the current blower efficiency with the blower efficiency before shutdown, and select the number of blowers with higher blower efficiency for air supply; when it is determined that the blower efficiency of the blower started after shutdown is within a fourth preset range and the blower speed is within a sixth preset range, continue to turn off the currently started blowers, compare the current blower efficiency with the blower efficiency before shutdown, and select the number of blowers with higher blower efficiency for air supply; when the current number of turned-on blowers is 1, the blower efficiency is within a fourth preset range, and the blower speed is within a sixth preset range, maintain the speed of the current blower and continue running.

[0082] In an alternative embodiment of the embodiment of the present application, the first determination module of the embodiment of the present application may further include: a second determination unit, configured to determine the required air supply volume of the room to be supplied with air based on a first temperature difference value, a second temperature difference value, air density, specific heat capacity of air, and a preset coefficient; where the first temperature difference value is the difference between the initial temperature of the room and the set temperature, and the second temperature difference value is the difference between the air supply temperature and the set temperature.

[0083] As Figure 6 shown, the embodiment of the present application provides an air conditioning device, including a processor 611, a communication interface 612, a memory 613, and a communication bus 614, where the processor 611, the communication interface 612, and the memory 613 communicate with each other through the communication bus 614.

[0084] The memory 613 is used to store a computer program.

[0085] In one embodiment of the present application, when the processor 611 executes the program stored on the memory 613, it implements the control method for the fan in the fan coil unit system provided in any of the foregoing method embodiments, and the functions it performs are similar, so details are not described herein again.

[0086] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the control method for the fan in the fan coil unit system provided in any of the foregoing method embodiments.

[0087] The device embodiments described above are merely illustrative. 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 to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the related technology, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0089] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be executed in the specific order described or illustrated, unless the execution order is explicitly stated. It should also be understood that alternative or additional steps may be used.

[0090] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A control method for a fan in a fan coil unit system, characterized in that, Including: Determine the number of rooms that need to be supplied with air, and determine the air supply volume required for the rooms to be supplied with air; Based on the first ratio of the number of rooms that need to be supplied with air to the total number of rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system operating at full load, determine the number of fans to be turned on in the fan coil system; Start the fans corresponding to the number of fans to be turned on, and adjust the rotational speed of the started fans so that the air supply volume reaches the required air supply volume; Determine whether to adjust the number of fans to be turned on and the rotational speed of the fans according to the fan efficiency and / or rotational speed of the started fans, wherein the air supply volume generated by all the turned-on fans after adjustment meets the required air supply volume.

2. The method according to claim 1, wherein Based on the first ratio of the number of rooms that need to be supplied with air to the total number of rooms and the second ratio of the currently required air supply volume to the air supply volume generated by the fan coil system operating at full load, determining the number of fans to be turned on in the fan coil system includes: When the first ratio exceeds a first preset threshold and the second ratio exceeds the first preset threshold, turn on all the fans in the fan coil system; When the first ratio is within a first preset range and the second ratio is lower than a second preset threshold, or when the first ratio is lower than the second preset threshold and the second ratio is within the first preset range, determine the number of fans to be turned on as a first quantity; wherein, the second preset threshold is the maximum value within the first preset range; When the first ratio is within a second preset range and the second ratio is lower than a third preset threshold, or when the first ratio is lower than the third preset threshold and the second ratio is within the second preset range, determine the number of fans to be turned on as a second quantity; wherein, the third preset threshold is the maximum value within the second preset range; When the first ratio is lower than a fourth preset threshold and the second ratio is lower than the fourth preset threshold, determine the number of fans to be turned on as a third quantity; Wherein, the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold decrease in sequence; the first quantity, the second quantity and the third quantity decrease in sequence.

3. The method according to claim 1, wherein Starting the fans corresponding to the number of fans to be turned on includes: Determine the relative positions of all the fans in the fan coil system; When the number of fans to be turned on is not equal to 1 and not equal to the total number of fans, based on the relative positions, start the number of fans to be turned on with positions spaced apart from each other.

4. The method according to claim 1, characterized in that, Determining whether to adjust the number of fans to be turned on and the rotational speed of the fans according to the fan efficiency and / or rotational speed of the fans includes: When the fan efficiency of the started fans is within a third preset range, control the fans to continue running at the current rotational speed, wherein the third preset range represents a range of fan efficiency that meets the expectation; When the fan efficiency of the started fan is within the fourth preset range and the rotational speed of the fan is within the fifth preset range, control the fan to continue running at the current rotational speed, where the fourth preset range represents a fan efficiency range that does not meet expectations, and the fifth preset range represents that the fan rotational speed is in a high rotational speed interval; When the rotational speed of the started fan is within the sixth preset range, by shutting down some of the started fans and adjusting the fan rotational speed so that the generated air supply volume meets the required air supply volume, and determine whether to continue adjusting the number of started fans and the fan rotational speed according to the fan efficiency and fan rotational speed of the started fans after shutdown, where the sixth preset range represents that the fan rotational speed is in a low rotational speed interval.

5. The method according to claim 4, characterized in that Determine whether to continue adjusting the number of started fans and the fan rotational speed according to the fan efficiency and fan rotational speed of the started fans after shutdown, including: When it is determined that the fan efficiency of the started fans after shutdown is within the third preset range, control the fan to continue running at the current rotational speed; When it is determined that the rotational speed of the started fans after shutdown is within the fifth preset range and the air volume generated by the currently started fans is lower than the required air supply volume, restart some of the shut-down fans and control the rotational speed of the restarted fans to run within the sixth preset range; When it is determined that the fan efficiency of the started fans after shutdown is within the fourth preset range, adjust the number of started fans and the fan rotational speed according to the current number or current rotational speed of the started fans.

6. The method according to claim 5, characterized in that, Adjust the number of started fans and the fan rotational speed according to the current number or current rotational speed of the started fans, including: When it is determined that the fan efficiency of the started fans after shutdown is within the fourth preset range and the fan rotational speed is within the fifth preset range, compare the current fan efficiency with the fan efficiency before shutdown and select the number of fans with higher fan efficiency for air supply; When it is determined that the fan efficiency of the started fans after shutdown is within the fourth preset range and the fan rotational speed is within the sixth preset range, continue to shut down the currently started fans, compare the current fan efficiency with the fan efficiency before shutdown, and select the number of fans with higher fan efficiency for air supply; When the number of currently started fans is 1, the fan efficiency is within the fourth preset range, and the fan rotational speed is within the sixth preset range, maintain the rotational speed of the current fan and continue running.

7. The method according to claim 1, characterized in that, Determine the required air supply volume of the room to be air-supplied, including: Determine the required air supply volume of the room to be air-supplied based on the first temperature difference value, the second temperature difference value, the air density, the specific heat capacity of air, and a preset coefficient; where the first temperature difference value is the difference between the initial temperature of the room and the set temperature, and the second temperature difference value is the difference between the air supply temperature and the set temperature.

8. A control device for a fan in a fan coil unit system, characterized in that, including: A first determination module for determining the number of rooms that need to be air-supplied and determining the required air supply volume of the room to be air-supplied; A second determination module, configured to determine the number of fans to be turned on in the fan coil system based on a first ratio of the number of rooms to be supplied with air to the total number of rooms and a second ratio of the currently required air supply volume to the air supply volume generated when the fan coil system operates at full load; A first processing module, configured to start the fans corresponding to the number of fans to be turned on and adjust the rotational speeds of the started fans so that the air supply volume reaches the required air supply volume; A second processing module, configured to determine whether to adjust the number of fans to be turned on and the rotational speeds of the fans according to the fan efficiency and / or the rotational speeds of the started fans, wherein the air supply volume generated by all the started fans after adjustment meets the required air supply volume.

9. An air conditioning device, comprising: At least one communication interface; At least one bus connected to the at least one communication interface; At least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute the control method for the fans in the fan coil system according to any one of claims 1 to 7 above.

10. A computer storage medium storing computer-executable instructions for executing the control method for the fans in the fan coil system according to any one of claims 1 to 7 above.

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