An evaporative condenser, its fan frequency control method, and an air conditioning unit

Abstract

The present invention discloses an evaporative condenser, a method for controlling the fan frequency thereof, and an air-conditioning unit. Among them, the method includes: determining whether the air wet-bulb temperature at the outlet of the indoor fan is within a preset temperature range; if so, adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser; if not, adjusting the frequency of the indoor fan according to the air wet-bulb temperature at the outlet of the indoor fan, and then adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser. The present invention adjusts the frequency of the indoor fan according to the air wet-bulb temperature at the outlet of the indoor fan, and adjusts the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser. Thereby, the dynamic adjustment of the indoor fan frequency and the evaporative condenser fan frequency is realized. The possibility of poor system operation stability and poor economy caused by too high or too low fan frequency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner control, and more particularly, to an evaporative condenser, a method for controlling the fan frequency thereof, and an air conditioner unit. Background Art

[0002] In the related art, the evaporative cooling unit adjusts the fan frequency of the evaporative cooler through the temperature difference. This method cannot fully reflect the energy change process in the evaporative cooler. At present, the evaporative cooling unit fails to effectively control the air volume, resulting in problems such as high noise, uneven water-air ratio, and high energy consumption, which hinder the popularization and application of the evaporative cooling unit.

[0003] If the indoor fan frequency does not match, it will cause problems such as the indoor inlet air temperature not reaching the requirement and large fluctuations in the inlet air temperature. If the fan power of the evaporative condenser does not match, it will cause problems such as too high / low enthalpy difference and poor system operation stability in the unit.

[0004] In view of the problem that the indoor fan frequency of the evaporative cooling unit and the fan frequency of the evaporative condenser in the prior art cannot be dynamically adjusted, no effective solution has been proposed yet. Summary of the Invention

[0005] An evaporative condenser, a method for controlling the fan frequency thereof, and an air conditioner unit are provided in an embodiment of the present invention to solve the problem that the indoor fan frequency of the evaporative cooling unit and the fan frequency of the evaporative condenser in the prior art cannot be dynamically adjusted.

[0006] To solve the above technical problem, the present invention provides a method for controlling the fan frequency of an evaporative condenser. The method includes: determining whether the air wet bulb temperature at the outlet of the indoor fan is within a preset temperature range; if so, adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet of the evaporative condenser; if not, adjusting the frequency of the indoor fan according to the air wet bulb temperature at the outlet of the indoor fan, and then adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet of the evaporative condenser.

[0007] Further, before determining whether the air wet bulb temperature at the outlet of the indoor fan is within a preset temperature range, the method further includes: detecting the air wet bulb temperature at the outlet of the indoor fan through a first wet bulb thermometer provided on the indoor fan.

[0008] Further, adjusting the frequency of the indoor fan according to the air wet bulb temperature at the outlet of the indoor fan includes:

[0009] If the air wet bulb temperature T < A, the frequency of the indoor fan is adjusted using the following formula: M = M0 + α(T - A);

[0010] If the air wet-bulb temperature T > B, then the following formula is used to adjust the frequency of the indoor fan: M = M0 + α(T - B);

[0011] Where, M is the adjusted frequency of the indoor fan, M0 is the initial frequency of the indoor fan, α is an empirical coefficient, the preset temperature range is [A, B], A is the lower limit value of the wet-bulb temperature, and B is the upper limit value of the wet-bulb temperature.

[0012] Further, before adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser, the method further includes:

[0013] Detecting the air wet-bulb temperature at the inlet of the evaporative condenser through a second wet-bulb thermometer provided at the inlet of the evaporative condenser;

[0014] Detecting the air wet-bulb temperature at the outlet of the evaporative condenser through a third wet-bulb thermometer provided at the outlet of the evaporative condenser;

[0015] Substituting the air wet-bulb temperature at the inlet of the evaporative condenser and the air wet-bulb temperature at the outlet of the evaporative condenser into an interpolation function to obtain the enthalpy value of the wet air at the inlet of the evaporative condenser and the enthalpy value of the wet air at the outlet of the evaporative condenser;

[0016] Taking the difference between the enthalpy value of the wet air at the inlet of the evaporative condenser and the enthalpy value of the wet air at the outlet of the evaporative condenser to obtain the enthalpy difference between the inlet and outlet air.

[0017] Further, adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air includes: judging whether the enthalpy difference is within a preset enthalpy difference range; if not, then further adjusting the frequency of the fan of the evaporative condenser using different formulas according to the interval range where the enthalpy difference is located; if so, then there is no need to adjust the frequency of the fan of the evaporative condenser.

[0018] Further, adjusting the frequency of the fan of the evaporative condenser using different formulas according to the interval range where the enthalpy difference is located includes:

[0019] If the enthalpy difference △H < C, then the following formula is used to adjust the frequency of the fan of the evaporative condenser: P = P0 + β(△H - C);

[0020] If the enthalpy difference △H > D, then the following formula is used to adjust the frequency of the fan of the evaporative condenser: P = P0 + β(△H - D);

[0021] Where, P is the adjusted frequency of the fan of the evaporative condenser, P0 is the initial frequency of the fan of the evaporative condenser, β is an empirical coefficient, and the preset enthalpy difference range is [C, D], where C is the lower limit value of the enthalpy difference and D is the upper limit value of the enthalpy difference.

[0022] The present invention also provides an evaporative condenser, where the evaporative condenser includes:

[0023] A first wet bulb thermometer, disposed on the indoor fan, for detecting the air wet bulb temperature at the outlet of the indoor fan;

[0024] A second wet bulb thermometer, disposed at the air inlet of the evaporative condenser, for detecting the air wet bulb temperature at the air inlet of the evaporative condenser;

[0025] A third wet bulb thermometer, disposed at the air outlet of the evaporative condenser, for detecting the air wet bulb temperature at the air outlet of the evaporative condenser;

[0026] A controller, connected to the first wet bulb thermometer, the second wet bulb thermometer, and the third wet bulb thermometer, for obtaining the air wet bulb temperature at the outlet of the indoor fan and accordingly adjusting the frequency of the indoor fan; and obtaining the air wet bulb temperature at the air inlet and the air wet bulb temperature at the air outlet of the evaporative condenser and accordingly adjusting the frequency of the fan of the evaporative condenser.

[0027] The present invention also provides an air conditioning unit, where the air conditioning unit includes the above-mentioned evaporative condenser.

[0028] The present invention also provides a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the method as described above.

[0029] The present invention also provides an electronic device, which includes: one or more processors; a storage device for storing one or more programs, and 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.

[0030] Applying the technical solution of the present invention, the frequency of the indoor fan is adjusted according to the air wet bulb temperature at the outlet of the indoor fan, and the frequency of the fan of the evaporative condenser is adjusted according to the enthalpy difference between the inlet and outlet of the evaporative condenser. Thus, the dynamic adjustment of the frequency of the indoor fan and the frequency of the fan of the evaporative condenser is achieved. The possibility of poor system operation stability and poor economy caused by too high or too low fan frequency is reduced. Description of the Drawings

[0031] Figure 1 is a flowchart of a method for controlling the fan frequency of an evaporative condenser according to an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of an evaporative condenser according to an embodiment of the present invention;

[0033] Figure 3 is a schematic control principle diagram of an evaporative condenser according to an embodiment of the present invention. Specific embodiments <W

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the scope of protection of the present invention.

[0035] 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", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. "Plural" generally includes at least two.

[0036] It should be understood that the term "and / or" used herein is only a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0037] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe the wet bulb thermometer, these should not be limited to these terms. These terms are only used to distinguish the wet bulb thermometers at several different positions. For example, without departing from the scope of the embodiments of the present invention, the first wet bulb thermometer can also be called the second wet bulb thermometer, and similarly, the second wet bulb thermometer can also be called the first wet bulb thermometer.

[0038] Depending on the context, the words "if", "when" as used herein can be interpreted as "when...", "when...", "in response to determining", or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined", "in response to determining", "when detecting (stated condition or event)", or "in response to detecting (stated condition or event)".

[0039] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0040] The optional embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Embodiment 1

[0041] Figure 1 is a flowchart of a method for controlling the fan frequency of an evaporative condenser according to an embodiment of the present invention, as Figure 1 shown, the method includes the following steps:

[0042] Step S101, determine whether the air wet bulb temperature at the outlet of the indoor fan is within a preset temperature range; if so, execute step S102, if not, execute step S103;

[0043] Step S102, adjust the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser;

[0044] Step S103, adjust the frequency of the indoor fan according to the air wet bulb temperature at the outlet of the indoor fan, and then adjust the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser.

[0045] In this embodiment, the frequency of the indoor fan is adjusted according to the air wet bulb temperature at the outlet of the indoor fan, and the frequency of the fan of the evaporative condenser is adjusted according to the enthalpy difference between the inlet and outlet air of the evaporative condenser. Thus, the dynamic adjustment of the indoor fan frequency and the evaporative condenser fan frequency is achieved. The possibility of poor system operation stability and poor economy caused by too high or too low fan frequency is reduced.

[0046] In order to more accurately obtain the air wet bulb temperature at the outlet of the indoor fan, a first wet bulb thermometer is provided on the indoor fan in this embodiment, and the air wet bulb temperature at the outlet of the indoor fan is detected by the first wet bulb thermometer. Thus, the air wet bulb temperature at the outlet of the indoor fan can be accurately and timely obtained.

[0047] The preset temperature range corresponding to the air wet-bulb temperature can be set as [A, B], where A is the lower limit value of the wet-bulb temperature and B is the upper limit value of the wet-bulb temperature. If the air wet-bulb temperature is within the preset temperature range, it indicates that the temperature of the air blown by the indoor fan is appropriate, neither too high nor too low, so there is no need to adjust the fan frequency. If the air wet-bulb temperature is not within the preset temperature range, then the frequency of the indoor fan needs to be adjusted accordingly according to the temperature range where the air wet-bulb temperature is located.

[0048] 1) If the air wet-bulb temperature T < A, it means that the temperature of the air blown by the indoor fan is too low. The frequency of the indoor fan can be adjusted using the following formula: M = M0 + α(T - A), that is, reducing the frequency of the indoor fan to a suitable range, thereby increasing the inlet air temperature indoors, and finally making the air wet-bulb temperature at the outlet of the indoor fan within the preset temperature range.

[0049] 2) If the air wet-bulb temperature T > B, it means that the temperature of the air blown by the indoor fan is too high. The frequency of the indoor fan can be adjusted using the following formula: M = M0 + α(T - B), that is, increasing the frequency of the indoor fan to a suitable range, thereby reducing the inlet air temperature indoors, and finally making the air wet-bulb temperature at the outlet of the indoor fan within the preset temperature range. Here, M is the adjusted frequency of the indoor fan, M0 is the initial frequency of the indoor fan, and α is an empirical coefficient.

[0050] By adjusting the frequency of the indoor fan, the inlet air temperature indoors can be adjusted to a suitable range. After that, the frequency of the fan of the evaporative condenser can be adjusted according to the enthalpy difference between the inlet and outlet air of the evaporative condenser.

[0051] For how to determine the enthalpy difference between the inlet and outlet air of the evaporative condenser, this embodiment provides a preferred implementation manner, that is, a second wet-bulb thermometer is set at the inlet of the evaporative condenser, and a third wet-bulb thermometer is set at the outlet of the evaporative condenser. The air wet-bulb temperature at the inlet of the evaporative condenser is detected by the second wet-bulb thermometer set at the inlet of the evaporative condenser; and the air wet-bulb temperature at the outlet of the evaporative condenser is detected by the third wet-bulb thermometer set at the outlet of the evaporative condenser. Thus, the air wet-bulb temperatures at the inlet and outlet of the evaporative condenser can be accurately and timely obtained.

[0052] After that, substitute the air wet-bulb temperature at the air inlet and the air wet-bulb temperature at the air outlet of the evaporative condenser into the interpolation function to obtain the enthalpy value of the humid air at the air inlet and the enthalpy value of the humid air at the air outlet of the evaporative condenser; subtract the enthalpy value of the humid air at the air inlet from the enthalpy value of the humid air at the air outlet of the evaporative condenser to obtain the enthalpy difference between the inlet and outlet. Specifically, the interpolation function of the relationship between the enthalpy value of the humid air and the air wet-bulb temperature can be obtained by cubic polynomial fitting. That is, the relationship between the enthalpy value of the humid air and the air wet-bulb temperature is determined in advance, and the enthalpy value of the humid air can be obtained according to the air wet-bulb temperature. Based on this, the enthalpy difference between the inlet and outlet of the evaporative condenser can be obtained more accurately.

[0053] After determining the enthalpy difference between the inlet and outlet of the evaporative condenser, adjust the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet. Specifically, determine whether the enthalpy difference between the inlet and outlet is within the preset enthalpy difference range. If so, there is no need to adjust the frequency of the fan of the evaporative condenser. If not, further adjust the frequency of the fan of the evaporative condenser using different formulas according to the range of the interval where the enthalpy difference between the inlet and outlet is located.

[0054] The preset enthalpy difference range corresponding to the enthalpy difference between the inlet and outlet of the evaporative condenser can be set as [C, D], where C is the lower limit value of the enthalpy difference and D is the upper limit value of the enthalpy difference.

[0055] 1) If the enthalpy difference between the inlet and outlet △H < C, then use the following formula to adjust the frequency of the fan of the evaporative condenser: P = P0 + β(△H - C). The purpose is to reduce the fan frequency of the evaporative condenser to a suitable range to increase the enthalpy difference between the inlet and outlet of the evaporative condenser so that the enthalpy difference between the inlet and outlet is within the preset enthalpy difference range.

[0056] 2) If the enthalpy difference between the inlet and outlet △H > D, then use the following formula to adjust the frequency of the fan of the evaporative condenser: P = P0 + β(△H - D). The purpose is to increase the fan frequency of the evaporative condenser to a suitable range to reduce the enthalpy difference between the inlet and outlet of the evaporative condenser so that the enthalpy difference between the inlet and outlet is within the preset enthalpy difference range.

[0057] Among them, P is the adjusted frequency of the fan of the evaporative condenser, P0 is the initial frequency of the fan of the evaporative condenser, and β is an empirical coefficient. It should be noted that in actual applications, the empirical coefficients α and β can be taken as 2 and 1.2 respectively.

[0058] This embodiment realizes the dynamic adjustment of the indoor fan frequency and the evaporative condenser fan frequency. It improves the operation stability of the unit. Embodiment 2

[0059] This embodiment provides an evaporative condenser, including:

[0060] The first wet bulb thermometer is arranged on the indoor fan and is used to detect the air wet bulb temperature at the outlet of the indoor fan;

[0061] The second wet bulb thermometer is arranged at the air inlet of the evaporative condenser and is used to detect the air wet bulb temperature at the air inlet of the evaporative condenser;

[0062] The third wet bulb thermometer is arranged at the air outlet of the evaporative condenser and is used to detect the air wet bulb temperature at the air outlet of the evaporative condenser;

[0063] The controller is connected to the first wet bulb thermometer, the second wet bulb thermometer and the third wet bulb thermometer, and is used to obtain the air wet bulb temperature at the outlet of the indoor fan, and adjust the frequency of the indoor fan accordingly; and, obtain the air wet bulb temperature at the air inlet and the air outlet of the evaporative condenser, and adjust the frequency of the fan of the evaporative condenser accordingly.

[0064] This embodiment also provides an air conditioner unit, and this air conditioner unit includes the above-mentioned evaporative condenser.

[0065] In this embodiment, the frequency of the indoor fan is adjusted according to the air wet bulb temperature at the outlet of the indoor fan, and the frequency of the fan of the evaporative condenser is adjusted according to the enthalpy difference between the inlet and outlet of the evaporative condenser. Thus, the dynamic adjustment of the frequency of the indoor fan and the frequency of the fan of the evaporative condenser is realized. The possibility that the system operation stability and economy are poor due to too high or too low fan frequency is reduced.

[0066] Figure 2 It is a schematic structural diagram of an evaporative condenser according to an embodiment of the present invention. As Figure 2 shown, the evaporative condenser mainly includes: a variable-frequency fan 1, a nozzle 2, a heat exchange coil 3, an indoor fan 4, a controller 5, a filler 6, a water tank 7, an outlet wet bulb thermometer 8, an inlet wet bulb thermometer 9, a water pump 10, a ball valve 11, a check valve 12, and a wet bulb thermometer 13. Among them, the wet bulb thermometer 13 is used to measure the air wet bulb temperature at the outlet end of the indoor fan and feed back the signal to the controller 5. The controller 5 further adjusts the frequency of the indoor fan 4 according to the air wet bulb temperature.

[0067] The outlet wet bulb thermometer 8 and the inlet wet bulb thermometer 9 are used to measure the air wet bulb temperature at the inlet and outlet of the evaporative condenser and transmit the signal to the controller 5. The controller 5 calculates the enthalpy difference between the inlet and outlet of the evaporative condenser and adjusts the frequency of the variable-frequency fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet.

[0068] Figure 3 It is a schematic control principle diagram of an evaporative condenser according to an embodiment of the present invention. As Figure 3As shown, the controller determines whether the wet bulb temperature of the air at the outlet of the indoor fan satisfies A ≤ T ≤ B based on the acquired temperature signal. If the above determination condition is satisfied, the controller further obtains the enthalpy difference between the inlet and outlet of the evaporative condenser. If the above determination condition is not satisfied, that is, when T > B (indicating that the indoor inlet air temperature is too high), the indoor fan frequency is adjusted according to the formula M = M0 + α(T - B), and the effect is to increase the fan frequency to a suitable range and reduce the indoor inlet air temperature. When T < A (indicating that the indoor inlet air temperature is too low), the indoor fan frequency is adjusted according to the formula M = M0 + α(T - A), and the effect is to reduce the fan frequency to a suitable range and increase the indoor inlet air temperature.

[0069] After the controller completes the adjustment of the indoor fan frequency through the wet bulb temperature of the air at the outlet of the indoor fan, it makes the next determination: whether the enthalpy difference between the inlet and outlet air of the evaporative condenser satisfies C ≤ ΔH ≤ D. If the above determination condition is satisfied, the control ends. If the above determination condition is not satisfied, when ΔH < C, the fan frequency of the evaporative condenser is adjusted according to the formula P = P0 + β(ΔH - C), and the effect is to reduce the fan frequency to a suitable range to increase the enthalpy difference between the inlet and outlet air of the evaporative condenser. When ΔH > D (large heat exchange temperature difference / excessive heat exchange), the fan frequency of the evaporative condenser is adjusted according to the formula P = P0 + β(ΔH - D), and the effect is to increase the fan frequency to a suitable range to reduce the enthalpy difference between the inlet and outlet air of the evaporative condenser. After the controller completes the adjustment of the fan frequency through the enthalpy difference between the inlet and outlet air of the evaporative condenser, it again determines whether the wet bulb temperature of the air at the outlet of the indoor fan satisfies A ≤ T ≤ B. If not, it returns to adjust the frequency of the indoor fan. If satisfied, the control ends.

[0070] It should be noted that in a preferred embodiment, A can take the value of 15, B can take the value of 22, C can take the value of 20, and D can take the value of 30. That is, when 15 ≤ T ≤ 22 and 20 ≤ ΔH ≤ 30 are respectively satisfied, the fan frequency control is completed. α and β can take the values of 2 and 1.2 respectively. Generally, the initial frequencies M0 and P0 of the fan can be set to 50 (Hz). Of course, the above values are only examples and can be adjusted accordingly in specific applications. Embodiment 3

[0071] The embodiment of the present invention provides a software, which is used to execute the technical solutions described in the above embodiments and preferred embodiments.

[0072] The embodiment of the present invention provides a non - volatile computer storage medium, and the computer storage medium stores computer - executable instructions, and the computer - executable instructions can execute the fan frequency control method of the evaporative condenser in any of the above method embodiments.

[0073] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: optical discs, floppy disks, hard disks, rewritable memories, etc.

[0074] The above-mentioned product can execute the method provided by the embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in this embodiment, reference can be made to the method provided by the embodiment of the present invention.

[0075] The electronic device in the embodiment of the present invention exists in various forms, including but not limited to:

[0076] (1) Mobile communication devices: These devices are characterized by having mobile communication functions and mainly aim to provide voice and data communication. Such terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones, etc.

[0077] (2) Ultra-mobile personal computer devices: These devices belong to the category of personal computers, have computing and processing functions, and generally also have the characteristic of mobile Internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as iPad.

[0078] (3) Portable entertainment devices: These devices can display and play multimedia content. Such devices include: audio and video players (such as iPod), handheld game consoles, e-books, and smart toys and portable vehicle navigation devices.

[0079] (4) Servers: Devices that provide computing services. The composition of a server includes a processor, hard disk, memory, device bus, etc. Servers are similar to general computer architectures, but due to the need to provide highly reliable services, they have higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0080] (5) Other electronic devices with data interaction functions, such as televisions, in-vehicle large screens, etc.

[0081] 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.

[0082] 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 necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This 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 to enable 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.

[0083] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A fan frequency control method for an evaporative condenser, characterized in that: The method comprises: Determine whether the wet-bulb temperature of the air at the indoor fan outlet is within the preset temperature range; If yes, adjust the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser; If not, adjusting the frequency of the indoor fan according to the wet-bulb temperature of the air at the indoor fan outlet, and then adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser; Among them, adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser includes: judging whether the enthalpy difference between the inlet and outlet air is within a preset enthalpy difference range; if not, further adjusting the frequency of the fan of the evaporative condenser using different formulas according to the interval range of the inlet and outlet air enthalpy difference; if yes, there is no need to adjust the frequency of the fan of the evaporative condenser.

2. The method according to claim 1, characterized in that Determining whether the wet-bulb temperature of air at the indoor fan outlet is within a preset temperature range, the method further includes: The wet-bulb temperature of the air at the indoor fan outlet is detected by a first wet-bulb thermometer arranged on the indoor fan.

3. The method according to claim 1, characterized in that Adjusting the frequency of the indoor fan according to the wet-bulb temperature of the air at the indoor fan outlet includes: If the air wet bulb temperature T is less than A, the frequency of the indoor fan is adjusted using the following formula: M=M0+α(T-A); If the air wet bulb temperature T>B, the frequency of the indoor fan is adjusted using the following formula: M=M0+α(T-B); Wherein, M is the adjusted frequency of the indoor fan, M0 is the initial frequency of the indoor fan, α is an empirical coefficient, the preset temperature range is [A, B], A is the lower limit of the wet-bulb temperature, and B is the upper limit of the wet-bulb temperature.

4. The method according to claim 1, wherein Before adjusting the frequency of the fan of the evaporative condenser according to the enthalpy difference between the inlet and outlet air of the evaporative condenser, the method further includes: detecting the wet-bulb temperature of the air at the air inlet of the evaporative condenser by a second wet-bulb thermometer provided at the air inlet of the evaporative condenser; detecting the wet-bulb temperature of air at the air outlet of the evaporative condenser by means of a third wet-bulb thermometer provided at the air outlet of the evaporative condenser; Substituting the wet-bulb temperature of the air at the air inlet and the wet-bulb temperature of the air at the air outlet of the evaporative condenser into an interpolation function to obtain the enthalpy value of the moist air at the air inlet and the enthalpy value of the moist air at the air outlet of the evaporative condenser; The inlet and outlet enthalpy difference is obtained by subtracting the enthalpy value of the moist air at the air inlet and the enthalpy value of the moist air at the air outlet of the evaporative condenser.

5. The method according to claim 1, characterized in that According to the range of the inlet and outlet air enthalpy difference, different formulas are used to adjust the frequency of the fan of the evaporative condenser, including: If the inlet and outlet air enthalpy difference ΔH < C, the frequency of the fan of the evaporative condenser is adjusted using the following formula: P = P0 + β (ΔH - C); If the inlet and outlet air enthalpy difference ΔH>D, the frequency of the fan of the evaporative condenser is adjusted using the following formula: P=P0+β(ΔH-D); Among them, P is the adjusted frequency of the fan of the evaporative condenser, P0 is the initial frequency of the fan of the evaporative condenser, β is the empirical coefficient, the preset enthalpy difference range is [C, D], C is the lower limit of the enthalpy difference, and D is the upper limit of the enthalpy difference.

6. An evaporative condenser, used to implement the fan frequency control method of the evaporative condenser according to any one of claims 1 to 5, characterized in that: The evaporative condenser comprises: A first wet-bulb thermometer is provided on the indoor fan and is used to detect the wet-bulb temperature of the air at the indoor fan outlet; a second wet-bulb thermometer, disposed at the air inlet of the evaporative condenser, for detecting the wet-bulb temperature of the air at the air inlet of the evaporative condenser; a third wet-bulb thermometer, disposed at the air outlet of the evaporative condenser, for detecting the wet-bulb temperature of the air at the air outlet of the evaporative condenser; A controller is connected to the first wet-bulb thermometer, the second wet-bulb thermometer and the third wet-bulb thermometer, and is used to obtain the wet-bulb temperature of the air at the outlet of the indoor fan and adjust the frequency of the indoor fan accordingly; and to obtain the wet-bulb temperature of the air at the air inlet and the air outlet of the evaporative condenser and adjust the frequency of the fan of the evaporative condenser accordingly.

7. An air conditioning unit, characterized in that: The air conditioning unit includes the evaporative condenser according to claim 6.

8. 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 5 is implemented.

9. 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, causes the one or more processors to implement the method according to any one of claims 1 to 5.

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