Method for optimizing the hairpin tube pitch of a heat exchanger and heat exchanger

Abstract

The application relates to the technical field of air conditioners, and discloses a method for optimizing the spacing of hairpin tubes of a heat exchanger, which comprises the following steps: obtaining an inlet and outlet temperature difference coefficient of the hairpin tubes, and correcting the spacing of the hairpin tubes according to the inlet and outlet temperature difference coefficient of the hairpin tubes until the inlet and outlet temperature difference coefficient of the hairpin tubes reaches a preset target, if the inlet and outlet temperature difference coefficient does not reach the preset target. The method can optimize the spacing of the hairpin tubes of the heat exchanger, and can effectively improve the uniformity of air field distribution of the heat exchanger when the inlet and outlet temperature difference coefficient of the hairpin tubes reaches the preset target, thereby improving the heat exchange efficiency of the heat exchanger. The application further discloses a heat exchanger.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, for example to a method for optimizing the hairpin tube spacing of a heat exchanger and a heat exchanger. Background Technology

[0002] Currently, in the field of air conditioning technology, for top-discharge multi-split air conditioners, each component has a certain degree of interference with the airflow distribution of the heat exchanger. The airflow is driven by the top fan, and overall, the air velocity at the top of the heat exchanger is relatively high, while the air velocity at the bottom is relatively low, resulting in a highly uneven airflow distribution. This leads to poor heat exchange at the bottom of the heat exchanger in the top-discharge multi-split air conditioner, thus reducing the overall heat exchange efficiency of the heat exchanger.

[0003] To address the aforementioned technical problems, a heat exchanger that employs a U-shaped heat exchanger to increase the heat exchange area and thereby improve heat exchange performance has been disclosed in related technologies.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The relevant technology uses a U-shaped heat exchanger to increase the heat exchanger area, thereby improving the heat exchange performance. However, it cannot improve the uniformity of the airflow distribution. Uneven airflow distribution is one of the important reasons affecting the heat exchange efficiency of the heat exchanger. Uneven airflow distribution will cause the improvement in heat exchange performance to fail to achieve the expected goal. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a method and a heat exchanger for optimizing the hairpin tube spacing of a heat exchanger. By optimizing the hairpin tube spacing of the heat exchanger, the uniformity of the airflow distribution in the heat exchanger is improved, thereby increasing the heat exchange efficiency of the heat exchanger.

[0008] The present invention provides a method for optimizing the hairpin tube spacing of a heat exchanger, comprising: obtaining the inlet and outlet temperature difference coefficient of the hairpin tube; if the inlet and outlet temperature difference coefficient does not reach a preset target, adjusting the hairpin tube spacing according to the inlet and outlet temperature difference coefficient of the hairpin tube until the inlet and outlet temperature difference coefficient of the hairpin tube reaches the preset target.

[0009] Optionally, the inlet and outlet temperature difference coefficient of the hairpin tube can be obtained as follows: obtain the inlet temperature value and outlet temperature value of the hairpin tube, and calculate the inlet and outlet temperature difference coefficient of the hairpin tube based on the inlet temperature value and outlet temperature value of the hairpin tube.

[0010] Optionally, the inlet and outlet temperature difference coefficient of the hairpin tube can be calculated using the following formula:

[0011] ξ=(t j,i -t j,o ) / (t a,i -t a,o )

[0012] in:

[0013] ξ is the temperature difference coefficient between the inlet and outlet of the hairpin tube;

[0014] t j,i Let J be the inlet temperature of the j-th hairpin tube;

[0015] t j,o Let J be the outlet temperature of the j-th hairpin tube;

[0016] t a,i This is the average of the inlet temperatures of all hairpin tubes;

[0017] t a,o This is the average of the outlet temperatures of all hairpin tubes.

[0018] Optionally, the spacing between the inlet and outlet temperature difference coefficients can be adjusted, including: increasing the spacing between the inlet and outlet temperature difference coefficients when they are less than a preset target; and decreasing the spacing between the inlet and outlet temperature difference coefficients when they are greater than a preset target.

[0019] Optionally, the preset target for the inlet and outlet temperature difference coefficient is [0.9, 1.1].

[0020] In some embodiments, before obtaining the inlet and outlet temperature difference coefficient of the hairpin tubes, the method further includes: performing an air supply test on the heat exchanger, and coarsely adjusting the hairpin tube spacing based on the air supply test results.

[0021] Optionally, the spacing between the hairpin tubes can be coarsely adjusted based on the air supply test results, including: coarsely adjusting the spacing between the hairpin tubes based on the preset correspondence between the wind speed and the spacing between the hairpin tubes.

[0022] Optionally, based on the air supply test results, the spacing between the hairpin tubes can be coarsely adjusted, including: reducing the spacing when the wind speed is greater than the preset value; and increasing the spacing when the wind speed is less than the preset value.

[0023] In some embodiments, before coarsely adjusting the hairpin tube spacing, the method further includes: obtaining the standard spacing of the hairpin tubes based on the material characteristics of the hairpin tubes in the heat exchanger, and arranging the hairpin tubes of the heat exchanger according to the standard spacing of the hairpin tubes.

[0024] The present invention also provides a heat exchanger comprising: hairpin tubes arranged according to the hairpin tube spacing method described above for optimizing the hairpin tube spacing of a heat exchanger.

[0025] The method and heat exchanger for optimizing the hairpin tube spacing of a heat exchanger provided in this disclosure can achieve the following technical effects:

[0026] Using the method described above for optimizing the hairpin tube spacing in a heat exchanger, the hairpin tube spacing is obtained. Arranging the hairpin tubes according to this spacing achieves a uniform airflow in the heat exchanger, thereby improving its heat exchange efficiency. This is because the wind speed distribution along the hairpin tube line represents the uniformity of the airflow distribution, and the temperature difference coefficient of the hairpin tube is correlated with the wind speed distribution along the hairpin tube line at that hairpin tube location. When the difference between the inlet and outlet temperatures of a hairpin tube is closer to the difference between the average inlet and outlet temperatures of all hairpin tubes, it indicates that the wind speed along the hairpin tube line at that hairpin tube location is closer to the average wind speed along the hairpin tube line of the entire airflow field. When the hairpin tube spacing of a heat exchanger is optimized using the above method, if the temperature difference between the inlet and outlet of each hairpin tube is close to the difference between the average inlet and outlet temperatures of all hairpin tubes, that is, when the hairpin tube temperature difference coefficient reaches the preset target, it indicates that the wind speed along the hairpin tube line at the location of each hairpin tube is close to the average wind speed along the hairpin tube line of the entire wind field. In this case, the wind field distribution of the heat exchanger is uniform, and the heat exchange efficiency of the heat exchanger will be improved when the wind field distribution is uniform.

[0027] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0028] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, wherein:

[0029] Figure 1 This is a schematic flowchart of a method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0030] Figure 2 This is a flowchart illustrating another method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0031] Figure 3 This is a flowchart illustrating another method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0032] Figure 4This is a flowchart illustrating another method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0033] Figure 5 This is a flowchart illustrating another method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0034] Figure 6 This is a flowchart illustrating another method for optimizing the hairpin tube spacing of a heat exchanger, provided in an embodiment of this disclosure.

[0035] Figure 7 This is a schematic diagram of hairpin tubes arranged at unequal intervals in a heat exchanger according to an embodiment of this disclosure.

[0036] Figure label:

[0037] 1: Card issuing tube. Detailed Implementation

[0038] To gain a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of this disclosure.

[0039] In the following technical description, for ease of explanation, numerous details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details.

[0040] In the specification and claims of this disclosure, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0041] Unless otherwise stated, the term "multiple" means two or more.

[0042] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0043] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0044] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0045] Currently, in the field of air conditioning technology, for top-discharge multi-split air conditioners, all components have a certain degree of interference with the airflow distribution of the heat exchanger. The airflow is driven by the top fan, and overall, the air velocity at the top of the heat exchanger is relatively high, while the air velocity at the bottom is relatively low, resulting in a highly uneven airflow distribution. This leads to poor heat exchange at the bottom of the heat exchanger in top-discharge multi-split air conditioners, thus reducing the overall heat exchange efficiency of the unit.

[0046] This disclosure provides a method and a heat exchanger for optimizing the hairpin tube spacing of a heat exchanger. By optimizing the hairpin tube spacing of the heat exchanger, the uniformity of the airflow distribution in the heat exchanger is improved, thereby increasing the heat exchange efficiency of the heat exchanger.

[0047] Combination Figure 1 This disclosure provides a method for optimizing the hairpin tube spacing of a heat exchanger, comprising:

[0048] Step S11: Obtain the inlet and outlet temperature difference coefficient of the carding tube 1;

[0049] Step S12: If the inlet and outlet temperature difference coefficient does not reach the preset target, the spacing of the carding tubes is adjusted according to the inlet and outlet temperature difference coefficient of the carding tube 1 until the inlet and outlet temperature difference coefficient of the carding tube 1 reaches the preset target.

[0050] Using the method described above for optimizing the hairpin tube spacing in a heat exchanger, the hairpin tube spacing is obtained. Arranging the hairpin tubes 1 according to this spacing achieves a uniform airflow in the heat exchanger, thereby improving its heat exchange efficiency. This is because the wind speed distribution along the hairpin tube 1 pipeline direction represents the uniformity of the airflow distribution. The temperature difference coefficient of the hairpin tube 1 in the heat exchanger is related to the wind speed distribution along the hairpin tube 1 pipeline direction. When the wind speed along the hairpin tube 1 pipeline direction is high, the heat exchange efficiency of the hairpin tube 1 is high, and the inlet and outlet temperature difference of each hairpin tube 1 is large. Conversely, when the wind speed along the hairpin tube 1 pipeline direction is low, the heat exchange efficiency of the hairpin tube 1 is low, and the inlet and outlet temperature difference of each hairpin tube 1 is small. When the temperature difference coefficient of each hairpin tube 1 reaches the preset target, that is, when the temperature difference coefficient of all hairpin tubes 1 is within the preset target range, the wind speed at the location of all hairpin tubes 1 is close to the average wind speed, and the distribution of the entire wind field is uniform.

[0051] Combination Figure 2 In some embodiments, a method for optimizing the hairpin tube spacing of a heat exchanger includes:

[0052] Step S21: Obtain the inlet temperature value and outlet temperature value of hairpin tube 1, and calculate the inlet and outlet temperature difference coefficient of hairpin tube 1 based on the inlet temperature value and outlet temperature value of hairpin tube 1.

[0053] Step S22: If the inlet and outlet temperature difference coefficient does not reach the preset target, the spacing of the carding tubes is adjusted according to the inlet and outlet temperature difference coefficient of the carding tube 1 until the inlet and outlet temperature difference coefficient of the carding tube 1 reaches the preset target.

[0054] It is understandable that the fluid in hairpin tube 1 of the heat exchanger enters from the inlet end of hairpin tube 1 and flows out from the outlet end of hairpin tube 1. During the entire flow process, the fluid in hairpin tube 1 exchanges heat with the outside environment, resulting in a temperature difference between the inlet and outlet ends of hairpin tube 1. The wind speed along the direction of hairpin tube 1 plays a decisive role in the heat exchange process. Higher wind speeds result in higher heat exchange efficiency, while lower wind speeds result in lower efficiency. Therefore, the temperature difference coefficient between the inlet and outlet of hairpin tube 1 is calculated using the temperature difference between the inlet and outlet temperatures. Adjusting the hairpin tube spacing based on this temperature difference coefficient ensures that the temperature difference coefficient remains within a preset target range, which is reliable for achieving a uniform airflow in the heat exchanger.

[0055] Optionally, the inlet and outlet temperature difference coefficient of hairpin tube 1 can be calculated using the following formula:

[0056] ξ=(t j,i -t j,o ) / (t a,i -t a,o )

[0057] in:

[0058] ξ is the temperature difference coefficient between the inlet and outlet of hairpin tube 1;

[0059] t j,i Let be the inlet temperature value of the j-th hairpin tube 1;

[0060] t j,o Let be the outlet temperature value of the j-th hairpin tube 1;

[0061] t a,i This is the average of the inlet temperatures of all hairpin tubes 1;

[0062] t a,o This is the average of the outlet temperatures of all hairpin tubes 1.

[0063] Combination Figure 3 In some embodiments, a method for optimizing the hairpin tube spacing of a heat exchanger includes:

[0064] Step S31: Obtain the temperature difference coefficient between the inlet and outlet of the card-operated tube 1;

[0065] Step S32: Determine whether the temperature difference coefficient between the inlet and outlet of the card-operated tube 1 reaches the preset target;

[0066] Step S33: When the temperature difference coefficient between the inlet and outlet of the carding tube 1 does not reach the preset target, the spacing between the carding tubes is adjusted according to the temperature difference coefficient between the inlet and outlet of the carding tube 1.

[0067] Step S34: When the temperature difference coefficient between the inlet and outlet of the hairpin tube 1 does not reach the preset target, the optimization is completed, and the hairpin tubes 1 of the heat exchanger are arranged according to the optimized hairpin tube spacing.

[0068] It is understandable that the wind speed distribution along the direction of hairpin tube 1 can represent the uniformity of the wind field distribution, and the temperature difference coefficient of hairpin tube 1 in the heat exchanger is related to the wind speed distribution along the direction of hairpin tube 1 in the wind field where hairpin tube 1 is located. When the difference between the inlet temperature and the outlet temperature of hairpin tube 1 in the heat exchanger is closer to the difference between the average inlet temperature and the average outlet temperature of all hairpin tubes 1, it indicates that the wind speed along the direction of hairpin tube 1 at the location of hairpin tube 1 is closer to the average wind speed of the entire wind field. When optimizing the hairpin tube spacing of a heat exchanger using the above method, if the difference between the inlet and outlet temperatures of each hairpin tube 1 is close to the difference between the average inlet and outlet temperatures of all hairpin tubes 1, that is, when the temperature difference coefficient of hairpin tube 1 reaches the preset target, it can be said that the wind speed along the direction of hairpin tube 1 at the location of each hairpin tube 1 is close to the average wind speed along the direction of hairpin tube 1 in the entire wind field. In this case, the wind field distribution of the heat exchanger is uniform, and the optimization is complete.

[0069] Combination Figure 4 Optionally, in some embodiments, a method for optimizing the hairpin tube spacing of a heat exchanger includes:

[0070] Step S41: Obtain the temperature difference coefficient between the inlet and outlet of the card-operated tube 1;

[0071] Step S42: Determine whether the temperature difference coefficient between the inlet and outlet of the card issuing tube 1 reaches the preset target;

[0072] Step S43: When the temperature difference coefficient between the inlet and outlet of the carding tube 1 is less than the preset target, increase the spacing between the carding tubes; when the temperature difference coefficient between the inlet and outlet is greater than the preset target, decrease the spacing between the carding tubes.

[0073] Step S44: When the temperature difference coefficient between the inlet and outlet of the hairpin tube 1 reaches the preset target, the optimization is completed. The hairpin tubes 1 of the heat exchanger are arranged according to the optimized hairpin tube spacing.

[0074] It is understandable that the efficiency of heat exchange between hairpin tube 1 and the outside environment is affected by wind speed; the higher the wind speed along the direction of hairpin tube 1, the higher the heat exchanger's efficiency. After obtaining the inlet and outlet temperature difference coefficients, it is necessary to determine whether the inlet and outlet temperature difference coefficients meet the preset target. When the inlet and outlet temperature difference coefficients meet the preset target, it means that the wind speed along the direction of hairpin tube 1 at the location of hairpin tube 1 is basically the same as or very close to the average wind speed along the direction of hairpin tube 1 in the entire heat exchanger's air field. Therefore, there is no need to adjust the hairpin tube spacing. When the inlet and outlet temperature difference coefficient is less than the preset target, it indicates that the temperature difference between the inlet and outlet is less than the difference between the average inlet temperature and the average outlet temperature of the hairpin tube 1 in the entire heat exchanger's air field. This indicates that the heat exchange efficiency of the hairpin tube 1 is low, meaning that the wind speed along the hairpin tube 1 pipeline at the location of the hairpin tube 1 is less than the average wind speed of the entire heat exchanger's air field along the hairpin tube 1 pipeline. The heat exchange efficiency can be improved by increasing the hairpin tube spacing and reducing resistance, thereby increasing the wind speed along the hairpin tube 1 pipeline at the location of the hairpin tube 1. When the inlet and outlet temperature difference coefficient is greater than the preset target, it indicates that the temperature difference between the inlet and outlet is greater than the difference between the average inlet temperature and the average outlet temperature of the hairpin tube 1 in the entire heat exchanger's air field. This further indicates that the wind speed along the direction of the hairpin tube 1 at the location of the hairpin tube 1 is greater than the average wind speed of the entire heat exchanger's air field. The wind speed along the direction of the hairpin tube 1 at the location of the hairpin tube 1 can be reduced by decreasing the spacing between the hairpin tubes and increasing the resistance, thereby achieving uniformity in the distribution of the entire air field and improving the heat exchanger's exchange efficiency.

[0075] Optionally, the preset target for the inlet and outlet temperature difference coefficient is [0.9, 1.1].

[0076] Combination Figure 5 Optionally, in some embodiments, a method for optimizing the hairpin tube spacing of a heat exchanger includes:

[0077] Step S51: Perform an air supply test on the heat exchanger, and make a rough adjustment to the hairpin tube spacing based on the air supply test results.

[0078] Step S52: Obtain the inlet and outlet temperature difference coefficient of the card issuing tube 1;

[0079] Step S53: If the inlet and outlet temperature difference coefficient does not reach the preset target, the spacing of the carding tube is adjusted according to the inlet and outlet temperature difference coefficient of the carding tube 1 until the inlet and outlet temperature difference coefficient of the carding tube 1 reaches the preset target.

[0080] It is understandable that by conducting air supply tests on the heat exchanger and coarsely adjusting the hairpin tube spacing based on the test results, the coarsely adjusted hairpin tube spacing of the heat exchanger can be obtained. This coarsely adjusted hairpin tube spacing can be positioned within a reasonable range. Furthermore, by optimizing the hairpin tube spacing using the temperature difference coefficient method mentioned above, the workload can be effectively reduced.

[0081] Optionally, the spacing between the hairpin tubes can be coarsely adjusted based on the air supply test results, including: coarsely adjusting the spacing between the hairpin tubes based on the preset correspondence between the wind speed and the spacing between the hairpin tubes.

[0082] In some specific application scenarios, this correspondence can be obtained by looking up a table. The table showing the correspondence between the average wind speed along the pipeline direction and the hairpin spacing maps the average wind speed along the hairpin 1 pipeline direction to the hairpin spacing. Once the average wind speed along the hairpin 1 pipeline direction at a given location of hairpin 1 is obtained, the corresponding hairpin spacing can be found by looking up the table. The hairpins 1 of the heat exchanger can then be arranged according to this spacing. Table 1 provides an exemplary illustration of the correspondence between the average wind speed along the pipeline direction and the hairpin spacing, but it is not limited to only Table 1.

[0083] Hairpin tube spacing (mm) 30 25 21 17 15

[0084] Table 1

[0085] Optionally, in some embodiments, the spacing between the hairpin tubes is coarsely adjusted based on the air supply test results, including: reducing the spacing between the hairpin tubes when the wind speed is greater than a preset value; and increasing the spacing between the hairpin tubes when the wind speed is less than a preset value.

[0086] It can be understood that hairpin duct 1 interferes with the wind field. The higher the average wind speed along the pipeline direction, the smaller the interference. When the wind speed is greater than the preset value, the spacing between hairpin ducts can be reduced, making the hairpin ducts 1 more densely arranged. Reducing the hairpin duct spacing will increase the resistance to the wind field, thereby reducing the average wind speed along the pipeline direction at the location of hairpin duct 1. Conversely, the lower the average wind speed along the pipeline direction, the greater the interference. When the average wind speed along the pipeline direction is less than the preset value, the spacing between hairpin ducts can be increased, making the hairpin ducts 1 more sparsely arranged. Increasing the hairpin duct spacing will reduce the resistance to the wind field, thereby increasing the average wind speed along the pipeline direction at the location of hairpin duct 1.

[0087] Optionally, the spacing between the hairpin tubes can be coarsely adjusted based on the air supply test results, including: coarsely adjusting the spacing between the hairpin tubes based on the preset correspondence between the wind force and the spacing between the hairpin tubes.

[0088] Combination Figure 6Optionally, in some embodiments, a method for optimizing the hairpin tube spacing of a heat exchanger includes:

[0089] Step S61: Based on the material characteristics of the hairpin tube 1 of the heat exchanger, obtain the standard spacing of the hairpin tubes, and arrange the hairpin tubes 1 of the heat exchanger according to the standard spacing of the hairpin tubes;

[0090] Step S62: Perform an air supply test on the heat exchanger, and make a rough adjustment to the hairpin spacing based on the air supply test results.

[0091] Step S63: Obtain the inlet and outlet temperature difference coefficient of the carding tube 1;

[0092] Step S64: If the inlet and outlet temperature difference coefficient does not reach the preset target, the spacing of the carding tubes is adjusted according to the inlet and outlet temperature difference coefficient of the carding tube 1 until the inlet and outlet temperature difference coefficient of the carding tube 1 reaches the preset target.

[0093] Combination Figure 7 The present invention also provides a heat exchanger comprising: hairpin tubes 1 arranged according to the hairpin tube spacing method described above for optimizing the hairpin tube spacing of the heat exchanger.

[0094] Using the method described above for optimizing the hairpin tube spacing in a heat exchanger, the hairpin tube spacing is obtained. Arranging the hairpin tubes 1 of the heat exchanger according to this spacing achieves a uniform airflow in the heat exchanger, thereby improving the heat exchange efficiency. This is because the wind speed distribution along the hairpin tube 1 pipeline direction represents the uniformity of the airflow distribution, and the temperature difference coefficient of the hairpin tube 1 of the heat exchanger is correlated with the wind speed distribution along the hairpin tube 1 pipeline direction at the location of hairpin tube 1. When the difference between the inlet and outlet temperatures of the hairpin tube 1 of the heat exchanger is closer to the difference between the average inlet and outlet temperatures of all hairpin tubes 1, it indicates that the wind speed along the hairpin tube 1 pipeline direction at that location is closer to the average wind speed along the hairpin tube 1 pipeline direction of the entire airflow. When the hairpin tube spacing of the heat exchanger is optimized using the above method, when the difference between the inlet and outlet temperatures of each hairpin tube 1 is close to the difference between the average inlet and outlet temperatures of all hairpin tubes 1, that is, when the temperature difference coefficient of hairpin tube 1 reaches the preset target, it can be said that the wind speed along the direction of hairpin tube 1 at the location of each hairpin tube 1 is close to the average wind speed along the direction of hairpin tube 1 in the entire wind field, and the wind field distribution of the heat exchanger is uniform.

[0095] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes.

[0096] Some embodiments may include or replace parts and features of other embodiments. Furthermore, the terminology used herein is for descriptive purposes only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term “and / or” as used herein refers to any and all possible combinations of one or more of the associated listed terms.

[0097] Furthermore, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Unless otherwise specified, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0098] In this document, each embodiment focuses on describing the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0099] The embodiments disclosed herein are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for optimizing the hairpin tube spacing of a heat exchanger, characterized in that, include: Obtain the inlet temperature value and outlet temperature value of the hairpin tube (1), and calculate the inlet and outlet temperature difference coefficient of the hairpin tube (1) based on the inlet temperature value and outlet temperature value of the hairpin tube (1); calculate the inlet and outlet temperature difference coefficient of the hairpin tube (1) according to the following formula: in: ξ The inlet and outlet temperature difference coefficient of the card-issuing tube (1); Let the inlet temperature of the j-th hairpin tube (1) be the value of the inlet temperature. Let J be the outlet temperature of the j-th hairpin tube (1); The average inlet temperature of all hairpin tubes (1); The average value of the outlet temperature of all hairpin tubes (1); If the inlet and outlet temperature difference coefficient does not reach the preset target, then when the inlet and outlet temperature difference coefficient is less than the preset target, the spacing of the hairpin tubes is increased; when the inlet and outlet temperature difference coefficient is greater than the preset target, the spacing of the hairpin tubes is decreased until the inlet and outlet temperature difference coefficient of the hairpin tube (1) reaches the preset target.

2. The method for optimizing the hairpin tube spacing of a heat exchanger according to claim 1, characterized in that, The preset target for the inlet and outlet temperature difference coefficient is [0.9, 1.1].

3. The method for optimizing the hairpin tube spacing of a heat exchanger according to any one of claims 1 to 2, characterized in that, Before obtaining the inlet and outlet temperature difference coefficient of the card-operated tube (1), the method further includes: Perform an air supply test on the heat exchanger, and make a rough adjustment to the hairpin spacing based on the test results.

4. The method for optimizing the hairpin tube spacing of a heat exchanger according to claim 3, characterized in that, The air supply test includes a wind speed test, and the coarse adjustment of the hairpin spacing based on the air supply test results includes: The spacing of the hairpin tubes is coarsely adjusted based on the preset correspondence between wind speed and hairpin tube spacing.

5. The method for optimizing the hairpin tube spacing of a heat exchanger according to claim 3, characterized in that, The air supply test includes a wind speed test, and the coarse adjustment of the hairpin spacing based on the air supply test results includes: When the wind speed is greater than the preset value, the spacing between the card-issuing tubes is reduced; When the wind speed is less than the preset value, the spacing between the card-issuing tubes is increased.

6. The method for optimizing the hairpin tube spacing of a heat exchanger according to claim 3, characterized in that, Before coarsely adjusting the hairpin spacing, the method further includes: Based on the material characteristics of the hairpin tubes (1) of the heat exchanger, the standard spacing of the hairpin tubes is obtained, and the hairpin tubes (1) of the heat exchanger are arranged according to the standard spacing of the hairpin tubes.

7. A heat exchanger, characterized in that, include: The hairpin tubes (1) are arranged according to the method for optimizing the hairpin tube spacing of a heat exchanger as described in any one of claims 1 to 6.

Images