Model selection method and device for heat exchanger of air conditioner and air conditioner

Abstract

The invention provides a model selection method and device for a heat exchanger of an air conditioner and the air conditioner. The method comprises the steps that based on a model selection operation instruction, the target total heat exchange coefficient, the target heat exchanger cost and the target design parameters of the heat exchanger are obtained; based on the target heat exchanger cost and the target design parameters, the heat exchange tube number threshold value range of the heat exchanger and the heat exchange coefficient threshold value range corresponding to the heat exchange tube number threshold value range are determined; and based on the heat exchange coefficient threshold value range and the target total heat exchange coefficient, the model selection strategy of the heat exchanger is determined, and the model selection strategy at least comprises the model selection total heat transfer coefficient, the model selection water flow speed, the model selection water resistance and the model selection cost. According to the method, the target heat exchanger cost and the target total heat exchange coefficient of the heat exchanger serve as the target values, the heat exchanger scheme is subjected to simulation calculation in combination with the computer, the balance and cost selection of the heat exchanger obtain the optimal solution, the different heat exchanger design schemes are compared in a unified mode, and the heat exchanger type selection design efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a method and device for selecting a heat exchanger for an air conditioner, and the air conditioner. Background Art

[0002] In the current design process for air conditioning heat exchangers, designers often rely on experience or simply borrow previously implemented solutions. These designs often do not achieve optimal performance or cost. Alternatively, design calculations based solely on performance or cost fail to balance heat exchanger performance and cost. Summary of the Invention

[0003] The present invention provides a method and device for selecting a heat exchanger for an air conditioner, and the air conditioner, so as to solve the defect that the heat exchanger design of the existing air conditioner cannot balance the thermal performance and cost.

[0004] According to a first aspect of the present invention, a method for selecting a heat exchanger for an air conditioner is provided, comprising:

[0005] Based on the selection operation instruction, obtaining a target total heat transfer coefficient, a target heat exchanger cost, and target design parameters of the heat exchanger;

[0006] Determining, based on the target heat exchanger cost and the target design parameters, a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficients corresponding to the threshold range of the number of heat exchange tubes;

[0007] Based on the heat transfer coefficient threshold range and the target total heat transfer coefficient, a selection strategy for the heat exchanger is determined, wherein the selection strategy at least includes selecting the total heat transfer coefficient, selecting the water flow rate, selecting the water resistance, and selecting the cost.

[0008] According to one embodiment of the present invention, the step of determining the threshold range of the number of heat exchange tubes of the heat exchanger specifically includes:

[0009] Determining a sample of the number of all heat exchange tubes of the heat exchanger according to an interval range corresponding to the target design parameter;

[0010] The heat exchange tube quantity threshold range is determined based on the number of heat exchange tubes corresponding to each heat exchange tube quantity sample.

[0011] Specifically, this embodiment provides an implementation method for determining a threshold range of the number of heat exchange tubes of the heat exchanger.

[0012] According to one embodiment of the present invention, the target design parameters include at least nominal cooling capacity, heat exchanger inlet water temperature, heat exchanger outlet water temperature, water side flow number, heat exchanger water flow rate range and heat exchange tube inner diameter.

[0013] Specifically, this embodiment provides an implementation method of target design parameters.

[0014] According to one embodiment of the present invention, the step of determining the threshold range of the number of heat exchange tubes of the heat exchanger further includes:

[0015] Based on the target design parameters, obtaining a heat exchange tube length and a heat exchange tube unit price of the heat exchanger, wherein the heat exchange tube unit price is a price of the heat exchange tube per unit of measurement;

[0016] determining a target number of heat exchange tubes of the heat exchanger based on the target heat exchanger cost, the heat exchange tube length, and the heat exchange tube unit price;

[0017] When the target number of heat exchange tubes satisfies the heat exchange tube number threshold range, obtaining a heat transfer coefficient threshold range corresponding to the heat exchange tube number threshold range;

[0018] When the target number of heat exchange tubes does not satisfy the threshold range of the number of heat exchange tubes, an instruction is generated to prompt resetting of the target design parameters.

[0019] Specifically, this embodiment provides an implementation method for determining a threshold range of the number of heat exchange tubes of the heat exchanger.

[0020] According to one embodiment of the present invention, the step of determining the threshold range of the number of heat exchange tubes of the heat exchanger further includes:

[0021] Based on the heat exchange tube quantity threshold range, obtaining a first heat exchange tube quantity characteristic value and a second heat exchange tube quantity characteristic value of the heat exchange tube, wherein the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value are values ​​at both ends of the heat exchange tube quantity threshold range;

[0022] Determining the first heat exchanger heat transfer coefficient and the second heat exchanger heat transfer coefficient based on the first heat exchange tube number characteristic value, the second heat exchange tube number characteristic value, and the total heat transfer coefficient function of the heat exchanger, where the first heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the first heat exchange tube number characteristic value, and the second heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the second heat exchange tube number characteristic value;

[0023] The heat transfer coefficient threshold range is determined based on the first heat exchanger heat transfer coefficient, the second heat exchanger heat transfer coefficient, and the target total heat transfer coefficient.

[0024] Specifically, this embodiment provides an implementation method for determining a threshold range of the number of heat exchange tubes of the heat exchanger.

[0025] According to one embodiment of the present invention, the step of determining the heat transfer coefficient threshold range specifically includes:

[0026] determining a first heat transfer coefficient variable factor based on the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient, wherein the first heat transfer coefficient variable factor is a difference between the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient;

[0027] determining a second heat transfer coefficient variable factor based on the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient, wherein the second heat transfer coefficient variable factor is a difference between the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient;

[0028] The heat transfer coefficient threshold range is determined based on the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor.

[0029] Specifically, this embodiment provides an implementation method for determining the heat transfer coefficient threshold range.

[0030] According to one embodiment of the present invention, the step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes:

[0031] generating the selection strategy according to the first heat exchange tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero and the first heat transfer coefficient variable factor is equal to zero;

[0032] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero, and the first heat transfer coefficient variable factor is not equal to zero, the selection strategy is generated according to the second heat exchange tube quantity characteristic value.

[0033] Specifically, this embodiment provides an implementation method for determining a selection strategy for the heat exchanger.

[0034] According to one embodiment of the present invention, the step of generating the selection strategy according to the first heat exchange tube quantity characteristic value specifically includes:

[0035] Based on the first heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the first heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity;

[0036] Based on the fact that the first characteristic value of the number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the first characteristic value of the number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes.

[0037] Specifically, this embodiment provides an implementation method for generating the selection strategy according to the characteristic value of the number of the first heat exchange tubes.

[0038] According to one embodiment of the present invention, the step of generating the selection strategy according to the second heat exchange tube quantity characteristic value specifically includes:

[0039] Based on the second heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the second heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity;

[0040] Based on the second heat exchange tube number characteristic value being greater than the target heat exchange tube number, the target heat exchange tube number is updated according to half the sum of the second heat exchange tube number characteristic value and the target heat exchange tube number, and the selection strategy is generated according to the updated target heat exchange tube number.

[0041] Specifically, this embodiment provides an implementation method for generating the selection strategy according to the characteristic value of the number of the second heat exchange tubes.

[0042] According to one embodiment of the present invention, the step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes:

[0043] Based on the heat exchange tube quantity threshold range, obtaining a third heat exchange tube quantity characteristic value of the heat exchange tube, wherein the third heat exchange tube quantity characteristic value is between the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value;

[0044] determining a third heat exchanger heat transfer coefficient based on the third heat exchange tube quantity characteristic value and the total heat transfer coefficient function of the heat exchanger, wherein the third heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the third heat exchange tube quantity characteristic value;

[0045] Based on the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient, a third heat transfer coefficient variable factor is determined, where the third heat transfer coefficient variable factor is a difference between the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient.

[0046] Specifically, this embodiment provides an implementation method for determining the selection strategy of the heat exchanger.

[0047] According to one embodiment of the present invention, the step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes:

[0048] generating the selection strategy according to the third heat exchange tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero and the third heat transfer coefficient variable factor is equal to zero;

[0049] generating the selection strategy according to the first heat transfer tube quantity characteristic value and the third heat transfer tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is less than zero;

[0050] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is greater than zero, the selection strategy is generated according to the second heat exchange tube number characteristic value and the third heat exchange tube number characteristic value.

[0051] Specifically, this embodiment provides an implementation method for determining the selection strategy of the heat exchanger.

[0052] According to one embodiment of the present invention, the step of generating the selection strategy according to the third heat exchange tube quantity characteristic value specifically includes:

[0053] Based on the third heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the third heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity;

[0054] Based on the fact that the third heat exchange tube quantity characteristic value is greater than the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to half the sum of the third heat exchange tube quantity characteristic value and the target heat exchange tube quantity, and the selection strategy is generated according to the updated target heat exchange tube quantity.

[0055] Specifically, this embodiment provides an implementation method for generating the selection strategy according to the characteristic value of the number of the third heat exchange tubes.

[0056] According to one embodiment of the present invention, the step of generating the selection strategy according to the first heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value specifically includes:

[0057] Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being less than zero, updating the third heat exchange tube quantity characteristic value according to the second heat exchange tube quantity characteristic value;

[0058] When the absolute value of the difference between the first characteristic value of the number of heat exchange tubes and the updated characteristic value of the third characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the first characteristic value of the number of heat exchange tubes is less than or equal to the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to the first characteristic value of the number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes;

[0059] When the absolute value of the difference between the first characteristic value of the number of heat exchange tubes and the updated characteristic value of the third characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the first characteristic value of the number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the first characteristic value of the number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes;

[0060] When the absolute value of the difference between the first heat exchange tube quantity characteristic value and the updated third heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

[0061] Specifically, this embodiment provides an implementation method for generating the selection strategy according to the first characteristic value of the number of heat exchange tubes and the third characteristic value of the number of heat exchange tubes.

[0062] According to one embodiment of the present invention, the step of generating the selection strategy according to the second heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value specifically includes:

[0063] Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being greater than zero, updating the third heat exchange tube quantity characteristic value according to the first heat exchange tube quantity characteristic value;

[0064] When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the updated characteristic value of the third number of heat exchange tubes being less than or equal to the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to the updated characteristic value of the third number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes;

[0065] When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the updated characteristic value of the third number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the updated characteristic value of the third number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes;

[0066] When the absolute value of the difference between the updated third heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

[0067] Specifically, this embodiment provides an implementation method for generating the selection strategy according to the second heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value.

[0068] According to one embodiment of the present invention, the step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes:

[0069] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is greater than zero, a third heat transfer tube quantity characteristic value and the third heat transfer coefficient variable factor are re-obtained based on the second heat transfer tube quantity characteristic value magnified N times, where N is a positive integer greater than or equal to 2;

[0070] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is less than zero, the third heat transfer tube number characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are re-obtained based on the first heat transfer tube number characteristic value reduced by M times, where M is a positive integer greater than or equal to 2.

[0071] Specifically, this embodiment provides an implementation method for determining the selection strategy of the heat exchanger.

[0072] According to a second aspect of the present invention, a heat exchanger selection device for an air conditioner is provided, comprising:

[0073] A parameter acquisition module, configured to acquire a target total heat transfer coefficient, a target heat exchanger cost, and target design parameters of the heat exchanger based on the selection operation instruction;

[0074] a threshold determination module, configured to determine a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficient corresponding to the threshold range of the number of heat exchange tubes based on the target heat exchanger cost and the target design parameters;

[0075] A strategy generation module is used to determine a selection strategy for the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient, wherein the selection strategy at least includes selecting the total heat transfer coefficient, selecting the water flow rate, selecting the water resistance and selecting the cost.

[0076] According to a third aspect of the present invention, an air conditioner is provided, comprising a heat exchanger. When selecting the heat exchanger, the above-mentioned method for selecting the heat exchanger of an air conditioner is adopted.

[0077] The above-mentioned one or more technical solutions in the present invention have at least one of the following technical effects: the present invention provides a heat exchanger selection method, device and air conditioner for an air conditioner, which uses the target heat exchanger cost and target total heat transfer coefficient of the heat exchanger as target values, and combines a computer to simulate and calculate the heat exchanger scheme, so that the balance and cost selection of the heat exchanger are optimized, and different heat exchanger design schemes are uniformly compared, thereby improving the efficiency of heat exchanger selection and design. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0079] Figure 1 1 is a flow chart of a method for selecting a heat exchanger for an air conditioner provided by the present invention;

[0080] Figure 2 It is a structural schematic diagram of the heat exchanger selection device for the air conditioner provided by the present invention.

[0081] Reference numerals:

[0082] 10. Parameter acquisition module; 20. Threshold determination module; 30. Strategy generation module. DETAILED DESCRIPTION

[0083] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0084] The present invention is described in detail below with reference to the accompanying drawings. The specific operating methods in the method embodiments can also be applied to device embodiments or system embodiments. In the description of the present invention, unless otherwise specified, "at least one" includes one or more. "Multiple" refers to two or more. For example, at least one of A, B, and C includes: A exists alone, B exists alone, A and B exist at the same time, A and C exist at the same time, B and C exist at the same time, and A, B, and C exist at the same time. In the present invention, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0085] The present invention will be described in detail below with reference to specific embodiments.

[0086] The present invention provides a target total heat transfer coefficient and target heat exchanger cost for a given heat exchanger, combines target design parameters, and adopts a protection algorithm to approximate the solution. Through calculation, the heat exchanger selection is automated while ensuring a balance between heat exchanger performance and cost.

[0087] In one application scenario, given a target heat exchanger cost P0 and a target total heat transfer coefficient h0, a conservation algorithm is used to approximate the solution. When calculating the target total heat transfer coefficient h0, the number of heat exchange tubes N is used as the independent variable of the function, and the difference between the actual total heat transfer coefficient of the heat exchanger and the target total heat transfer coefficient is used as the dependent variable. The results are Δh1 = f(N1) and Δh2 = f(N2). The accuracy is ξ = 2.

[0088] Step S100: Before performing comparative analysis and calculation, the following design parameters must be specified: nominal cooling capacity Q0, nominal power W0, heat exchanger inlet water temperature Tino, heat exchanger outlet water temperature Tout, water side flow number PASS, heat exchanger water flow rate range [v1, v2], heat exchanger model, heat exchanger length L, heat exchanger inner diameter di, heat exchanger price per meter UP, target cost price P0. Then, the heat exchanger number range [N1, N2] is calculated according to the following formula.

[0089] It should be noted that when calculating water flow, different calculation formulas are selected according to the adopted standards:

[0090] When the calculation method is American Standard (AHRI 551 591):

[0091] N1=(Q0×0.86 / (Tino-Tout)) / (3.14×(di / 1000)^2 / 4 / PASS×3600×v1);

[0092] N2=(Q0×0.86 / (Tino-Tout)) / (3.14×(di / 1000)^2 / 4 / PASS×3600×v2);

[0093] When the calculation method is the national standard (GB / T 18430.1):

[0094] N1=(Q0×0.172) / (3.14×(di / 1000)^2 / 4 / PASS×3600×v1);

[0095] N2=(Q0×0.215) / (3.14×(di / 1000)^2 / 4 / PASS×3600×v2);

[0096] Step S200, N0 = P0 / (UP×L), if N0 is not an integer, then round it up according to the rounding method to get the approximate number of heat exchange tubes N0' = Round(N0), (the following tube numbers are rounded up and will not be repeated) If the design calculation cannot meet the target price, the process returns to step S100 and resets the design parameters. If N0′∈[N1, N2], the following steps are performed.

[0097] In step S300, N3 is taken as N2-f(N2)(N2-N1) / [f(N2)-f(N1)], where f is a function of the total heat transfer coefficient calculation formula of the heat exchanger, and the heat exchange device simulation calculation system is calculated under full load.

[0098] Step S310: If Set N1'=2×N1, N2'=2×N2 and return to step S300;

[0099] In step S320, if N3∈[N1, N2], N1, N2, and N3 are substituted into the total heat transfer coefficient calculation formula of the heat exchanger to obtain the total heat transfer coefficients h1, h2, and h3 corresponding to the three different numbers of heat exchangers, and the following judgment is performed:

[0100] △h1=h1-h0;

[0101] △h2=h2-h0;

[0102] △h3=h3-h0;

[0103] In step S400 , if Δh1*Δh2=0, the calculation is terminated and the following judgment is performed.

[0104] Step S410: If Δh1 = 0, perform the following judgment:

[0105] Step S411: If N1 ≤ N0', then take N1 as the target number of heat exchangers and output the corresponding heat transfer calculation results: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0106] Step S412: If N1>N0', then (N1+N0') / 2 is used as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0107] Step S420: If Δh1≠0, perform the following judgment:

[0108] Step S421: If N2 ≤ N0', then take N2 as the target number of heat exchangers and output the corresponding heat transfer calculation results: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0109] Step S422: If N2 > N0', then (N2 + N0') / 2 is used as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0110] In step S500 , if Δh1*Δh2<0, the following judgment is performed; otherwise, step S600 is performed.

[0111] In step S510, if Δh3=0, the calculation ends and the following judgment is performed:

[0112] Step S511: If N3 ≤ N0', then take N3 as the target number of heat exchangers and output the corresponding heat transfer calculation results: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0113] Step S512: If N3 > N0', then (N3 + N0') / 2 is used as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0114] Step S520: If Δh1*Δh3<0, set N2=N3;

[0115] Step S521: If |N1–N2|≤2, then the calculation ends and the minimum value of N1 and N2 is taken to perform the following judgment:

[0116] Step S522: If Min(N1, N2) ≤ N0', then Min(N1, N2) is taken as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0117] Step S523: If Min(N1, N2)>N0', then [Min(N1, N2)+N0'] / 2 is used as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0118] Step S524: If |N1-N2|>2, return to step S300.

[0119] Step S530: If Δh1*ΔTh3>0, set N1=N3;

[0120] Step S531: If |N1–N2|≤2, then the calculation is terminated, and the minimum value of N1 and N2 is taken to perform the following judgment:

[0121] Step S532: If Min(N1, N2) ≤ N0', then Min(N1, N2) is taken as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0122] Step S533: If Min(N1, N2)>N0', then [Min(N1, N2)+N0'] / 2 is used as the target number of heat exchangers, and the corresponding heat transfer calculation results are output: the total heat transfer coefficient of the heat exchanger, the selected water flow rate, the selected water resistance, and the selected cost;

[0123] Step S534: If |N1-N2|>2, return to step S300.

[0124] Step S600: If Δh1*Δh2>0, perform the following judgment:

[0125] Step S610: If Δh1>0, set N2'=2×N2, and then return to step S300;

[0126] In step S620 , if Δh1<0, set N1′=N1 / 2, and then return to step S300 .

[0127] In another application scenario, a conservation algorithm is used to approximate a given target total heat transfer coefficient and target heat exchanger cost. Specifically, for a continuous function y = f(x) on the interval [a, b] with f(a)·f(b) < 0, the function f(x) converges rapidly by continuously reducing the interval containing its zero point. If, after a certain number of iterations, the interval length is reduced to a small extent, the interval length is further reduced so that the two endpoints gradually approach zero, thereby obtaining an approximate zero value.

[0128] Given the accuracy ξ, the steps for finding the approximate zero value of the function f(x) using the protection algorithm are as follows:

[0129] Step S10, determine the interval [a, b], verify f(a)·f(b)<0, and give the accuracy ξ.

[0130] Step S20, find the zero point c of the interval [a, b].

[0131] Step S30, calculating f(c).

[0132] Step S31, let c = bf(b)(ba) / [f(b)-f(a)];

[0133] Step S32: If Set a'=2a, b'=2b and return to step S10;

[0134] Step S33: If c∈[a,b], perform the following judgment:

[0135] Step S34, if f(c)=0, then point c is the zero point;

[0136] Step S35: If f(c)≠0, perform the following judgment:

[0137] Step S36, f(a)·f(c)<0, set b=c and return to step S10;

[0138] Step S37, f(b)·f(c)<0, set a=c and return to step S10;

[0139] Step S40 , determining whether the accuracy ξ is achieved: that is, if |ab|<ξ, then the zero-point approximation a or b is obtained, otherwise, steps S10 to S40 are repeated.

[0140] In some specific embodiments of the present invention, Figure 1 As shown, this solution provides a method for selecting a heat exchanger for an air conditioner, including:

[0141] Based on the selection operation instructions, the target total heat transfer coefficient, target heat exchanger cost and target design parameters of the heat exchanger are obtained;

[0142] Determining a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficient corresponding to the threshold range of the number of heat exchange tubes based on the target heat exchanger cost and the target design parameters;

[0143] Based on the heat transfer coefficient threshold range and the target total heat transfer coefficient, a selection strategy for the heat exchanger is determined. The selection strategy at least includes selecting the total heat transfer coefficient, selecting the water flow rate, selecting the water resistance, and selecting the cost.

[0144] In some possible implementations of the present invention, the step of determining a threshold range of the number of heat exchange tubes of the heat exchanger specifically includes:

[0145] Determine the total number of heat exchange tubes in the heat exchanger based on the interval range corresponding to the target design parameters;

[0146] A heat exchange tube quantity threshold range is determined based on the number of heat exchange tubes corresponding to each heat exchange tube quantity sample.

[0147] Specifically, this embodiment provides an implementation method for determining the threshold range of the number of heat exchange tubes of a heat exchanger. By inputting the target design parameters of the heat exchanger, a sample of the total number of heat exchange tubes of the heat exchanger is obtained, and then the threshold range of the number of heat exchange tubes of the heat exchanger is determined.

[0148] In a possible embodiment, samples of the number of heat exchange tubes of multiple heat exchangers are determined by inputting target design parameters, and a sample set is formed based on the samples of the number of heat exchange tubes of all heat exchangers, wherein the sample set includes the maximum and minimum values ​​of the number of heat exchange tubes of the heat exchangers.

[0149] In some possible embodiments of the present invention, the target design parameters include at least nominal cooling capacity, heat exchanger inlet water temperature, heat exchanger outlet water temperature, water side flow number, heat exchanger water flow rate range and heat exchange tube inner diameter.

[0150] Specifically, this embodiment provides an implementation method for target design parameters, which realizes automatic selection of heat exchange tubes by inputting the target design parameters in advance and combining the target total heat transfer coefficient and the target heat exchanger cost.

[0151] In some possible implementations of the present invention, the step of determining a threshold range of the number of heat exchange tubes of the heat exchanger further includes:

[0152] Based on the target design parameters, the heat exchange tube length and heat exchange tube unit price of the heat exchanger are obtained, where the heat exchange tube unit price is the price of the heat exchange tube per unit of measurement;

[0153] Determine the target number of heat exchange tubes for the heat exchanger based on the target heat exchanger cost, heat exchange tube length, and heat exchange tube unit price;

[0154] When the target number of heat exchange tubes satisfies a heat exchange tube number threshold range, a heat transfer coefficient threshold range corresponding to the heat exchange tube number threshold range is obtained;

[0155] When the target number of heat exchange tubes does not meet the heat exchange tube number threshold range, an instruction is generated to prompt resetting of the target design parameters.

[0156] Specifically, this embodiment provides an implementation method for determining a threshold range for the number of heat exchange tubes of a heat exchanger. The target number of heat exchange tubes is calculated using the target design parameters and the target heat exchanger cost, and a judgment is made based on the target number of heat exchange tubes and the threshold range for the number of heat exchange tubes. When the target number of heat exchange tubes is not within the threshold range for the number of heat exchange tubes, it indicates that the input values ​​of the target design parameters are not reasonable. Therefore, the target design parameters need to be re-entered, so that the target number of heat exchange tubes that meets the threshold range for the number of heat exchange tubes can be obtained under the premise of the target total heat transfer coefficient and the target heat exchanger cost.

[0157] In some possible implementations of the present invention, the step of determining a threshold range of the number of heat exchange tubes of the heat exchanger further includes:

[0158] Based on the heat exchange tube quantity threshold range, obtaining a first heat exchange tube quantity characteristic value and a second heat exchange tube quantity characteristic value of the heat exchange tube, wherein the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value are values ​​at both ends of the heat exchange tube quantity threshold range;

[0159] Determine a first heat exchanger heat transfer coefficient and a second heat exchanger heat transfer coefficient based on the first heat exchange tube number characteristic value, the second heat exchange tube number characteristic value, and the total heat transfer coefficient function of the heat exchanger, where the first heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the first heat exchange tube number characteristic value, and the second heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the second heat exchange tube number characteristic value;

[0160] A heat transfer coefficient threshold range is determined based on the first heat exchanger heat transfer coefficient, the second heat exchanger heat transfer coefficient, and the target total heat transfer coefficient.

[0161] Specifically, this embodiment provides an implementation method for determining a threshold range for the number of heat exchange tubes of a heat exchanger, obtaining a first heat exchange tube number characteristic value and a second heat exchange tube number characteristic value of the heat exchange tube through the threshold range for the number of heat exchange tubes, and then, based on a protection algorithm, performing a performance and cost balance calculation for the heat exchanger with a target total heat transfer coefficient and a target heat exchanger cost as targets.

[0162] In some possible implementations of the present invention, the step of determining the heat transfer coefficient threshold range specifically includes:

[0163] determining a first heat transfer coefficient variable factor based on the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient, wherein the first heat transfer coefficient variable factor is a difference between the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient;

[0164] determining a second heat transfer coefficient variable factor based on the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient, where the second heat transfer coefficient variable factor is a difference between the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient;

[0165] A heat transfer coefficient threshold range is determined based on the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor.

[0166] Specifically, this embodiment provides an implementation method for determining the threshold range of the heat transfer coefficient. By obtaining the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor, the threshold range of the heat transfer coefficient is determined, which provides a guarantee for the performance and cost balance of the heat exchanger selection.

[0167] In some possible embodiments of the present invention, the step of determining a heat exchanger selection strategy based on a heat transfer coefficient threshold range and a target total heat transfer coefficient specifically includes:

[0168] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero, and the first heat transfer coefficient variable factor is equal to zero, generating a selection strategy according to the first heat exchange tube quantity characteristic value;

[0169] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero, and the first heat transfer coefficient variable factor is not equal to zero, a selection strategy is generated according to the second heat exchange tube quantity characteristic value.

[0170] Specifically, this embodiment provides an implementation method for determining the selection strategy of a heat exchanger. By combining the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor, as well as the first heat transfer coefficient variable factor itself, it is determined whether the selection strategy is generated based on the first heat exchange tube number characteristic value or the second heat exchange tube number characteristic value.

[0171] In some possible implementations of the present invention, the step of generating a selection strategy based on the characteristic value of the number of first heat exchange tubes specifically includes:

[0172] Based on the first heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the first heat exchange tube quantity characteristic value, and generating a selection strategy according to the updated target heat exchange tube quantity;

[0173] Based on the fact that the first heat exchange tube quantity characteristic value is greater than the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to half the sum of the first heat exchange tube quantity characteristic value and the target heat exchange tube quantity, and a selection strategy is generated according to the updated target heat exchange tube quantity.

[0174] Specifically, this embodiment provides an implementation method for generating a selection strategy based on the characteristic value of the first number of heat exchange tubes. Based on the quantitative comparison relationship between the characteristic value of the first number of heat exchange tubes and the target number of heat exchange tubes, it is determined whether to update the target number of heat exchange tubes, and then the selection strategy is determined based on the target number of heat exchange tubes.

[0175] In some possible implementations of the present invention, the step of generating a selection strategy based on the characteristic value of the number of second heat exchange tubes specifically includes:

[0176] Based on the second heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the second heat exchange tube quantity characteristic value, and generating a selection strategy according to the updated target heat exchange tube quantity;

[0177] Based on the fact that the characteristic value of the second number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the characteristic value of the second number of heat exchange tubes and the target number of heat exchange tubes, and a selection strategy is generated according to the updated target number of heat exchange tubes.

[0178] Specifically, this embodiment provides an implementation method for generating a selection strategy based on the characteristic value of the second number of heat exchange tubes. Based on the quantitative comparison relationship between the characteristic value of the second number of heat exchange tubes and the target number of heat exchange tubes, it is determined whether to update the target number of heat exchange tubes, and then the selection strategy is determined based on the target number of heat exchange tubes.

[0179] In some possible embodiments of the present invention, the step of determining a heat exchanger selection strategy based on a heat transfer coefficient threshold range and a target total heat transfer coefficient specifically includes:

[0180] Based on the heat exchange tube quantity threshold range, obtaining a third heat exchange tube quantity characteristic value of the heat exchange tube, where the third heat exchange tube quantity characteristic value is between the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value;

[0181] Determine a third heat exchanger heat transfer coefficient based on the third heat exchange tube quantity characteristic value and the total heat transfer coefficient function of the heat exchanger, where the third heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the third heat exchange tube quantity characteristic value;

[0182] Based on the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient, a third heat transfer coefficient variable factor is determined, where the third heat transfer coefficient variable factor is a difference between the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient.

[0183] Specifically, this embodiment provides an implementation method for determining a selection strategy for a heat exchanger. By obtaining a third characteristic value of the number of heat exchange tubes between the first characteristic value of the number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes, the third heat transfer coefficient variable factor is obtained, providing further guarantees for the performance and cost balance of heat exchanger selection.

[0184] In some possible embodiments of the present invention, the step of determining a heat exchanger selection strategy based on a heat transfer coefficient threshold range and a target total heat transfer coefficient specifically includes:

[0185] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the third heat transfer coefficient variable factor is equal to zero, generating a selection strategy according to the third heat exchange tube quantity characteristic value;

[0186] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is less than zero, generating a selection strategy according to the first heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value;

[0187] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is greater than zero, a selection strategy is generated according to the second heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value.

[0188] Specifically, this embodiment provides an implementation method for determining the selection strategy of a heat exchanger. According to the correspondence between the first heat transfer coefficient variable factor, the second heat transfer coefficient variable factor, and the third heat transfer coefficient variable factor, the specific generation form of the selection strategy is determined, thereby realizing the determination of parameters such as the total heat transfer coefficient, the selected water flow rate, the selected water resistance, and the selection cost of the heat exchanger based on the target design parameters.

[0189] In some possible implementations of the present invention, the step of generating a selection strategy based on the third heat exchange tube quantity characteristic value specifically includes:

[0190] Based on the third heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the third heat exchange tube quantity characteristic value, and generating a selection strategy according to the updated target heat exchange tube quantity;

[0191] Based on the fact that the third heat exchange tube quantity characteristic value is greater than the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to half the sum of the third heat exchange tube quantity characteristic value and the target heat exchange tube quantity, and a selection strategy is generated according to the updated target heat exchange tube quantity.

[0192] Specifically, this embodiment provides an implementation method for generating a selection strategy based on the third heat exchange tube number characteristic value. When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the third heat transfer coefficient variable factor is equal to zero, the quantitative comparison relationship between the third heat exchange tube number characteristic value and the target heat exchange tube number is used to determine whether to update the target heat exchange tube number, and then determine the selection strategy based on the target heat exchange tube number.

[0193] In some possible implementations of the present invention, the step of generating a selection strategy based on the first heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value specifically includes:

[0194] Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being less than zero, updating the third heat exchange tube quantity characteristic value according to the second heat exchange tube quantity characteristic value;

[0195] When the absolute value of the difference between the first heat exchange tube quantity characteristic value and the updated third heat exchange tube quantity characteristic value is less than or equal to 2, based on the first heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to the first heat exchange tube quantity characteristic value, and a selection strategy is generated according to the updated target heat exchange tube quantity;

[0196] When the absolute value of the difference between the first heat exchange tube quantity characteristic value and the updated third heat exchange tube quantity characteristic value is less than or equal to 2, based on the fact that the first heat exchange tube quantity characteristic value is greater than the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to half the sum of the first heat exchange tube quantity characteristic value and the target heat exchange tube quantity, and a selection strategy is generated based on the updated target heat exchange tube quantity;

[0197] When the absolute value of the difference between the first heat exchange tube quantity characteristic value and the updated third heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

[0198] Specifically, this embodiment provides an implementation method for generating a selection strategy based on the characteristic value of the first number of heat exchange tubes and the characteristic value of the third number of heat exchange tubes. When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is less than zero, the quantitative comparison relationship between the characteristic value of the first number of heat exchange tubes and the target number of heat exchange tubes is used to determine whether to update the target number of heat exchange tubes, and then determine the selection strategy based on the target number of heat exchange tubes.

[0199] In some possible implementations of the present invention, the step of generating a selection strategy based on the characteristic value of the number of the second heat exchange tubes and the characteristic value of the number of the third heat exchange tubes specifically includes:

[0200] Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being greater than zero, updating the third heat exchange tube quantity characteristic value according to the first heat exchange tube quantity characteristic value;

[0201] When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the updated characteristic value of the third number of heat exchange tubes is less than or equal to the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to the updated characteristic value of the third number of heat exchange tubes, and a selection strategy is generated according to the updated target number of heat exchange tubes;

[0202] When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the updated characteristic value of the third number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the updated characteristic value of the third number of heat exchange tubes and the target number of heat exchange tubes, and a selection strategy is generated according to the updated target number of heat exchange tubes;

[0203] When the absolute value of the difference between the updated third heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

[0204] Specifically, this embodiment provides an implementation method for generating a selection strategy based on the characteristic value of the second number of heat exchange tubes and the characteristic value of the third number of heat exchange tubes. When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is greater than zero, the quantitative comparison relationship between the updated characteristic value of the third number of heat exchange tubes and the target number of heat exchange tubes is used to determine whether to update the target number of heat exchange tubes, and then the selection strategy is determined based on the target number of heat exchange tubes.

[0205] In some possible embodiments of the present invention, the step of determining a heat exchanger selection strategy based on a heat transfer coefficient threshold range and a target total heat transfer coefficient specifically includes:

[0206] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is greater than zero, the third heat transfer tube number characteristic value and the third heat transfer coefficient variable factor of the heat transfer tube are re-obtained based on the second heat transfer tube number characteristic value magnified N times, where N is a positive integer greater than or equal to 2;

[0207] When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is less than zero, the third heat transfer tube number characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are re-obtained based on the first heat transfer tube number characteristic value reduced by M times, where M is a positive integer greater than or equal to 2.

[0208] Specifically, this embodiment provides an implementation method for determining the selection strategy of a heat exchanger. When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, it indicates that there are no suitable heat exchanger parameters at this time, and it is necessary to re-obtain the third heat exchange tube number characteristic value and the third heat transfer coefficient variable factor.

[0209] In some specific embodiments of the present invention, Figure 2 As shown, this solution provides a heat exchanger selection device for an air conditioner, comprising:

[0210] The parameter acquisition module 10 is used to obtain the target total heat transfer coefficient, target heat exchanger cost and target design parameters of the heat exchanger based on the selection operation instruction;

[0211] A threshold determination module 20 is configured to determine a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficient corresponding to the threshold range of the number of heat exchange tubes based on a target heat exchanger cost and target design parameters;

[0212] The strategy generation module 30 is used to determine the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient. The selection strategy at least includes the selection of total heat transfer coefficient, selection of water flow rate, selection of water resistance and selection cost.

[0213] In some specific embodiments of the present invention, an air conditioner is provided, including a heat exchanger. When selecting the heat exchanger, the above-mentioned method for selecting the heat exchanger of the air conditioner is adopted.

[0214] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. That is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0215] 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 the necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing 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, a magnetic disk, an optical disk, etc., and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or certain parts of the embodiment.

[0216] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for selecting a heat exchanger for an air conditioner, characterized in that: include: Based on the selection operation instruction, obtaining a target total heat transfer coefficient, a target heat exchanger cost, and target design parameters of the heat exchanger; Determining, based on the target heat exchanger cost and the target design parameters, a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficients corresponding to the threshold range of the number of heat exchange tubes; Based on the heat transfer coefficient threshold range and the target total heat transfer coefficient, a selection strategy for the heat exchanger is determined, wherein the selection strategy at least includes selecting the total heat transfer coefficient, selecting the water flow rate, selecting the water resistance, and selecting the cost.

2. The heat exchanger selection method for an air conditioner according to claim 1, characterized in that: The step of determining the threshold range of the number of heat exchange tubes of the heat exchanger specifically includes: Determining a sample of the number of all heat exchange tubes of the heat exchanger according to an interval range corresponding to the target design parameter; The heat exchange tube quantity threshold range is determined based on the number of heat exchange tubes corresponding to each heat exchange tube quantity sample.

3. The method for selecting a heat exchanger for an air conditioner according to claim 2, wherein: The target design parameters include at least nominal cooling capacity, heat exchanger inlet water temperature, heat exchanger outlet water temperature, water side flow number, heat exchanger water flow rate range and heat exchange tube inner diameter.

4. The method for selecting a heat exchanger for an air conditioner according to claim 2, wherein: The step of determining the threshold range of the number of heat exchange tubes of the heat exchanger specifically further includes: Based on the target design parameters, obtaining a heat exchange tube length and a heat exchange tube unit price of the heat exchanger, wherein the heat exchange tube unit price is a price of the heat exchange tube per unit of measurement; determining a target number of heat exchange tubes of the heat exchanger based on the target heat exchanger cost, the heat exchange tube length, and the heat exchange tube unit price; When the target number of heat exchange tubes satisfies the heat exchange tube number threshold range, obtaining a heat transfer coefficient threshold range corresponding to the heat exchange tube number threshold range; When the target number of heat exchange tubes does not satisfy the threshold range of the number of heat exchange tubes, an instruction is generated to prompt resetting of the target design parameters.

5. The method for selecting a heat exchanger for an air conditioner according to claim 2, wherein: The step of determining the threshold range of the number of heat exchange tubes of the heat exchanger specifically further includes: Based on the heat exchange tube quantity threshold range, obtaining a first heat exchange tube quantity characteristic value and a second heat exchange tube quantity characteristic value of the heat exchange tube, wherein the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value are values ​​at both ends of the heat exchange tube quantity threshold range; Determining the first heat exchanger heat transfer coefficient and the second heat exchanger heat transfer coefficient based on the first heat exchange tube number characteristic value, the second heat exchange tube number characteristic value, and the total heat transfer coefficient function of the heat exchanger, where the first heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the first heat exchange tube number characteristic value, and the second heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the second heat exchange tube number characteristic value; The heat transfer coefficient threshold range is determined based on the first heat exchanger heat transfer coefficient, the second heat exchanger heat transfer coefficient, and the target total heat transfer coefficient.

6. The method for selecting a heat exchanger for an air conditioner according to claim 5, wherein: The step of determining the heat transfer coefficient threshold range specifically includes: determining a first heat transfer coefficient variable factor based on the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient, wherein the first heat transfer coefficient variable factor is a difference between the first heat exchanger heat transfer coefficient and the target total heat transfer coefficient; determining a second heat transfer coefficient variable factor based on the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient, wherein the second heat transfer coefficient variable factor is a difference between the second heat exchanger heat transfer coefficient and the target total heat transfer coefficient; The heat transfer coefficient threshold range is determined based on the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor.

7. The method for selecting a heat exchanger for an air conditioner according to claim 6, wherein: The step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes: generating the selection strategy according to the first heat exchange tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero and the first heat transfer coefficient variable factor is equal to zero; When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is equal to zero, and the first heat transfer coefficient variable factor is not equal to zero, the selection strategy is generated according to the second heat exchange tube quantity characteristic value.

8. The method for selecting a heat exchanger for an air conditioner according to claim 7, wherein: The step of generating the selection strategy according to the first heat exchange tube quantity characteristic value specifically includes: Based on the first heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the first heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity; Based on the fact that the first characteristic value of the number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the first characteristic value of the number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes.

9. The method for selecting a heat exchanger for an air conditioner according to claim 7, wherein: The step of generating the selection strategy according to the second heat exchange tube quantity characteristic value specifically includes: Based on the second heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the second heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity; Based on the second heat exchange tube number characteristic value being greater than the target heat exchange tube number, the target heat exchange tube number is updated according to half the sum of the second heat exchange tube number characteristic value and the target heat exchange tube number, and the selection strategy is generated according to the updated target heat exchange tube number.

10. The method for selecting a heat exchanger for an air conditioner according to any one of claims 6 to 9, characterized in that: The step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes: Based on the heat exchange tube quantity threshold range, obtaining a third heat exchange tube quantity characteristic value of the heat exchange tube, wherein the third heat exchange tube quantity characteristic value is between the first heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value; determining a third heat exchanger heat transfer coefficient based on the third heat exchange tube quantity characteristic value and the total heat transfer coefficient function of the heat exchanger, wherein the third heat exchanger heat transfer coefficient is the heat exchanger heat transfer coefficient corresponding to the third heat exchange tube quantity characteristic value; Based on the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient, a third heat transfer coefficient variable factor is determined, where the third heat transfer coefficient variable factor is a difference between the third heat exchanger heat transfer coefficient and the target total heat transfer coefficient.

11. The method for selecting a heat exchanger for an air conditioner according to claim 10, wherein: The step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes: generating the selection strategy according to the third heat exchange tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero and the third heat transfer coefficient variable factor is equal to zero; generating the selection strategy according to the first heat transfer tube quantity characteristic value and the third heat transfer tube quantity characteristic value when the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is less than zero; When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is less than zero, and the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor is greater than zero, the selection strategy is generated according to the second heat exchange tube number characteristic value and the third heat exchange tube number characteristic value.

12. The method for selecting a heat exchanger for an air conditioner according to claim 11, wherein: The step of generating the selection strategy according to the third heat exchange tube quantity characteristic value specifically includes: Based on the third heat exchange tube quantity characteristic value being less than or equal to the target heat exchange tube quantity, updating the target heat exchange tube quantity according to the third heat exchange tube quantity characteristic value, and generating the selection strategy according to the updated target heat exchange tube quantity; Based on the fact that the third heat exchange tube quantity characteristic value is greater than the target heat exchange tube quantity, the target heat exchange tube quantity is updated according to half the sum of the third heat exchange tube quantity characteristic value and the target heat exchange tube quantity, and the selection strategy is generated according to the updated target heat exchange tube quantity.

13. The method for selecting a heat exchanger for an air conditioner according to claim 11, wherein: The step of generating the selection strategy according to the first heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value specifically includes: Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being less than zero, updating the third heat exchange tube quantity characteristic value according to the second heat exchange tube quantity characteristic value; When the absolute value of the difference between the first characteristic value of the number of heat exchange tubes and the updated characteristic value of the third characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the first characteristic value of the number of heat exchange tubes is less than or equal to the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to the first characteristic value of the number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes; When the absolute value of the difference between the first characteristic value of the number of heat exchange tubes and the updated characteristic value of the third characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the first characteristic value of the number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the first characteristic value of the number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes; When the absolute value of the difference between the first heat exchange tube quantity characteristic value and the updated third heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

14. The method for selecting a heat exchanger for an air conditioner according to claim 11, wherein: The step of generating the selection strategy according to the second heat exchange tube quantity characteristic value and the third heat exchange tube quantity characteristic value specifically includes: Based on the product of the first heat transfer coefficient variable factor and the third heat transfer coefficient variable factor being greater than zero, updating the third heat exchange tube quantity characteristic value according to the first heat exchange tube quantity characteristic value; When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the updated characteristic value of the third number of heat exchange tubes being less than or equal to the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to the updated characteristic value of the third number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes; When the absolute value of the difference between the updated characteristic value of the third number of heat exchange tubes and the second characteristic value of the number of heat exchange tubes is less than or equal to 2, based on the fact that the updated characteristic value of the third number of heat exchange tubes is greater than the target number of heat exchange tubes, the target number of heat exchange tubes is updated according to half the sum of the updated characteristic value of the third number of heat exchange tubes and the target number of heat exchange tubes, and the selection strategy is generated according to the updated target number of heat exchange tubes; When the absolute value of the difference between the updated third heat exchange tube quantity characteristic value and the second heat exchange tube quantity characteristic value is greater than 2, the third heat exchange tube quantity characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are obtained again based on the heat exchange tube quantity threshold range.

15. The method for selecting a heat exchanger for an air conditioner according to claim 10, wherein: The step of determining the selection strategy of the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient specifically includes: When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is greater than zero, a third heat transfer tube quantity characteristic value and the third heat transfer coefficient variable factor are re-obtained based on the second heat transfer tube quantity characteristic value magnified N times, where N is a positive integer greater than or equal to 2; When the product of the first heat transfer coefficient variable factor and the second heat transfer coefficient variable factor is greater than zero, and the first heat transfer coefficient variable factor is less than zero, the third heat transfer tube number characteristic value and the third heat transfer coefficient variable factor of the heat exchange tube are re-obtained based on the first heat transfer tube number characteristic value reduced by M times, where M is a positive integer greater than or equal to 2.

16. A heat exchanger selection device for an air conditioner, characterized in that: include: A parameter acquisition module (10) is used to acquire a target total heat transfer coefficient, a target heat exchanger cost and a target design parameter of the heat exchanger based on the selection operation instruction; A threshold determination module (20) is used to determine a threshold range of the number of heat exchange tubes of the heat exchanger and a threshold range of heat transfer coefficient corresponding to the threshold range of the number of heat exchange tubes based on the target heat exchanger cost and the target design parameter; A strategy generation module (30) is used to determine a selection strategy for the heat exchanger based on the heat transfer coefficient threshold range and the target total heat transfer coefficient, wherein the selection strategy at least includes a selection total heat transfer coefficient, a selection water flow rate, a selection water resistance, and a selection cost.

17. An air conditioner, characterized in that: The heat exchanger is included, and when selecting the heat exchanger, the heat exchanger selection method of the air conditioner according to any one of claims 1 to 15 is adopted.

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