A heat transfer simulation method, device and medium for electric heating clothing

Abstract

The present invention relates to a method, device and medium for simulating heat transfer of an electric heating garment. The method includes: establishing an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model for the electric heating garment; establishing a combined application method for the two models; conducting a verification experiment on the combined application method of the two models to obtain an electric heating clothing heat transfer model, an electric heating fabric system heat transfer model, and a combined application method that pass the verification experiment; based on the two models that pass the verification experiment and the combined application method, establishing a temperature prediction model for guiding the temperature setting of the heating part of the electric heating clothing heat transfer model; or, changing the parameters of the heating sheet in the electric heating clothing heat transfer model that passes the verification experiment to conduct a simulation experiment, and establishing a skin temperature prediction model for guiding the design of the electric heating garment. The present invention constructs a combined application method of an electric heating fabric system model and an electric heating clothing wearing model, making the simulation results of the electric heating garment more realistic.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent clothing design, and in particular to a method, device and medium for simulating heat transfer of an electric heating garment. Background Art

[0002] Electric heating garments have the advantages of fast heating speed, high heat preservation efficiency, lightness, thinness and washability, and are currently the most widely used heating and cold-proof garments. At present, for the design and performance evaluation of electric heating garments, the more common method is to conduct experiments on a thermal manikin or real people. However, the parameters that can be set in the experiment are limited, the experimental period is long, and the heat transfer mechanism cannot be further studied. At present, the mechanism of the influence of the parameter design of electric heating garments on their heat transfer performance is still not clear enough, resulting in the lack of scientific basis for the design of electric heating garments.

[0003] In recent years, the method of constructing a numerical model based on the theory of Computational Fluid Dynamics (CFD) has been introduced into the field of clothing thermal comfort research. By simulating and predicting the experimental results under certain conditions, numerical calculations and visual analysis of the experimental mechanism are carried out. On the premise of ensuring the accuracy of the model and simulation results, the experimental cost can be greatly reduced. At the same time, its flexible parameter adjustment function is convenient for carrying out systematic scientific research on influencing factors and their correlation. At present, the simulation research on clothing mainly includes two levels: fabric simulation and human body dressing simulation. Chinese patents with publication numbers CN104809269A and CN117933003A respectively simulate the fabric heat transfer process by using different modeling methods. The fabric model can accurately simulate the multi-layer combination and organizational structure of the fabric. However, due to the difference between two-dimensional fabric and three-dimensional clothing, it is impossible to simulate the heat transfer of the irregular air layer under the clothing in the real dressing situation. The dressing model can simulate the interactive heat transfer process under the real shape of the human body and clothing. However, due to the large number of grids and the high complexity of multi-physical field coupling, the simulation requires high computing power of the computer. The model often simplifies the real structure of the fabric and directly sets the heating power or heating temperature on the clothing surface. In fact, electric heating cold-proof garments are all multi-layer fabric structures, and the heating sheets are placed inside the clothing. Affected by the multi-layer fabric and air layer of the clothing, there is a certain difference between the actual temperature at which the heat of the heating sheet is transferred to the clothing surface and the heating temperature of the heating sheet. Therefore, directly setting the heating temperature on the clothing model surface does not conform to the real heat transfer situation, and it is impossible to simulate the heat transfer of the heating sheet between the multi-layer fabrics of the clothing, which affects the heat transfer experimental results. In addition, the current dressing model research is all for single-piece clothing, which does not conform to the wearing situation in cold environments.

[0004] Therefore, the prior art cannot truly reflect the complex three-dimensional heat transfer characteristics inside the electric heating garment, and thus cannot accurately design the electric heating garment. Summary of the Invention

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the heat transfer simulation method for electric heating clothing cannot truly reflect the complex three-dimensional heat transfer characteristics inside the electric heating clothing, and thus cannot accurately design the electric heating clothing.

[0006] To solve the above technical problem, the present invention provides a heat transfer simulation method for electric heating clothing, including:

[0007] Step S1: Based on fluid dynamics, establish an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model for the electric heating clothing;

[0008] Step S2: Establish a combined application method for the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model;

[0009] Step S3: Conduct a verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model to obtain an electric heating clothing heat transfer model, an electric heating fabric system heat transfer model, and a combined application method that pass the verification experiment;

[0010] Step S4: Based on the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method that pass the verification experiment, establish a temperature prediction model, and the temperature prediction model is used to guide the setting of the temperature of the heating part of the electric heating clothing heat transfer model;

[0011] Alternatively, change the parameters of the heating sheet in the electric heating clothing heat transfer model that passes the verification experiment to conduct a parametric simulation experiment, and establish a skin temperature prediction model according to the results of the parametric simulation experiment, and the skin temperature prediction model is used to guide the design of the electric heating clothing.

[0012] In an embodiment of the present invention, the electric heating clothing heat transfer model in the step S1 includes a double-layer clothing geometric model and a human body geometric model, wherein,

[0013] The human body geometric model is constructed by means of three-dimensional scanning;

[0014] The double-layer clothing geometric model includes an electric heating clothing layer and a long-sleeved underwear layer, both of which are constructed by using virtual fitting software. The electric heating clothing layer is provided with heating sheets, and the constructed human body geometric model and the double-layer clothing geometric model are imported into the simulation software to construct the electric heating clothing heat transfer model.

[0015] In an embodiment of the present invention, the heat transfer model of the electric heating fabric system in step S1 includes: an outer combined fabric, a heating sheet, a heating component fabric for surrounding the heating sheet, an inner fabric, an inner garment layer, and a skin layer. The outer combined fabric, the heating sheet, the heating component fabric for surrounding the heating sheet, and the inner fabric are combined to form an electric heating clothing combined layer, and the heating component fabric is attached to the inner fabric.

[0016] In an embodiment of the present invention, the combined application method of establishing the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model in step S2 includes:

[0017] Measuring the average air layer thickness of the heating part where the heating sheet of the electric heating clothing layer is located through the electric heating clothing heat transfer model, including measuring the average air layer thickness between the long-sleeved inner garment layer and the skin layer of the human body geometric model, and setting it as Measuring the average air layer thickness between the electric heating clothing layer and the long-sleeved inner garment layer, and setting it as ;

[0018] Taking as the average air thickness between the inner garment layer and the skin layer in the electric heating fabric system heat transfer model, and at the same time taking as the average air layer thickness between the electric heating clothing combined layer and the inner garment layer in the electric heating fabric system heat transfer model, thereby realizing the geometric modeling of the electric heating fabric system heat transfer model to simulate the real dressing state, and then obtaining the actual temperature of the heating part of the inner layer of the electric heating clothing combined layer through fabric heat transfer simulation calculation, and setting it as wherein, the inner layer of the electric heating clothing combined layer is the layer of the electric heating clothing combined layer close to the inner garment layer;

[0019] Applying the actual temperature of the heating part of the inner layer of the electric heating clothing combined layer to the setting of the boundary temperature of the heating part in the electric heating clothing heat transfer model, and obtaining the skin temperature conditions of each part of the human body geometric model through dressing simulation calculation of the human body geometric model.

[0020] In an embodiment of the present invention, the method for verifying the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model in step S3 includes:

[0021] Pasting temperature sensors at the positions corresponding to the heating sheets on the inner layer of the electric heating clothing in reality to record temperature data;

[0022] Obtaining a warm body dummy, putting long-sleeved inner wear on the inner layer of the warm body dummy, and putting the electric heating clothing in reality with the temperature sensors pasted on the outer layer of the warm body dummy, and recording the skin temperature values of each part of the human body through the warm body dummy.

[0023] The temperature data of the inner layer of the actual electric heating clothing obtained by the temperature sensor is used for the verification of the heat transfer model of the electric heating fabric system, and the skin temperature data obtained by the warm body mannequin is used for the verification of the heat transfer model of the electric heating clothing.

[0024] In one embodiment of the present invention, the method for establishing the temperature prediction model based on the heat transfer model of the electric heating clothing, the heat transfer model of the electric heating fabric system, and the combined application method in the step S4 includes:

[0025] Based on the heat transfer model of the electric heating clothing, the heat transfer model of the electric heating fabric system, and the combined application method through the verification experiment, a temperature prediction model for the heating part of the inner layer of the combined layer of the electric heating clothing when the heating sheet is heated is constructed. The formula is:

[0026] ;

[0027] Wherein, is the average air layer thickness between the underwear layer and the skin layer, is the average air layer thickness between the combined layer of the electric heating clothing and the underwear layer, is the ambient temperature, is the human body power, is the thermal resistance of the combined layer of the electric heating clothing, is the heating temperature;

[0028] The temperature prediction model for the heating part of the inner layer of the combined layer of the electric heating clothing is used to set the temperature of the heating part where the heating sheet is located in the heat transfer model of the electric heating clothing, and the skin temperature of each part of the warm body mannequin is obtained through dressing simulation to evaluate the thermal comfort of the electric heating clothing.

[0029] In one embodiment of the present invention, the parametric simulation experiment in the step S4 includes: a heating sheet heating position simulation experiment, a heating sheet size simulation experiment, and a heating sheet distribution simulation experiment combining the heating sheet heating position and the heating sheet size. Among them,

[0030] The simulation research method for the heating position of the heating sheet is: taking the midpoint of the geometric position of the heating sheet as the reference in the heat transfer model of the electric heating clothing, and moving longitudinally and transversely along the surface of the electric heating clothing layer respectively. The average skin temperature of each part of the human body when heating at each position point during the movement is obtained through simulation calculation, and the position point with the best heating effect is selected;

[0031] The size simulation experiment of the heating sheet is as follows: The shape of the heating sheet includes a rectangular heating sheet. By changing the aspect ratio and area of the rectangular heating sheet in the heat transfer model of the electric heating clothing, the average skin temperature of each part of the human body during the heating of the rectangular heating sheet with different sizes is calculated, and the size of the rectangular heating sheet with the best heating effect is selected.

[0032] The heating sheet distribution simulation experiment combining the heating position and shape of the heating sheet is as follows: The heating sheets with different heating positions and different sizes are combined for heating simulation. Through simulation calculation, the average skin temperature of each part of the human body under different combined heating methods is obtained, and the heating sheet distribution method with the best heating effect is selected.

[0033] In an embodiment of the present invention, the method for establishing the skin temperature prediction model according to the results of the parametric simulation experiment in step S4 includes:

[0034] When using the electric heating clothing to heat the human back, determine the heating position of the heating sheet on the back, the aspect ratio of the heating sheet, and the area of the heating sheet according to the results of the parametric simulation experiment, and then obtain the designed heating sheet. According to the designed heating sheet, establish the temperature fitting equation, and the formula is:

[0035] ;

[0036] Among them, is the ambient temperature, is the human body power, is the thermal resistance of the electric heating clothing combined layer, is the heating temperature, is the width of the heating sheet;

[0037] Substitute the temperature of the inner layer of the electric heating clothing layer for back heating into the heat transfer model of the electric heating clothing. Through the clothing simulation of the human body geometric model, the skin temperature of the heating part, the skin temperature of the back, the skin temperature of the upper torso, and the skin temperature of the upper body are obtained, and a set of skin temperature fitting equations for back heating is obtained. The formula is:

[0038] ;

[0039] ;

[0040] ;

[0041] ;

[0042] The temperature of the inner layer of the electric heating clothing layer that heats the back Substitute the fitting equations into the skin temperature fitting equation sets of each part of the back heating to construct a skin temperature prediction model. The formula is:

[0043] .

[0044] To solve the above technical problems, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned heat transfer simulation method of the electric heating clothing are implemented.

[0045] To solve the above technical problems, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the heat transfer simulation method of the electric heating clothing as described above are implemented.

[0046] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0047] The present invention proposes an application method that combines an electric heating fabric system model and an electric heating clothing wearing model. This method combines the advantages of the heat transfer model of the electric heating fabric system and the heat transfer model of the electric heating clothing wearing, making the simulation results of the electric heating clothing more in line with the actual heat transfer situation and making the heat transfer research more scientific and accurate;

[0048] The establishment and application of the heat transfer simulation method of the electric heating clothing of the present invention comprehensively consider the influence of environmental factors, clothing factors, human factors, and heating element factors (heating position, size, temperature) on the heat transfer performance of the electric heating clothing. Heat transfer analysis can be carried out on the numerical results and visualization images obtained by model calculation to reveal the influence mechanism of the key parameters of the electric heating clothing on the comfort of the dressed human body;

[0049] The present invention studies the heat transfer of the electric heating fabric system and the heat transfer of the electric heating clothing wearing through simulation. The application of simulation technology in electric heating clothing reduces the experimental time and design cost of the electric heating clothing. By changing the parameter settings in the prediction model, the parametric design of the electric heating clothing can be realized, making the design of the electric heating clothing more scientific and convenient, and providing guidance for actual production and application. Description of the Drawings

[0050] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention and in conjunction with the drawings.

[0051] Figure 1 It is a flowchart of the establishment and application method of the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention;

[0052] Figure 2 Schematic diagram of the heat transfer model of the electrothermal fabric system for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention;

[0053] Figure 3 Schematic diagram of the conversion of the measured average air layer between the electrothermal clothing heat transfer model and the electrothermal fabric system heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention;

[0054] Figure 4(a) is a graph of the simulated temperature - verified temperature of the electrothermal fabric system heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 38 °C;

[0055] Figure 4(b) is a graph of the simulated temperature - verified temperature of the electrothermal fabric system heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 45 °C;

[0056] Figure 4(c) is a graph of the simulated temperature - verified temperature of the electrothermal fabric system heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 50 °C;

[0057] Figure 5(a) is a graph of the simulated temperature - verified temperature of the electrothermal clothing heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 38 °C;

[0058] Figure 5(b) is a graph of the simulated temperature - verified temperature of the electrothermal clothing heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 45 °C;

[0059] Figure 5(c) is a graph of the simulated temperature - verified temperature of the electrothermal clothing heat transfer model for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 50 °C;

[0060] Figure 6(a) is a schematic diagram of the longitudinal displacement of the heating sheet on the back for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention;

[0061] Figure 6(b) is a schematic diagram of the transverse displacement of the heating sheet on the back for the electrothermal clothing heat transfer simulation method in an example of the embodiment of the present invention;

[0062] Figure 7 Graph of temperature - back position height for the electrothermal clothing heat transfer simulation method in the embodiment of the present invention;

[0063] Figure 8This is a line graph of the upper body temperature and back temperature of heating sheets with different aspect ratios in an embodiment of the heat transfer simulation method for an electric heating garment in an embodiment of the present invention;

[0064] Figure 9 This is a cloud map of the human back surface temperature of heating sheets with different aspect ratios in an embodiment of the heat transfer simulation method for an electric heating garment in an embodiment of the present invention. Detailed implementation manners

[0065] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the exemplified embodiments are not intended to limit the present invention. Embodiment 1

[0066] The present invention relates to a heat transfer simulation method for an electric heating garment, including:

[0067] Step S1: Based on fluid dynamics, establish an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model for the electric heating garment;

[0068] Step S2: Establish a combined application method for the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model;

[0069] Step S3: Conduct a verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model to obtain an electric heating clothing heat transfer model, an electric heating fabric system heat transfer model, and a combined application method that pass the verification experiment;

[0070] Step S4: Based on the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method that pass the verification experiment, establish a temperature prediction model, and the temperature prediction model is used to guide the setting of the temperature of the heating part of the electric heating clothing heat transfer model;

[0071] Alternatively, change the parameters of the heating sheet in the electric heating clothing heat transfer model that passes the verification experiment to conduct a parametric simulation experiment, and establish a skin temperature prediction model according to the results of the parametric simulation experiment, and the skin temperature prediction model is used to guide the design of the electric heating garment.

[0072] The following is a detailed introduction to this embodiment:

[0073] As Figure 1 shown, Figure 1 This is a flowchart of the establishment and application method of a heat transfer simulation method for an electric heating garment provided by the present invention, and the steps include:

[0074] S1: Based on computational fluid dynamics, establish an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model through fluid mechanics simulation software.

[0075] In one embodiment, it further includes: simulating the heat transfer modes in the initial electric heating clothing heat transfer model and the initial electric heating fabric system heat transfer model through the multi-physics coupling module in the mechanical fluid simulation software; the heat transfer modes include heat conduction, heat convection, and heat radiation.

[0076] In one embodiment, the electric heating clothing heat transfer model includes a double-layer clothing geometric model and a human body geometric model. The human body geometric model is constructed by means of three-dimensional scanning, and the double-layer clothing geometric model (including the electric heating clothing layer and the long-sleeved underwear layer) is constructed by using 3D CLO virtual fitting software. Then, the human body geometric model and the double-layer clothing geometric model are imported into the COMSOL simulation software to construct the electric heating clothing heat transfer model.

[0077] In one embodiment, please refer to Figure 2 , the electric heating fabric system heat transfer model includes a plurality of fabric geometric models. The simulation of the plurality of fabric geometric models is simplified in the simulation software by means of vertically flat cuboids parallel to each other. The plurality of fabric geometric models include an outer layer composite fabric, a heating sheet, a heating component fabric for surrounding the heating sheet (including two layers of fabric exactly surrounding the heating sheet), an inner layer fabric, an underwear layer, a skin layer, and air layers between fabrics (including the air layer between the underwear layer and the skin layer, and the air layer between the electric heating clothing composite layer and the underwear layer).

[0078] Exemplarily, an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model are established through computational fluid dynamics simulation software, and material parameters, physical fields, boundary conditions, etc. therein are set.

[0079] Specifically, import the scanned human body geometric model into the 3D CLO virtual fitting software, and perform corresponding pattern making and sewing in the software according to the pattern sizes of the existing long-sleeved underwear (corresponding to the above-mentioned long-sleeved underwear layer, size 170 / 95) and the electric heating clothing (corresponding to the above-mentioned electric heating clothing layer, size 170 / 120). Since there are two pieces of clothing (the electric heating clothing layer (belonging to the outerwear) and the long-sleeved underwear layer (belonging to the underwear)), first sew and try on the long-sleeved underwear layer, and after adjusting the clothing on the model, set it to be solidified. Then sew and try on the electric heating clothing layer, and refer to the real clothing wearing pictures to adjust the positions of the hat and other parts of the clothing to make the model close to the real wearing situation. After that, import the double-layer clothing geometric model and the human body geometric model into the COMSOL software, perform processing such as positioning and segmentation, and mark out the heating positions of the heating sheets in the electric heating clothing layer. Since the heat transfer of the electric heating clothing layer (i.e., an electric heating outerwear) mainly involves the upper body of the human body, and based on the symmetry of the human body, the human body geometric model is simplified to 1 / 2 of the upper body. The clothing model is a double-layer clothing geometric model with the outerwear and the underwear worn on top of each other. The data such as the thickness and thermal conductivity of the fabric of the electric heating clothing layer and the long-sleeved underwear layer are obtained by measuring the existing clothing materials with a thickness measuring instrument and a KES-F7 thermal conductivity testing instrument. Physical field settings of the electric heating clothing heat transfer model: The turbulent flow field and the fluid heat transfer field are coupled into a non-isothermal fluid physical field, and the surface-to-surface radiation field and the fluid heat transfer field are coupled into a surface-to-surface heat transfer radiation physical field. Among them, set the heat flux of the skin layer to 58 W / m 2 Simulate the metabolic rate of a male human body sitting still. The heating sheet is simulated with a constant temperature to uniformly heat the planar surface of the electric heating film. Set the wind speed to 0.1 m / s to simulate the natural indoor wind speed. The emissivity of the skin layer to the fabric radiation is 0.95, and the emissivity of the fabric surface to the outside radiation is 0.85.

[0080] Specifically, when geometrically modeling the electric heating fabric system heat transfer model, the fabric is simplified to a flat cuboid. Since the heating sheet is an electric heating film with a thickness in the micron range, in this embodiment, it is simplified to a rectangle without thickness. Since the double-layer clothing geometric model includes the electric heating clothing layer (outerwear) and the long-sleeved underwear layer (underwear), an underwear layer is established between the combined fabric of the electric heating clothing and the skin layer in the electric heating fabric system heat transfer model. Figure 2This is a schematic diagram of the heat transfer model of the electrothermal fabric system for the electrothermal clothing heat transfer simulation method in the embodiments of the present invention, including an outer composite fabric, a heating sheet, a heating component fabric for surrounding the heating sheet, an inner fabric, an inner clothing layer, a skin layer, and an air layer between the fabrics. The outer composite fabric, the heating sheet, the heating component fabric for surrounding the heating sheet, and the inner fabric are combined to form an electrothermal clothing composite layer. The length and width of the entire electrothermal fabric system heat transfer model are set to 50 cm × 50 cm. The physical parameters of each fabric material in the electrothermal fabric system heat transfer model are measured from existing clothing materials using a thickness measuring instrument and a KES-F7 thermal conductivity testing instrument. The physical fields of the electrothermal fabric system heat transfer model select two physical fields: solid heat transfer and surface-to-surface radiation, and these two physical fields are coupled. Among them, the heat flux of the skin layer is set to 58 W / m 2 Simulate the metabolic rate of a male sitting still. The heating sheet is heated uniformly in a planar shape by simulating an electrothermal film with a constant temperature. The emissivity of the skin layer radiating to the fabric is 0.95, and the emissivity of the fabric surface radiating outward is 0.85. Different local positions of the clothing correspond to different wind speeds, making it difficult to set the initial wind speed for the local clothing of the electrothermal fabric system heat transfer model. Therefore, only natural convection is considered when setting the boundary conditions of the electrothermal fabric system heat transfer model, that is, external natural convection of a vertical wall is set on the surface of the outer composite fabric, and internal natural convection is set for the air layer between the fabrics.

[0081] S2: Establish a combined application method for an electrothermal clothing heat transfer model and an electrothermal fabric system heat transfer model: Determine the average air layer thickness of the heating part where the heating sheet of the electrothermal clothing layer is located through the electrothermal clothing heat transfer model, and use the average air layer thickness as a parameter to complete the geometric modeling of the electrothermal fabric system heat transfer model to simulate the real clothing state. Then, through simulation calculation of the electrothermal fabric system heat transfer model (all simulation calculations in this embodiment are implemented through COMSOL simulation software), obtain the actual temperature of the inner layer of the heating part of the inner layer of the electrothermal clothing composite layer (the inner layer of the electrothermal clothing composite layer is the layer of the electrothermal clothing layer close to the inner clothing layer). This actual temperature will be applied to the setting of the boundary conditions of the heating part in the electrothermal clothing heat transfer model.

[0082] Exemplarily, please refer to Figure 3, a combined application method of an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model is established. The specific steps include: measuring the average air layer thickness of the heating part of the electric heating clothing through the electric heating clothing heat transfer model, including measuring the average air layer thickness between the long-sleeved underwear layer and the skin layer of the human body geometric model (equivalent to the average air layer thickness between the underwear layer and the skin layer of the electric heating fabric system heat transfer model), denoted as d1 (mm); measuring the average air layer thickness between the electric heating clothing layer and the long-sleeved underwear layer (equivalent to the average air layer thickness between the electric heating clothing combination layer and the underwear layer of the electric heating fabric system heat transfer model), denoted as d2 (mm); inputting the values of d1 and d2 into the electric heating fabric system heat transfer model for geometric modeling, and then obtaining the actual temperature of the inner layer (the position where the heating sheet is located) of the electric heating clothing combination layer through fabric heat transfer simulation calculation, denoted as (°C); applying the actual temperature of the inner layer of the heating part obtained by fabric simulation to the setting of the boundary temperature of the heating part in the electric heating clothing heat transfer model, and obtaining the skin temperature conditions of each part of the human body geometric model through clothing simulation calculation of the human body geometric model.

[0083] S3: Conduct an accuracy verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model, so as to obtain the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method of the two models that pass the verification experiment.

[0084] Exemplarily, for the accuracy verification of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model, the specific steps of the verification experiment include:

[0085] Attach the MSR temperature sensor to the center position of the heating sheet corresponding to the inner layer of the electric heating clothing in reality, and record the temperature value of the heating part. Obtain a thermal manikin. The inner layer of the thermal manikin wears long-sleeved underwear, and the outer layer is the electric heating clothing with the temperature sensor pasted on it. Record the skin temperature values of each part of the human body of the thermal manikin; adjust the environmental temperature in the artificial climate chamber to be stable at 5 °C, and set the thermal manikin wearing the electric heating clothing (not heated) to a constant temperature mode with a surface temperature of 35 °C; after the surface temperature of the climate chamber and the manikin is stable, set the thermal manikin to a constant power mode of 58 W / m 2 At the same time, the electric heating clothing starts to heat. The experiment lasts for 30 minutes, and the temperature value is recorded every 1 minute. The electric heating clothing is heated at low (38 °C), medium (45 °C), and high (50 °C) gears respectively. A total of three groups of experiments are carried out, and each group of experiments is repeated three times; finally, the temperature data of the heating part of the electric heating clothing obtained by the temperature sensor is used for the verification of the electric heating fabric system heat transfer model, and the skin temperature data of the thermal manikin is used for the verification of the electric heating clothing heat transfer model.

[0086] Simulation experiment of the heat transfer model of the electric heating fabric system: First, set temperature point probes at the heating positions on the inner layer of the combined layer of the electric heating clothing (corresponding to the position of the inner fabric close to the underwear layer). The probe positions are the same as those in the verification experiment. Input the average air layer thickness d1 (26.286 mm) between the long-sleeved underwear layer and the skin layer and the average air layer thickness d2 (12.517 mm) between the electric heating clothing layer and the underwear layer measured in the electric heating clothing heat transfer model into the electric heating fabric system heat transfer model for geometric modeling. Set the model environmental temperature at 5 °C and the constant skin temperature of the skin layer at 35 °C, and simulate the steady-state solution. Then, using the previous steady-state result as the initial temperature value, set the skin layer at 58 W / m 2 Start the transient simulation solution with a constant power and a constant temperature set for the heating element. The simulation duration is 30 min and the time step is 1 min. Conduct three groups of simulations at heating temperatures of low gear (38 °C), medium gear (45 °C), and high gear (50 °C) respectively.

[0087] Compare the inner layer temperature data at the heating positions of the electric heating clothing obtained by the temperature sensor with the simulation data of the electric heating fabric system heat transfer model. Figures 4(a), 4(b), and 4(c) are the temperature-verification temperature broken line graphs of the electric heating fabric system heat transfer model in the electric heating clothing heat transfer simulation method of the embodiments of the present invention at heating temperatures of 38 °C, 45 °C, and 50 °C respectively. It can be seen that the changing trends of the simulation curves and the experimental values are very similar. Table 1 shows the comparison between the fabric experimental data and the simulation data. The relative error values for the three gears of heating are all less than 1.26%, which can prove that there is good agreement between the simulation values and the experimental values. This shows that the simulation method of measuring the air layer thickness under the clothing through the electric heating clothing heat transfer model and using it for the construction of the electric heating fabric system heat transfer model has a certain feasibility, and the actual inner layer temperature of the heated part obtained by fabric simulation is reliable and can be used for setting the heating boundary conditions of the electric heating clothing heat transfer model.

[0088] Table 1 Comparison between fabric experimental data and simulation data

[0089]

[0090] Simulation experiment of the electric heating clothing heat transfer model: After the verification of the electric heating fabric system heat transfer model, the actual inner layer temperature values of the combined layer of the electric heating clothing after heating stably at low gear (38 °C), medium gear (45 °C), and high gear (50 °C) obtained by fabric simulation are 37.765 °C, 43.437 °C, and 47.486 °C respectively. In addition, for the boundary condition setting of the electric heating clothing heat transfer model, the skin is also set at a constant skin temperature of 35 °C for steady-state research to obtain the stable result. Then, using the previous steady-state result as the initial temperature value, set the skin layer at 58 W / m 2The transient simulation study was started with the constant power and the heating sheet set to the actual temperature value of the corresponding inner layer of the heating part. The simulation duration was 30 min and the time step was 1 min. A total of three groups of simulations with different heating temperatures were carried out.

[0091] The relative error between the simulated value of the electric heating clothing wearing model at the end of the experiment and the skin temperature value of the warm body dummy in the three verification experiments was calculated. Figures 5(a), 5(b), and 5(c) are the temperature - verification temperature line graphs of the electric heating clothing heat transfer model in the electric heating clothing heat transfer simulation method of the embodiment of the present invention at heating temperatures of 38 °C, 45 °C, and 50 °C respectively. It can be clearly observed from the line graphs that the temperature change rate of the simulated temperature in the initial stage is significantly greater than that of the experimental temperature. The simulated temperature quickly tends to be stable after about 3 min, while the experimental temperature gradually tends to be stable. The reason for the above situation may be that the heat transfer of the heating sheet needs to pass through several layers of fabrics and the air layer between the fabrics, while the clothing in the electric heating clothing heat transfer model is set as a single - layer material, and the heating part is directly set to a constant temperature at stability. Therefore, the heat transfer is fast and the temperature stabilizes quickly. However, it can be seen that in the later stage of the temperature curve, the simulated temperature value is already relatively close to the experimental temperature value. Table 2 shows the comparison between the clothing experiment data and the simulation data. The relative errors of the three - gear heating are all less than 1.89%, which can prove that there is a good agreement between the simulated value and the experimental value. This shows that the simulation accuracy of the electric heating clothing heat transfer model is good, and the simulation method of using the heating temperature value obtained by simulating through the electric heating fabric system heat transfer model for setting the temperature of the heating position in the electric heating clothing heat transfer model is feasible.

[0092] Table 2 Comparison between clothing experiment data and simulation data

[0093]

[0094] S4: Based on the verified model group (i.e., the verified electric heating clothing heat transfer model and the electric heating fabric system heat transfer model) and the model combination application method, a temperature prediction model of the temperature of the heating part of the clothing inner layer, parameters such as the air layer thickness and the heating temperature can be established to guide the setting of the boundary conditions of the heating temperature in the electric heating clothing heat transfer model. Parametric simulation experiments are carried out by changing parameters such as the heating position of the heating sheet on the clothing, the heating sheet size, the heating sheet distribution, the heating sheet temperature, the ambient temperature, the clothing thermal resistance, and the human body metabolic power in the electric heating clothing heat transfer model, and a skin temperature prediction model is established to guide the design and evaluation of the electric heating clothing.

[0095] In one embodiment, a simulation experiment (parameterized simulation experiment) is conducted by changing parameters such as the thickness of the air layer under the clothing, heating temperature, ambient temperature, and human body power in the heat transfer model of the electrothermal fabric system. Taking the average temperature of the inner heating part of the electrothermal fabric as the dependent variable, the simulation results are subjected to multiple fitting to establish a temperature prediction model for the temperature of the inner heating part of the electrothermal clothing composite layer and influencing parameters such as the air layer thickness and heating temperature, which is used to guide the setting of the boundary conditions for the heating temperature of the electrothermal clothing heat transfer model.

[0096] In one embodiment, the simulation research method for the heating position of the heating sheet in the parameterized simulation experiment is as follows: In the electrothermal clothing heat transfer model, the midpoint of the geometric position of the heating sheet is moved longitudinally and transversely on the surface of the electrothermal clothing. The average skin temperature of each part of the human body when heating at each position point is obtained through clothing simulation calculation, and the position point with the best heating effect is selected therefrom.

[0097] In one embodiment, the simulation research on the size of the heating sheet in the parameterized simulation experiment is as follows: The shape of the heating sheet includes, but is not limited to, a rectangular heating sheet. The simulation research on the size of the rectangular heating sheet includes two aspects: the aspect ratio of the length and width of the heating sheet and the size of the heating sheet area. By changing the length and width of the heating sheet in the electrothermal clothing heat transfer model, the average skin temperature of each part of the human body when heating with heating sheets of different sizes is calculated, and the heating sheet size with the best heating effect is selected therefrom.

[0098] In one embodiment of the present invention, the simulation research on the distribution of the heating sheet in the parameterized simulation experiment is as follows: The heating sheets with different heating positions and sizes are combined for heating simulation. The average skin temperature of each part of the human body when heating with different combined heating methods is obtained through simulation calculation, and the heating sheet distribution method with the best heating effect is selected therefrom.

[0099] In one embodiment, parameters such as the heating sheet temperature, ambient temperature, clothing thermal resistance, and human body metabolic power are parameterized through the setting of the boundary conditions of the model, and a skin temperature prediction model is established.

[0100] The electrothermal clothing heat transfer simulation method provided by the present application is used for the design example of the electrothermal clothing as follows:

[0101] Example 1: Based on the established heat transfer model of the electrothermal fabric system and the electrothermal clothing heat transfer simulation method, a temperature prediction model for the inner heating temperature of the electrothermal clothing composite layer and parameters such as the air layer thickness and heating temperature is established, which is used to guide the setting of the boundary conditions for the heating temperature of the electrothermal clothing heat transfer model. The specific implementation method is as follows:

[0102] For the dressing simulation of an electric heating garment with a heating sheet size of 9.5 cm * 5 cm, a temperature prediction model of the heating part temperature of the inner layer of the electric heating clothing composite layer with respect to parameters such as the air layer thickness and heating temperature is established to guide the setting of the heating temperature boundary conditions under corresponding parameter conditions in the electric heating dressing heat transfer model.

[0103] The experimental design of fabric simulation is carried out by the method of orthogonal design, with the average air layer thickness between the inner garment layer and the skin layer , the average air layer thickness between the electric heating clothing composite layer and the inner garment layer , the heating temperature , the ambient temperature , the human body power , and the thermal resistance of the electric heating clothing layer as independent variables, and the actual temperature of the heating part of the inner layer of the electric heating clothing composite layer (°C) as the dependent variable for simulation experiments, where each research parameter is divided into 12 levels. The simulation results are shown in Table 3. The experimental results are analyzed by the regression analysis method to determine the mathematical relationship between the actual temperature of the inner layer of the electric heating clothing layer and the influencing factors, so as to establish a temperature prediction model for the heating part of the inner layer of the electric heating clothing layer when the heating sheet is heating:

[0104] (1)

[0105] Among them, (mm) is the average air layer thickness between the inner garment layer and the skin layer, (mm) is the average air layer thickness between the electric heating clothing composite layer and the inner garment layer, is the ambient temperature (°C), is the human body power (W / m 2 ), is the thermal resistance of the electric heating clothing composite layer (m 2 · °C · W -1 ), is the heating temperature (°C). The goodness of fit of the equation is 0.9869, indicating that the model has a good goodness of fit.

[0106] Table 3 Simulation results of the actual temperature of the inner layer of the electric heating clothing composite layer

[0107]

[0108] The above temperature prediction model is used to determine the heating temperature boundary condition settings for the heating parts under the corresponding parameter conditions of the electric heating clothing heat transfer model. For example, parameters such as the thickness of the air layer under the clothing, the ambient temperature, and the human body power corresponding to the heating parts in the electric heating clothing heat transfer model are input into the temperature prediction model to obtain the actual temperature value of the inner layer of the electric heating clothing combination layer, and this value is used for the temperature setting of the heating parts in the electric heating clothing heat transfer model. The skin temperature of each part of the human body is obtained through clothing simulation, and based on this, the thermal comfort of the electric heating clothing is evaluated or the electric heating clothing is optimized in design. This temperature prediction model will help improve the simulation accuracy and convenience of clothing simulation design.

[0109] Example 2: A specific implementation method for the simulation design of the longitudinal and transverse heating positions on the back of an electric heating clothing based on the established model group and the electric heating clothing heat transfer simulation method:

[0110] Taking the back of the clothing as the research part, the midpoints of the heating sheet positions are moved longitudinally and transversely respectively. Through simulation calculations, the average skin temperature of the upper body of the human body (including the upper trunk, head, arms, and hands), the average skin temperature of the upper trunk, and the average skin temperature of the back are obtained when heating at each position point, and the position point with the best heating effect is selected therefrom. The simulation experiment sets the ambient temperature at -10°C, the heating temperature at 45°C, and the human body power at 70 W / m 2 (human body stationary standing power). By referring to the size of the heating sheet in the existing heating component fabric and combining it with the shape of the human back, the heating sheet is designed as a vertical rectangle with a length and width of 9.5 cm × 5 cm in the heating sheet position research, and the distance between the midpoint of the heating sheet and the human body midline is 5 cm. To determine the optimal heating position of the heating sheet longitudinally on the back, the heating sheet is heated and simulated at different longitudinal positions on the back. For the convenience of geometric modeling, a "track" for the longitudinal movement of the heating sheet is constructed on the back, as shown in Figure 6(a). Figure 6(a) is a schematic diagram of the longitudinal displacement of the heating sheet on the back in an embodiment of the electric heating clothing heat transfer simulation method of the present invention, where the dot is the geometric midpoint of the heating sheet. Taking the midpoint height h (cm) of the heating sheet as a variable, the height value h represents the height of the midpoint of the heating sheet from the bottom edge of the clothing, and the height range is set to 15 - 55 cm, with a moving step of 2 cm. Among them, the lowest position (h = 15 cm) and the highest position (h = 55 cm) of the heating sheet.

[0111] First, the air layer under the clothing at each heating position in the electric heating clothing heat transfer model is measured respectively to obtain the average air layer thickness d1 (mm) between the inner clothing layer and the skin layer and the average air layer thickness d2 (mm) between the electric heating clothing layer and the inner clothing layer. After importing the air layer thickness into the electric heating fabric system heat transfer model, the actual temperature of the heating part of the inner layer of the electric heating clothing layer is obtained through simulation calculation of the electric heating fabric system heat transfer model (°C).

[0112] Match the midpoint height h with the corresponding and conduct steady-state simulations of specified combinations in the electric heating clothing heat transfer model to obtain the average temperature of the upper torso and the average temperature of the back of the human body. A total of 21 groups of clothing steady-state simulations were carried out. To analyze the temperature data at different height positions, a double y-axis line graph was plotted with the back temperature and the upper torso temperature as the dependent variables and the midpoint height h as the independent variable, as shown in Figure 7 . Figure 7 Figure 6(a) is a temperature-back position height line graph of a heat transfer simulation method for an electric heating clothing provided by the present invention under an embodiment. According to Figure 7 , it can be seen that when the height of the heating patch is 55 cm, the skin temperature of the upper torso is the highest and the heating effect is the best, followed by the height of 47 cm. When the heating height is 55 cm, the heating part is the shoulder, and the small air layer under the clothing makes the heating effect good. However, due to the small air layer, it is also easy to cause too high local temperature. Considering making the back of the human body heat more evenly, the heating patch height of 47 cm is selected.

[0113] Figure 6(b) is a schematic diagram of the lateral displacement of the heating patch on the back of the electric heating clothing in an example of the heat transfer simulation method of the electric heating clothing according to an embodiment of the present invention. Since the process of selecting the optimal position for the lateral movement of the heating patch is similar to the process of selecting the optimal position for the longitudinal movement, this embodiment will not be described in detail. Finally, the optimal position for the lateral movement of the heating patch is obtained as follows: the distance between the geometric midpoint of the heating patch and the vertical midline of the electric heating clothing (the symmetric line where the human body is cut) (i.e., the lateral distance L in Figure 6(b)) is 10.5 cm.

[0114] It should be noted that in Example 2, only the upper torso and the back are measured because the movement of the heating patch position is mainly the longitudinal or lateral movement on the upper torso, which has a greater impact on the upper torso. Therefore, parts such as the arms are not considered, so the measurement of the average skin temperature of the upper body is ignored.

[0115] Example 3: A specific implementation method based on the established model group and the heat transfer simulation method of the electric heating clothing for the aspect ratio simulation design of the rectangular heating patch on the back of the electric heating clothing:

[0116] The area of the heating patch is 47.5 cm 2, the midpoint position of the rectangular heating sheet remains unchanged. On this basis, the length-width ratio of the heating sheet is changed, and a total of 7 length-width ratios (4 / 1, 3 / 1, 2 / 1, 1 / 1, 1 / 2, 1 / 3, 1 / 4) are selected for the simulation calculation of the model. First, the air layer under the clothing of the heating sheet with different length-width ratios in the electric heating clothing heat transfer model is measured respectively to obtain the average air layer thickness d1 (mm) between the long-sleeved underwear layer and the skin layer, and the average air layer thickness d2 (mm) between the electric heating clothing layer and the underwear layer. After importing the average air layer thicknesses d1 and d2 into the electric heating fabric system heat transfer model, the actual temperature of the heated part of the inner layer of the electric heating clothing composite layer is obtained through the simulation calculation of the electric heating fabric system heat transfer model. (°C). In the electric heating clothing heat transfer model, different length-width ratio heating sheets are matched with the corresponding . A total of 7 steady-state simulations are carried out to obtain the average temperature of the upper body and the average temperature of the back of the human body. From this, a line graph of the upper body temperature and the back temperature of the heating sheet with different length-width ratios is drawn, as shown in Figure 8 , and the corresponding surface temperature contour map of the human back is shown in Figure 9 . When r is 2 / 1 and 1 / 2, the difference in the upper body temperature is not significant; when r is 3 / 1 and 4 / 1, the upper body temperature is significantly higher than when r is 1 / 3 and 1 / 4, indicating that at this heating position, the heating effect of the vertical heating sheet (height greater than width) is better than that of the horizontal heating sheet (width greater than height). The reason may be that the shape of the back is that the back height is greater than the back width, so the vertical heating sheet is more conducive to the uniform diffusion of heat on the back. According to Figure 8 the temperature line graph, when the length-width ratio r of the heating sheet is 3 / 1, the skin temperature is the highest, that is, the heating sheet with this length-width ratio has the best heating effect at this position.

[0117] It should be noted that since the length-width ratio of the heating sheet affects the heat transfer of human body parts such as the arms and armpits, the average upper body temperature including the temperature of the human arm part is measured in Example 3 as an evaluation index.

[0118] Example 4: Based on the established model group and the electric heating clothing heat transfer simulation method, a parametric simulation study on back heating is carried out, and a skin temperature prediction model is established.

[0119] On the basis of determining the back heating position and the aspect ratio of the heating sheet, comprehensively considering the influence of environmental factors (ambient temperature), human factors (human metabolic power), clothing factors (thermal resistance of the outer fabric of the clothing), and heating sheet (heating area, heating temperature) on the heat transfer performance of the electrically heated clothing, parametric simulation of the model is carried out. For the research on the heating sheet, on the basis of having determined the heating position and the aspect ratio of the heating sheet, the influence of the heating sheet area parameter and the heating temperature parameter will be added. Based on Example 3, the aspect ratio of the heating sheet for back heating is selected as 3 / 1. The heating sheet area will use the heating sheet width c (cm) as an index, then the length (height) of the heating sheet is 3*c respectively, and the heating sheet area is 3*c 2 .

[0120] The orthogonal design method is used to design the fabric simulation and the dressed simulation experiments respectively. For each research parameter, it is divided into 5 levels. First, measure the average air layer thickness between the inner layer of the underwear and the skin layer and between the electrically heated clothing layer and the inner layer of the underwear at the heating part under different heating sheet sizes, and obtain the air layer thickness values d1 and d2. Substitute the d1 and d2 values into the heat transfer model of the electrically heated fabric system, and through simulation calculation, obtain the actual temperature of the inner layer of the heated part of the electrically heated clothing combination layer under the corresponding test conditions , and the test results are shown in Table 3. Substitute the actual temperature of the inner layer of the electrically heated clothing combination layer and other test factor values into the electrically heated dressed heat transfer model for simulation calculation, and the results are shown in Table 4

[0121] Table 4 Simulation results of the heat transfer model of the electrically heated fabric system

[0122]

[0123] Use the regression analysis method to analyze the test results, determine the mathematical relationship between the skin temperature and the influencing factors, and thus establish a skin temperature prediction model when the electrically heated clothing is heated

[0124] Set the test parameters and the thickness of the air layer under the clothing of the corresponding heating sheet in the heat transfer model of the electrically heated fabric system, and obtain the actual temperature of the inner layer of the electrically heated clothing combination layer through simulation calculation (°C). Take each test parameter (ambient temperature , human power , thermal resistance of the electrically heated clothing combination layer , heating temperature , heating sheet width ) as independent variables, and the actual temperature of the inner layer of the electrically heated clothing combination layer as the dependent variable for multiple linear fitting, and obtain the actual temperature (°C) of the inner layer of the electrically heated clothing combination layer for back heating. The fitting equation is as follows

[0125] (2)

[0126] Wherein, is the ambient temperature (°C), is the human body power (W / m 2 ) is the thermal resistance of the combined layer of the electric heating clothing (m 2 ·°C·W -1 ) is the heating temperature (°C), is the width of the heating sheet (cm). The model passes the F-test (p-value < 0.05), and the goodness of fit of the fitting equation is 0.999, indicating that the model is meaningful and the goodness of fit is good.

[0127] Substitute the actual temperature of the inner layer of the combined layer of the electric heating clothing corresponding to 25 groups of test conditions obtained by fabric simulation into the heat transfer model of electric heating clothing, and obtain the skin temperature of the heating part, the back skin temperature and the upper torso skin temperature and the upper body skin temperature through clothing simulation. Taking the skin temperature as the dependent variable, and the ambient temperature Ta, the human body power q, the thermal resistance R of the combined layer of the electric heating clothing, the actual temperature Th' of the inner layer of the combined layer of the electric heating clothing for back heating, and the width c of the heating sheet as the independent variables, a set of fitting equations for the skin temperature of each part under back heating is obtained through multiple linear fitting:

[0128] (3)

[0129] (4)

[0130] (5)

[0131] (6)

[0132] The equations all pass the F-test (p-value < 0.05), and the goodness of fit of each fitting equation is greater than 0.99, indicating that the model is meaningful and the fitting degree is good.

[0133] Substitute the fitting equation (2) of the actual temperature Th' of the inner layer of the combined layer of the electric heating clothing into the skin temperature equation set for back heating respectively, and obtain the equation set between the skin temperature and the ambient temperature Ta, the human body power q, the thermal resistance R of the combined layer of the electric heating clothing, the heating temperature Th, and the width c of the heating sheet, so as to establish the following back heating skin temperature prediction model:

[0134]

[0135] The application method of the skin temperature prediction model is as follows:

[0136] Calculate the predicted human skin temperature value under known conditions of various factors, so as to evaluate the thermal performance of the electric heating clothing.

[0137] According to different environmental temperatures or human activities (human metabolic power), set the heating temperature range and heating sheet size of the electric heating clothing. Since the human body will have a feeling of heat pain when the human skin temperature is greater than 41 °C, it is recommended that the skin temperature of the heating part should be less than 41 °C. Example Two

[0138] This example provides an electric heating clothing heat transfer simulation system, including:

[0139] The first construction module: used to establish an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model based on fluid dynamics;

[0140] The combined application module: used to establish a combined application method for the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model;

[0141] The verification module: used to conduct a verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model, and obtain the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method that pass the verification experiment;

[0142] The second construction module: used to establish a temperature prediction model based on the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method that pass the verification experiment, and the temperature prediction model is used to guide the setting of the heating part temperature of the electric heating clothing heat transfer model;

[0143] Alternatively, change the parameters of the heating sheet in the electric heating clothing heat transfer model that passes the verification experiment to conduct a parametric simulation experiment, and establish a skin temperature prediction model according to the results of the parametric simulation experiment, and the skin temperature prediction model is used to guide the design of the electric heating clothing. Example Three

[0144] This example provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the electric heating clothing heat transfer simulation method described in Example One. Example Four

[0145] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the electric heating clothing heat transfer simulation method described in Embodiment 1 are implemented.

[0146] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript.

[0147] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0148] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0150] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications that fall within the scope of the present application.

[0151] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to exhaustively list all implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A heat transfer simulation method for electric heating clothing, characterized in that: include: Step S1: Based on fluid dynamics, a heat transfer model of electric heating clothing and a heat transfer model of electric heating fabric system are established; The heat transfer model of the electrically heated clothing in step S1 includes a double-layer clothing geometry model and a human body geometry model, wherein: The human body geometric model is constructed by three-dimensional scanning; The double-layer clothing geometric model includes an electric heating clothing layer and a long-sleeved underwear layer, both of which are constructed using virtual fitting software. The electric heating clothing layer is provided with a heating sheet. The constructed human body geometric model and the double-layer clothing geometric model are imported into the simulation software to construct an electric heating clothing heat transfer model. The heat transfer model of the electric heating fabric system in step S1 includes: an outer layer combined fabric, a heating plate, a heating component fabric for surrounding the heating plate, an inner layer fabric, an underwear layer, and a skin layer, and the outer layer combined fabric, the heating plate, the heating component fabric for surrounding the heating plate, and the inner layer fabric are combined to form an electric heating clothing combined layer, and the heating component fabric is attached to the inner layer fabric; Step S2: Establishing a combined application method of an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model, including: The average air layer thickness of the heating part of the electric heating clothing layer where the heating plate is located is measured by the electric heating clothing heat transfer model, including measuring the average air layer thickness between the long-sleeved underwear layer and the skin layer of the human body geometric model, and setting it as , measure the average air layer thickness between the electric heating clothing layer and the long-sleeved underwear layer, and set it as ; Will As the average air thickness between the underwear layer and the skin layer in the heat transfer model of the electric heating fabric system, As the average air layer thickness between the electric heating clothing combination layer and the underwear layer in the heat transfer model of the electric heating fabric system, the geometric modeling of the heat transfer model of the electric heating fabric system is realized to simulate the real dressing state, and then the actual temperature of the heating part of the inner layer of the electric heating clothing combination layer is obtained by the fabric heat transfer simulation calculation and set as , wherein the inner layer of the electrically heated clothing combination layer is the layer of the electrically heated clothing combination layer close to the underwear layer; Step S3: conducting a verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model to obtain the electric heating clothing heat transfer model, the electric heating fabric system heat transfer model, and the combined application method that pass the verification experiment; Step S4: Based on the heat transfer model of the electric heating clothing and the heat transfer model of the electric heating fabric system that have passed the verification experiment, and the combined application method, a temperature prediction model is established, wherein the temperature prediction model is used to guide the setting of the temperature of the heating part of the heat transfer model of the electric heating clothing; Alternatively, the parameters of the heating plate in the heat transfer model of the electric heating clothing that has passed the verification experiment are changed to conduct a parametric simulation experiment, and a skin temperature prediction model is established based on the results of the parametric simulation experiment. The skin temperature prediction model is used to guide the design of the electric heating clothing.

2. The heat transfer simulation method of electric heating clothing according to claim 1, characterized in that: The method of conducting a verification experiment on the combined application method of the electric heating clothing heat transfer model and the electric heating fabric system heat transfer model in step S3 includes: The temperature sensor is pasted on the location of the heating plate corresponding to the inner layer of the electric heating clothing in reality to record the temperature data; Obtain a heating manikin, put long-sleeved underwear on the inner layer of the heating manikin, put on the outer layer of the heating manikin real electric heating clothing with temperature sensors attached, and record the skin temperature values ​​of various parts of the human body through the heating manikin; The temperature data of the inner layer of the actual electrically heated clothing obtained by the temperature sensor is used to verify the heat transfer model of the electrically heated fabric system, and the skin temperature data obtained by the heated manikin is used to verify the heat transfer model of the electrically heated clothing.

3. The heat transfer simulation method of electric heating clothing according to claim 1, characterized in that: The method of establishing a temperature prediction model in step S4 based on the heat transfer model of electric heating clothing and the heat transfer model of electric heating fabric system obtained through verification experiments and the combined application method includes: By verifying the experimental heat transfer model of electric heating clothing, the heat transfer model of electric heating fabric system, and combining the application method, a temperature prediction model of the heated part of the inner layer of the electric heating clothing combination layer when the heating plate is heated is constructed. The formula is: ； in, is the average air layer thickness between the underwear layer and the skin layer, is the average air layer thickness between the electric heating clothing combination layer and the underwear layer, is the ambient temperature, is the human body power, Thermal resistance of the combined layers of the electrically heated clothing, is the heating temperature; The temperature prediction model of the heating part of the inner layer of the electric heating clothing combination layer is used to set the temperature of the heating part where the heating plate is located in the electric heating clothing heat transfer model, and the skin temperature of each part of the heated manikin is obtained through clothing simulation to evaluate the thermal comfort of the electric heating clothing.

4. The heat transfer simulation method of electric heating clothing according to claim 1, characterized in that: The parameterized simulation experiment in step S4 includes: a heating plate heating position simulation experiment, a heating plate size simulation experiment, and a heating plate distribution simulation experiment combining the heating position of the heating plate and the size of the heating plate, wherein: The research method for simulating the heating position of the heating plate is as follows: in the heat transfer model of the electric heating clothing, the midpoint of the geometric position of the heating plate is used as a reference, and the position is moved longitudinally and transversely along the surface of the electric heating clothing layer respectively, and the average skin temperature of each part of the human body when heating at each position point during the movement is obtained through simulation calculation, and the position point with the best heating effect is selected; The heating plate size simulation experiment is as follows: the shape of the heating plate includes a rectangular heating plate, and by changing the aspect ratio and area of ​​the rectangular heating plate in the heat transfer model of the electric heating clothing, the average skin temperature of each part of the human body when heated by rectangular heating plates of different sizes is calculated, and the size of the rectangular heating plate with the best heating effect is selected; The heating plate distribution simulation experiment combining the heating position and shape of the heating plate is as follows: heating plates of different heating positions and different sizes are subjected to combined heating simulation, and the average skin temperature of each part of the human body under different combined heating methods is obtained through simulation calculation, and the heating plate distribution method with the best heating effect is screened out.

5. The heat transfer simulation method of electric heating clothing according to claim 4, characterized in that: The method for establishing a skin temperature prediction model according to the parameterized simulation experiment results in step S4 includes: When the electric heating clothing is used to heat the back of the human body, the heating position of the heating sheet on the back, the aspect ratio of the heating sheet, and the area of ​​the heating sheet are determined according to the results of the parametric simulation experiment, and then the designed heating sheet is obtained. According to the designed heating sheet, the temperature of the inner layer of the electric heating clothing layer for back heating is established. The fitting equation is: ； in, is the ambient temperature, is the human body power, Thermal resistance of the combined layers of the electrically heated clothing, is the heating temperature, is the width of the heating plate; The temperature of the inner layer of the electrically heated garment layer that heats the back Substitute the heat transfer model of electric heating clothing into the model and simulate the clothing of the human body geometry model to obtain the skin temperature of the heated part , back skin temperature , upper trunk skin temperature and upper body skin temperature , the fitting equations for the skin temperature of each part of the back heating are obtained, the formula is: ； ； ； ； The temperature of the inner layer of the back heating electrical heating garment layer The fitting equations are substituted into the skin temperature fitting equations of each part of the back heating to construct a skin temperature prediction model, and the formula is: 。 6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the heat transfer simulation method for electric heating clothing according to any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the heat transfer simulation method for electric heating clothing as claimed in any one of claims 1 to 5 are implemented.

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