Electric heating clothes heat transfer simulation method, equipment and medium

Abstract

The invention relates to an electric heating clothes heat transfer simulation method and device and a medium, and the method comprises the steps: building an electric heating dressing heat transfer model and an electric heating fabric system heat transfer model of the electric heating clothes; establishing a combined application method of the two models; performing a verification experiment on the combined application method of the two models to obtain an electric heating dressing heat transfer model, an electric heating fabric system heat transfer model and the combined application method which pass the verification experiment; based on the two models passing the verification experiment and in combination with an application method, establishing a temperature prediction model for guiding the temperature setting of the heating part of the electric heating dressing heat transfer model; or changing the parameters of the heating sheet in the electric heating dressing heat transfer model passing the verification experiment to carry out the simulation experiment, and establishing a skin temperature prediction model for guiding the design of the electric heating clothes. According to the invention, an application method combining the electric heating fabric system model and the electric heating clothes dressing model is constructed, so that the simulation result of the electric heating clothes is more real.

Description

Technical Field

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

[0002] Electric heating clothing has the advantages of fast heating speed, high warmth retention efficiency, light weight and washability, and is currently the most widely used heating cold-proof clothing. At present, the more common method for the design and performance evaluation of electric heating clothing is to conduct experiments on heated mannequins or real people, but the experimental parameters that can be set are limited, the experimental cycle is long, and it is impossible to further study its heat transfer mechanism. At present, the mechanism of the effect of electric heating clothing parameter design on its heat transfer performance is still not clear enough, resulting in a lack of scientific basis for the design of electric heating clothing.

[0003] In recent years, the method of constructing numerical models based on the theory of Computational Fluid Dynamics (CFD) has been introduced into the field of clothing thermal comfort research. By simulating and predicting experimental results under certain conditions, numerical calculation and visual analysis of experimental mechanisms can be performed. While 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 facilitates systematic scientific research on influencing factors and their correlation. At present, the simulation research on clothing is mainly divided into two levels: fabric simulation and human clothing simulation. The Chinese patents with publication numbers CN104809269A and CN117933003A use different modeling methods to simulate the heat transfer process of fabrics. The fabric model can accurately simulate the multi-layer combination and organizational structure of the fabric, but due to the difference between two-dimensional fabrics and three-dimensional clothing, it is impossible to simulate the heat transfer of irregular air layers under clothing in real clothing conditions. The clothing model can simulate the interactive heat transfer process between the human body and clothing in real form. However, due to the large number of grids and the high complexity of multi-physics field coupling, the simulation requires high computer computing power. The model often simplifies the real structure of the fabric and directly sets the heating power or heating temperature on the surface of the clothing. However, the actual electric heating cold-proof clothing is a multi-layer fabric structure, and the heating plate is 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 of the heating plate transferred to the clothing surface and the heating temperature of the heating plate. Therefore, setting the heating temperature directly on the surface of the clothing model does not conform to the actual heat transfer situation, and it is impossible to simulate the heat transfer of the electric heating plate between the multi-layer fabric of the clothing, which affects the results of the heat transfer experiment. In addition, the current clothing model research is all single-piece clothing, which does not conform to the wearing situation in a cold environment.

[0004] It can be seen that the existing technology cannot truly reflect the complex three-dimensional heat transfer characteristics in the electric heating clothing, and thus cannot accurately design the electric heating clothing. Summary of the invention

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

[0006] In order to solve the above technical problems, the present invention provides a heat transfer simulation method for electric heating clothing, comprising:

[0007] 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;

[0008] Step S2: establishing a combined application method of a heat transfer model of electric heating clothing and a heat transfer model of an electric heating fabric system;

[0009] 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;

[0010] 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;

[0011] 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.

[0012] In one embodiment of the present invention, 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:

[0013] The human body geometric model is constructed by 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 using virtual fitting software. The electric heating clothing layer is provided with a heating plate. The constructed human body geometric model and the double-layer clothing geometric model are imported into simulation software to construct an electric heating clothing heat transfer model.

[0015] In one embodiment of the present invention, 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 combination layer, and the heating component fabric is attached to the inner layer fabric.

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

[0017] 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 ;

[0018] 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;

[0019] The actual temperature of the heating part of the inner layer of the electric heating clothing combination layer It is applied to the setting of the boundary temperature of the heating part in the electric heating clothing heat transfer model, and the skin temperature of each part of the human body geometric model is obtained by performing clothing simulation calculation on the human body geometric model.

[0020] In one embodiment of the present invention, 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:

[0021] 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;

[0022] 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;

[0023] 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.

[0024] In one embodiment of the present invention, 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 through verification experiments, and the combined application method includes:

[0025] 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:

[0026] ;

[0027] 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;

[0028] 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.

[0029] In one embodiment of the present invention, 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:

[0030] 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;

[0031] 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;

[0032] 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.

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

[0034] 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:

[0035] ;

[0036] 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;

[0037] 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 skin temperature fitting equations of each part of the back heating are obtained, the formula is:

[0038] ;

[0039] ;

[0040] ;

[0041] ;

[0042] 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:

[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 in the memory and executable on the processor, wherein the processor implements the steps of the above electric heating clothing heat transfer simulation method when executing the computer program.

[0045] In order 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 for electric heating clothing are implemented.

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

[0047] The present invention proposes an application method combining an electric heating fabric system model with an electric heating clothing model. The method combines the advantages of the electric heating fabric system heat transfer model and the electric heating clothing heat transfer model, so that the simulation results of the electric heating clothing are more consistent with the actual situation of heat transfer, and the heat transfer research is 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 considers the influence of environmental factors, clothing factors, human factors, and heating plate factors (heating position, size, temperature) on the heat transfer performance of the electric heating clothing. The heat transfer analysis can be performed on the numerical results and visual images obtained by the model calculation to reveal the influence mechanism of the key parameters of the electric heating clothing on the comfort of the wearer.

[0049] The present invention studies the heat transfer of electric heating fabric systems and the heat transfer of electric heating clothing through simulation. The application of simulation technology to electric heating clothing reduces the experimental time and design cost of electric heating clothing. The parametric design of electric heating clothing can be achieved by changing the parameter settings in the prediction model, making the design of electric heating clothing more scientific and convenient, and providing guidance for actual production and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0051] Figure 1 It is a flow chart 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 a heat transfer model of an electric heating fabric system in a heat transfer simulation method for electric heating clothing in an embodiment of the present invention;

[0053] Figure 3 It is a schematic diagram of measuring the average air layer conversion of the heat transfer model of the electric heating clothing and the heat transfer model of the electric heating fabric system in the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention;

[0054] FIG4 (a) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating fabric system in the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention when the heating temperature is 38°C;

[0055] FIG4 (b) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating fabric system in the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention when the heating temperature is 45°C;

[0056] FIG4 (c) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating fabric system in the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention when the heating temperature is 50°C;

[0057] FIG5 (a) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating clothing in the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention when the heating temperature is 38°C;

[0058] FIG5( b ) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating clothing in the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention when the heating temperature is 45° C.;

[0059] FIG5( c ) is a line graph of the simulated temperature-verification temperature of the heat transfer model of the electric heating clothing in the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention when the heating temperature is 50° C.;

[0060] FIG6 (a) is a schematic diagram of the longitudinal displacement of the back of the heating plate of the electric heating clothing heat transfer simulation method in one embodiment of the present invention;

[0061] FIG6 (b) is a schematic diagram of the lateral displacement of the back of the heating plate in an example of the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention;

[0062] Figure 7 It is a line graph of temperature-back position height in one embodiment of the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention;

[0063] Figure 8It is a line graph of the upper body temperature and the back temperature heated by heating sheets with different aspect ratios in one embodiment of the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention;

[0064] Fig. 9 It is a temperature cloud diagram of the human back surface of heating plates with different aspect ratios in one embodiment of the heat transfer simulation method of electric heating clothing in the present invention. DETAILED DESCRIPTION

[0065] The present invention is 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 implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0066] The present invention relates to a heat transfer simulation method for electric heating clothing, comprising:

[0067] 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;

[0068] Step S2: establishing a combined application method of a heat transfer model of electric heating clothing and a heat transfer model of an electric heating fabric system;

[0069] 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;

[0070] 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;

[0071] 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.

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

[0073] like Figure 1 As shown, Figure 1 A flowchart of the establishment and application method of a heat transfer simulation method for electric heating clothing provided by the present invention, the steps comprising:

[0074] S1: Based on computational fluid dynamics, the heat transfer model of electric heating clothing and the heat transfer model of electric heating fabric system are established through fluid dynamics simulation software.

[0075] In one embodiment, it also 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 field 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 geometry model and a human body geometry model, wherein the human body geometry model is constructed by three-dimensional scanning, and the double-layer clothing geometry model (including the electric heating clothing layer and the long-sleeved underwear layer) is constructed by 3D CLO virtual fitting software, and then the human body geometry model and the double-layer clothing geometry model are imported into COMSOL simulation software to construct the electric heating clothing heat transfer model.

[0077] In one embodiment, see Figure 2 The heat transfer model of the electric heating fabric system includes several fabric geometric models, which are simplified and simulated in the simulation software through vertical flat rectangles parallel to each other. The several fabric geometric models include an outer combined fabric, a heating plate, a heating component fabric for surrounding the heating plate (including an upper and lower layer of fabric that just surrounds the heating plate), an inner fabric, an underwear layer, a skin layer, and an air layer between fabrics (including an air layer between the underwear layer and the skin layer, and an air layer between the electric heating clothing combined layer and the underwear layer).

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

[0079] Specifically, the scanned human body geometry model is imported into the 3D CLO virtual fitting software, and the corresponding pattern making and stitching are performed 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 the clothing has two pieces (electric heating clothing layer (belonging to the coat) and long-sleeved underwear layer (belonging to the underwear)), the long-sleeved underwear layer should be stitched and tried on first, and the clothing should be adjusted on the model and set to solidify. Then the electric heating clothing layer is stitched and tried on, and the positions of the hat and other parts of the clothing are adjusted with reference to the real clothing wearing pictures, so that the model is close to the real wearing situation. After that, the double-layer clothing geometry model and the human body geometry model are imported into the COMSOL software for positioning, segmentation and other processing, and the heating position of the heating plate is marked in the electric heating clothing layer. Since the heat transfer of the electric heating clothing layer (i.e., an electric heating jacket) mainly involves the upper body of the human body, and based on the symmetry of the human body, the human body geometry model is simplified to 1 / 2 upper body. The clothing model is a double-layer clothing geometric model of outerwear and underwear. The thickness, thermal conductivity and other data of the electric heating clothing layer fabric and the long-sleeved underwear layer fabric are measured by using a thickness gauge and a KES-F7 thermal conductivity tester to measure the existing clothing materials. The physical field setting of the electric heating clothing heat transfer model: the turbulence field and the fluid heat transfer field are coupled to form a non-isothermal flow physical field, and the surface-to-surface radiation field and the fluid heat transfer field are coupled to form a surface-to-surface heat transfer radiation physical field. The skin layer heat flux is set to 58W / m 2 To simulate the metabolic rate of a male body sitting still, the heating plate is at a constant temperature to simulate the uniform heating of the electric heating film heating plate. The wind speed is set to 0.1m / s to simulate the natural wind speed in the room. The radiation emissivity of the skin layer to the fabric is 0.95, and the radiation emissivity of the fabric surface to the outside is 0.85.

[0080] Specifically, when geometrically modeling the heat transfer model of the electric heating fabric system, the fabric is simplified into a flat cuboid. Since the electric heating sheet is an electric heating film with a thickness of micrometers, this embodiment simplifies it into a rectangle without thickness. Since the double-layer clothing geometric model includes an electric heating clothing layer (jacket) and a long-sleeved underwear layer (underwear), an underwear layer is established between the electric heating clothing combined fabric and the skin layer in the heat transfer model of the electric heating fabric system. Figure 2This is a schematic diagram of the heat transfer model of the electric heating fabric system of the heat transfer simulation method of the electric heating clothing in the embodiment of the present invention, including an outer layer of combined fabric, a heating plate, a heating component fabric for surrounding the heating plate, an inner layer of fabric, an underwear layer, a skin layer and an air layer between the fabrics, and the outer layer of combined fabric, the heating plate, the heating component fabric for surrounding the heating plate, and the inner layer of fabric are combined to form a combined layer of electric heating clothing. The length and width of the entire heat transfer model of the electric heating fabric system are set to 50cm×50cm. The physical parameters of each fabric material in the heat transfer model of the electric heating fabric system are obtained by measuring the existing clothing materials using a thickness measuring instrument and a KES-F7 thermal conductivity tester. The physical fields of the heat transfer model of the electric heating fabric system select two physical fields: solid heat transfer and surface-to-surface radiation, and couple the two physical fields. The heat flux of the skin layer is set to 58W / m 2 Simulating the sitting metabolism of a male human body, the heating plate is at a constant temperature to simulate the uniform heating of the electric heating film heating plate. The radiation emissivity of the skin layer to the fabric is 0.95, and the radiation emissivity of the fabric surface to the outside is 0.85. Different local positions of clothing correspond to different wind speeds. It is difficult to set the initial wind speed for the local clothing of the electric heating fabric system heat transfer model. Therefore, only natural convection is considered when setting the boundary conditions of the electric heating fabric system heat transfer model, that is, the vertical wall external natural convection is set on the surface of the outer combined fabric, and the air layer between the fabrics is set to internal natural convection.

[0081] S2: Establish a combined application method of an electric heating clothing heat transfer model and an electric heating fabric system heat transfer model: The average air layer thickness of the heating part of the electric heating clothing layer where the heating plate is located is measured through the electric heating clothing heat transfer model, and the average air layer thickness is used as a parameter to complete the geometric modeling of the electric heating fabric system heat transfer model to simulate the actual dressing state. Then, the electric heating fabric system heat transfer model is simulated and calculated (all simulation calculations in this embodiment are implemented through COMSOL simulation software) to obtain the actual temperature of the inner layer of the heating part of the inner layer of the electric heating clothing combination layer (the inner layer of the electric heating clothing combination layer is the layer of the electric heating clothing layer close to the underwear layer), and the actual temperature will be used to set the boundary conditions of the heating part in the electric heating clothing heat transfer model.

[0082] For example, see 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, and the specific steps include: measuring the average air layer thickness of the heated 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), set 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), set as d2 (mm); inputting the d1 and d2 values ​​into the electric heating fabric system heat transfer model for geometric modeling, and then calculating the actual temperature of the inner layer (where the heating plate is located) of the electric heating clothing combination layer through fabric heat transfer simulation, set as (℃); the actual temperature of the inner layer of the heating part obtained by fabric simulation is applied to the setting of the boundary temperature of the heating part in the heat transfer model of electric heating clothing, and the skin temperature of each part of the human body geometric model is obtained by performing clothing simulation calculation on the human body geometric model.

[0083] S3: Conduct accuracy verification experiments 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 have passed the verification experiment.

[0084] For example, the accuracy verification of the heat transfer model of electric heating clothing and the heat transfer model of electric heating fabric system includes the following specific steps:

[0085] The MSR temperature sensor is attached to the center of the heating plate corresponding to the inner layer of the electric heating clothing in reality, and the temperature value of the heated part is recorded. A heating manikin is obtained. The inner layer of the heating manikin is wearing a long-sleeved underwear, and the outer layer is an electric heating suit with a temperature sensor attached. The skin temperature values ​​of various parts of the human body of the heating manikin are recorded; the ambient temperature of the artificial climate chamber is adjusted to a stable temperature of 5°C, and the heating manikin wearing the electric heating suit (unheated) is set to a constant temperature mode of 35°C on the surface; after the surface temperature of the climate chamber and the manikin is stable, the heating manikin is set to 58 W / m 2 The electric heating suit started heating at the same time in constant power mode. The experiment lasted for 30 minutes, and the temperature value was recorded every 1 minute. The electric heating suit was heated at low (38°C), medium (45°C), and high (50°C) respectively. Three groups of experiments were conducted, and each group of experiments was repeated three times. Finally, the temperature data of the heated part of the electric heating suit obtained by the temperature sensor was used to verify the heat transfer model of the electric heating fabric system, and the skin temperature data of the warm manikin was used to verify the heat transfer model of the electric heating clothing.

[0086] Simulation experiment of heat transfer model of electric heating fabric system: First, set a temperature point probe at the heating position of the inner layer of the electric heating clothing combination layer (equivalent to the part of the inner fabric close to the underwear layer), and the probe position is consistent with the verification experiment position. The average air layer thickness d1 (26.286mm) between the long-sleeved underwear layer and the skin layer and the average air layer thickness d2 (12.517mm) between the electric heating clothing layer and the underwear layer measured in the electric heating clothing heat transfer model are input into the electric heating fabric system heat transfer model for geometric modeling. Set the model ambient temperature to 5°C, the skin layer constant skin temperature to 35°C, and simulate the steady-state solution. Then use the previous steady-state result as the initial temperature value, and set the skin layer to 58W / m 2 The transient simulation was started with constant power and constant temperature of the heating plate. The simulation lasted 30 minutes and the time step was 1 minute. Three groups of simulations were performed with low (38°C), medium (45°C), and high (50°C) heating temperatures.

[0087] The temperature data of the inner layer of the electric heating clothing heating position obtained by the temperature sensor is compared with the simulation data of the electric heating fabric system heat transfer model. Figure 4 (a), Figure 4 (b), and Figure 4 (c) are respectively the simulated temperature-verification temperature line graphs of the electric heating fabric system heat transfer model of the electric heating clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 38 ℃, 45 ℃, and 50 ℃. It can be seen that the simulation curve is very similar to the experimental value change trend. Table 1 is a comparison of the fabric experimental data and the simulation data. The relative error values ​​of the three heating levels are all less than 1.26%, which can prove that the simulation value and the experimental value have a good agreement. It shows that the simulation method of measuring the thickness of the air layer under the clothes 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 temperature of the inner layer of the heating part obtained by the fabric simulation is reliable and can be used to set the heating boundary conditions of the electric heating clothing heat transfer model.

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

[0089]

[0090] Simulation experiment of heat transfer model of electric heating clothing: After the heat transfer model of electric heating fabric system was verified, the actual temperature values ​​of the inner layer of the electric heating clothing combination layer after heating and stabilization at low (38°C), mid-range (45°C), and high (50°C) temperatures were obtained through fabric simulation to be 37.765°C, 43.437°C, and 47.486°C respectively. In addition, the boundary condition setting of the heat transfer model of electric heating clothing also sets the skin to a constant skin temperature of 35°C, simulates the steady-state study, and obtains the stable results. After that, the previous steady-state result is used as the initial temperature value, and the skin layer is set to 58W / m 2The transient simulation study was started with constant power and the heating plate set to the actual temperature value of the inner layer of the corresponding heating part. The simulation time was 30 minutes and the time step was 1 minute. A total of three groups of simulations with different heating temperatures were performed.

[0091] The relative error between the simulated value of the electric heating clothing model at the end of the experiment and the skin temperature value of the heated mannequin in the three verification experiments was calculated. Figures 5 (a), 5 (b), and 5 (c) are the simulated temperature-verification temperature line graphs of the electric heating clothing heat transfer model of the electric heating clothing heat transfer simulation method in the embodiment of the present invention when the heating temperature is 38 ℃, 45 ℃, and 50 ℃. It can be clearly observed from the line graph that the temperature change rate of the simulated temperature in the initial stage is significantly greater than the experimental temperature. The simulated temperature quickly stabilizes after about 3 minutes, while the experimental temperature gradually stabilizes. The reason for the above situation may be that the heat transfer of the heating plate needs to pass through several layers of fabric 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 when stable, so the heat transfer is fast and the temperature is stable. However, it can be seen that in the later stage of the temperature curve, the simulated temperature value is close to the experimental temperature value. Table 2 shows the comparison between the experimental data and the simulation data of the clothing. The relative errors of the three heating levels are all less than 1.89%, which proves that the simulation value and the experimental value have good agreement. This shows that the simulation accuracy of the heat transfer model of electric heating clothing is good, and the simulation method of the heating temperature value obtained by simulating the heat transfer model of the electric heating fabric system for the temperature setting of the heating position of the heat transfer model of electric heating clothing is feasible.

[0092] Table 2 Comparison of clothing experimental data and simulation data

[0093]

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

[0095] In one embodiment, a simulation experiment (parametric simulation experiment) is performed by changing parameters such as the thickness of the air layer under the clothes, the heating temperature, the ambient temperature, and the human body power in the heat transfer model of the electric heating fabric system as independent variables, and the average temperature of the inner heating part of the electric heating fabric is used as the dependent variable. The simulation results are multivariately fitted to establish a temperature prediction model of the temperature of the inner heating part of the electric heating clothing combination layer and the influencing parameters such as the air layer thickness and the heating temperature, which is used to guide the setting of the boundary conditions of the heating temperature of the electric heating clothing heat transfer model.

[0096] In one embodiment, a method for simulating the heating position of a heating plate in a parametric simulation experiment is as follows: in a heat transfer model of electric heating clothing, the midpoint of the geometric position of the heating plate is moved longitudinally and transversely on the surface of the electric heating clothing, and the average skin temperature of each part of the human body when heated at each position point is obtained through clothing simulation calculation, thereby selecting the position point with the best heating effect.

[0097] In one embodiment, the simulation study of the size of the heating plate in the parametric simulation experiment is as follows: the shape of the heating plate includes but is not limited to a rectangular heating plate, wherein the simulation study of the size of the rectangular heating plate includes two aspects: the aspect ratio of the heating plate and the area size of the heating plate. By changing the length and width of the heating plate in the heat transfer model of the electric heating clothing, the average skin temperature of various parts of the human body when heated by heating plates of different sizes is calculated, and thereby the size of the heating plate with the best heating effect is screened out.

[0098] In one embodiment of the present invention, the distribution simulation study of the heating plates in the parametric simulation experiment is as follows: heating plates with different heating positions and 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, thereby screening out the heating plate distribution method with the best heating effect.

[0099] In one embodiment, parameters such as the heating plate temperature, ambient temperature, clothing thermal resistance, and human metabolic power are all parameterized and simulated through the boundary condition settings of the model, and a skin temperature prediction model is established.

[0100] The following is an example of the design of electric heating clothing based on the heat transfer simulation method for electric heating clothing provided in this application:

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

[0102] For the simulation of electric heating clothing with a heating plate size of 9.5cm*5cm, a temperature prediction model of the heating part temperature of the inner layer of the electric heating clothing combination layer, the air layer thickness, the heating temperature and other parameters is established to guide the setting of the heating temperature boundary conditions under the corresponding parameter conditions in the heat transfer model of the electric heating clothing.

[0103] The orthogonal design method was used to design the fabric simulation experiment, with the average air layer thickness between the underwear layer and the skin layer , Average air layer thickness of the electric heating clothing combination layer and the underwear layer , Heating temperature , Ambient temperature , Human Power , Thermal resistance of electric heating clothing layer is the independent variable, and the actual temperature of the inner layer of the electric heating clothing combination layer is (℃) is the dependent variable for the simulation experiment, in which each research parameter is divided into 12 levels. The simulation results are shown in Table 3. The regression analysis method is used to analyze the experimental results 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 heated part of the inner layer of the electric heating clothing layer when the heating plate is heated:

[0104] (1)

[0105] in, (mm) is the average air layer thickness between the underwear layer and the skin layer. (mm) is the average air layer thickness between the electric heating clothing combination layer and the underwear layer, 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 ℃ ·W -1 ), is the heating temperature (℃). Goodness of fit of the equation The value is 0.9869, indicating that the model has good fitting.

[0106] Table 3 Simulation results of actual temperature of the inner layer of the electrically heated clothing combination layer

[0107]

[0108] The above temperature prediction model is used to determine the setting of the heating temperature boundary conditions of the heating part under the corresponding parameter conditions of the electric heating clothing heat transfer model. For example, the thickness of the air layer under the clothes corresponding to the heating part in the electric heating clothing heat transfer model, the ambient temperature, the human body power and other parameters are input into the temperature prediction model to obtain the actual temperature value of the inner layer of the electric heating clothing combination layer, which is used to set the temperature of the heating part in the electric heating clothing heat transfer model. The skin temperature of various parts of the human body is obtained through clothing simulation, so as to evaluate the thermal comfort of the electric heating clothing or optimize the design of the electric heating clothing. This temperature prediction model will help improve the simulation accuracy and convenience of clothing simulation design.

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

[0110] Taking the back of the garment as the research part, the midpoint of the heating plate position was moved in the longitudinal and transverse positions respectively. The average skin temperature of the upper body (including the upper torso, head, arms and hands), the average skin temperature of the upper torso and the average skin temperature of the back were obtained through simulation calculation when heating at each position point, and the position point with the best heating effect was selected. The simulation experiment set the ambient temperature to -10℃, the heating temperature to 45℃, and the human body power to 70W / m 2 (Human body static standing power). By referring to the size of the heating sheet in the existing heating component fabric and combining the shape of the human back, the heating sheet is designed as a vertical rectangle with a length and width of 9.5cm×5cm in the research on the position of the heating sheet, and the distance between the midpoint of the heating sheet and the midline of the human body is 5cm. In order to determine the optimal heating position of the heating sheet in the longitudinal direction of the back, the heating sheet is heated at different longitudinal positions of the back. For the convenience of geometric modeling, a longitudinal movement "track" 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 of the electric heating clothing heat transfer simulation method in an embodiment of the present invention under an embodiment, where the dot is the geometric midpoint of the heating sheet. The midpoint height h (cm) of the heating sheet is taken as a variable, and the height value h represents the height of the midpoint of the heating sheet from the bottom edge of the clothing. The height range is set to 15~55cm, and the moving step length is 2cm. Among them, the lowest point position (h=15cm) and the highest point position (h=55cm) of the heating sheet.

[0111] First, the air layer under the clothes at each heating position in the electric heating clothing heat transfer model was measured to obtain the average air layer thickness d1 (mm) between the 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 the air layer thickness was imported 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 layer was obtained through simulation calculation of the electric heating fabric system heat transfer model. (℃).

[0112] The midpoint height h and the corresponding Matching is performed, and a steady-state simulation of a specified combination is performed in the electric heating clothing heat transfer model to obtain the average temperature of the upper torso and the average temperature of the back. A total of 21 sets of clothing steady-state simulations were performed. In order to analyze the temperature data at different heights, a double y-axis line graph was drawn 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 the figure. Figure 7 As shown, Figure 7 A temperature-back height line graph of a heat transfer simulation method for electric heating clothing provided by the present invention in one embodiment. Figure 7 It can be seen that when the heating plate height is 55cm, the upper torso skin temperature is the highest and the heating effect is the best, followed by 47cm height. When the heating height is 55cm, the heating part is the shoulder, and the air layer under the clothes is small, so the heating effect is good, but the small air layer is also prone to cause local over-temperature. Considering that the back of the human body is heated more evenly, the heating plate height of 47cm is selected.

[0113] FIG6 (b) is a schematic diagram of the lateral displacement of the back of the heating plate in an example of the heat transfer simulation method of the electric heating clothing in an embodiment of the present invention. Since the optimal position selection process for the lateral movement of the heating plate is similar to the optimal position selection process for the longitudinal movement, it is not repeated in this embodiment. The optimal position for the lateral movement of the heating plate is finally obtained as follows: the distance between the geometric midpoint of the heating plate and the vertical midline of the electric heating clothing (the symmetry line of the human body) (i.e., the lateral distance L in FIG6 (b)) is 10.5 cm.

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

[0115] Example 3: Specific implementation method for the simulation design of the aspect ratio of the rectangular heating sheet on the back of the electric heating suit based on the established model group and the heat transfer simulation method of the electric heating suit:

[0116] The heating plate area is 47.5cm 2, the midpoint position of the rectangular heating plate remains unchanged, and on this basis, the length-to-width ratio of the heating plate is changed, and a total of 7 length-to-width ratios (4 / 1, 3 / 1, 2 / 1, 1 / 1, 1 / 2, 1 / 3, 1 / 4) are selected for model simulation calculation. First, the air layer under the clothes of the heating plates with different length-to-width ratios in the electric heating clothing heat transfer model is measured respectively, and 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 are obtained. After the average air layer thickness d1 and d2 are imported 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 combination layer is obtained by simulating and calculating the electric heating fabric system heat transfer model. (℃). In the heat transfer model of electric heating clothing, heating plates with different length-to-width ratios are connected to the corresponding After 7 steady-state simulations, the average upper body temperature and the average back temperature of the human body were obtained, and the upper body temperature and back temperature line graphs of the heating sheets with different aspect ratios were drawn, as shown in Figure 8 As shown in the figure, and the corresponding human back surface temperature cloud diagram, as shown in the figure Fig. 9 When r is 2 / 1 and 1 / 2, the upper body temperature is not much different; 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 the heating effect of the vertical heating plate (higher than wide) is better than that of the horizontal heating plate (wider than high) at this heating position. The reason may be that the back shape is higher than the back width, so the vertical heating plate is more conducive to the uniform diffusion of heat on the back. Figure 8 It can be seen from the temperature line graph that the skin temperature is highest when the aspect ratio r of the heating plate is 3 / 1, that is, the heating effect of the heating plate with this aspect ratio is best at this position.

[0117] It should be noted that, since the aspect ratio of the heating plate affects the heat transfer of human body parts such as arms and armpits, Example 3 measures the average temperature of the upper body including the temperature of the human arm as an evaluation indicator.

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

[0119] On the basis that the back heating position and the length-to-width ratio of the heating plate have been determined, the model is parametrically simulated by comprehensively considering the influence of environmental factors (ambient temperature), human factors (human metabolic power), clothing factors (thermal resistance of clothing outer fabric) and heating plates (heating area, heating temperature) on the heat transfer performance of the electric heating clothing. For the research on the heating plate, the influence of the heating plate area parameters and the heating temperature parameters will be added on the basis of the determined heating position and the length-to-width ratio of the heating plate. Based on Example 3, the length-to-width ratio of the heating plate for back heating is selected as 3 / 1, and the heating plate area will use the heating plate width c (cm) as an indicator. The length (height) of the heating plate is 3*c respectively, and the heating plate area is 3*c 2 .

[0120] The orthogonal design method was used to design the fabric simulation and clothing simulation experiments, and each research parameter was divided into 5 levels. First, the average air layer thickness of the underwear layer and skin layer, the electric heating clothing layer and the underwear layer at the heating part under different heating plate sizes was measured to obtain the air layer thickness d1 and d2 values. The d1 and d2 values ​​were substituted into the heat transfer model of the electric heating fabric system, and the actual temperature of the heating part of the inner layer of the electric heating clothing combination layer under the corresponding experimental conditions was obtained through simulation calculation. The test results are shown in Table 3. The actual temperature of the inner layer of the electric heating clothing combination layer and other test factor values ​​are substituted into the electric heating clothing heat transfer model for simulation calculation, and the results are shown in Table 4.

[0121] Table 4 Simulation results of heat transfer model of electric heating fabric system

[0122]

[0123] The test results were analyzed by regression analysis method to determine the mathematical relationship between skin temperature and influencing factors, so as to establish a skin temperature prediction model when the electric heating clothing is heated.

[0124] In the heat transfer model of the electric heating fabric system, various test parameters and the thickness of the air layer under the corresponding heating plate are set, and the actual temperature of the inner layer of the electric heating clothing combination layer is obtained through simulation calculation. (℃). , Human Power , Thermal resistance of combined layers of electric heating clothing , Heating temperature , Heating plate width ) as the independent variable, the actual temperature of the inner layer of the electrically heated clothing combination layer The actual temperature of the inner layer of the back-heating electric heating clothing combination layer is obtained by multivariate linear fitting as the dependent variable. (℃) The fitting equation is as follows:

[0125] (2)

[0126] in, 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 ℃ ·W -1 ), is the heating temperature (°C), is the width of the heating plate (cm). The model passed the F test (p value < 0.05), and the goodness of fit of the fitting equation was obtained. It is 0.999, indicating that the model is meaningful and has good goodness of fit.

[0127] The actual temperature of the inner layer of the electric heating clothing combination layer corresponding to the 25 test conditions obtained by fabric simulation Substitute the heat transfer model of electric heating clothing into the clothing simulation to obtain the skin temperature of the heated area under the corresponding parameter conditions , back skin temperature , upper trunk skin temperature and upper body skin temperature With skin temperature as the dependent variable, ambient temperature Ta, human body power q, thermal resistance of the electric heating clothing combination layer R, actual temperature Th' of the inner layer of the electric heating clothing combination layer with back heating, and heating plate width c as independent variables, the fitting equation group of skin temperature of each part under the condition of back heating was obtained through multivariate linear fitting:

[0128] (3)

[0129] (4)

[0130] (5)

[0131] (6)

[0132] The equations all passed the F test (p value < 0.05), and the goodness of fit of each fitting equation All of them are greater than 0.99, indicating that the model is meaningful and has a good fit.

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

[0134]

[0135] The skin temperature prediction model is applied as follows:

[0136] When all factors are known, the human skin temperature is calculated and predicted, so as to evaluate the thermal performance of the electric heating clothing.

[0137] The heating temperature range and heating plate size of the electric heating suit are set according to the ambient temperature or human activity (human metabolic power). When the human skin temperature is higher than 41°C, the human body will feel heat pain, so it is recommended to set the skin temperature of the heated part to Should be less than 41 ℃. Embodiment 2

[0138] This embodiment provides a heat transfer simulation system for electric heating clothing, including:

[0139] The first building module is used to establish a heat transfer model of electric heating clothing and a heat transfer model of electric heating fabric system based on fluid dynamics;

[0140] Combined application module: used to establish a combined application method for heat transfer models of electric heating clothing and electric heating fabric system;

[0141] Verification module: used to conduct verification experiments 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 building module is used to establish a temperature prediction model based on the heat transfer model of the electric heating clothing and the heat transfer model of the electric heating fabric system through the verification experiment, and the combined application method, 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;

[0143] 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. Embodiment 3

[0144] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the heat transfer simulation method for electric heating clothing in Embodiment 1 are implemented. Embodiment 4

[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 heat transfer simulation method for electric heating clothing described in the first embodiment are implemented.

[0146] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt 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 codes. The schemes in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

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

[0148] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0150] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0151] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the 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; Step S2: establishing a combined application method of a heat transfer model of electric heating clothing and a heat transfer model of an electric heating fabric system; 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 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 plate. The constructed human body geometric model and the double-layer clothing geometric model are imported into simulation software to construct an electric heating clothing heat transfer model.

3. The heat transfer simulation method of electric heating clothing according to claim 2, characterized in that: 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.

4. The heat transfer simulation method of electric heating clothing according to claim 3, characterized in that: The combined application method of establishing the heat transfer model of the electric heating clothing and the heat transfer model of the electric heating fabric system in step S2 includes: 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.

5. The heat transfer simulation method of electric heating clothing according to claim 3, 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.

6. The heat transfer simulation method of electric heating clothing according to claim 4, 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.

7. The heat transfer simulation method of electric heating clothing according to claim 4, 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.

8. The heat transfer simulation method of electric heating clothing according to claim 7, 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: 。 9. 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 8 are implemented.

10. 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 8 are implemented.

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