Multivariable dynamic fabric heat transfer performance testing system and method

Abstract

The invention discloses a multivariable dynamic fabric heat transfer performance testing system and method.The multivariable dynamic fabric heat transfer performance testing system comprises a testing box body, a heat dissipation and moisture preservation box, a switch control integrator, a temperature adjusting system, a humidity adjusting system and a wind speed adjusting system; the heat dissipation and heat preservation box surrounds the test box body, an internal containing space is formed in the heat dissipation and heat preservation box, the temperature adjusting system comprises a microcomputer heating table, the microcomputer heating table is located in the internal containing space, a fabric sample is borne on the microcomputer heating table, and the microcomputer heating table is used for heating the fabric sample; the switch control integrator is used for controlling the temperature adjusting system, the humidity adjusting system and the wind speed adjusting system so as to adjust the box body temperature, the box body humidity and the box body wind speed of the test box body. According to the invention, a single-factor and multi-factor interaction complex environment can be simulated, a test scene is close to an actual use condition, and the fabric test precision can be improved.

Description

Technical Field

[0001] This application relates to the field of textile technology, specifically to a multivariable dynamic fabric heat transfer performance testing system and method. Background Technology

[0002] With the increasing sophistication of nonwoven material production processes, improved living standards, and heightened awareness of protection, there are diverse demands for the thermal insulation performance of nonwovens in various fields, including everyday clothing, building insulation and flame retardancy, medical constant temperature therapy, and special thermal insulation protection. This has led to the gradual development of thermal insulation nonwoven materials. Different fields have varying requirements for the heat transfer characteristics of thermal insulation nonwoven materials. However, existing fabric performance testing systems operate in a limited environment, resulting in low testing accuracy. Summary of the Invention

[0003] This application provides a multivariable dynamic fabric heat transfer performance testing system and method, which can improve the accuracy of fabric testing.

[0004] In the first aspect, the multivariable dynamic fabric heat transfer performance testing system provided in this application includes a test chamber, a heat dissipation and humidity control chamber, a switch control integrator, a temperature control system, a humidity control system, and a wind speed control system. The heat dissipation and insulation box surrounds the test chamber, and the heat dissipation and insulation box has an internal receiving space. The temperature regulation system includes a microcomputer heating stage, which is located in the internal receiving space. The microcomputer heating stage carries a fabric sample and is used to heat the fabric sample. The switch control integrator is used to control the temperature regulation system, humidity regulation system and wind speed regulation system to adjust the chamber temperature, chamber humidity and chamber wind speed of the test chamber.

[0005] Optionally, the temperature control system includes an ambient heat dissipation component, a semiconductor cooler, and an active heat dissipation component; The semiconductor cooler is embedded in the top wall of the test chamber, the active heat dissipation component is provided on the outer wall of the heat dissipation and humidity chamber, and the environmental heat dissipation component is located outside the heat dissipation and humidity chamber; The switch control integrator is equipped with a temperature control module, which is connected to the semiconductor cooler, the microcomputer heating stage, and the environmental heat dissipation component, and controls the switching of the semiconductor cooler, the microcomputer heating stage, and the environmental heat dissipation component to control the temperature of the fabric sample.

[0006] Optionally, the microcomputer heating platform is equipped with a platform temperature sensor for detecting the platform temperature, and the test chamber is equipped with a chamber temperature sensor for detecting the chamber temperature within the internal containment space. The temperature control module controls the on / off switch of the microcomputer heating platform to keep the platform temperature within a preset temperature range. The temperature control module also controls the on / off switch of the ambient heat dissipation components to maintain the chamber temperature between 15 and 25 degrees Celsius. When the temperature detected by the chamber temperature sensor is higher than 21 degrees Celsius, the temperature control module activates the cooling mode of the semiconductor cooler; when the temperature detected by the chamber temperature sensor is lower than 19 degrees Celsius, the temperature control module deactivates the cooling mode of the semiconductor cooler.

[0007] Optionally, the environmental heat dissipation component is an air conditioner, the test chamber is made of copper, the outer wall of the heat dissipation and humidity chamber is provided with heat dissipation aluminum fins, and the air outlet of the air conditioner is oriented towards the heat dissipation aluminum fins.

[0008] Optionally, the sidewall of the test chamber is a hollow cavity sidewall, and multiple hollow cavity sidewalls enclose the internal receiving space within the test chamber. The humidity control system includes a desiccant, a humidifier, and a humidity sensor. The desiccant and the humidifier are located within the hollow cavity sidewall, and the humidity sensor is located within the internal receiving space. The desiccant is used to absorb moisture from the test chamber, and the humidifier is used to humidify the test chamber. The switch control integrator is equipped with a humidity control module. The humidity control module obtains the humidity of the chamber through the humidity sensor and controls the switch of the humidifier according to the humidity of the chamber to adjust the humidity of the chamber inside the test chamber.

[0009] Optionally, the wind speed regulation system includes a fan, a wind speed detector, a rectifier mesh, and a hollow plate; the test chamber has holes on the left and right sides, and the fan, rectifier mesh, and hollow plate are installed in sequence at the holes; the wind speed detector is used to detect the wind speed on the table above the microcomputer heating table. The switch control integrator is equipped with a wind control module. The wind control module obtains the wind speed on the table through the wind speed detector and controls the switch of the humidifier according to the wind speed on the table to adjust the wind speed on the table inside the test chamber.

[0010] Optionally, the heat dissipation and humidity control chamber is equipped with a heat flux sensor, which is used to detect the heat transfer flux of the fabric sample.

[0011] Secondly, the multivariable dynamic fabric heat transfer performance index testing method provided in this application is applied to a multivariable dynamic fabric heat transfer performance testing system. The multivariable dynamic fabric heat transfer performance testing system includes a test chamber, a heat dissipation and humidity control chamber, a switch control integrator, a temperature control system, a humidity control system, and a wind speed control system. The heat dissipation and humidity control chamber surrounds the test chamber, and an internal receiving space is provided inside the heat dissipation and humidity control chamber. The temperature control system includes a microcomputer heating stage located in the internal receiving space, on which a fabric sample is placed. The microcomputer heating stage is used to heat the fabric sample. The switch control integrator is used to control the temperature control system, humidity control system, and wind speed control system to adjust the chamber temperature, chamber humidity, and chamber wind speed of the test chamber. The multivariable dynamic fabric heat transfer performance testing method includes: The pretreated fabric sample is placed on the microcomputer heating stage in the test chamber. The temperature regulation system, humidity regulation system, and wind speed regulation system are controlled by a switch control integrator to adjust the chamber temperature, chamber humidity, and chamber wind speed of the test chamber to the target chamber temperature, target chamber humidity, and target chamber wind speed. The heat transfer performance indicators of the fabric sample are collected using the detection module.

[0012] Optionally, placing the pretreated fabric sample onto the microcomputer-controlled heating stage in the test chamber includes: The fabric sample was cut into 16mm×16mm sizes, dried in an oven at 80-120℃ for 6 hours, and weighed as the initial weight. The fabric sample was left to stand for 24 hours in a humidity environment of 20±1℃, then wrapped with double-layer heat-insulating tape and placed in the microcomputer heating stage in the test chamber for 2 hours.

[0013] Optionally, the step of controlling the temperature regulation system, the humidity regulation system, and the wind speed regulation system via a switch control integrator to adjust the chamber temperature, chamber humidity, and chamber wind speed of the test chamber to target chamber temperature, target chamber humidity, and target chamber wind speed includes: Obtain the target chamber temperature and the preset temperature transfer function expression; The set temperature is determined based on the temperature transfer function expression and the target chamber temperature; The set temperature is input into the temperature control system so that the temperature control system adjusts the chamber temperature of the test chamber to the target chamber temperature.

[0014] In this application, compared to related technologies, the multivariable dynamic fabric heat transfer performance testing system includes a test chamber, a heat dissipation and humidity control chamber, a switch control integrator, a temperature control system, a humidity control system, and a wind speed control system. The heat dissipation and humidity control chamber surrounds the test chamber, and an internal receiving space is provided inside the heat dissipation and humidity control chamber. The temperature control system includes a microcomputer heating stage located in the internal receiving space, on which a fabric sample is placed. The microcomputer heating stage is used to heat the fabric sample. The switch control integrator is used to control the temperature control system, humidity control system, and wind speed control system to adjust the chamber temperature, chamber humidity, and chamber wind speed of the test chamber. This application can simulate complex environments with single-factor and multi-factor interactions, and the test scenario is close to actual use conditions, which can improve the accuracy of fabric testing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1a This is a schematic diagram of one embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 1b This is a schematic diagram of the structure of one embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 2 ; Figure 1c This is a structural cross-sectional view of an embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 2 This is a schematic diagram of the structure of one embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 3 ; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a top view of the multivariable dynamic fabric heat transfer performance testing system provided in the embodiments of this application; Figure 5 This is a schematic diagram of the heat dissipation and humidification chamber structure of the multivariable dynamic fabric heat transfer performance testing system provided in this application embodiment; Figure 6 This is a schematic diagram of the test chamber structure of the multivariable dynamic fabric heat transfer performance testing system provided in the embodiments of this application; Figure 7This is a flowchart illustrating one embodiment of the multivariable dynamic fabric heat transfer performance testing method provided in this application. Figure 8 This is a flowchart illustrating one embodiment of the multivariable dynamic fabric heat transfer performance testing method provided in this application. Figure 9 This is a schematic diagram of the temperature control system in one embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 10 This is a schematic diagram of the humidity control system in one embodiment of the multivariable dynamic fabric heat transfer performance testing system provided in this application. Figure 11 This is a schematic diagram of the implementation state of the multivariable dynamic fabric heat transfer performance testing system provided in this application embodiment; Figure 12 This is a schematic diagram of the implementation status of the multivariable dynamic fabric heat transfer performance testing system provided in this application embodiment. Figure 2 ; Figure 13 This is a schematic diagram of the implementation status of the multivariable dynamic fabric heat transfer performance testing system provided in this application embodiment. Figure 3 . Detailed Implementation

[0017] It should be noted that the principles of this application are illustrated by example in a suitable computing environment. The following description is based on the specific embodiments of this application that are illustrated, and should not be regarded as limiting other specific embodiments not detailed herein.

[0018] In the following description of this application, "some embodiments" are referred to, which describe a subset of all possible embodiments. However, it is understood that "some embodiments" may be the same subset or different subset of all possible embodiments, and may be combined with each other without conflict.

[0019] In the following description of this application, the terms "first, second, third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0021] While the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] In the embodiments described in this application, references to "one embodiment" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0023] In the embodiments of this application, the terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0024] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0025] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In the embodiments of this application, the directional terms mentioned, such as "up", "down", "left", "right", "inner", and "outer", are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0027] Please refer to Figure 1 to... Figure 6In this embodiment of the application, the multivariable dynamic fabric heat transfer performance testing system includes a test chamber 11, a heat dissipation and humidity control chamber 12, a switch control integrator 13, a temperature control system, a humidity control system, and a wind speed control system.

[0028] In this embodiment, the heat dissipation and humidity control box 12 surrounds the test chamber 11. The heat dissipation and humidity control box 12 and the test chamber 11 can be placed on a movable mobile platform 10 to facilitate their movement. It should be understood that the mobile platform 10 can be moved by installing casters at the bottom of the mobile platform 10, or by other means. This application will not elaborate on these methods. The heat dissipation and humidity control box 12 has an internal storage space. The temperature control system includes a microcomputer heating stage 141, which is located in the internal storage space. The microcomputer heating stage 141 carries a fabric sample 19 and is used to heat the fabric sample 19. The switch control integrator 13 is used to control the temperature control system, humidity control system, and wind speed control system to adjust the chamber temperature, humidity, and wind speed of the test chamber 11.

[0029] In this embodiment, the temperature control system includes an ambient heat dissipation component 142, a semiconductor cooler 143, an active heat dissipation component 144, and a temperature control pipe 145. The active heat dissipation component 144 can be a fan. The temperature control pipe 145 is disposed on the inner wall of the test chamber 11 to regulate the temperature inside the test chamber 11. When the temperature inside the test chamber 11 is too high, cold water can be introduced into the temperature control pipe 145 to lower the temperature inside the test chamber 11. When the temperature inside the test chamber 11 is too low, hot water can be introduced into the temperature control pipe 145 to raise the temperature inside the test chamber 11. In summary, by introducing cold or hot water into the temperature control pipe 145, the temperature of the test chamber 11 can be controlled by the temperature control pipe 145, so that the temperature inside the test chamber 11 is always within a suitable range.

[0030] The semiconductor cooler 143 is embedded in the top wall of the test chamber 11. A guide plate 1431 is fixedly provided on the side of the test chamber 11 facing away from the top wall so that when the semiconductor cooler 143 is working, the condensate that appears on the side of the test chamber 11 facing away from the top wall due to the operation of the semiconductor cooler 143 can be collected by the guide plate 1431 and flow out of the interior of the test chamber 11 along the guide plate 1431. The outer wall of the heat dissipation and humidity chamber 12 is provided with an active heat dissipation component 144, and the ambient heat dissipation component 142 is located outside the heat dissipation and humidity chamber 12.

[0031] The switch control integrator 13 is equipped with a temperature control module 131, which is connected to the semiconductor cooler 143, the microcomputer heating stage 141 and the ambient heat dissipation component 142 respectively, and controls the switching of the semiconductor cooler 143, the microcomputer heating stage 141 and the ambient heat dissipation component 142 to control the temperature of the fabric sample 19.

[0032] In this embodiment, a tabletop temperature sensor 171 is provided on the microcomputer heating stage 141 to detect the tabletop temperature of the microcomputer heating stage 141. A chamber temperature sensor 172 is provided inside the test chamber 11 to detect the chamber temperature in the internal storage space. The temperature control module 131 controls the on / off switch of the microcomputer heating stage 141 to keep the tabletop temperature within a preset temperature range. The temperature control module 131 controls the on / off switch of the ambient heat dissipation component 142 to keep the chamber temperature of the test chamber 11 between 15 degrees and 25 degrees. When the temperature detected by the chamber temperature sensor 172 is higher than 21 degrees Celsius, the temperature control module 131 turns on the cooling mode of the semiconductor cooler 143. When the temperature detected by the chamber temperature sensor 172 is lower than 19 degrees Celsius, the temperature control module 131 turns off the cooling mode of the semiconductor cooler 143.

[0033] The microcomputer-controlled heating table 141 heats to the specified temperature and dynamically monitors the table surface temperature. Heating begins when the table surface temperature is below the specified temperature and stops when it is above the specified temperature, with the temperature error controlled within ±1 degree Celsius.

[0034] The ambient temperature must be maintained at 20±5 degrees Celsius, and the temperature of the space where the air conditioning pre-adjustment device is located is used. To ensure the balance of local humidity and temperature near the test point, a test chamber 11 composed of acrylic sheet and aluminum foil is built near the microcomputer heating stage 141 for temperature and humidity control. The ambient temperature inside the chamber may rise due to the small space and poor heat dissipation. This is addressed by installing a semiconductor cooler, a temperature control switch, and a temperature sensor inside the chamber to achieve arbitrary temperature settings. The ambient temperature inside the chamber is monitored in real time by the temperature control switch and temperature sensor. When the temperature exceeds 21 degrees Celsius, the temperature control switch activates the semiconductor cooler to start cooling; when the ambient temperature drops below 19 degrees Celsius, the temperature control switch automatically shuts off the semiconductor cooler.

[0035] When testing the heating platform at 100-150 degrees Celsius, it's necessary to enhance the heat dissipation of the enclosure. Using copper for the enclosure allows for efficient heat transfer from the internal environment to the copper casing. Copper's excellent thermal conductivity enables rapid heat transfer to the preset 20-degree Celsius temperature environment within the equipment space. Since air's low thermal conductivity results in a slow rate of temperature change, aluminum foil and wire are used to create aluminum fins on the outside of the enclosure to increase the heat dissipation area. Furthermore, air conditioning is used to direct airflow towards the enclosure, increasing external convection heat transfer and achieving effective cooling.

[0036] In this embodiment, the environmental heat dissipation component 142 is an air conditioner, the test chamber 11 is made of copper, the outer wall of the heat dissipation and humidity chamber 12 is provided with heat dissipation aluminum fins 121, and the air outlet of the air conditioner is set towards the heat dissipation aluminum fins 121.

[0037] In this embodiment, the sidewall of the test chamber 11 is a hollow cavity sidewall, and multiple hollow cavity sidewalls enclose an internal receiving space within the test chamber 11. The humidity control system includes a desiccant 151, a humidifier 152, and a humidity sensor 153. The desiccant 151 and the humidifier 152 are located inside the hollow cavity sidewall, and the humidity sensor 153 is located inside the receiving space. The desiccant 151 is used to absorb moisture from the test chamber 11, and the humidifier 152 is used to humidify the test chamber 11. A humidity control module 132 is provided on the switch control integrator 13. The humidity control module 132 obtains the humidity of the chamber through the humidity sensor 153 and controls the switch of the humidifier 152 according to the humidity of the chamber to adjust the humidity inside the test chamber 11.

[0038] The humidity control system was established to analyze the heat transfer performance of fabrics under different humidity environments. This paper defines a parameter similar to fabric moisture regain, the fabric moisture absorption rate P, and records the initial humidity when the fabric's weight change rate during oven drying is less than 1%. Then record the weight of the fabric after 12 hours in environments with 5% humidity (basically dry), 40% humidity, 60% humidity, and 80% humidity. The moisture absorption rate of the fabric is: .

[0039] The humidity control system consists of lime, a humidifier, a humidity sensor, and a sealed chamber. Since the volume of the sealed chamber and the lime packaging are both quantitative, a quantitative supply of quicklime by weight can be provided to achieve different humidity environments. Because heat transfer testing takes a long time, and the moisture absorption effect of lime exhibits a convex decreasing function over time, moisture absorption is unstable and short-lived. Furthermore, humidification is easy, but moisture absorption is difficult. This application uses an excess of lime with a specified humidity level, evenly distributed in the sealed chamber, and places the humidity sensor probe and humidifier inside. The humidifier control panel sets the specified humidity, and the humidity sensor transmits the real-time humidity of the chamber. When the humidity is too low, the humidifier is activated. After multiple experimental analyses, when testing temperatures below 150℃, using a low-cost desiccant like lime is the optimal solution when dynamically coordinating the desiccant, humidifier, and humidity sensor. Otherwise, when testing higher temperatures, the reaction between the lime and the water vapor in the humidifier generates heat, leading to higher requirements for the chamber's ambient temperature balance and necessitating the installation of more cooling modules. This is also a limitation of this small constant temperature and humidity multi-factor dynamic testing chamber. In addition, desiccants such as lime and activated carbon have extremely weak moisture absorption properties below 30% humidity.

[0040] In this embodiment, the wind speed adjustment system includes a fan 161, a wind speed detector 162, a rectifier mesh 163, and a hollow plate. Holes are provided on the left and right sides of the test chamber 11. The fan 161, the rectifier mesh 163, and the hollow plate are installed in sequence at the holes. The wind speed detector 162 is used to detect the wind speed on the table above the microcomputer heating table 141. A wind control module 133 is provided on the switch control integrator 13. The wind control module 133 obtains the wind speed on the table through the wind speed detector 162 and controls the switch of the humidifier 152 according to the wind speed on the table to adjust the wind speed on the table inside the test chamber 11.

[0041] In this embodiment, a heat dissipation and humidity control box 12 is provided with a heat flux sensor 122, which is used to detect the heat transfer flux of the fabric sample 19.

[0042] In this embodiment, a computer 124 is provided on the heat dissipation and humidity control box 12, and the computer 124 interacts with the switch control integrator 13. A pressure block 123 is provided on the switch control integrator 13.

[0043] like Figure 4 As shown, this application also provides a method for testing multivariate dynamic fabric heat transfer performance indicators. The method for testing multivariate dynamic fabric heat transfer performance includes: 101. After pretreatment, place the fabric sample on the microcomputer heating stage in the test chamber.

[0044] like Figure 5 As shown, in a specific embodiment, the pre-treated fabric sample is placed on the microcomputer heating stage in the test chamber, including: cutting the fabric sample into 16mm×16mm specifications, drying it in an oven at 80-120℃ for 6 hours, weighing it and recording it as the initial weight; letting it stand in a humidity environment of 20±1℃ for 24 hours, wrapping the fabric sample 19 with double-layer heat insulation tape, sealing the edges, labeling it, and then placing it in the microcomputer heating stage 141 in the test chamber 11 for 2 hours.

[0045] In this embodiment, the fabric sample is a polyimide nanofiber membrane and a polyimide needle-punched nonwoven fabric. First, the sample is pretreated. Since the heating platform is 15×15mm, the sample needs to be cut to 16mm×16mm to reduce edge heat loss. When testing experimental data for a batch or under certain environmental conditions, three samples from the same fabric source are taken and subjected to the same experimental procedure, with the average value used as the final experimental data. Subsequently, the sample is placed in an oven at 80~120℃ for 6 hours to dry. Before removing the sample, an electronic scale, a plastic bag, and labels are prepared in advance. The dried sample is immediately weighed and recorded as the initial weight m0. Each sample is then labeled and quickly placed into a plastic bag. The bagged sample is transported to a basic experimental environment with measured humidity and 20±1℃ and left to stand for 24 hours. Double-layer heat-insulating tape (heat-insulating aluminum tape-polyimide tape) is used to wrap the sample to reduce edge heat loss.

[0046] 102. The temperature regulation system, humidity regulation system and wind speed regulation system are controlled by the switch control integrator to adjust the chamber temperature, chamber humidity and chamber wind speed of the test chamber to the target chamber temperature, target chamber humidity and target chamber wind speed.

[0047] In this embodiment, a switch control integrator controls a temperature regulation system, a humidity regulation system, and a wind speed regulation system to adjust the chamber temperature, humidity, and wind speed of the test chamber to the target chamber temperature, humidity, and wind speed. This includes: obtaining the target chamber temperature and a preset temperature transfer function expression; determining a set temperature based on the temperature transfer function expression and the target chamber temperature; and inputting the set temperature into the temperature regulation system so that the temperature regulation system adjusts the chamber temperature of the test chamber to the target chamber temperature.

[0048] like Figure 6 As shown, Figure 6 This is a schematic diagram of a temperature control system. Figure 6 In this configuration, the microcomputer-controlled heating platform 141 is controlled by a heating platform controller. Sensor H1 is a platform temperature sensor 171, used to detect the surface temperature of the microcomputer-controlled heating platform 141. Sensor H2 is a cabinet temperature sensor 172, used to detect the cabinet temperature within the internal storage space. The actual cabinet temperature is... T box The temperature of the enclosure collected by sensor H2 is T refThe temperature control module 131 controls the on / off switch of the microcomputer heating platform 141 via the heating platform controller to keep the platform temperature within a preset temperature range. The temperature control module 131 also controls the on / off switch of the ambient heat dissipation component 142 via the air conditioning controller to maintain the chamber temperature of the test chamber 11 between 15 and 25 degrees Celsius. The temperature control module 131 monitors the temperature detected by the chamber temperature sensor 172. T ref When the temperature exceeds 21 degrees Celsius, the thermoelectric cooler 143 is activated in cooling mode via a temperature control switch. The temperature control module 131 controls the temperature detected by the cabinet temperature sensor 172. T ref When the temperature is below 19 degrees Celsius, the cooling mode of the semiconductor cooler 143 is turned off by the temperature control switch. The temperature control module 131 controls the on / off switch of the active heat dissipation component 144 (which can be a fan) through the heat dissipation controller to keep the chamber temperature of the test chamber 11 between 15 and 25 degrees Celsius.

[0049] The preset temperature transfer function expression is shown in the following formula. in, s, Laplace complex frequency domain variable; G total ( s ) = T box ( s ) / T set ( s The overall closed-loop transfer function of the system; T set ( s ), T platform ( s ), T box ( s ), which are the Laplace transforms of the set temperature, tabletop temperature, and cabinet temperature, respectively; G c ( s ), G h ( s ), which are the transfer functions for the heating table controller and the controlled object, respectively; H 1( s ), H 2( s ), the transfer function of the temperature measurement / sampling process; G platform ( s )= G c ( s ) G h ( s) / [1+ G h ( s ) G c ( s ) H 1( s The equivalent transfer function of the heating stage closed loop from the set point to the stage surface temperature; α Unit: W / K, thermal coupling coefficient between platform and enclosure; ρ Unit: J / K, equivalent heat capacity of the box (density ρ, specific heat at constant pressure c, effective volume Vs); K cooling ( s ) = K ac ( s ) + K tec ( s ) + K fin ( s The sum of the equivalent thermal conductance / admittance of the external heat dissipation channels; K ac ( s Equivalent thermal conductivity of the air conditioning / environmental heat exchange branch; K tec ( s Equivalent thermal conductivity of the TEC cooling branch; K fin ( s The equivalent thermal conductivity of the heatsink and fan branch is as follows:

[0050] In this embodiment, a switch control integrator controls a temperature regulation system, a humidity regulation system, and a wind speed regulation system to adjust the chamber temperature, humidity, and wind speed of the test chamber to the target chamber temperature, humidity, and wind speed. This includes: obtaining the target chamber humidity and a preset humidity transfer function expression; determining a set humidity based on the humidity transfer function expression and the target chamber humidity; and inputting the set humidity into the humidity regulation system so that the humidity regulation system adjusts the chamber humidity of the test chamber to the target chamber humidity.

[0051] like Figure 7 As shown, Figure 7 This is a schematic diagram of a humidity control system. Figure 7In this test chamber 11, the humidifier 152 is controlled by a humidity controller, and the sealed enclosure is the side wall of the hollow cavity. The desiccant 151 and humidifier 152 are located inside the side wall of the hollow cavity, and the humidity sensor 153 is located within the internal storage space. The desiccant 151 is used to absorb moisture from the test chamber 11, and the humidifier 152 is used to humidify the test chamber 11. A humidity control module 132 is provided on the switch control integrator 13, which acquires the humidity of the chamber through the humidity sensor 153. H box And according to the humidity of the box H box Set humidity H set The switch of the humidifier 152 is controlled to adjust the humidity inside the test chamber 11.

[0052] The preset humidity transfer function expression is shown in the following formula. .

[0053] in, H set ( s Set the Laplace transform of humidity; H box ( s Laplace transform of humidity in the enclosure; G c ( s The transfer function of the humidity controller; G h ( s ), the transfer function of the humidifier / actuator from the control quantity to the change in humidification flow rate / humidity inside the chamber; H s ( s ), the transfer function of the humidity sensor / sampling circuit; V box s It is the integral characteristic of the sealed box volume, representing the inertia of humidity changes; G lime ( s The exponential decay characteristic of lime hygroscopic absorption, where, G lime ( s )= K 0 τ / ( sτ +1), K 0 represents the hygroscopic intensity, and τ represents the hygroscopic kinetic time constant.

[0054] In this embodiment, a temperature control system, a humidity control system, and a wind speed control system are controlled by a switch control integrator to adjust the chamber temperature, humidity, and wind speed of the test chamber to the target chamber temperature, humidity, and wind speed. This includes: obtaining the target chamber wind speed and a preset wind speed transfer function expression; determining a set wind speed based on the wind speed transfer function expression and the target chamber wind speed; and inputting the set wind speed into the wind speed control system so that the wind speed control system adjusts the chamber wind speed of the test chamber to the target chamber wind speed.

[0055] The wind speed regulation system consists of a distillation mesh, a hollow plate, a fan, a wind speed regulator, and an anemometer. The heat dissipation and humidity control box was modified by creating openings on both sides. The fan, wind speed regulator, rectifier mesh, and hollow plate were placed sequentially in the left-side opening. Before testing, the anemometer was used to adjust the wind speed above the heating test platform. Then, nonwoven fabric and a platform temperature sensor were placed in sequence to conduct temperature tests under different wind speeds. The addition of the wind speed regulation system and pressure module allows for the measurement of the nonwoven fabric's thermal properties under complex interactive environments such as wind-heat, pressure-heat, humidity-heat, wind-heat-pressure, and wind-humidity-heat.

[0056] 103. Collect the heat transfer performance indicators of the fabric sample through the detection module.

[0057] Heat transfer performance indicators can include heat flux, fabric moisture absorption rate (P), etc.

[0058] Compared to related technologies, the multivariable dynamic fabric heat transfer performance testing system includes a test chamber, a heat dissipation and humidity control chamber, a switch control integrator, a temperature control system, a humidity control system, and a wind speed control system. The heat dissipation and humidity control chamber surrounds the test chamber and has an internal storage space. The temperature control system includes a microcomputer heating stage located within the internal storage space, on which the fabric sample is placed and heated. The switch control integrator controls the temperature control system, humidity control system, and wind speed control system to adjust the chamber temperature, humidity, and wind speed. This application can simulate complex environments with single-factor and multi-factor interactions, and the test scenario closely resembles actual operating conditions, thus improving the accuracy of fabric testing.

[0059] The above provides a detailed description of the multivariable dynamic fabric heat transfer performance testing system and method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0060] It should be noted that when the above embodiments of this application are applied to specific products or technologies, and user-related data is involved, user permission or consent is required, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

Claims

1. A multi-variable dynamic fabric heat transfer performance testing system, characterized in that, The multivariable dynamic fabric heat transfer performance test system comprises a test box, a heat dissipation and moisture preservation box, a switch control integrator, a temperature regulation system, a humidity regulation system and a wind speed regulation system; The heat dissipation and moisture preservation box surrounds the test box, and an internal accommodation space is formed in the heat dissipation and moisture preservation box; the temperature regulation system comprises a microcomputer heating table, the microcomputer heating table is located in the internal accommodation space, and a fabric sample is loaded on the microcomputer heating table; the microcomputer heating table is used for heating the fabric sample; The switch control integrator is used for controlling the temperature regulation system, the humidity regulation system and the wind speed regulation system to regulate the box temperature, the box humidity and the box wind speed of the test box.

2. The multi-variable dynamic fabric heat transfer performance testing system of claim 1, wherein, The temperature regulation system comprises an environmental heat dissipation component, a semiconductor refrigerator and an active heat dissipation component; The semiconductor refrigerator is embedded in the top wall of the test box, the active heat dissipation component is arranged on the outer wall of the heat dissipation and moisture preservation box, and the environmental heat dissipation component is located outside the heat dissipation and moisture preservation box; A temperature control module is arranged on the switch control integrator, the temperature control module is connected with the semiconductor refrigerator, the microcomputer heating table and the environmental heat dissipation component, and the temperature control module controls the switch of the semiconductor refrigerator, the microcomputer heating table and the environmental heat dissipation component to control the temperature of the fabric sample.

3. The multi-variable dynamic fabric heat transfer performance testing system of claim 2, wherein, A table top temperature sensor is arranged on the microcomputer heating table, the table top temperature sensor is used for detecting the table top temperature of the microcomputer heating table, a box temperature sensor is arranged in the test box, and the box temperature sensor is used for detecting the box temperature in the internal accommodation space; the temperature control module controls the switch of the microcomputer heating table to make the table top temperature within a preset temperature range; the temperature control module controls the switch of the environmental heat dissipation component to make the box temperature of the test box maintained between 15 and 25 degrees; when the temperature detected by the box temperature sensor is higher than 21 degrees Celsius, the temperature control module starts the refrigeration mode of the semiconductor refrigerator; and when the temperature detected by the box temperature sensor is lower than 19 degrees Celsius, the temperature control module stops the refrigeration mode of the semiconductor refrigerator.

4. The multi-variable dynamic fabric heat transfer performance testing system of claim 3, wherein, The environmental heat dissipation component is an air conditioner, the test box is made of copper, the outer wall of the heat dissipation and moisture preservation box is provided with a heat dissipation aluminum fin, and the air outlet of the air conditioner is arranged towards the heat dissipation aluminum fin.

5. The multi-variable dynamic fabric heat transfer performance testing system of claim 1, wherein, The side wall of the test box is a hollow cavity side wall, a plurality of hollow cavity side walls surround the internal accommodation space in the test box, the humidity regulation system comprises a desiccant, a humidifier and a humidity sensor, the desiccant and the humidifier are located in the hollow cavity side wall, and the humidity sensor is arranged in the internal accommodation space; the desiccant is used for absorbing moisture in the test box, and the humidifier is used for humidifying the test box. A humidity control module is arranged on the switch control integrator, the humidity control module obtains the box humidity through the humidity sensor, and controls the switch of the humidifier according to the box humidity to regulate the box humidity in the test box.

6. The multi-variable dynamic fabric heat transfer performance testing system of claim 1, wherein, The wind speed adjusting system comprises a fan, a wind speed detector, a flow net and a hollow plate; holes are formed on the left and right sides of the test box body, and the fan, the flow net and the hollow plate are sequentially installed in the holes; the wind speed detector is used to detect the table top wind speed above the microcomputer heating table; The switch control integrator is provided with a wind control module; the wind control module acquires the table top wind speed through the wind speed detector, and controls the switch of the humidifier according to the table top wind speed, so as to adjust the table top wind speed in the test box body.

7. The multi-variable dynamic fabric heat transfer performance testing system of claim 1, wherein, The heat flux sensor is arranged on the heat dissipation and moisture preservation box, and is used to detect the heat transfer flux of the fabric sample.

8. A multivariable dynamic thermal comfort performance index test method, characterized in that, The application is applied to a multivariable dynamic fabric heat transfer performance test system, and the multivariable dynamic fabric heat transfer performance test system comprises a test box body, a heat dissipation and moisture preservation box, a switch control integrator, a temperature adjusting system, a humidity adjusting system and a wind speed adjusting system; the heat dissipation and moisture preservation box surrounds the test box body; the heat dissipation and moisture preservation box is internally provided with an internal receiving space; the temperature adjusting system comprises a microcomputer heating table; the microcomputer heating table is located in the internal receiving space; the microcomputer heating table carries a fabric sample; the microcomputer heating table is used to heat the fabric sample; the switch control integrator is used to control the temperature adjusting system, the humidity adjusting system and the wind speed adjusting system, so as to adjust the box temperature, the box humidity and the box wind speed of the test box body; and the multivariable dynamic fabric heat transfer performance test method comprises the following steps: The fabric sample is preprocessed and placed on the microcomputer heating table in the test box body; The temperature adjusting system, the humidity adjusting system and the wind speed adjusting system are controlled by the switch control integrator, so as to adjust the box temperature, the box humidity and the box wind speed of the test box body to target box temperature, target box humidity and target box wind speed; The heat transfer performance index of the fabric sample is collected by the detection module.

9. The multivariable dynamic fabric heat transfer performance index test method according to claim 8, wherein, The fabric sample is preprocessed and placed on the microcomputer heating table in the test box body, and the method comprises the following steps: The fabric sample is cut into a 16mm*16mm specification, dried in an 80-120℃ oven for 6 hours, and weighed as an initial weight; The fabric sample is wrapped with double-layer heat insulation adhesive tape and then placed in the microcomputer heating table in the test box body for 2 hours in a 20±1℃ humidity environment.

10. The multivariable dynamic fabric heat transfer performance index test method according to claim 8, wherein, The temperature adjusting system, the humidity adjusting system and the wind speed adjusting system are controlled by the switch control integrator, so as to adjust the box temperature, the box humidity and the box wind speed of the test box body to target box temperature, target box humidity and target box wind speed, and the method comprises the following steps: A target box temperature and a preset temperature transfer function expression are acquired; A set temperature is determined based on the temperature transfer function expression and the target box temperature; The set temperature is input into the temperature adjusting system, so that the temperature adjusting system adjusts the box temperature of the test box body to the target box temperature.

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