CN103076272A - Method for measuring heat resistance and moisture resistance of hat - Google Patents

Abstract

The invention relates to a method for measuring thermal resistance and moisture resistance of a hat. The method is to use strong surrounding wind to drive away the influence of the air layer outside the simulated head, measure the moisture resistance of the simulated skin itself, and measure the air layer outside the simulated head under the condition of no wind. Finally, under normal conditions, the simultaneous measurement of hat thermal resistance and moisture resistance is realized. The invention can accurately measure the heating power and sweating amount of the simulation head, and the thermal resistance and the moisture resistance of the cap can be measured synchronously in one step at the sweating simulation head.

Description

A Method of Measuring Hat Thermal Resistance and Humidity Resistance

technical field

The invention relates to a method for measuring clothing heat resistance and moisture resistance, in particular to a method for measuring hat heat resistance and moisture resistance.

Background technique

At present, many kinds of sweating thermal dummies have appeared in the world. However, due to various reasons, there have been no papers on the evaluation of the thermal comfort of hats using thermal dummies. In fact, using the entire thermal dummies Evaluating hats alone presents many technical problems in specific measurements. It is more realistic and reasonable to use the dummy head to measure the thermal comfort of the hat than the whole dummy. There have been multiple simulation heads in the world, but the fake head capable of simulating sweating is only developed by Herring, A.M, etc. to evaluate the physiological comfort of motorcycle safety helmets (Hering, A.M.Weder, M.Rickards, N.Mattle, M.Evaluation of physiological properties of motorcycle safety helmets usng a new sweating thermal head manikin[C].Proceedings of the Fourth International Meeting on Thermal Mankins,EMPA,Switzerland,27-28Sep.2001,1-4). The simulated head is composed of the skull, face and neck, and the three parts are individually heated and controlled independently. The simulated head includes 25 sweating holes, which are distributed on the face and skull. The distilled water in the water tank above the dummy head is fed into the dummy head through pipes, and the sweating volume of each sweating hole is controlled by a separate valve. The simulated head can work under constant temperature and constant heat mode, and the test result indicates the thermal comfort performance of the helmet by the degree of face temperature drop. However, this fake head adopts the active sweating method, and its sweating water supply is a quantitative water supply mode. It is often impossible to estimate in advance how much sweating is needed during the test, so the thermal comfort index of the hat cannot be determined: Effective measurement of thermal resistance and moisture resistance.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for measuring the thermal resistance and moisture resistance of the hat, which can accurately measure the sweating amount of the analog head, and the thermal resistance and moisture resistance of the hat can be simultaneously measured in one step on the sweating analog head .

The technical solution adopted by the present invention to solve the technical problem is to provide a method for measuring the thermal resistance and moisture resistance of a hat by using the above-mentioned sweating simulation head device, including the following steps:

其中，R_es是模拟头装置中模拟皮肤本身的湿阻，A是模拟头装置的整个表面积，P_is是出汗皮肤内侧在模拟头皮肤温度下的饱和湿蒸汽压，P_a是环境在环境温度下的饱和湿蒸汽压，RH_a是环境的相对湿度，E是水的汽化热，G_s是裸头吹风条件下的出汗量；(1) Under the condition of strong surrounding wind, the air layer outside the simulation head device is divided into two parts by using a partition, and the powerful fan is placed in the opposite position to blow air, and the wind covering the simulation head in two directions forms a surrounding wind , so that the thermal resistance and moisture resistance of the air layer outside the simulation head approach a very small value, and measure the moisture resistance of the sweating skin of the simulation head after the system is balanced:

Among them, R _es is the moisture resistance of the simulated skin itself in the simulated head device, A is the entire surface area of the simulated head device, P _is the saturated moisture vapor pressure inside the sweating skin at the temperature of the simulated head skin, and _Pa is the environment in the environment Saturated moisture vapor pressure at temperature, RH _a is the relative humidity of the environment, E is the heat of vaporization of water, G _s is the sweating amount under the condition of bare head blowing;

(2) Under no wind conditions, measure the thermal resistance and moisture resistance of the air layer outside the analog head after the system is balanced: $R_{e0}=\frac{A(P_{\mathrm{is}}-P_a\·{\mathrm{RH}}_a)}{\mathrm{E.}\&Center\; Dot;G_0}-R_{\mathrm{es}},$ $R_{t0}=\frac{A(t_{\mathrm{the\; s}}-t_a)}{h_0-\mathrm{E.}\&Center\; Dot;G_0},$ Among them, R _e0 is the moisture resistance of the air layer outside the hat, G ₀ is the sweating amount of the bare head without blowing, R _t0 is the thermal resistance of the air layer outside the hat, t _s is the skin temperature of the simulated head, and t _a is the environment Temperature, H ₀ is the total heating power of the bare head without blowing;

(3) Put the hat on the simulation head device, the thermal resistance and moisture resistance of the hat after the system is balanced can be directly measured $R_{\mathrm{em}}=\frac{A(P_{\mathrm{is}}-P_a\·{\mathrm{RH}}_a)}{\mathrm{E.}\&Center\; Dot;G}-R_{\mathrm{es}}-\frac{R_{e0}}{f},$ $R_{\mathrm{tm}}=\frac{A(t_{\mathrm{the\; s}}-t_a)}{h-\mathrm{E.}\·G}-\frac{R_{t0}}{f},$ Among them, R _em is the moisture resistance of the hat, G is the amount of sweating during the test, f is the area coefficient, which is determined according to the specific covering state of the hat and the head, R _tm is the thermal resistance of the hat, and H is the total heating of the simulated head power.

The sweating simulation head device includes a base, a simulation skin and a vertical water supply pipe, a chassis is installed on the base, the simulation skin is set on the chassis through a tight hoop, the simulation skin is filled with water and forms a simulation head , the chassis is equipped with a heating rod for heating the water in the simulation head; the vertical water supply pipe passes through the base and communicates with the inside of the simulation head; the inner surface of the simulation head is provided with an inner temperature sensor, and the outer surface is provided with an outer A temperature sensor; both the internal temperature sensor and the external temperature sensor are connected to the measurement and control system, and the measurement and control system controls the heating of the heating rod according to the values measured by the internal temperature sensor and the external temperature sensor.

The bottom of the simulation head is uniformly equipped with water pumps with diversion sleeves for evenly circulating the water inside the simulation head up and down.

The simulated skin is made of PTFE microporous membrane composite fabric.

The measurement and control system adopts PID operation output switch ratio to control the heating of the heating rod.

The water pump is evenly distributed around the heating rod, so that the temperature difference of the surface temperature of each part of the simulation head is less than 1.5°C.

The water level of the vertical water supply pipe is 1-2m higher than the simulated head top.

The base is a thermal insulation base.

The heat preservation base is made of foam plastic.

Beneficial effect

Due to the adoption of the above-mentioned technical solution, the present invention has the following advantages and positive effects compared with the prior art: the present invention adopts the principle of passive sweating simulation, and the amount of sweating is automatically adjusted according to the specific wearing conditions and environmental conditions of the simulation head Yes, the consumption of water in the water supply pipe is equal to the amount of sweat lost on the simulated head, and the sweating of the simulated head can be accurately measured by recording the drop of the water level in the water pipe. Therefore, the sweating simulation head in the present invention can accurately measure the thermal resistance and moisture resistance of the hat, and at the same time can better evaluate the thermal comfort of the head in various environments.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of a strong surrounding wind blowing simulation head device.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Embodiments of the present invention relate to a sweating simulation head device, as shown in FIG. The hoop 2 is set outside the chassis 3, the simulated skin 4 is filled with water to form a simulated head, the chassis 3 is equipped with a heating rod 7 for heating the water in the simulated head; the vertical water supply pipe 8 passes through The base 1 communicates with the inside of the analog head; the inner surface of the analog head is provided with an inner temperature sensor 5, and the outer surface is provided with an outer temperature sensor 6; the inner temperature sensor 5 and the outer temperature sensor 6 are both connected to the measurement and control system , the measurement and control system controls the heating of the heating rod 7 according to the measured values of the inner temperature sensor 5 and the outer temperature sensor 6 .

Wherein, the bottom of the simulation head is uniformly installed with a water pump 10 with a guide sleeve 9 for uniformly circulating the water inside the simulation head up and down, so that the water inside the head can be evenly circulated up and down to reach the temperature of each part of the simulation head. Uniform and consistent. There can be 3-4 water pumps 10, and they are evenly distributed around the heating rod 7, so that the temperature difference of the surface temperature of each part of the simulation head is less than 1.5°C

The simulated skin 4 is made of PTFE microporous membrane composite fabric, which expands to form a simulated head after being filled with pressurized water, and "sweat" is released outward under the joint action of water pressure and temperature.

The inside of the sweating simulation head is heated by the heating rod 7, and the switch control mode is adopted, and the measurement and control system uses the PID calculation output switch ratio to control the heating of the heating rod 7.

The sweating simulation head adopts the principle of passive sweating, and the water lost by the sweating head is automatically replenished by the vertical water supply pipe 8, so the sweating of the simulation head can be accurately measured by accurately measuring the drop of the water level in the vertical water supply pipe 8 quantity. The vertical water supply pipe 8 is vertically installed, and its water level is higher than the top of the simulation head at a certain distance, preferably 1 to 2m. By setting the water levels of different heights, the sweating amount of the simulation head can be changed within a certain range.

The base 1 is a thermal insulation base. The heat preservation base is made of foam plastic. The use of a substantially heat-insulating foam base can basically dissipate the heating power from the analog head, so as to ensure the minimum systematic error when the analog head is used for measurement.

Since the sweating amount of the simulated sweating head can be directly measured, the damp heat power of sweating can be directly calculated, and the dry heat can also be directly calculated by subtracting the damp heat power from the total heating power. In the case of simulating the thermal resistance and moisture resistance of the air layer outside the head, the thermal resistance and moisture resistance of the hat can be measured simultaneously. The specific steps are as follows: (The test condition is a constant temperature and humidity environment)

(1) Under the condition of strong surrounding wind, the air layer outside the simulation head device is divided into two parts by using a partition, and the powerful fan is placed in the opposite position to blow air, and the wind covering the simulation head in two directions forms a surrounding wind , so that the thermal resistance and moisture resistance of the air layer outside the simulation head approach a very small value, and measure the moisture resistance of the sweating skin of the simulation head after the system is balanced:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; es</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; is</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; RH</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, R _es is the moisture resistance of the simulated skin itself in the simulated head device, Pa m ² /W, A is the entire surface area of the simulated head device, m ² , and P _is the saturation of the inner side of the sweating skin at the temperature of the simulated head skin Wet vapor pressure, Pa, _Pa is the saturated wet vapor pressure of the environment at ambient temperature, Pa, RH _a is the relative humidity of the environment, %, E is the heat of vaporization of water, 0.672Wh/g at 35°C, G _s is the sweating amount under the condition of bare head blowing, g/h;

(2) Under no wind conditions, measure the thermal resistance and moisture resistance of the air layer outside the analog head after the system is balanced:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; is</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; RH</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; es</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, R _e0 is the moisture resistance of the air layer outside the hat, Pa m ² /W, G ₀ is the sweating amount under the condition of bare head without blowing wind, g/h, R _t0 is the thermal resistance of the air layer outside the hat, °C m ² /W, t _s is the skin temperature of the simulated head, ℃, t _a is the ambient temperature, ℃, H ₀ is the total heating power of the bare head without blowing, W;

(3) Put the hat on the simulation head device, the thermal resistance and moisture resistance of the hat after the system is balanced can be directly measured:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; em</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; is</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; RH</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; es</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; tm</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, R _em is the moisture resistance of the hat, Pa·m ² /W, G is the amount of sweat during the test, g/h, f is the area factor, determined according to the specific coverage state of the hat and the head, R _tm is the hat The thermal resistance, ℃·m ² /W, H is the total heating power of the analog head, W.

The present invention will be further described below with a specific embodiment.

The experiment is carried out in a constant temperature and humidity room at 20±0.5°C and 65±3% relative humidity:

1. Under the condition of strong wind blowing according to Figure 2, the skin temperature of the simulated head is controlled at 35°C, the sweat rate of the naked simulated head reaches 52.8g/m ² h, and the surface area of the simulated head is 0.165m ² , at 35°C The saturated wet vapor pressure of air is 5626Pa, the saturated wet vapor pressure of air at 20°C is 2338.5Pa, and the heat of evaporation of water at 35°C is 0.672W h/g. According to formula (1), the moisture resistance of the skin itself is simulated It is 19 Pa·m ² /W.

2. Under windless conditions, the skin temperature is still 35°C, and the sweat rate of the naked simulated head is 28g/m2h. According to formula (2) and formula (3), the moisture resistance and thermal resistance of the air layer outside the simulated head They are 17 Pa·m ² /W and 0.064°C·m ² /W, respectively.

3. Put a tested hat on the simulated head. The hat is an elastic tight-fitting hat with ear protectors, and the area factor can be 1. The skin temperature of the simulated head is still controlled at 35°C. After the system reaches equilibrium, the sweating rate of the simulated head is 15.5g/m2h. According to formula (4) and formula (5), the moisture resistance and thermal resistance of the hat are respectively It is 29Pa·m ² /W and 0.029°C·m ² /W.

It is not difficult to find that the present invention adopts the principle of passive sweating simulation, and the amount of sweating is automatically adjusted according to the specific wearing conditions and environmental conditions of the simulated head. Recording the drop in the water level in the pipe allows for an accurate measurement of the amount of sweat the dummy head is sweating. Therefore, the sweating simulation head in the present invention can accurately measure the thermal resistance and moisture resistance of the hat, and at the same time can better evaluate the thermal comfort of the head in various environments.

Claims (9)

1. measure cap thermal resistance and the wet method that hinders for one kind, it is characterized in that, may further comprise the steps:

(1) under by force around the wind condition, use dividing plate that dummy head device outer space gas-bearing formation is divided into two parts, high-power fan places the relative position blowing, the wind of dummy head device both direction covers, and form around wind, make very little value of the outer air layer thermal resistance of dummy head and wet resistance convergence, the wet resistance of measure analog head perspiration skin itself after system balancing:

Wherein, R _EsBe the wet resistance of simulated skin in the dummy head device itself, A is the whole surface area of dummy head device, P _IsThat the saturated wet steam of perspiration skin inboard under the dummy head skin temperature pressed P _aThat environment saturated wet steam is at ambient temperature pressed RH _aBe the relative humidity of environment, E is the heat of vaporization of water, G _sNaked the volume of perspiration under the blowing condition;

(2) under calm condition, the thermal resistance of a measure analog outside air layer and wet resistance after the system balancing: $R_{e0}=\frac{A(P_{\mathrm{is}}-P_a\&CenterDot;{\mathrm{RH}}_a)}{E\&CenterDot;G_0}-R_{\mathrm{es}},$ $R_{t0}=\frac{A(t_s-t_a)}{H_0-E\&CenterDot;G_0},$ Wherein, R _E0The wet resistance of cap outer space gas-bearing formation, G ₀The volume of perspiration under naked not blowing of the head condition, R _T0The thermal resistance of cap outer space gas-bearing formation, t _sThe dummy head skin temperature, t _aEnvironment temperature, H ₀It is total heating power that naked head is not being dried;

(3) cap is placed on the described dummy head device certainly, the thermal resistance of cap and wet resistance can directly measure after the system balancing

$R_{\mathrm{em}}=\frac{A(P_{\mathrm{is}}-P_a\&CenterDot;{\mathrm{RH}}_a)}{E\&CenterDot;G}-R_{\mathrm{es}}-\frac{R_{e0}}{f},$ $R_{\mathrm{tm}}=\frac{A(t_s-t_a)}{H-E\&CenterDot;G}-\frac{R_{t0}}{f},$ Wherein, R _EmBe the wet resistance of cap, G is volume of perspiration in the test process, and f is area coefficient, according to cap and head concrete covering state determine R _TmBe the thermal resistance of cap, H is total heating power of dummy head.

2. the method for measurement cap thermal resistance according to claim 1 and wet resistance, it is characterized in that, described sweating simulation head unit comprises base (1), simulated skin (4) and vertical feed pipe (8), chassis (3) is installed on the described base (1), described simulated skin (4) is enclosed within on the described chassis by tighten ring, be full of water and form dummy head in the described simulated skin (4), be equipped with on described chassis (3) for the heating rod (7) to the heating of the water in the dummy head; Described vertical feed pipe (8) passes base (1) and is connected with dummy head inside; Described dummy head inside surface is provided with interior temperature sensor (5), and outside surface is provided with outer temperature sensor (6); Described interior temperature sensor (5) all links to each other with described TT﹠C system with outer temperature sensor (6), and described TT﹠C system is according to the described heating rod of measured Numerical Control (7) heating of interior temperature sensor (5) and outer temperature sensor (6).

3. measurement cap thermal resistance according to claim 2 and the wet method that hinders is characterized in that the uniform water pump (10) that is equipped be used to the band flow guide sleeve (9) of the lower uniform circulation waterborne that makes dummy head inside in the bottom of described dummy head.

4. measurement cap thermal resistance according to claim 2 and the wet method that hinders is characterized in that, described simulated skin (4) is made by PTFE microporous barrier compound fabric.

5. measurement cap thermal resistance according to claim 2 and the wet method that hinders is characterized in that, described TT﹠C system adopts PID computing output switch proportional control heating rod (7) heating.

6. the method for measurement cap thermal resistance according to claim 3 and wet resistance is characterized in that, described water pump (10) be evenly distributed on described heating rod (7) around, make the temperature difference of dummy head each several part surface temperature less than 1.5 ℃.

7. measurement cap thermal resistance according to claim 2 and the wet method that hinders is characterized in that, the water level of described vertical feed pipe (8) is higher than dummy head top 1-2m.

8. measurement cap thermal resistance according to claim 2 and the wet method that hinders is characterized in that, described base (1) is heat-insulating base.

9. measurement cap thermal resistance according to claim 8 and the wet method that hinders is characterized in that, described heat-insulating base adopts polyfoam to make.

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