CN115684252A - An on-site testing system for wall heat and humidity performance and a method for selecting suitable thermal insulation materials - Google Patents

Abstract

The invention relates to a wall heat and humidity performance field test system and a suitable heat insulation material selection method, wherein the wall heat and humidity performance field test system comprises a heat and humidity environment isolation box, an air treatment system, a heat insulation material replacement module, a sensor and a data acquisition and analysis system; the heat and humidity environment isolation box isolates the inner surface of the wall body within a specific range; the air treatment system is connected to the hot and humid environment isolation box, and is used for treating air to required temperature and humidity and conveying the air to the hot and humid environment isolation box; the heat insulation material replacement module is positioned in the hot and humid environment isolation box and is provided with heat insulation materials; the sensor collects temperature and humidity parameters in real time and is electrically connected to the data collecting and analyzing system; and the data acquisition and analysis system collects the parameters fed back by the sensors and calculates to obtain the thermal resistance and the wet resistance of the wall body. The invention can measure the initial heat and humidity performance of the wall body under the condition of not damaging the wall body, can obtain the improvement condition of different heat-insulating materials on the heat and humidity insulating capability of the wall body, and is beneficial to selecting a proper heat-insulating mode for the existing building wall body.

Description

An on-site testing system for wall heat and humidity performance and a method for selecting suitable thermal insulation materials

【Technical field】

The invention relates to a heat and humidity performance detection system, in particular to a wall heat and humidity performance field test system and a method for selecting suitable thermal insulation materials by using the system, belonging to the technical field of energy-saving building supporting equipment.

【Background technique】

Reducing energy consumption and carbon emissions in the building operation phase is the only way to achieve the goal of "carbon peaking in 2030 and carbon neutrality in 2060". The top priority of all kinds of energy consumption in the stage. In addition to improving the thermal performance of the wall, enhancing the moisture insulation capacity of the wall also helps to reduce the sensible heat load of the building and optimize the indoor thermal and humid environment. In addition, the improvement of the moisture insulation capacity of the wall can effectively weaken the moisture accumulation inside it, which will indirectly improve the thermal insulation performance of the wall. Therefore, the accurate measurement of the thermal and moisture performance of the wall and the selection of suitable thermal insulation materials for the wall have become an important part of the "double carbon" goal.

Existing methods for testing the thermal and hygroscopic performance of walls can be mainly divided into the following three categories: 1) laboratory small sample method, which is mainly realized by measuring the thermal and hygroscopic physical parameters of different wall materials in the laboratory; 2) laboratory The hot box method is mainly realized by creating a specific hot and humid environment on both sides of the replicated wall; 3) the field test method is mainly realized by monitoring the changes in temperature and humidity on both sides of the wall of the existing building and the adjacent environment. However, the existing test methods for thermal and moisture performance of walls have their own shortcomings: 1) For the first method, it is difficult to correctly reflect the actual situation of building materials in the wall (such as contact thermal resistance, wall Body moisture storage, changes in physical parameters caused by time), and the specificity of small samples often needs to be eliminated through a large number of repeated experiments, which greatly increases the economic cost and time cost. 2) For the second method, not all walls can be reproduced, such as old walls whose physical parameters have changed, walls of traditional wooden structures, etc., so the scope of application of this method is relatively limited, and the original outdoor environment exists Factors such as solar radiation and wind-driven rain were not considered, all of which limit the scope of application of this method. 3) For the third method, although the thermal and humidity performance of the wall can be measured more accurately, its specific requirements for the air temperature and humidity in the building have affected the normal use of the residents; in addition, this method is still not enough for the selection of suitable thermal insulation. Materials provide guidance.

Therefore, in order to solve the above problems, it is indeed necessary to provide an innovative on-site testing system for thermal and humidity performance of walls and a method for selecting suitable thermal insulation materials, so that it will not affect the normal use of residents during the testing process, and can faithfully reflect the outdoor meteorological conditions. At the same time, a simple and feasible method is developed based on the same system, so that it can provide guidance for the selection of suitable insulation materials for the measured wall.

【Content of invention】

The purpose of the present invention is to provide an on-site testing system for thermal and humidity performance of walls, which can test the thermal and humidity performance of walls in real environments without causing any damage to existing walls and without affecting the normal use of indoor residents. In addition, it can provide a variety of temporary insulation layers for the building walls, making it possible to measure the actual improvement of the thermal and humidity performance of the walls after the insulation layer is laid and to directly determine whether there is condensation inside the building, which is beneficial to the walls. Protection against mildew and shedding of the finish layer.

Another object of the present invention is to provide a method for selecting a suitable thermal insulation material for a wall by using the above-mentioned on-site test system for thermal and humidity performance of the wall. This method can directly test the temporary thermal insulation of the existing wall after adding different materials. The heat-humidity performance of the layer, and according to whether there is condensation inside the wall during the test, comprehensively select the insulation material suitable for the existing wall and considering the local climate.

In order to achieve the above-mentioned first purpose, the technical solution adopted by the present invention is: an on-site test system for thermal and humidity performance of walls, which can measure the thermal resistance and moisture resistance of building walls, which includes a thermal and humid environment isolation box, an air handling system , thermal insulation material replacement module, sensor, data acquisition and analysis system; wherein, the hot and humid environment isolation box includes a box body, a pressure equalizing plate and a sealing member; the box is located on the inner side of the building wall; the pressure equalizing plate is embedded in Inside the box; the sealing member is arranged between the box and the building wall; the air handling system is connected to the heat and humidity environment isolation box, which processes the air to the required temperature and humidity, and transports it to the heat and humidity environment for isolation box; the insulation material replacement module is located in the heat-humid environment isolation box, on which insulation material is installed; the sensor collects the temperature and humidity parameters of the inner and outer surfaces of the wall and the air environment in the heat-humid environment isolation box in real time, and its electrical connection to the data acquisition and analysis system; the data acquisition and analysis system collects real-time parameters fed back by sensors, and calculates the thermal resistance and moisture resistance of the building wall.

The on-site testing system for thermal and humidity performance of the wall of the present invention is further as follows: the overall body of the box is a cuboid with a length of 0.6m and a square section of 2.0m×2.0m; one side of the box is open, and the other five surfaces are The shell is composed of 1.0mm aluminum plate, 50.0mm polyurethane foam and 1.0mm aluminum plate arranged in sequence; there are slots on the edge of the shell facing the wall, and the sealing components are installed in the slots; four There are two self-locking universal wheels; the surface of the box close to the wall is provided with a number of pressure regulating holes.

The on-site testing system for wall heat and humidity performance of the present invention is further as follows: the pressure equalizing plate is an aluminum plate with a thickness of 1.0 mm, which is square, and the distance between it and the bottom surface of the box is 0.2 m; circular hole.

The on-site test system for wall heat and humidity performance of the present invention is further as follows: the sealing member is made of silica gel, which is in the shape of a square ring as a whole; the width of the direct contact between the sealing member and the wall is 60.0mm; The part is provided with a plug, and the plug is connected with the slot.

The on-site testing system for wall heat and humidity performance of the present invention is further as follows: the air treatment system is composed of a filter heat exchange section, a temperature and humidity treatment section, and an air flow power section; a filter is provided in the filter heat exchange section; A cooler is arranged in the wet treatment section, a heater is arranged behind the cooler, and a humidifier is arranged behind the heater; a circulation fan is arranged in the air flow power section, which drives indoor air into the air handling system, and flows through the heat After the humid environment isolating box, it escapes from the pressure regulating hole to the indoor environment; the airflow power section is provided with an air duct connected to the hot and humid environment isolating box.

The on-site testing system for wall heat and humidity performance of the present invention is further as follows: the insulation material replacement module includes an insulation material bracket and a silica gel sealing ring; the insulation material bracket is provided with four slots; the insulation material can be installed in the four slots respectively in place.

The on-site test system for wall heat and humidity performance of the present invention is further as follows: the silicone sealing ring is in the shape of a square ring as a whole, which is composed of a front section with a constant cross-sectional area and a rear section with an enlarged cross-sectional area; The enlarged part of the cross-sectional area of the rear section is in contact with the wall.

The on-site testing system for wall heat and humidity performance of the present invention further includes: the sensor includes an inner wall surface temperature and humidity sensor, an outer wall surface temperature and humidity sensor, an isolation box temperature and humidity sensor, and an insulation material surface temperature and humidity sensor, and the measurement range is not less than - 20.0～60.0℃ and 0～100% RH, the accuracy is not lower than ±0.5℃ and ±3% RH, the measurement frequency is not lower than 0.1Hz; the temperature and humidity sensor of the isolation box is connected with the temperature and humidity processing section and the The data acquisition and analysis system is connected to transmit the measured temperature and humidity data to the air processing system and the data acquisition and analysis system; the temperature and humidity sensor on the inner wall surface, the temperature and humidity sensor on the outer wall surface, the temperature and humidity sensor on the surface of the insulation material It is connected with the analysis system and transmits the measured temperature and humidity data to the data acquisition and analysis system.

The on-site testing system for wall heat and humidity performance of the present invention further includes: the temperature and humidity sensor on the inner wall is set at the center of the inner surface of the wall within the range of the heat and humidity environment isolation box; the temperature and humidity sensor on the outer wall is set at the same On the outer surface of the wall corresponding to the temperature and humidity sensor on the inner wall; the temperature and humidity sensor of the isolation box is located at a distance of 100.0mm from the inner surface of the wall and corresponds to the temperature and humidity sensor on the inner wall; the temperature and humidity sensor on the surface of the thermal insulation material is set In the center of the surface of the insulation material in contact with the air.

In order to achieve the above-mentioned second purpose, the technical solution adopted by the present invention is: a method for selecting a suitable thermal insulation material for a wall, which uses the above-mentioned on-site test system for the thermal and humidity performance of the wall, and the selection method includes the following steps:

1), select the test location of the building wall, arrange the temperature and humidity sensor on the inner wall surface, the temperature and humidity sensor on the outer wall surface, and the temperature and humidity sensor of the isolation box at the correct position, and push the heat and humidity environment isolation box to the target position so that it is in line with the building The walls are in close contact and form a relatively closed space;

2) Set the temperature and humidity required for the experiment on the air handling system, and proceed to the next step when the temperature and humidity in the heat and humidity environment isolation box reach the set value and the fluctuation rate per 10 minutes is lower than 5%;

将从内壁面温湿度传感器所读出的温度与相对湿度分别记为T_in与

将从外壁面温湿度传感器所读出的温度与相对湿度分别记为T_out与

数据采集及分析系统计算得到热湿环境隔离箱内空气水蒸气分压力、墙体内表面水蒸气分压力和墙体外表面水蒸气分压力分别为p_air、p_in和p_out，其计算式为：3) Maintain the previous working condition for a period of time, record the start time as τ ₁ , record the end time as τ ₂ , and record the temperature and relative humidity read from the temperature and humidity sensor of the isolation box as T _air and

Record the temperature and relative humidity read from the temperature and humidity sensor on the inner wall as T in and T _in respectively.

The temperature and relative humidity read from the temperature and humidity sensor on the outer wall are respectively recorded as T _out and

The data acquisition and analysis system calculates the partial pressure of water vapor in the air in the heat-humid environment isolation box, the partial pressure of water vapor on the inner surface of the wall, and the partial pressure of water vapor on the outer surface of the wall as p _air , _pin and p _out respectively, and the calculation formula for:

和

and

和

4), the convective heat transfer coefficient h of the inner surface of the wall is regarded as 4.00W m ^–2 K ^–1 , according to the Lewis criterion, the convective mass transfer coefficient h _m of the inner surface of the wall is 2.94×10 ^–8 s/m; The data acquisition and analysis system calculates the total heat flux and total mass flux on the inner surface of the wall during this period as Q and Q _m respectively, and the calculation formulas are

and

根据质量守恒，通过墙体的质通量与墙体内表面的质通量Q_m相等，计算得到墙体的湿阻R_m，其计算式为

5), according to energy conservation, the heat flux passing through the wall is equal to the heat flux Q on the inner surface of the wall, and the thermal resistance R of the wall is calculated, and its calculation formula is

According to the conservation of mass, the mass flux through the wall is equal to the mass flux Q _m on the inner surface of the wall, and the moisture resistance R _m of the wall is calculated, and its calculation formula is

6), remove the heat and humidity environment isolation box, remove the temperature and humidity sensor on the inner wall and the sealing member; install the insulation material replacement module and fill in 4 kinds of insulation materials with the same thickness, arrange the temperature and humidity sensor on the surface of the insulation material at the correct position, and place the The hot and humid environment isolation box is pushed to the target position so that it is in close contact with the building wall and forms a relatively airtight space;

7), repeat steps 2) to 5) to obtain the thermal resistance and moisture resistance of the wall with different insulation materials, remove the heat and humidity environment isolation box, observe whether there is condensation on the contact surface between the insulation material and the wall, and comprehensively select the appropriate one. Insulation Materials.

Compared with the prior art, the present invention has the following beneficial effects:

1. The on-site testing system for wall heat and humidity performance of the present invention can test its heat and humidity performance under actual climatic conditions without causing any damage to existing building walls, and during the test period, it is not necessary for residents to live and use normally. At the same time, the test system can be applied to the optimization of thermal insulation and moisture insulation performance of historical buildings and traditional wooden structures; in addition, the system is simple in structure, reusable, and has a long service life, and its durability is strongly guaranteed.

2. The on-site test system for wall heat and humidity performance of the present invention can provide various temporary insulation layers for existing building walls, so as to measure the actual improvement of the heat and humidity performance of the wall after laying the insulation layer and directly determine whether the interior of the building is Condensation becomes possible, which is beneficial to the protection of walls from mildew and peeling off of finishes.

3. The method for selecting a suitable thermal insulation material for the wall of the present invention is to directly test the heat and humidity performance of the existing wall after installing a temporary thermal insulation layer of different materials, and comprehensively select the suitable thermal insulation material according to whether condensation occurs inside the wall during the test. Insulation materials with existing walls and taking into account the local climate conditions.

4. The method for selecting a suitable thermal insulation material for the wall of the present invention can measure the thermal resistance and moisture resistance when the wall adopts different thermal insulation materials, and use this method to accurately evaluate the heat insulation and moisture insulation performance of the wall brought by different thermal insulation materials Improve the situation, and determine whether the use of insulation materials brings risks such as water vapor condensation that are not conducive to the life of the wall and indoor air quality.

【Description of drawings】

Fig. 1 is a perspective view of the on-site testing system for wall heat and humidity performance of the present invention.

Fig. 2 is a cross-sectional view of the on-site testing system for wall heat and humidity performance of the present invention when the sealing member is included.

Fig. 3 is a cross-sectional view of the on-site testing system for the heat and humidity performance of the wall body of the present invention when the module including the insulation material is replaced.

Fig. 4 is a perspective view of the thermal insulation material bracket in Fig. 3 .

Fig. 5 is a partial enlarged view of A in Fig. 1 .

【Detailed ways】

Please refer to accompanying drawings 1 to 5 of the description, the present invention is a wall heat and humidity performance on-site testing system, which can measure the thermal resistance and moisture resistance of a building wall 100, which consists of a heat and humidity environment isolation box, an air Processing system, thermal insulation material replacement module, sensor, data acquisition and analysis system 11 and other parts.

Wherein, the heat and humidity environment isolation box is to isolate the inner surface of the wall body 100 within a specific area, so that it does not undergo direct heat and mass exchange with the indoor air of the building, and creates a constant heat and humidity required for the experiment on the inner surface of this part. The environment is composed of several parts such as a box body 1 , a pressure equalizing plate 2 and a sealing member 3 . Wherein, the box body 1 is located on the inner side of the building wall 100, and it is in the shape of a cuboid as a whole, with a length of 0.6m and a square section of 2.0m×2.0m, which is used to create an experimental surface for the inner surface of the wall with an area of ^4.0m2 . Required constant heat and humidity environment. One side of the box body 1 is open, and the shell 1-1 on the other five surfaces is composed of 1.0mm aluminum plates, 50.0mm polyurethane foam plastics and 1.0mm aluminum plates arranged in sequence to reduce the impact of the indoor environment on the box body. Influence of hot and humid environment. A slot 1-2 is provided on the edge of the casing 1-1 facing the wall 100, and the sealing member 3 is installed in the slot 1-2. There are four self-locking universal wheels 1-3 at the bottom of the box body 1. By moving and locking the box body 1, the sealing member 3 can be in close contact with the inner surface of the wall body 100, and the gap between the two can be reduced as much as possible. . The surface of the box body 1 close to the wall 100 is provided with several pressure regulating holes 1-4 to reduce the air pressure in the box body 1 .

The pressure equalizing plate 2 is embedded inside the box body 1, which is an aluminum plate with a thickness of 1.0mm, which is square, and the distance between it and the inner bottom surface of the box body 1 is 0.2m, and it is used to make direct contact with the inner surface of the isolated wall The air on the inner surface of the wall is uniform, and the air velocity at the inner surface of the wall is reduced as much as possible. The pressure equalizing plate 2 is densely covered with circular holes 2-1 with a diameter of 8.0mm.

The sealing member 3 is arranged between the box body 1 and the building wall body 100, is made of silica gel, and is in the shape of a square ring as a whole. The width of the direct contact between the sealing member 3 and the wall 100 is 60.0 mm, which can reduce the heat and moisture transfer in the gap between the box 1 and the wall 100 while sealing the box 1 . A plug 3-1 is provided at the rear of the sealing member 3, and the plug 3-1 is closely connected with the socket 1-2.

The air handling system is connected to the heat and humidity environment isolation box, which processes the air to the required temperature and humidity, and delivers it to the heat and humidity environment isolation box. Specifically, the air treatment system is composed of a filter heat exchange section 4 , a temperature and humidity treatment section 5 , and an air flow power section 6 . The filter heat exchange section 4 is provided with a filter 4-1, the filter efficiency of which is not lower than 99%, and is used to prevent impurities from being sucked into the air treatment system. The temperature and humidity treatment section 5 is provided with a cooler 5-1 for reducing the air temperature and absolute humidity. A heater 5-2 is provided behind the cooler 5-1, which is used to increase the temperature of the airflow and reduce the relative humidity of the airflow. A humidifier 5-3 is provided behind the heater 5-2 to increase the absolute humidity of the airflow. The air flow power section 6 is provided with a circulating fan 6-1, which is used to provide power for the air, which drives the indoor air into the air handling system, and escapes from the pressure regulating hole 1-4 after flowing through the heat and humidity environment isolation box to the indoor environment. Further, the gas flow power section 6 is provided with an air duct 6-2 connected to the heat and humidity environment isolation box, which is used to create a passage for the gas treated 5 by the air treatment system to flow to the heat and humidity environment isolation box.

The insulation material replacement module is located in the heat-humid environment isolation box, which provides various temporary internal insulation for the building wall 100, and therefore, the insulation material 9 is installed thereon. Further, the thermal insulation material replacement module also includes a thermal insulation material bracket 7 and a silicone sealing ring 8 . The thermal insulation material bracket 7 is provided with four slots 7-1, which can simultaneously test the heat insulation and moisture insulation performance of the wall under the use of 4 kinds of thermal insulation materials with the same thickness. The thermal insulation material 9 can be respectively installed in the four slot positions 7-1. The silica gel sealing ring 8 is in the shape of a square ring as a whole, and it is composed of a front section 8-1 with a constant cross-sectional area and a rear section 8-2 with an enlarged cross-sectional area; -2 The enlarged cross-sectional area is in contact with the wall 100 to reduce the heat and moisture transfer between the box and the wall.

The sensor collects the temperature and humidity parameters of the inner and outer surfaces of the wall and the air environment in the heat and humidity environment isolation box in real time, and is electrically connected to the data acquisition and analysis system 11 . In this embodiment, the sensors include an inner wall surface temperature and humidity sensor 10-1, an outer wall surface temperature and humidity sensor 10-2, an isolation box temperature and humidity sensor 10-3, and an insulation material surface temperature and humidity sensor 10-4. The measurement of the above sensors The range is not less than –20.0～60.0℃ and 0～100% RH, the accuracy is not lower than ±0.5℃ and ±3% RH, and the measurement frequency is not lower than 0.1Hz.

The temperature and humidity sensor 10-3 of the isolation box is connected with the temperature and humidity processing section 5 and the data acquisition and analysis system 11 at the same time through a connection line, and the measured temperature and humidity data are transmitted to the air treatment system 5 and the data acquisition and analysis system 11 . Wherein, the temperature and humidity processing section 5 is connected to the temperature and humidity sensor 10-3 of the isolation box through a connection line, and the cooler 5-1 and the heater 5 are dynamically adjusted according to the set temperature and the real-time temperature and humidity fed back by the temperature and humidity sensor 10-3 of the isolation box -2. The power of the humidifier is 5-3, so that the temperature and humidity in the heat and humidity environment isolation box are relatively stable.

The temperature and humidity sensor 10-1 on the inner wall surface, the temperature and humidity sensor on the outer wall surface 10-2, and the temperature and humidity sensor on the surface of the thermal insulation material 10-4 are connected to the data acquisition and analysis system 11, and the measured temperature and humidity data are transmitted to the data acquisition system. And analysis system 11.

Further, the inner wall surface temperature and humidity sensor 10-1 is arranged at the center of the inner surface of the wall body 100 within the range of the heat and humidity environment isolation box. The outer wall temperature and humidity sensor 10-2 is arranged on the outer surface of the wall body 100 corresponding to the inner wall temperature and humidity sensor 10-1. The isolated box temperature and humidity sensor 10-3 is located at a distance of 100.0 mm from the inner surface of the wall and corresponds to the inner wall surface temperature and humidity sensor 10-1. The temperature and humidity sensor 10-4 on the surface of the thermal insulation material is located at the center of the surface of the thermal insulation material in contact with the air.

The data acquisition and analysis system 11 collects feedback from sensors (inner wall surface temperature and humidity sensor 10-1, outer wall surface temperature and humidity sensor 10-2, isolation box temperature and humidity sensor 10-3, insulation material surface temperature and humidity sensor 10-4) Real-time parameters, and calculate the building wall thermal resistance and moisture resistance.

The selection method for selecting suitable thermal insulation materials for walls using the above-mentioned on-site test system for thermal and humidity performance of walls is as follows:

1), select the test location of the building wall 100, arrange the temperature and humidity sensor 10-1 on the inner wall surface, the temperature and humidity sensor on the outer wall surface 10-2, and the temperature and humidity sensor 10-3 in the isolation box at the correct position, and isolate the hot and humid environment The box is pushed to the target position so that it is in close contact with the building wall 100 and forms a relatively airtight space;

2) Set the temperature and humidity required for the experiment on the air handling system (it is necessary to make the temperature and humidity difference between the air in the heat-humid environment isolation box and the outdoor air), and wait until the temperature and humidity in the heat-humid environment isolation box reach the set value and every 10 When the clock volatility is lower than 5%, proceed to the next step;

将从内壁面温湿度传感器10-1所读出的温度与相对湿度分别记为T_in与

将从外壁面温湿度传感器10-2所读出的温度与相对湿度分别记为T_out与

数据采集及分析系统11计算得到热湿环境隔离箱内空气水蒸气分压力、墙体内表面水蒸气分压力和墙体外表面水蒸气分压力分别为p_air、p_in和p_out，其计算式为：3) Maintain the previous working condition for a period of time, record the start time as τ ₁ , record the end time as τ ₂ , and record the temperature and relative humidity read from the temperature and humidity sensor 10-3 of the isolation box as T _air with

The temperature and relative humidity read from the inner wall surface temperature and humidity sensor 10-1 are recorded as T in and T _in respectively.

The temperature and relative humidity read from the temperature and humidity sensor 10-2 on the outer wall are denoted as T out and T _out respectively.

The data acquisition and analysis system 11 calculates and obtains the partial pressure of water vapor in the air in the heat-humid environment isolation box, the partial pressure of water vapor on the inner surface of the wall, and the partial pressure of water vapor on the outer surface of the wall as p _air , _pin and p _out respectively. The formula is:

和

and

和

4), due to the extremely small air flow rate in the heat and humidity environment isolation box, the convection of the inner surface of the wall can be carried out according to the European standard EN15026-2007 (heat and humidity performance of building units and building components - evaluation of moisture transfer through numerical simulation). The heat transfer coefficient h is regarded as 4.00W m ^–2 K ^–1 , and according to the Lewis criterion, the convective mass transfer coefficient h _m on the inner surface of the wall is 2.94×10 ^–8 s/m; the data acquisition and analysis system 11 calculates the wall The total heat flux and total mass flux on the surface of the body during this period are Q and Q _m respectively, and their calculation formulas are

and

根据质量守恒，通过墙体的质通量与墙体内表面的质通量Q_m相等，计算得到墙体的湿阻R_m，其计算式为

5), according to energy conservation, the heat flux passing through the wall is equal to the heat flux Q on the inner surface of the wall, and the thermal resistance R of the wall is calculated, and its calculation formula is

According to the conservation of mass, the mass flux through the wall is equal to the mass flux Q _m on the inner surface of the wall, and the moisture resistance R _m of the wall is calculated, and its calculation formula is

6), remove the heat and humidity environment isolation box, remove the temperature and humidity sensor 10-1 on the inner wall and the sealing member 3; install the insulation material replacement module and fill in 4 kinds of insulation materials 9 with the same thickness (such as extruded polystyrene foam board, Polyurethane foam board, etc.), arrange the temperature and humidity sensor 10-4 on the surface of the thermal insulation material at the correct position, and push the heat and humidity environment isolation box to the target position so that it is in close contact with the building wall 100 and forms a relative confined space;

7), repeat steps 2) to 5) to obtain the thermal resistance and moisture resistance of the walls containing different thermal insulation materials, remove the heat and humidity environment isolation box, observe whether condensation occurs on the contact surface of the thermal insulation material 9 and the wall 100, and comprehensively select Suitable insulation material9.

The specific implementation above is only a preferred embodiment of this creation, and is not intended to limit this creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this creation should be included in this creation. within the scope of protection.

Claims (10)

1. The utility model provides a hot wet performance field test system of wall body, its thermal resistance and the wet resistance that can measure building wall body which characterized in that: the system comprises a hot and humid environment isolation box, an air treatment system, a heat insulation material replacement module, a sensor and a data acquisition and analysis system; the hot and wet environment isolation box comprises a box body, a pressure equalizing plate and a sealing component; the box body is positioned on the inner side of the building wall; the pressure equalizing plate is embedded in the box body; the sealing component is arranged between the box body and the building wall; the air treatment system is connected to the hot and humid environment isolation box, and is used for treating air to required temperature and humidity and conveying the air to the hot and humid environment isolation box; the heat-insulating material replacement module is positioned in the hot and humid environment isolation box and is provided with a heat-insulating material; the sensor collects temperature and humidity parameters of the inner and outer surfaces of the wall body and the air environment in the hot and humid environment isolation box in real time and is electrically connected to the data collection and analysis system; and the data acquisition and analysis system collects real-time parameters fed back by the sensors and calculates to obtain the thermal resistance and the wet resistance of the building wall.

2. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the whole box body is a cuboid, the length of the box body is 0.6m, and the cross section of the box body is a square of 2.0m multiplied by 2.0 m; one side of the box body is provided with an opening, and the other five surface shells are composed of a 1.0mm aluminum plate, a 50.0mm polyurethane foam plastic and a 1.0mm aluminum plate which are sequentially arranged; the edge of the shell facing the wall body is provided with a slot, and the sealing component is arranged in the slot; the bottom of the box body is provided with four self-locking universal wheels; the surface of the box body close to the wall body is provided with a plurality of pressure regulating holes.

3. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the pressure equalizing plate is an aluminum plate with the thickness of 1.0mm, is square and has the distance of 0.2m from the inner bottom surface of the box body; the uniform pressure plate is densely distributed with round holes with the diameter of 8.0 mm.

4. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the sealing component is made of silica gel and is in a square annular shape as a whole; the width of the direct contact part of the sealing component and the wall body is 60.0mm; and a plug is arranged at the rear part of the sealing component and connected with the slot.

5. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the air treatment system consists of a filtering heat exchange section, a temperature and humidity treatment section and an airflow power section; a filter is arranged in the filtering heat exchange section; a cooler is arranged in the temperature and humidity treatment section, a heater is arranged behind the cooler, and a humidifier is arranged behind the heater; the air flow force section is internally provided with a circulating fan which drives indoor air to enter the air treatment system and is dissipated into the indoor environment from the pressure regulating hole after flowing through the hot and humid environment isolation box; and the airflow power section is provided with an air pipe connected with the hot and humid environment isolation box.

6. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the heat-insulating material replacement module comprises a heat-insulating material bracket and a silica gel sealing ring; the heat-insulating material bracket is provided with four groove positions; the thermal insulation material can be respectively arranged in the four groove positions.

7. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the whole silica gel sealing ring is in a square ring shape and consists of a front section with a constant sectional area and a rear section with an enlarged sectional area; the front section is hooped on the heat-insulating material bracket, and the expanded section of the rear section is contacted with the wall body.

8. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 1, wherein: the sensors comprise an inner wall surface temperature and humidity sensor, an outer wall surface temperature and humidity sensor, an isolation box temperature and humidity sensor and a thermal insulation material surface temperature and humidity sensor, the measurement ranges are not less than-20.0-60.0 ℃ and 0-100% RH, the accuracy is not less than +/-0.5 ℃ and +/-3% RH, and the measurement frequency is not less than 0.1Hz; the temperature and humidity sensor of the isolation box is simultaneously connected with the temperature and humidity processing section and the data acquisition and analysis system through a connecting wire, and the measured temperature and humidity data are transmitted to the air processing system and the data acquisition and analysis system; the inner wall surface temperature and humidity sensor, the outer wall surface temperature and humidity sensor and the heat insulation material surface temperature and humidity sensor are connected with the data acquisition and analysis system, and measured temperature and humidity data are transmitted to the data acquisition and analysis system.

9. The on-site testing system for the heat and humidity performance of the wall body as recited in claim 8, wherein: the inner wall surface temperature and humidity sensor is arranged in the middle of the inner surface of the wall body in the range of the hot and humid environment isolation box; the outer wall surface temperature and humidity sensor is arranged on the outer surface of the wall body corresponding to the inner wall surface temperature and humidity sensor; the temperature and humidity sensor of the isolation box is arranged at a distance of 100.0mm from the inner surface of the wall body and corresponds to the temperature and humidity sensor on the inner wall surface; the temperature and humidity sensor on the surface of the heat insulation material is arranged at the midpoint of the surface of the heat insulation material, which is in contact with air.

10. A method for selecting a suitable thermal insulation material for a wall, which uses the on-site testing system for the heat and humidity performance of the wall as claimed in any one of claims 1 to 9, the method comprising the following steps:

1) Selecting a building wall testing position, arranging an inner wall surface temperature and humidity sensor, an outer wall surface temperature and humidity sensor and an isolation box temperature and humidity sensor at correct positions, and pushing a hot and humid environment isolation box to a target position to enable the hot and humid environment isolation box to be in close contact with the building wall and form a relatively closed space;

2) Setting the temperature and humidity required by the experiment on an air treatment system, and carrying out the next step when the temperature and humidity in the hot and humid environment isolation box reach a set value and the fluctuation rate is lower than 5% every 10 minutes;

3) Maintaining the last working condition for a period of time, and recording the initial time as tau ₁ And the end time is recorded as tau ₂ The temperature and the relative humidity read from the temperature and humidity sensor of the isolation box are respectively recorded as T _air And with

The temperature and relative humidity read from the temperature and humidity sensor on the inner wall surface are respectively denoted as T _in And with

The temperature and the relative humidity read from the outer wall surface temperature and humidity sensor are respectively recorded as T _out And with

The data acquisition and analysis system calculates that the partial pressure of the air vapor in the heat and humidity environment isolation box, the partial pressure of the water vapor on the inner surface of the wall body and the partial pressure of the water vapor on the outer surface of the wall body are respectively p _air 、p _in And p _out The calculation formula is as follows:

and

4) The convection heat transfer coefficient h of the inner surface of the wall body is regarded as 4.00 W.m ^–2 ·K ^–1 According to the Liuyi standard, the convection mass transfer coefficient h of the inner surface of the wall body _m Is 2.94X 10 ^–8 s/m; the data acquisition and analysis system calculates and obtains the total heat flux and the total mass flux of the inner surface of the wall body in the period of time as Q and Q respectively _m The calculation formula is respectively

And

5) According to the conservation of energy, the thermal resistance R of the wall body is obtained by calculating through the fact that the heat flux of the wall body is equal to the heat flux Q of the inner surface of the wall body, and the calculation formula is

Mass flux through the wall and mass flux Q of the inner surface of the wall according to the conservation of mass _m And (5) equality, calculating to obtain the wet resistance R of the wall _m Which is calculated as

6) Moving out the hot and humid environment isolation box, and removing the temperature and humidity sensor and the sealing member on the inner wall surface; installing a heat insulation material replacement module, filling 4 kinds of heat insulation materials with the same thickness, arranging a temperature and humidity sensor on the surface of the heat insulation material at a correct position, pushing the hot and humid environment isolation box to a target position, enabling the hot and humid environment isolation box to be in close contact with a building wall, and forming a relatively closed space;

7) And (5) repeating the steps 2) to 5) to obtain the thermal resistance and the wet resistance of the wall body containing different heat-insulating materials, moving out the thermal-wet environment isolation box, observing whether the contact surface of the heat-insulating materials and the wall body has a condensation phenomenon, and comprehensively selecting proper heat-insulating materials.

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