CN106018470A - Device and method for testing dynamic heat transfer process of building wall - Google Patents

Abstract

The invention discloses a testing device and method for a dynamic heat transfer process of a building wall, which includes a box system, a computer, an instrument monitoring system, and the like. The box system is used to realize the dynamic and steady-state heat transfer process test of the wall at the same time according to the test conditions input by the user; the computer and instrument monitoring system is used to set the test conditions and realize the heat transfer process of the wall. Control and adjust, collect data such as temperature, heat flow, and electric heating power in the heat transfer process in real time, intelligently analyze the heat transfer process and thermal performance of the wall according to the preset calculation criteria, and automatically generate heat transfer process analysis reports. Not only can the detection function of the wall heat transfer coefficient in the steady state heat transfer process be realized, but also the dynamic heat transfer process of the wall in different cities and different types of building environments can be simulated and tested, and the thermal performance and thermal process of the wall can be intelligently analyzed. Provide different wall structures for different indoor environment control requirements, and provide a theoretical basis for the formulation of relevant standards.

Description

Device and method for testing dynamic heat transfer process of building wall

technical field

The invention belongs to the technical field of testing the thermal performance of building walls, in particular to a heat transfer testing system.

Background technique

At present, China is in a critical period of accelerating industrialization, urbanization, and new rural construction. Construction, industry, and transportation have become the three major industries of energy use, and are also important sources of greenhouse gas emissions. In 2009, my country's building energy consumption reached 717 million tons of standard coal, accounting for 23.39% of the total energy consumption of the whole society. According to the conventional development mode of developed countries, the proportion of my country's building energy consumption in the total energy consumption can reach 35%. Since the energy saving of building enclosure structures can reach about 25%, the state has successively promulgated many energy-saving design standards for public buildings and residential buildings, respectively making thermal performance parameters such as heat transfer coefficient, thermal resistance, and thermal inertia indicators of enclosure structures. strictly regulated. Therefore, the external wall is the main component of the building envelope, and the importance of optimizing the thermal performance of the wall for building energy conservation cannot be underestimated.

Early studies on the thermal performance of building walls at home and abroad were only limited to stable conditions, that is, natural conditions or continuous air-conditioning and heating operation modes, and the building energy-saving design and inspection and acceptance standards issued by the country and the industry all use the heat transfer coefficient K, thermal resistance R and thermal inertia index D and other parameters to measure and evaluate the thermal performance of the wall. In recent years, with the rapid increase in the utilization rate of air-conditioning and heating equipment, the energy consumption of buildings has increased rapidly, and intermittent air-conditioning and heating operation modes have also emerged with the appeal of building energy conservation, the use of rooms and the differences in personnel behavior patterns. In addition, walls exhibit different thermal properties under different climatic conditions. For example, the heat transfer characteristics of walls in hot summer and cold winter regions are significantly different from the one-way heat transfer characteristics of thermal insulation exterior walls in severe cold regions. The thermal performance design of the wall in cold regions should not only satisfy good heat insulation during the day and good heat dissipation at night in summer, but also take into account good heat preservation in winter. Therefore, the thermal performance of the wall under the intermittent air-conditioning operation mode cannot be measured and evaluated only by the traditional thermal performance parameters.

The detection indicators of existing domestic wall thermal performance testing equipment mainly include heat transfer coefficient K, thermal resistance R, etc. The detection methods mainly include heat flow meter method, hot box method, hot box-heat flow meter method, constant power plane heat source method And infrared thermal imaging camera method, these detection equipment are carried out under the condition of steady state heat transfer of the wall. For example: the existing technology discloses a simple structure and wide applicability on-site detection device for the heat transfer coefficient of the enclosure structure, which can improve the temperature uniformity and stability of the measured part, but the detection conditions are limited to the steady-state heat transfer process. The thermal performance of the wall in a dynamic thermal environment cannot be tested. The purpose of the present invention is to provide a testing device and method that can realize the dynamic and steady-state heat transfer process of the building wall at the same time for different climatic conditions and air-conditioning operation modes, intelligently analyze the thermal performance of the wall and its thermal process, and provide different indoor Different wall structures are provided for environmental control requirements, providing a theoretical basis for the formulation of building energy conservation standards in relevant countries and industries.

Contents of the invention

The purpose of the present invention is to solve different climatic conditions and air-conditioning operation mode, provide a kind of building wall dynamic heat transfer process testing device, it is characterized in that: comprise test piece frame (1), protective hot box (3), cold box (5) ) and control systems;

The test piece frame (1) is a rectangular frame; the protective heat box (3) and the cold box (5) are both hollow cuboids with one side open, and the two are fastened to the sides of the test piece frame (1) respectively. Both sides, form a closed space; In the middle of the rectangular frame is the wall body test piece (2) to be tested; The wall body test piece (2) divides the closed space into two spaces; the protective heat box ( 3) There is a metering heat box (4) and a protective box refrigeration and heating system (10) inside; the metering heat box (4) is a hollow cuboid with one side open, and its opening is fastened to the wall test piece (2 ) surface; the space inside the cold box (5) is a cooling space, the space inside the metering hot box (4) is a heating space, and the space between the metering hot box (4) and the protective hot box (3) The space between is heat insulation space;

The cold box (5) has a cold box deflector (6) and a cold box refrigeration and heating system (8); the cold box deflector (6) is parallel to the surface of the wall test piece (2); One end of the cold box deflector (6) is fixed on the inner wall of the cold box (5); the cold box refrigeration and heating system (8) cools or heats the air in the cold box (5);

The metering hot box (4) has a hot box deflector (7) and an electric heating wire (9); the hot box deflector (7) is parallel to the surface of the wall test piece (2); the heat One end of the box deflector (7) is fixed on the inner wall of the metering hot box (4); the heating wire (9) heats the air inside the metering hot box (4); the protective box cooling and heating system (10) Cool or heat the air between the metering hot box (4) and the protective hot box (3);

The control system regulates the temperature of the cooling space, the heating space and the heat insulation space by controlling the cold box refrigeration and heating system (8), the heating wire (9) and the protection box refrigeration and heating system (10);

The number of material layers of the wall specimen (2) is m layers, and m+3 temperature measuring point layers are set, among which, m-1 measuring point layers are located between each layer of wall materials, and 2 measuring point layers are respectively located at The surface of both sides of the wall specimen (2); the two measuring point layers are respectively located inside the metering hot box (4) and the cold box (5), and these two measuring point layers are close to the surface of the wall specimen (2) (ie A thin layer of air close to the surface of the wall in the two boxes).

Further, the cold box refrigeration and heating system (8) regulates the temperature of the refrigeration space by circulating cold air or hot air;

The cooling and heating system (10) of the protection box is located outside the protection heat box (3), and controls the temperature of the heat insulation space by circulating cold or hot air.

Further, several circulation fans (11) are arranged inside the heat insulation space.

Based on the above-mentioned device, the test method for the steady state and dynamic heat transfer process of the building wall disclosed by the present invention:

1. The test method for the steady-state heat transfer process of building walls includes the following steps:

1) Preparation before the test: make the wall specimen (2), fix it in the specimen frame (1), assemble the protective heat box (3), the metering heat box (4) and the cold box (5);

2) Perform a "steady state" heat transfer test: the user sets the constant temperature T _c of the cold box (5), the constant temperature T _h of the metering hot box (4) and the protective hot box (3);

3) Data monitoring transmission:

If the "steady state" heat transfer test is carried out, after the heat transfer process reaches a steady state, the electric heating power Q _P of the metering heat box (4) is collected;

4) "Steady state" heat transfer test data analysis:

After the steady-state heat transfer process reaches a steady state (that is, each measuring point layer including T _h and T _c does not change), a stable temperature field is formed in the hot and cold boxes on both sides of the specimen; The heater power _QP (i.e. the power of the heating wire (9)) is the heat Q1 transferred through the test piece (the heat loss _{Q3 on} the outer wall of the metering heat box and the unbalanced heat flow _Q2 of the test piece are ignored);

The calculation formula of the wall heat transfer coefficient K in the steady state heat transfer process is as follows:

$\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}}{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>}$

In the formula, Q _P is the electric heating power of the metering hot box, F is the metering area (manually input by the user), T _h is the constant temperature of the metering hot box, and T _C is the constant temperature of the cold box.

2. The test method for the dynamic heat transfer process of building walls includes the following steps:

1) Preparation before the test: make the wall specimen (2), fix it in the specimen frame (1), assemble the protective heat box (3), the metering heat box (4) and the cold box (5);

2) "Dynamic" heat transfer test or heat transfer process test:

User-set cold box (5) temperature dynamic setting data set (Set a temperature value every other Δτ, and gradually heat up or cool down between every two set values. The set of these temperature values constitutes ), metering hot box (4) and protective hot box (3) temperature dynamic setting data set (Set a temperature value every other Δτ, and gradually heat up or cool down between every two set values. The set of these temperature values constitutes ), set the time interval of working condition change as Δτ, the test time as τ, and the test process is divided into n=τ/Δτ time periods on average. data set and The expression of is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

In the formula, is the average temperature of the air in the cold box at the time point iΔτ; is the average temperature of the metering hot box and the protective hot box at the time point iΔτ;

During the heat transfer test, set several temperature or heat flow measuring point layers, each temperature or heat flow measuring point layer has 9 measuring points, and each measuring point is equipped with a temperature sensor or heat flow sensor; suppose the wall specimen (2) The number of material layers is m layers, and m+3 temperature measuring point layers are set, among which m-1 measuring point layers are respectively located between each layer of wall material, and 2 measuring point layers are respectively located at the wall specimen (2) On both sides of the surface, the two measuring point layers are respectively located in the metering hot box (4) and the cold box (5) close to the surface of the wall specimen (2) (that is, the air thin layer close to the wall surface in the two boxes), the said The temperature sensor is used for real-time measurement of each temperature measuring point layer; A _C represents the air temperature of the cold box, A ₁ represents the surface temperature of the cold side of the wall, {A _j } (j=2,..., m, m≥2) represents the wall The temperature of the contact layer of each material of the body, A _m+1 represents the surface temperature of the hot side of the wall, and A _H represents the air temperature of the metering hot box;

Heat flow measuring point layers are arranged on both sides of the wall specimen (2), and the heat flow sensors are used for real-time measurement of each heat flow measuring point layer; the high-precision electric energy meter is used to measure the electric heating power Q _P of the hot box (4) Real-time measurement of ; B _C , B _H respectively represent the surface heat flow of the cold side of the wall and the heat flow of the surface of the hot side of the wall;

3) Data monitoring transmission:

The collection time interval of temperature or heat flow measurement points is Δτ, that is, each measurement point collects n=τ/Δτ data within the test time τ, and the distribution layers of temperature measurement points are A _C , A ₁ , A _j , A _m+1 , The data monitored by _{A H} are represented by temperature matrix T _C , T ₁ , T _j , T _{m+1 , T H} respectively; Q _H to represent, each matrix expression is as follows:

Among the various formulas, T _C , T ₁ , T _j , T _m+1 , _TH , Q _C , and Q _H are all matrices with 9 rows and n columns; t _C,ki , t _1,ki , t _j,ki , t _m+1,ki , t _H,ki , q _C,ki (the air transfer from the wall surface to the cold box is positive), q _H,ki (the air transfer from the hot box to the wall surface is positive) respectively represent the kth The temperature or heat flow value of the row i column, that is, the temperature or heat flow value of the kth measuring point iΔτ time point;

4) Data analysis:

①Dynamic heat transfer temperature and heat flow distribution:

The temperature matrix T _C monitored by the temperature measuring point distribution layer A _C calculates the arithmetic average of the temperature values of the 9 measuring points on each column to obtain That is, the average temperature of the air in the cold box at the time point iΔτ, the expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 9</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; 9</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

Cold box air temperature distribution dataset The expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

Similarly, the distribution data sets of the surface temperature of the cold side of the wall, the temperature of the contact layer of each material of the wall, the surface temperature of the hot side of the wall, the air temperature of the metering hot box, the heat flow of the cold side of the wall, and the heat flow of the hot side of the wall are respectively The expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; ;</span>\mathrm{<span\; class="notranslate">\; j</span>}$

$\begin{array}{c}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; ...</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>\end{array}$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

of all kinds, are the average temperature of the cold box air temperature, the average surface temperature of the cold side of the wall, the average temperature of the contact layer of each material of the wall, the average surface temperature of the hot side of the wall, the average air temperature of the metering hot box, and the average temperature of the wall surface at the time point iΔτ. The average heat flow on the cold side of the body and the average heat flow on the hot side of the wall.

② Wall heat transfer analysis.

During the dynamic heat transfer process of the wall, the heat transferred through the cold side surface of the wall is W _C (the transfer from the wall surface to the air in the cold box is positive), and the heat transferred through the hot side surface of the wall is W _H (measurement of the air in the hot box transfer to the wall surface is positive), the expression is as follows:

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; \&tau;</span>}$

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; \&tau;</span>}$

In the formula, F is the measurement area (square area in the center of the wall); Δτ is the time interval of heat flow collection; is the average heat flow on the cold side of the wall at the time point iΔτ; is the average heat flow on the hot side surface of the wall at the time point iΔτ.

③ Wall heat storage analysis.

During the entire test process, the heat storage W _X of the wall specimen is the difference in heat transfer through the surfaces on both sides of the wall, and the expression is as follows:

W _X ＝W _H -W _C

④Temperature wave attenuation multiple and delay time.

During the propagation of the temperature wave in the wall, it will be damped by the wall material on the temperature wave. Therefore, as the heat transfer process progresses, the peak of the temperature wave will attenuate and delay.

Attenuation multiple v calculation formula:

$\mathrm{<span\; class="notranslate">\; v</span>}<span\; class="notranslate">\; =</span>\frac{{<span\; class="notranslate">\; (</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; x</span>}}}{{<span\; class="notranslate">\; (</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; x</span>}}}$

In the formula, is the maximum moment value for measuring the average temperature of the hot box air, is the maximum moment value of the average value of the surface temperature on the cold side of the wall.

The delay time ξ is the difference between the maximum moment of the mean value of the air temperature of the metering hot box and the maximum moment of the mean value of the surface temperature of the cold side of the wall.

Technical effect of the present invention is beyond doubt:

1. Simple structure and convenient operation. The invention has simple structure, clear and effective monitoring system and strong applicability. Users can independently input dynamic or steady-state test conditions according to their needs. The temperature control intelligent instrument monitoring system will intelligently adjust the air temperature of the hot and cold boxes on both sides of the test piece according to the test condition information, and transmit the monitored test data to The computer client performs intelligent analysis and calculation, which saves the huge workload brought by manual analysis and calculation.

2. Real-time monitoring and display. During the testing process, the temperature control intelligent instrument monitoring system of the present invention can realize real-time measurement and monitoring of parameters such as temperature, heat flow, electric heating power, etc., and display the monitored data in real time on the built-in display screen, which is convenient for users to clearly and intuitively Understand the test status, find and solve problems in time.

3. Realize dynamic heat transfer test. The invention can realize the test of the dynamic and steady-state heat transfer process of the building wall at the same time for different climatic conditions and air-conditioning operation modes, and intelligently analyze the thermal performance and thermal process of the wall body.

The invention can be widely used in the dynamic and steady-state heat transfer process testing of building walls, intelligently analyze the thermal process and thermal characteristics of the wall, provide different wall structures for different indoor environment control requirements, and provide a theoretical basis for the formulation of relevant standards .

Description of drawings

Fig. 1 is a schematic structural view of "a device and method for testing a dynamic heat transfer process of a building wall" according to the present invention.

Fig. 2 is a layout diagram (Z-Z section) of the temperature or heat flow measurement points of "a device and method for testing the dynamic heat transfer process of building walls" of the present invention.

detailed description

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

Example 1:

This embodiment discloses a test method for the steady-state heat transfer process of a building wall, and the specific test process is as follows:

(1) Preparation before the test. Make the wall body test piece (2) on site, and use the clamping device (12) to fix it between the hot and cold boxes to perform the wall body heat transfer test. The user enters the constant temperature value T _c of the cold box (5), the constant temperature value T _h of the metering hot box (4) and the protective hot box (3) in the computer client (15) (and T _h -T _c ≥ 20°C) , as a steady-state heat transfer test case.

(2) Heat transfer process test. After the user inputs the test working condition, the working condition data is imported to the temperature control intelligent instrument monitoring system (13) through the data transmission line (16), which controls the environmental conditions in the hot and cold boxes on both sides of the wall specimen (2). During the steady-state heat transfer test, the high-precision electric energy meter is used to measure the real-time measurement of the electric heating power Q _P of the hot box (4).

(3) Data monitoring and transmission. When the heat transfer process reaches a steady state, the temperature control intelligent instrument monitoring system (13) transmits the monitored electric heating power Q _P of the metering heat box (4) to the computer client (15) through the data transmission line (16).

(4) Data analysis. The computer client (15) calculates the heat transfer coefficient of the wall according to the preset calculation criteria, and automatically generates a steady-state heat transfer process analysis report. The calculation formula of the wall heat transfer coefficient K in the steady state heat transfer process is as follows:

$\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}}{\mathrm{<span\; class="notranslate">\; f</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>}$

In the formula, Q _P is the electric heating power of the metering hot box, F is the metering area (manually input by the user), T _h is the constant temperature of the metering hot box, and T _c is the constant temperature of the cold box.

Example 2:

This embodiment discloses a test method for the dynamic heat transfer process of a building wall, and the specific test process is as follows:

(1) Preparation before the test. Make the wall body test piece (2) on site, and use the clamping device (12) to fix it between the hot and cold boxes to perform the wall body heat transfer test. The user inputs the temperature dynamic setting data set of the cold box (5) in the computer client (15) Metering hot box (4) and protective hot box (3) temperature dynamic setting data set Set the time interval of working condition change as Δτ, and the test time as τ, so the test process is divided into n=τ/Δτ time periods on average. data set and The expression of is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

In the formula, is the average temperature of the air in the cold box at the time point iΔτ; is the average temperature of the metering hot box and the protective hot box at the time point iΔτ.

(2) Heat transfer process test. After the user inputs the test working condition, the working condition data is imported to the temperature control intelligent instrument monitoring system (13) through the data transmission line (16), which controls the environmental conditions in the hot and cold boxes on both sides of the wall specimen (2). During the dynamic heat transfer test, the temperature sensor is used for real-time measurement of each temperature measurement point; the heat flow sensor is used for real-time measurement of each heat flow measurement point. Assuming that the number of wall material layers is m layers, as shown in Figure 1, the temperature measuring point distribution layer numbers A _C , A ₁ , A _j , A _m+1 , A _H (j=2,..., m, m≥2 ) respectively represent the air temperature of the cold box, the surface temperature of the cold side of the wall, the temperature of the contact layer of _each material of the wall, the surface temperature of the hot side of the wall, and the air _temperature of the metering hot box; Surface heat flow on the cold side of the body and heat flow on the hot side of the wall. There are 9 measuring points in each temperature or heat flow distribution layer, and the layout of the measuring points is shown in Figure 2 (ZZ section).

(3) Data monitoring and transmission. The acquisition time interval of the temperature or heat flow measurement points is Δτ, so each measurement point collects n=τ/Δτ data within the test time τ. The temperature control intelligent instrument monitoring system (13) displays the monitored temperature and heat flow data on the display screen (14) in real time, and transmits the data to the computer client (15) through the data transmission line (16). The data monitored by temperature measuring point distribution layers A _C , A ₁ , A _j , A _m+1 , and A _H are represented by temperature matrices T _C , T ₁ , T _j , T _m+1 , and T _H respectively; The data monitored by point distribution layers B _C and B _H are represented by heat flow matrices Q _C and Q _H respectively, and the expressions of each matrix are as follows:

Among the various formulas, T _C , T ₁ , T _j , T _m+1 , _TH , Q _C , and Q _H are all matrices with 9 rows and n columns; t _C,ki , t _1,ki , t _j,ki , t _m+1,ki , t _H,ki , q _C,ki (the air transfer from the wall surface to the cold box is positive), q _H,ki (the air transfer from the hot box to the wall surface is positive) respectively represent the kth The temperature or heat flow value of the row i column, that is, the temperature or heat flow value of the kth measuring point iΔτ time point.

(4) Data analysis. The computer client (15) intelligently analyzes and calculates the dynamic heat transfer temperature and heat flow distribution, wall heat transfer analysis, wall heat storage analysis, temperature wave attenuation multiple and delay time according to the preset calculation criteria, and automatically generates the dynamic heat transfer Thermal process analysis report.

①Dynamic heat transfer temperature and heat flow distribution:

According to the data monitored by the temperature and heat flow measuring points, the distribution of temperature and heat flow during the dynamic heat transfer process of the wall can be obtained. For example: for the temperature matrix T _C monitored by the temperature measuring point distribution layer A _C , calculate the arithmetic average of the temperature values of the 9 measuring points on each column to obtain That is, the average temperature of the air in the cold box at the time point iΔτ, the expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 9</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; 9</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

Therefore, the cold box air temperature distribution dataset The expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

Similarly, the distribution data sets of the surface temperature of the cold side of the wall, the temperature of the contact layer of each material of the wall, the surface temperature of the hot side of the wall, the air temperature of the metering hot box, the heat flow of the cold side of the wall, and the heat flow of the hot side of the wall are respectively The expression is as follows:

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; ;</span>\mathrm{<span\; class="notranslate">\; j</span>}$

$\begin{array}{c}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; ...</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>\end{array}$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \{</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; ,</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>$

of all kinds, are the average temperature of the cold box air temperature, the average surface temperature of the cold side of the wall, the average temperature of the contact layer of each material of the wall, the average surface temperature of the hot side of the wall, the average air temperature of the metering hot box, and the average temperature of the wall surface at the time point iΔτ. The average heat flow on the cold side of the body and the average heat flow on the hot side of the wall.

② Wall heat transfer analysis:

During the dynamic heat transfer process of the wall, the heat transferred through the cold side surface of the wall is W _C (the transfer from the wall surface to the air in the cold box is positive), and the heat transferred through the hot side surface of the wall is W _H (measurement of the air in the hot box transfer to the wall surface is positive), the expression is as follows:

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; \&tau;</span>}$

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; f</span>}\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; \&tau;</span>}$

In the formula, F is the measurement area (manually input by the user); Δτ is the time interval of heat flow collection; is the average heat flow on the cold side of the wall at the time point iΔτ; is the average heat flow on the hot side surface of the wall at the time point iΔτ.

③ Wall heat storage analysis:

During the entire test process, the heat storage W _X of the wall specimen is the difference in heat transfer through the surfaces on both sides of the wall, and the expression is as follows:

W _X ＝W _H -W _C

④Temperature wave attenuation multiple and delay time:

During the propagation of the temperature wave in the wall, it will be damped by the wall material on the temperature wave. Therefore, as the heat transfer process progresses, the peak of the temperature wave will attenuate and delay.

Attenuation multiple v calculation formula:

$\mathrm{<span\; class="notranslate">\; v</span>}<span\; class="notranslate">\; =</span>\frac{{<span\; class="notranslate">\; (</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; x</span>}}}{{<span\; class="notranslate">\; (</span>\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; A</span>}\mathrm{<span\; class="notranslate">\; x</span>}}}$

In the formula, is the maximum moment value for measuring the average temperature of the hot box air, is the maximum moment value of the average value of the surface temperature on the cold side of the wall.

The delay time ξ is the difference between the maximum moment of the mean value of the air temperature of the metering hot box and the maximum moment of the mean value of the surface temperature of the cold side of the wall.

Claims (5)

1. a construction wall dynamic heat transfer procedural test device, it is characterised in that: include test specimen frame (1), protective hot box (3), Ice chest (5) and control system；

Described test specimen frame (1) is rectangle frame；Described protective hot box (3) and ice chest (5) they are all the hollow cuboids that one side is uncovered, two Person is fastened on the both sides of described test specimen frame (1) respectively, forms one and closes space；It is body of wall to be tested in the middle of described rectangle frame Test specimen (2)；Two spaces are split in described closing space by described body of wall test specimen (2)；Described protective hot box (3) is internal has one Metering hot tank (4) and protective housing freeze and heating system (10)；Described metering hot tank (4) is the hollow cuboid that one side is uncovered, Its uncovered surface being fastened on body of wall test specimen (2)；The space of described ice chest (5) inside is refrigeration space, described metering hot tank (4) Internal space is for heating space, and the space between described metering hot tank (4) and protective hot box (3) is insulated space；

Described ice chest (5) freezes and heating system (8) with ice chest flow guiding screen (6) and ice chest；Described ice chest flow guiding screen (6) is parallel Surface in body of wall test specimen (2)；The inwall of ice chest (5) is fixed in one end of described ice chest flow guiding screen (6)；Described ice chest refrigeration and Heating system (8) is to the air cooling in ice chest (5) or heating；

Described metering hot tank (4) is with hot tank flow guiding screen (7) and heating wire (9)；Described hot tank flow guiding screen (7) is parallel to body of wall examination The surface of part (2)；The inwall of metering hot tank (4) is fixed in one end of described hot tank flow guiding screen (7)；Described heating wire (9) is to meter The air heating that calorimetric case (4) is internal；Described protective housing refrigeration and heating system (10) are to metering hot tank (4) and protective hot box (3) air cooling between or heating；

Described control system is freezed and heating system by controlling ice chest refrigeration and heating system (8), heating wire (9) and protective housing (10), described refrigeration space, the temperature that heats space and insulated space are regulated and controled；

Body of wall test specimen (2) number of layers is m layer, arranges m+3 temperature point layer, and wherein, m-1 measuring point layer lays respectively at every layer Between materials for wall；2 measuring point layers lay respectively at the both side surface of body of wall test specimen (2)；2 measuring point layers lay respectively at metering hot tank (4) and ice chest (5) is internal, the two measuring point layer is near body of wall (2) surface.

A kind of construction wall dynamic heat transfer procedural test device and method the most according to claim 1, it is characterised in that: institute State ice chest refrigeration and heating system (8) carries out temperature adjusting by circulation cold air or hot blast to refrigeration space；

It is outside that described protective housing refrigeration and heating system (10) are positioned at protective hot box (3), by circulation cold air or hot blast to heat insulation Space carries out temperature adjusting.

A kind of construction wall dynamic heat transfer procedural test device and method the most according to claim 1, it is characterised in that: institute State insulated space several circulating fans of internal layout (11).

4. a construction wall steady state heat transfer procedural test method based on device described in 1～3 any one claim, it is special Levy and be, comprise the following steps:

1) prepare before test: make body of wall test specimen (2), be fixed in test specimen frame (1), assembled good protective hot box (3), metering Hot tank (4) and ice chest (5)；

2) " stable state " heat transfer testing is carried out: user sets ice chest (5) temperature constant value T_c, metering hot tank (4) and protective hot box (3) Temperature constant value T_h；

3) data monitoring transmission:

If carrying out " stable state " heat transfer testing, after diabatic process reaches steady statue, gather the electrical heating power Q of metering hot tank (4)_P；

4) " stable state " heat transfer testing data analysis:

(T is i.e. included after steady state heat transfer process reaches steady statue_hAnd T_cNo longer change at interior each measuring point layer), test specimen both sides Steady temperature field is formed in cool and hot box；Electric heater capacity Q according to input metering hot tank_P, it is the heat transmitted by test specimen Amount Q₁；

The wall heat transfer coefficient K computing formula of steady state heat transfer process is as follows:

$K=\frac{Q_P}{F(T_h-T_c)}$

In formula, Q_PFor measuring the electrical heating power of hot tank, F is metering area (user is manually entered), T_hPermanent for metering heater temperature Definite value, T_cIce chest temperature constant value.

5. a construction wall dynamic heat transfer procedural test method based on device described in 1～3 any one claim, it is special Levy and be, comprise the following steps:

1) prepare before test: make body of wall test specimen (2), be fixed in test specimen frame (1), assembled good protective hot box (3), metering Hot tank (4) and ice chest (5)；

2) " dynamically " heat transfer testing or diabatic process test:

User sets ice chest (5) temperature dynamic setting data collection(set a temperature value every a Δ τ, each two setting value it Between gradually heat up or lower the temperature, the set of these temperature values is constituted), metering hot tank (4) and protective hot box (3) temperature dynamic set Given data collection(set a temperature value every a Δ τ, gradually heat up between each two setting value or lower the temperature, these temperature values Set is constituted), setting working conditions change time interval as Δ τ, the testing time is τ, and test process is divided into n=τ/Δ τ in equal size The individual time period.Data setWithExpression formula as follows:

$\stackrel{\&OverBar;}{T_C}=\{\stackrel{\&OverBar;}{t_{C1}},\stackrel{\&OverBar;}{t_{C2}},...\stackrel{\&OverBar;}{t_{Ci}}...,\stackrel{\&OverBar;}{t_{Cn}}\},(i=1,2,...,n)$

$\stackrel{\&OverBar;}{T_H}=\{\stackrel{\&OverBar;}{t_{H1}},\stackrel{\&OverBar;}{t_{H2}},...\stackrel{\&OverBar;}{t_{Hi}}...,\stackrel{\&OverBar;}{t_{Hn}}\},(i=1,2,...,n)$

In formula,Ice chest air themperature meansigma methods for i Δ τ time point；Metering hot tank and protective hot for i Δ τ time point Case air themperature meansigma methods；

During heat transfer testing, several temperature or Heat flow site layer, each temperature or Heat flow site layer are set and are 9 measuring points, Each measuring point arranges a temperature sensor or heat flow transducer；Assume that body of wall test specimen (2) number of layers is m layer, arrange m+3 Temperature point layer, wherein m-1 measuring point layer lays respectively between every layer of materials for wall, and 2 measuring point layers lay respectively at body of wall test specimen (2) both side surface, 2 measuring point layers lay respectively at metering hot tank (4) and close body of wall test specimen (2) surface of ice chest (5), described temperature Degree sensor is for the real time measure of each temperature point layer；A_CRepresent ice chest air themperature, A₁Represent body of wall cold side surface temperature, {A_j(j=2 ..., m, m >=2) represent body of wall each material layer temperature, A_m+1Represent body of wall hot side surface temperature, A_HRepresent meter Calorimetric case air themperature；

Both side surface at body of wall test specimen (2) arranges Heat flow site layer, and described heat flow transducer is for the reality of each Heat flow site layer Shi Jiliang；High-precision electric energy meter is used for measuring hot tank (4) electrical heating power Q_PReal time measure；B_C、B_HRepresent the cold side of body of wall respectively Surface heat flow, body of wall hot side surface hot-fluid；

3) data monitoring transmission:

The acquisition time of temperature or Heat flow site is spaced apart Δ τ, and the most each measuring point gathers n=τ/Δ τ number in testing time τ According to, temperature point distribution layer A_C、A₁、A_j、A_m+1、A_HThe data monitored use temperature matrices T respectively_C、T₁、T_j、T_m+1、T_HRepresent； Heat flow site distribution layer B_C、B_HThe data monitored are respectively with hot-fluid matrix Q_C、Q_HRepresenting, each matrix expression is as follows:

In various, T_C、T₁、T_j、T_m+1、T_H、Q_C、Q_HIt it is all the matrix of 9 row n row；t_C,ki、t_1,ki、t_j,ki、t_m+1,ki、t_H,ki、q_C,ki (surface of wall is just to the transmission of ice chest air), q_H,ki(metering hot tank air is just to surface of wall transmission) represents kth respectively The temperature of row i row or heat flow value, the i.e. temperature of kth measuring point i Δ τ time point or heat flow value；

4) data analysis:

1. dynamic heat transfer temperature and heat flux distribution:

Temperature point distribution layer A_CThe temperature matrices T monitored_C, ask arithmetic mean to obtain 9 measuring point temperature values on its every string ArriveThe ice chest air themperature meansigma methods of i.e. i Δ τ time point, expression formula is as follows:

$\stackrel{\&OverBar;}{t_{Ci}}=\frac{t_{C,1i}+t_{C,2i}+...+t_{C,9i}}{9},(i=1,2,...,n)$

Ice chest air themperature distributed data collectionExpression formula is as follows:

$\stackrel{\&OverBar;}{T_C}=\{\stackrel{\&OverBar;}{t_{C1}},\stackrel{\&OverBar;}{t_{C2}},...\stackrel{\&OverBar;}{t_{Ci}}...,\stackrel{\&OverBar;}{t_{Cn}}\},(i=1,2,...,n)$

Similarly, body of wall cold side surface temperature, body of wall each material layer temperature, body of wall hot side surface temperature, Metering hot tank air themperature, body of wall cold side surface hot-fluid, the distributed data collection of body of wall hot side surface hot-fluid are respectivelyExpression formula is as follows:

$\stackrel{\&OverBar;}{T_1}=\{\stackrel{\&OverBar;}{t_{11}},\stackrel{\&OverBar;}{t_{12}},...\stackrel{\&OverBar;}{t_{1i}}...,\stackrel{\&OverBar;}{t_{1n}}\},(i=1,2,...,n)$

$\stackrel{\&OverBar;}{T_j}=\{\stackrel{\&OverBar;}{t_{j1}},\stackrel{\&OverBar;}{t_{j2}},...\stackrel{\&OverBar;}{t_{ji}}...,\stackrel{\&OverBar;}{t_{jn}}),(i=1,2,...,n;j$

$\begin{array}{c}\stackrel{\&OverBar;}{T_{m+1}}=\{\stackrel{\&OverBar;}{t_{(m+1)1}},\stackrel{\&OverBar;}{t_{(m+1)2}},...\stackrel{\&OverBar;}{t_{(m+1)i}}...,\stackrel{\&OverBar;}{t_{(m+1)n}}\},(i\\ =1,2,\mathrm{...},n)\end{array}$

$\stackrel{\&OverBar;}{T_H}=\{\stackrel{\&OverBar;}{t_{H1}},\stackrel{\&OverBar;}{t_{H2}},...\stackrel{\&OverBar;}{t_{Hi}}...,\stackrel{\&OverBar;}{t_{Hn}}\},(i=1,2,...,n)$

$\stackrel{\&OverBar;}{Q_C}=\{\stackrel{\&OverBar;}{q_{C1}},\stackrel{\&OverBar;}{q_{C2}},...\stackrel{\&OverBar;}{q_{Ci}}...,\stackrel{\&OverBar;}{q_{Cn}}\},(i=1,2,...,n)$

$\stackrel{\&OverBar;}{Q_H}=\{\stackrel{\&OverBar;}{q_{H1}},\stackrel{\&OverBar;}{q_{H2}},...\stackrel{\&OverBar;}{q_{Hi}}...,\stackrel{\&OverBar;}{q_{Hn}}\},(i=1,2,...,n)$

In various,It is respectively the ice chest Air Temperature of i Δ τ time point Degree meansigma methods, body of wall cold side surface temperature averages, body of wall each material layer temperature averages, body of wall hot side surface temperature are put down Average, metering hot tank air themperature meansigma methods, body of wall cold side surface hot-fluid meansigma methods, body of wall hot side surface hot-fluid meansigma methods.

2. wall heat transfer component analysis.

During body of wall dynamic heat transfer, it is W by the heat of body of wall cold side surface transmission_C(surface of wall to the transmission of ice chest air is Just), the heat by the transmission of body of wall hot side surface is W_H(metering hot tank air is just to surface of wall transmission), expression formula is such as Under:

$W_C=F\underset{i=1}{\overset{n}{\&Sigma;}}\stackrel{\&OverBar;}{q_{Ci}}\mathrm{\&Delta;}\mathrm{\&tau;}$

$W_H=F\underset{i=1}{\overset{n}{\&Sigma;}}\stackrel{\&OverBar;}{q_{Hi}}\mathrm{\&Delta;}\mathrm{\&tau;}$

In formula, F is metering area；Δ τ is hot-fluid acquisition time interval；Body of wall cold side surface hot-fluid for i Δ τ time point Meansigma methods；Body of wall hot side surface hot-fluid meansigma methods for i Δ τ time point.

3. body of wall amount of stored heat is analyzed.

In whole test process, body of wall test specimen amount of stored heat W_XBeing through the difference of body of wall both side surface heat output, expression formula is such as Under:

W_X=W_H-W_C

4. temperature ware damping number and time delay.

Temperature wave, can be by the materials for wall damping action to temperature wave in the communication process of body of wall, therefore along with conducting heat The carrying out of journey, there is decay and delay phenomenon in the crest of temperature wave.

Attenuation multiple v computing formula:

$v=\frac{{\left(\stackrel{\&OverBar;}{t_{Hi}}\right)}_{MAX}}{{\left(\stackrel{\&OverBar;}{t_{1i}}\right)}_{MAX}}$

In formula,For measuring the maximum moment value of hot tank air themperature meansigma methods,For the cold side of body of wall The maximum moment value of surface temperature meansigma methods.

Time delay, ξ was maximum moment and the maximum of body of wall cold side surface temperature averages of metering hot tank air themperature meansigma methods The difference in moment.