CN110927204A - Testing device for thermal performance self-adaptive adjustment wall - Google Patents
Testing device for thermal performance self-adaptive adjustment wall Download PDFInfo
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- CN110927204A CN110927204A CN201910383357.5A CN201910383357A CN110927204A CN 110927204 A CN110927204 A CN 110927204A CN 201910383357 A CN201910383357 A CN 201910383357A CN 110927204 A CN110927204 A CN 110927204A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
Abstract
The invention provides a testing device for a thermal performance self-adaptive adjusting wall, which comprises a first testing unit arranged on the side of a simulated outdoor environment and a second testing unit arranged on the side of a simulated indoor environment, wherein the first testing unit and the second testing unit have the same structure and respectively comprise a ventilation and heat exchange box body, a fan and a working condition setting unit. The fan is arranged on one side of the ventilation heat exchange box body and sends heat exchange airflow into the ventilation heat exchange box body; the working condition setting unit sets different heat exchange working conditions for the heat exchange airflow circulating in the ventilation heat exchange box; the heat exchange verification unit comprises a heat flow sensor arranged on the surface of the wall test piece to be tested, and a first group of temperature sensors and a second group of temperature sensors arranged on the surface of the wall test piece to be tested. The testing device provided by the invention can effectively measure the thermal performance of the wall under different working conditions.
Description
Technical Field
The invention belongs to the technical field of wall performance testing, and particularly relates to a testing device for a wall with self-adaptive thermal performance adjustment.
Background
The wall body is one of the most basic structures of the building envelope structure and is also the key point of building energy conservation. In south China, summer air conditioner energy consumption is a main component of building energy consumption, and air conditioner load can be effectively reduced by means of wall heat dissipation, so that the wall has low thermal resistance. On the contrary, in northern China, winter heating is a main component of building energy consumption, and the heating load can be effectively reduced by improving the thermal resistance of the wall body, so that the wall body has higher thermal resistance. In order to adapt to different thermal performance of walls in different areas, application No. 201510775931.3 discloses a passive solar wall, which comprises a concrete wall with an inner plastering layer and an outer plastering layer, and is characterized in that a heat pipe evaporation section pipe grid is arranged in the outer plastering layer of the concrete wall, a heat pipe condensation section pipe grid is arranged in the inner plastering layer, the heat pipe evaporation section pipe grid is connected with the heat pipe condensation section pipe grid through an intelligent control valve, a heat pipe built-in wall is formed, and the heat transfer coefficient of the wall can be adjusted according to the requirements of winter and summer. The thermal performance of the wall body can be adjusted in a self-adaptive mode, and the difficulty in testing the performance of the wall body is high, so that a testing device for the wall body with the thermal performance capable of being adjusted in the self-adaptive mode is urgently needed to be developed.
Therefore, the invention is very necessary to provide a testing device for a wall body with self-adaptive thermal performance adjustment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a testing device for a wall body with self-adaptive thermal performance adjustment, which comprises a first testing unit and a second testing unit, wherein the first testing unit is arranged on the side of a simulated outdoor environment, the second testing unit is arranged on the side of a simulated indoor environment, the first testing unit and the second testing unit have the same structure and respectively comprise a ventilation and heat exchange box body, and one side of the wall body is included; the fan is arranged on one side of the ventilation heat exchange box body and sends heat exchange airflow into the ventilation heat exchange box body; the working condition setting unit is used for setting different heat exchange working conditions for the heat exchange airflow circulating in the ventilation heat exchange box; the testing unit comprises a ventilation heat exchange box body, a fan, a working condition setting unit and a heat exchange verification unit, different environmental conditions are simulated, and the heat transfer capacity of the wall body under different working conditions can be verified, so that the thermal performance of the wall body is determined.
Preferably, the heat exchange verification unit is arranged on the heat flow sensor on the surface of the wall test piece to be tested, and the first group of temperature sensors and the second group of temperature sensors are arranged on the surface of the wall test piece to be tested.
Preferably, the operating condition setting unit includes:
the heating unit comprises a heating execution unit arranged in the ventilation heat exchange box body and a heating setting unit arranged outside the ventilation heat exchange box body, and the heating setting unit controls the heating quantity of the heating execution unit to the heat exchange air flow;
the cooling unit comprises a cooling execution unit arranged in the ventilation heat exchange box body and a cooling setting unit arranged outside the ventilation heat exchange box body, and the cooling setting unit adjusts the cooling amount of the cooling execution unit to the heat exchange airflow;
the working condition setting unit sets different heat exchange working conditions for heat exchange air flow circulating in the ventilation heat exchange box body through the heating unit and the cooling unit.
Preferably, the heating unit is an electric heating device, wherein the heating execution unit is an electric heater arranged in the ventilation heat exchange box body, the heating setting unit is a voltage regulator arranged outside the ventilation heat exchange box body, and the voltage regulator is connected with the electric heater.
Preferably, the cooling execution unit is a water cooler arranged in the ventilation heat exchange box, the cooling setting unit is a thermostatic water bath arranged outside the ventilation heat exchange box, the thermostatic water bath is communicated with the water inlet end of the water cooler through a water inlet pipeline provided with a regulating valve, and the thermostatic water bath is communicated with the water outlet end of the water cooler through a water outlet pipeline provided with a circulating pump.
Preferably, the cooling unit further comprises a third group of temperature sensors, the third group of temperature sensors are divided into two groups and are respectively arranged on the water inlet pipeline and the water outlet pipeline, a flow meter is further arranged between the temperature sensor of the water inlet pipeline and the regulating valve, and the temperature sensor of the water outlet pipeline is positioned on the water inlet side of the circulating pump.
Preferably, the data collector is connected with the voltage regulator to collect voltage and current output of the voltage regulator; and the data acquisition unit is connected with the third group of temperature sensors and the flowmeter to respectively acquire the water inlet temperature, the water outlet temperature and the water supply flow of the water cooler.
Preferably, the data collector is further connected with an air speed sensor, the first group of temperature sensors and the second group of temperature sensors so as to respectively collect the air speed of the heat exchange airflow and the temperature of the heat exchange airflow in the ventilation heat exchange box body.
Compared with the prior art, the invention has the beneficial effects that:
the invention can verify the heat transfer capacity of the wall under different working conditions by respectively setting the same test units on the two sides of the wall to simulate different environmental conditions through the test device for the wall with the self-adaptive thermal performance regulation, thereby determining the thermal performance of the wall, and being particularly suitable for the performance measurement of the wall with the adjustable thermal performance.
Drawings
FIG. 1 is a schematic structural diagram of a testing device for a thermal performance adaptive adjustment wall according to the present invention;
FIG. 2 is a schematic diagram of arrangement points of a heat flow sensor and a temperature sensor on the outer surface of a wall to be measured;
fig. 3 is a schematic diagram of arrangement points of temperature sensors on the inner surface of the wall to be measured.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example (b):
the present embodiment provides a test apparatus for a thermal performance adaptive adjustment wall, referring to fig. 1, including a first test unit disposed on a simulated outdoor environment side, and a second test unit disposed on a simulated indoor environment side, where the first test unit and the second test unit have the same structure, and both of them include:
and the ventilation heat exchange box A, B is used for containing one side of the wall.
And a fan disposed at an upper/lower side of the ventilation and heat exchange box A, B and feeding a heat exchange air flow into the ventilation and heat exchange box A, B.
And the working condition setting unit is used for setting different heat exchange working conditions for the heat exchange airflow circulating in the ventilation heat exchange box A, B.
Referring to fig. 2 and 3, the present invention further includes a heat exchange verification unit: the heat flow sensors f1, f2 and f3 are arranged on the upper, middle and lower parts of the outer side surface of the wall body, the first group of temperature sensors b1, b2 and b3 are arranged around the heat flow sensors, and the second group of temperature sensors c1, c2 and c3 correspond to the inner side positions of the wall body and are arranged on the inner side of the wall body.
In the scheme, the test units with the same structure, namely the first test unit and the second test unit, are arranged on the two sides of the wall body. Specifically, the method comprises the following steps: firstly, heat exchange airflow is sent into a ventilation heat exchange box A, B through a fan, then, different heat exchange working conditions are set for the heat exchange airflow through a working condition setting unit, namely, the air temperature of the heat exchange airflow is mainly controlled through the working condition setting unit, the air quantity is adjusted through air speed sensors a1 and a2, 9, for example, in the test of simulating the indoor environment side of a wall body, the heat exchange airflow is in a low-temperature state (can be known through a temperature sensor c 2) through the working condition setting unit, and in the test of simulating the outdoor environment side of the wall body, the heat exchange airflow is in a high-temperature state (can be known through a temperature sensor b 2) through the working condition setting; then, the heat exchange verification unit verifies whether the heat exchange airflow in the ventilation heat exchange box A, B absorbs heat to raise the temperature or release heat to lower the temperature (which can be obtained through the temperature sensors b1, b3, c1 and c 3), so as to obtain the heat exchange quantity (based on the air quantity and the temperature difference) of the two sides of the wall, and finally, the heat transfer coefficient of the wall can be calculated through the heat flow sensor and the temperature difference of the two sides of the wall, so that the thermal performance of the wall is determined (see the following analysis specifically).
For the above-mentioned operating mode setting unit, mainly have: the heating unit comprises a heating execution unit and a heating setting unit which are arranged in the ventilation heat exchange box A, B, and the heating setting unit controls the heating quantity of the heating execution unit to the heat exchange air flow; and the cooling unit comprises a cooling execution unit and a cooling setting unit which are arranged in the ventilation heat exchange box A, B, and the cooling setting unit adjusts the cooling amount of the cooling execution unit to the heat exchange air flow. The working condition setting unit sets different heat exchange working conditions for heat exchange airflow circulating in the ventilation heat exchange box A, B through the heating unit and the cooling unit. In other words, the temperature of the air in the ventilation heat exchange box A, B is controlled cooperatively by the heating unit and the cooling unit.
Referring to fig. 1, more specifically, the heating unit is an electric heating device, wherein the heating execution unit is an electric heater (heater in fig. 1) disposed in the ventilation and heat exchange box A, B, the heating setting unit is a voltage regulator disposed outside the ventilation and heat exchange box A, B, and the voltage regulator is connected to the electric heater. The current flowing into the electric heater and the terminal voltage applied to the two ends of the electric heater can be adjusted by the voltage regulator, the power of the electric heater can be obtained according to the voltage and the current, and the heating quantity of the heat exchange air flow by the electric heating device can be obtained by the product of the power and the heating time. The electric heater can be an electric heating coil, and the coil can be electrified to release heat, so that heat exchange airflow contacted with the coil can be heated.
Referring to fig. 1, more specifically, the cooling unit is a water cooling device, wherein the cooling execution unit is a water cooler (a cooler in the figure) disposed in the ventilation and heat exchange box A, B, the cooling setting unit is a thermostatic water bath disposed outside the ventilation and heat exchange box A, B, and the thermostatic water bath is communicated with a water inlet end of the water cooler through a water inlet pipeline provided with a regulating valve and is communicated with a water outlet end of the water cooler through a water outlet pipeline provided with a circulating pump. The water cooler may be a cooling water pipe, and the cooling water is fed into the cooling water pipe to cool the heat exchange air flow contacting with the cooling water pipe. Wherein can adjust the water supply flow who enters into condenser tube according to the governing valve, the circulating pump can let the water that enters into condenser tube flow back to in the thermostatic waterbath to this adjustment water cooler is to the cooling capacity of heat transfer gas flow.
Wherein the cooling unit further comprises a third set of temperature sensors d1, d2 and e1, e2, which are respectively arranged on the water inlet pipeline (d1, e1) and the water outlet pipeline (d2, e2), wherein a flow meter is further arranged between the temperature sensor of the water inlet pipeline and the regulating valve, and the second temperature sensor of the water outlet pipeline is positioned on the water inlet side of the circulating pump, as shown in fig. 1. The flow of water supply on the water inlet pipeline after the water supply device is arranged through the regulating valve can be measured through the flowmeter, the temperature of cooling water when the cooling water enters and exits the water cooler can be obtained through the third group of temperature sensors, and the cooling capacity of the water cooler for heat exchange air flow can be obtained according to the water supply flow and the temperature difference of the inlet and the outlet.
Therefore, in the above-mentioned working condition setting unit of the present invention, the heating unit and the cooling unit are mainly adjusted in a combined manner so as to enable the heat exchange airflow in the ventilation heat exchange box A, B to have a low temperature state or a high temperature state. Because the heating capacity of the heating unit and the cooling capacity of the cooling unit can be known through data acquisition, the difference of the heat and cold capacity or the difference of the heat and cold capacity of the heat exchange air flows on the two sides of the wall body can be known.
As a preferred embodiment of the present invention, the testing device for adaptively adjusting thermal performance of a wall further includes a data collector. The data collector is connected with the voltage regulator to collect voltage and current output of the voltage regulator, so that the heating power of the electric heater is obtained, and the heating quantity of the electric heater to the heat exchange airflow is further known; and the data acquisition unit is connected with the third group of temperature sensors and the flowmeter to acquire the water inlet temperature, the water outlet temperature and the water supply flow of the water cooler respectively so as to obtain the cooling capacity of the water cooler for the heat exchange airflow. Meanwhile, the data acquisition unit is also connected with a wind speed sensor and a first group and a second group of temperature sensors, and fig. 1 is a schematic structural diagram of the testing device for the thermal performance self-adaptive adjustment wall body.
In summary, in the testing device for the wall body with the self-adaptive adjustment of the thermal performance, firstly, the ventilation heat exchange box bodies A, B are respectively arranged on the two sides of the wall body; an air heater and a cooler are arranged in the ventilation heat exchange box A, B; the air heater is an electric heating device, and the heating quantity is controlled by a pressure regulator; the air cooler is a water cooling device, cooling water is prepared by constant-temperature water bath, and the cooling effect is controlled by adjusting the water temperature and the flow; the air heater and the air cooler coordinate to control the air temperature in the ventilation box body; the frequency of a blower is changed or an air valve is arranged to regulate the air quantity; according to the voltage and the current of the electric heater, the water supply flow and the inlet and outlet temperature of the cooler, the method can be used for checking the heat exchange quantity of two sides of the wall; the heat transfer coefficient of the wall body can be calculated through the heat flow sensor attached to the surface of the wall body and the temperature difference between the two sides of the wall body; through the adjustment of the temperature and the wind speed in the ventilation box body, a plurality of working conditions can be set for determining the heat transfer performance of the wall body under variable working conditions, so that the thermal performance of the wall body under different working conditions can be determined.
The testing device of the invention is based on the fact that the heat exchange working condition adjusting conditions are respectively set on the two sides of the wall body for the thermal performance self-adaptive adjustment, namely, an air heating and cooling adjusting device is arranged in the ventilation heat exchange box A, B, and the air temperature in the box (namely, a working condition setting unit) is adjusted and controlled. Furthermore, the ventilation and heat exchange box A, B is provided with a fan for frequency conversion or an air valve for adjusting and changing the circulation air speed, and the convection and heat exchange conditions are adjusted. The other key point is that the heat transfer coefficient of the wall body is determined according to the reading of the heat flow sensor and the temperature difference of two sides of the wall body.
The heat transfer coefficient is calculated by the formula: r ═ Δ t/q ═ Δ t/(C × E); k is 1/R;
wherein: r-the thermal resistance of the wall test piece; m2 k/w
Delta t-temperature difference of two sides of the wall test piece; c
q-heat flow
C-calibrating coefficients of the heat flow meter; w/m2 mvv
E-electromotive force (heat flow meter reading); mv
K-heat transfer coefficient; w/m2
The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.
Claims (8)
1. A testing device for a thermal performance self-adaptive adjusting wall body is characterized in that: including setting up the first test unit in simulation outdoor environment side and setting up the second test unit in simulation indoor environment side, first test unit and second test unit have the same structure, and all include: the ventilation heat exchange box body encloses one side of the wall body; the fan is arranged on one side of the ventilation heat exchange box body and sends heat exchange airflow into the ventilation heat exchange box body; the working condition setting unit is used for setting different heat exchange working conditions for the heat exchange airflow circulating in the ventilation heat exchange box; the testing unit comprises a ventilation heat exchange box body, a fan, a working condition setting unit and a heat exchange verification unit, different environmental conditions are simulated, and the heat transfer capacity of the wall body under different working conditions can be verified, so that the thermal performance of the wall body is determined.
2. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the heat exchange verification unit is arranged on a heat flow sensor on the surface of the wall test piece to be tested and a first group of temperature sensors and a second group of temperature sensors on the surface of the wall test piece to be tested.
3. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the operating condition setting unit includes:
the heating unit comprises a heating execution unit arranged in the ventilation heat exchange box body and a heating setting unit arranged outside the ventilation heat exchange box body, and the heating setting unit controls the heating quantity of the heating execution unit to the heat exchange air flow;
the cooling unit comprises a cooling execution unit arranged in the ventilation heat exchange box body and a cooling setting unit arranged outside the ventilation heat exchange box body, and the cooling setting unit adjusts the cooling amount of the cooling execution unit to the heat exchange airflow;
the working condition setting unit sets different heat exchange working conditions for heat exchange air flow circulating in the ventilation heat exchange box body through the heating unit and the cooling unit.
4. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the heating unit is an electric heating device, wherein the heating execution unit is an electric heater arranged in the ventilation heat exchange box body, the heating setting unit is a voltage regulator arranged outside the ventilation heat exchange box body, and the voltage regulator is connected with the electric heater.
5. The apparatus for testing the wall with the adaptive adjustment of thermal performance as claimed in claim or above, wherein the cooling performing unit is a water cooler disposed in the ventilation and heat exchange box, the cooling setting unit is a thermostatic water bath disposed outside the ventilation and heat exchange box, and the thermostatic water bath is communicated with a water inlet end of the water cooler through a water inlet pipeline provided with an adjusting valve and is communicated with a water outlet end of the water cooler through a water outlet pipeline provided with a circulating pump.
6. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the cooling unit further comprises a third group of temperature sensors, the third group of temperature sensors are divided into two temperature sensors which are respectively arranged on the water inlet pipeline and the water outlet pipeline, a flow meter is further arranged between the temperature sensor of the water inlet pipeline and the regulating valve, and the temperature sensor of the water outlet pipeline is positioned on the water inlet side of the circulating pump.
7. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the data acquisition unit is connected with the voltage regulator to acquire the voltage and current output of the voltage regulator; and the data acquisition unit is connected with the third group of temperature sensors and the flowmeter to respectively acquire the water inlet temperature, the water outlet temperature and the water supply flow of the water cooler.
8. The testing device for the wall body with the thermal performance adaptive adjustment function according to claim 1, wherein the testing device comprises: the data collector is also connected with the wind speed sensor, the first group of temperature sensors and the second group of temperature sensors so as to respectively collect the wind speed of the heat exchange airflow and the temperature of the heat exchange airflow in the ventilation heat exchange box body.
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2019
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Application publication date: 20200327 |