CN101576519A - Outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building - Google Patents
Outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building Download PDFInfo
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- CN101576519A CN101576519A CNA200910053157XA CN200910053157A CN101576519A CN 101576519 A CN101576519 A CN 101576519A CN A200910053157X A CNA200910053157X A CN A200910053157XA CN 200910053157 A CN200910053157 A CN 200910053157A CN 101576519 A CN101576519 A CN 101576519A
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Abstract
The invention discloses an outdoor dynamic testing method for heat-insulation property of heat-insulation coating at the outer wall of a building, comprising the steps of: placing a test board containing a protective hot box on a rotating disc capable of rotating by 360 degrees; placing a testing box body and a reference box body in the protective hot box; manufacturing a testing wall body adhered with the heat-insulation coating on the testing surface of the testing box body, and manufacturing a reference wall body adhered with the reference coating on the testing surface of the reference box body; regulating and controlling the interior temperature of the testing box body, the reference box body and the protected hot box to be 24 DEG C; regulating and controlling the internal surfaces of the surfaces of the testing box body and the reference box body to be less than 0.3m/s; and obtaining the heat-insulation property of the heat-insulation coating. The testing method takes the effects of solar radiation into consideration, can test and analyze the effect of the heat-insulation coating on the building energy consumption, and can obtain an accurate measurement result for the heat engineering performance of the wall body or the roofing under practical winter and summer climatic conditions.
Description
Technical field
The present invention relates to the building thermal technique technical field of performance test, relate in particular to a kind of outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building.
Background technology
Current, developed countries such as the U.S. and Germany have developed the reflective heat-insulation paint that is used for encaustic tile and roofing in succession on the basis of aviation and special coating such as military, have certain reflectivity and energy-saving efficiency.Existing insulating moulding coating roughly can be divided into following 3 classes according to mechanism:
(1) barrier insulating moulding coating, this is that a kind of hindrance function that transmits by heat is realized heat insulation passive cooling coating.Generally adopt the composition of low heat conductivity or in filming, introduce the extremely low air of thermal conductivity, to obtain good effect of heat insulation.The silicate compound heat-insulation coating (GB/T17371-1998) of making inorganic heat insulation aggregate with sepiolite, vermiculite, crushed crude pearlite etc. is typical barrier insulating moulding coating.
(2) selective thermal reflective heat-insulation paint, this is a kind of based on reflected sunlight near infrared passive cooling coating partly.Be made up of ultraviolet light, visible light and near infrared light the solar radiation that can receive on earth, aggregate energy is 700kcal/m2, and wavelength region may is 0.2～2.5 μ m, and wherein ultraviolet light accounts for 2.5%, and visible light accounts for 44.3%, and near infrared light accounts for 53%.Visible light and near infrared high reflectance are reduced the heat accumulation of solar radiation by reflectance coating.
(3) radiation heat insulation coating, this be a kind of by forms of radiation absorb sunshine light and heat with certain wavelength emission in atmospheric window, reach heat-insulating cooling effect with active cool-down method.This coating has been used military infrared technique, improves the high emission effect of coating at λ=0.3～1.35 μ m and λ=8～13.5 mu m wavebands, and its performance evaluation parameter is an emissivity.
The insulating moulding coating that belongs to novel energy-saving building materials for this kind, the heat insulation means of testing of existing building exterior wall heat preserving is mainly measured heat transfer coefficient with the hot case method in laboratory, can't consider the influence of solar radiation, therefore can't test and analyze the influence of insulating moulding coating to building energy consumption, it in the winter time need be by a large amount of outdoor actual measurement acquisitions to the change of body of wall or roofing thermal property under the actual weather conditions in summer.
Summary of the invention
The purpose of this invention is to provide a kind of outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building, can't test and analyze the problem of insulating moulding coating the influence of building energy consumption to solve present method of testing.
Technical scheme of the present invention is that a kind of outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building is characterized in that, may further comprise the steps:
Put protective hot box on can the rotating disk of 360 ° of rotations;
Put test casing and reference casing in described protective hot box;
On described test box body test surfaces, make the test body of wall that adheres to described insulating moulding coating, on described reference casing test surfaces, make the reference body of wall that adheres to reference coating;
Regulate and control described test casing and reference casing and described protective hot the temperature inside the box to 24 ℃;
Regulate and control described test casing and reference casing test surfaces inside surface wind speed less than 0.3 meter per second;
Obtain the heat-proof quality of described insulating moulding coating.
The test body of wall of making on described test casing is to adhere to described insulating moulding coating on the structural clay tile wall, and the reference body of wall of making on described reference casing is the common coating that adheres on the structural clay tile wall as reference coating.
Described protective hot box material is a polyurethane, and the thickness of casing is 10 centimetres.
Described test casing and reference casing length are 2 meters, and width is 2 meters, highly are 2.4 meters.
At described test casing and reference casing antetheca the length of side being arranged is 1.5 meters square openings, is used for making test body of wall and reference body of wall.
At the antetheca of described protective hot box the length of side being arranged is 1.5 meters square openings, is used for making the test body of wall.
At described test casing and reference casing and described protective hot box refrigeration plant and well heater are installed all, this refrigeration plant is used for distribute heat, and this well heater is used for the balance heat.
At described test casing and each wall of reference casing by the angular direction being arranged evenly the trace that heat flow meter is measured by wall conducts heat.
At described test casing and each wall of reference casing by the angular direction being arranged evenly thermopair measures wall surface temperature.
Measure the total solar radiation intensity of test surfaces at the disposed outside total solar radiation meter of described test casing and reference casing test surfaces.
Measure test surfaces outside outside air temperature at the disposed outside air thermometer of described test casing and reference casing test surfaces.
Each wall at described test casing and reference casing conducts heat by the trace that angular direction 2 heat flow meters of even layout are measured by wall.
Each wall of testing casing and reference casing and described sample casing at described reference is by angular direction 9 thermopairs of even layout are measured wall surface temperature.
The invention has the beneficial effects as follows, the method of testing that provides has been considered the influence of solar radiation, can the test analysis insulating moulding coating to the influence of building energy consumption, also can obtain test result accurately for body of wall or roofing thermal property under the actual weather conditions in summer in the winter time.
Description of drawings
Fig. 1 is the proving installation planimetric map of the method for testing member that provides in one embodiment of the invention
Fig. 2 is the proving installation stereographic map of the method for testing member that provides in one embodiment of the invention
Fig. 3 is the test surfaces total solar radiation intensity that obtains in an one embodiment of the invention test variation diagram in time
Fig. 4 is passing through of obtaining in one embodiment of the invention test hot-fluid that test surfaces and reference surface import casing into a variation diagram in time
Fig. 5 is the test coating that obtains in an one embodiment of the invention test and reference coating surface temperature and outdoor temperature variation diagram in time
Fig. 6 is that the test surfaces and the reference surface effective heat transfer coefficient that obtain in one embodiment of the invention test are schemed over time
Embodiment
The specific embodiment of the present invention is, puts protective hot box on can the rotating disk of 360 ° of rotations; Test casing and reference casing all the other five faces except that test surfaces place protective hot box; On described test casing and reference casing test surfaces, make test and reference foundation wall and test and reference sample; Regulate and control described test casing and reference casing and described protective hot the temperature inside the box to 24 ℃; Regulate and control described test casing and reference casing test surfaces inside surface wind speed less than 0.3 meter per second; Under actual outdoor conditions, obtain the thermal and insulating performance of described sample.
Described protective hot box material is a polyurethane, and the thickness of casing is 10 centimetres.The length of described test casing and reference casing is 2 meters, and width is 2 meters, highly is 2.4 meters.At described test casing and reference casing antetheca the length of side being arranged is 1.5 meters square openings, is used for making test foundation wall and insulating moulding coating and reference foundation wall and reference coating.At described test casing and reference casing and described protective hot box refrigeration plant and well heater are installed all, this refrigeration plant is used for distribute heat, and this well heater is used for the balance heat.Conduct heat by the trace that angular direction 2 heat flow meters of even layout are measured by wall at described test casing and each wall of reference casing.At described test casing and each wall of reference casing by the angular direction being arranged evenly 2 thermopairs measure wall surface temperature.Measure the total solar radiation intensity of test surfaces at the disposed outside total solar radiation meter of described test casing and reference casing test surfaces.Measure test surfaces outside outside air temperature at the disposed outside air thermometer of described test casing and reference casing test surfaces.
Member proving installation figure as depicted in figs. 1 and 2 according to the method described above.Do not have buildings to stop test light near the requirement, can both shine test board from being raised to the sunset sun day.Whole test board is positioned on the rotating disk, and rotating disk can 360 ° of rotations by driven by motor.Test board is made up of two test casings and reference casing, protective hot box, the cold water unit of a typhoon, measurement and an opertaing device and other utility appliance.Wherein, protective hot box is mainly used to test casing and reference casing and environment isolation, thereby reduces the heat transfer of test casing and reference casing and environment.The material selection polyurethane of casing, its heat-insulating property and intensity can both meet the demands.Casing thickness is 10cm.(hole of 1.5m * 1.5m) is used to make foundation wall and insulating moulding coating to leave one at test casing and reference casing antetheca.When test, protective hot box remains on 24 ℃ jointly with test casing and reference spin manifold temperature, removes test surfaces in theory, and test casing and all the other each faces of reference casing do not have heat transfer capacity substantially with the external world.(2m * 2m * 2.4m) is mainly used in test for test casing and reference casing.Antetheca leaves the hole the same with protective hot box.Be separately installed with a typhoon coiler unit and an electric heater in test casing and the reference casing, fan coil is used for taking away the heat in the room, and electric heater is used for the heat in the balance room.In order to make measurement result more accurate, testing casing and each wall of reference casing simultaneously by the angular direction being arranged evenly the trace that heat flow meter is measured by wall conducts heat.Simultaneously for understanding the homogeneity of wall surface temperature, at test casing and each wall of reference casing by the angular direction having been arranged evenly thermopair measures wall surface temperature.Heating radiator adopts the wind-cooled cold-water unit, is positioned at a jiao of test board.Move under the different weather condition for satisfying test, the wind-cooled cold-water unit is selected the compressor of two parallel connections for use, only need operation one compressor generally speaking, to get heat more and when temperature can not be controlled at setting value in the casing, two compressors moved simultaneously when solar radiation.The wind-cooled cold-water unit is equally applicable to the operation of test in winter, only needs operation fan coil and electrical heating earlier, and the circulating water temperature of handpiece Water Chilling Units is brought up to more than 8 ℃, and unit just can move automatically.Because test is carried out in the process, return water temperature remains unchanged substantially, so unit can not shut down because of low-temperature protection.
Main measurement instrument quantity of test board and precision thereof are shown in table 1,2.
Main measurement instrument of table 1 test board and quantity thereof
The main measurement instrument precision of table 2 test board
The precision of three phase electrical parameters general measuring instrument is meant the error when electric flux is accumulated to 1kWh.
Wherein all place a platinum resistance in protective hot box and each test casing and the reference casing and be used to measure spin manifold temperature, then temperature signal is passed to controller, controller is controlled the solid-state relay break-make by comparing and measuring temperature value and set temperature value, thereby control electric heater start-stop reaches the purpose of stablizing room temperature.Two other platinum resistance is used to measure the import and export water temperature of fan coil in test casing and the reference casing.Electromagnetic flowmeter survey discharge is installed on test casing and reference casing fan coil inlet ductwork simultaneously.Choose 9 different test points placement thermopairs at test casing and reference box house, be used for guaranteeing that in the process of carrying out of test the box house temperature is even.Since relatively low to the requirement of protective hot box temperature homogeneity, so only place 3 thermopairs.For improving the precision of test, each test casing and reference cabinet wall are used to measure the trace of testing casing and reference casing and protective hot box and environment with 2 heat flow meters and conduct heat.Three phase electrical parameters general measuring instrument and power transducer are measured the power of power consumption of electrical heating accumulative total and blower fan respectively.In addition, a whole set of Portable Automatic Weather Station of outdoor placement is used to measure outdoor temperature humidity, wind speed, wind direction etc.
Needing before on-test test box is demarcated, mainly is with test box production standard body of wall (the standard heat preservation and insulation is known).Start TT﹠C system then, make test carry out guaranteeing to test casing and reference casing and protective hot the temperature inside the box in the process and remain on 24 ℃, the each point thermocouple measurement temperature difference is in 0.5 ℃.Control test specimen inside surface wind speed simultaneously less than 0.3m/s.The gap of compare test case test value and theoretical standard value under the state is calibrated then at the scene.After demarcating end, on test casing and reference casing, make foundation wall and insulating moulding coating.Select the higher weather of intensity of solar radiation that sample is tested.
Based on the heat balance principle, for test casing and reference casing, under airtight situation, the heat transfer capacity of specimen can be calculated by following formula:
Q
s＝Q
fc-Q
f-Q
s-Q
wall-Q
l (1)
Wherein: Q
Fc=cm Δ T (2)
Q
window＝KAΔT (4)
In following formula, Q
SBe the actual heat transfer capacity of test body of wall, the W of unit;
Q
FcBe fan coil heat exchange quantity, the W of unit;
Q
fBe power of fan, the W of unit;
Q
eBe the electrical heating amount, the W of unit;
Q
WallBe the wall heat transfer amount, the W of unit;
Q
lBe each wall leaking heat, the W of unit;
The heat transfer capacity of the specimen that is obtained by formula (1) can calculate the effective heat transfer coefficient K under the actual dynamic situation
Eff
K
eff＝Q
S/(T
e-T
i) (5)
T
eBe outside air temperature, unit ℃
T
iBe indoor air temperature, unit ℃
According to table 2, formula (1)～(4) and test data analysis as can be known, the error effect of handpiece Water Chilling Units import and export water temperature difference is bigger.So in that the test box timing signal need be controlled at the discharge of handpiece Water Chilling Units under the smaller steady state (SS), simultaneously the error of out temperature is debugged error in the same way, can effectively reduce the influence that outlet water temperature difference error is brought like this.
Below, just the heat-proof quality of a kind of insulating moulding coating of test under outdoor conditions specifically describes its process and effect.
After carrying out necessary demarcation, on the test casing, make the structural clay tile wall and added insulating moulding coating, on the reference casing, make the structural clay tile wall and added common coating, to test-21 days on the 19th March in 2008, Fig. 3～6 are the experimental test result.
As seen from Figure 4, see through heat flux that the test body of wall imports the test box house into and change very significantly round the clock, its variation tendency is consistent with the variation (Fig. 3) of intensity of solar radiation.And insulating moulding coating and common exterior coating reach equal difference slightly at night by day, and along with the raising of intensity of solar radiation, its effect of heat insulation begins to manifest gradually, and hot-fluid changed maximum when the strongest and outdoor temperature of solar noon sun radiation was the highest.
The surfaces externally and internally temperature that Fig. 5 has shown the test body of wall over time.Can see that the exterior surface of wall temperature that scribbles insulating moulding coating is lower than common exterior coating, reduce the sun so by day and got and intercepted indoor temperature at night hot the time and outwards transmit.
Can obtain testing the effective heat transfer coefficient K (being the U value) of body of wall according to formula (5), as Fig. 6, the isolation-type insulating moulding coating is lower slightly more about about 10% than the effective heat transfer coefficient of common exterior coating, and building energy conservation is had certain contribution.
Claims (13)
1, a kind of outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building is characterized in that, may further comprise the steps:
Put protective hot box on can the rotating disk of 360 ° of rotations;
Put test casing and reference casing in described protective hot box;
On described test box body test surfaces, make the test body of wall that adheres to described insulating moulding coating, on described reference casing test surfaces, make the reference body of wall that adheres to reference coating;
Regulate and control described test casing and reference casing and described protective hot the temperature inside the box to 24 ℃;
Regulate and control described test casing and reference casing test surfaces inside surface wind speed less than 0.3 meter per second;
Obtain the heat-proof quality of described insulating moulding coating.
2, outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall of building as claimed in claim 1, it is characterized in that, the test body of wall of making on described test casing is to adhere to described insulating moulding coating on the structural clay tile wall, and the reference body of wall of making on described reference casing is the common coating that adheres on the structural clay tile wall as reference coating.
According to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that 3, described protective hot box material is a polyurethane, the thickness of casing is 10 centimetres.
According to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that 4, described test casing and reference casing length are 2 meters, width is 2 meters, highly is 2.4 meters.
According to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that 5, at described test casing and reference casing antetheca the length of side being arranged is 1.5 meters square openings, is used for making test body of wall and reference body of wall.
According to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that 6, at the antetheca of described protective hot box the length of side being arranged is 1.5 meters square openings, is used for making the test body of wall.
7, according to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, at described test casing and reference casing and described protective hot box refrigeration plant and well heater are installed all, this refrigeration plant is used for distribute heat, and this well heater is used for the balance heat.
8, according to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, at described test casing and each wall of reference casing by the angular direction being arranged evenly the trace that heat flow meter is measured by wall conducts heat.
9, according to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, at described test casing and each wall of reference casing by the angular direction being arranged evenly thermopair measures wall surface temperature.
10, according to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, measure the total solar radiation intensity of test surfaces at the disposed outside total solar radiation meter of described test casing and reference casing test surfaces.
11, according to claim 1 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, measure test surfaces outside outside air temperature at the disposed outside air thermometer of described test casing and reference casing test surfaces.
12, as described in the claim 8 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that, at each wall of described test casing and reference casing by the angular direction being arranged evenly the trace that 2 heat flow meters are measured by wall conducts heat.
13, as described in the claim 9 for outdoor dynamic testing method for heat-insulation property of heat-insulation coating at outer wall, it is characterized in that each wall of testing casing and reference casing and described sample casing at described reference is by angular direction 9 thermopairs of even layout are measured wall surface temperature.
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