Spray-type light-transmitting roof light and heat performance detection device and detection method

Abstract

The present invention belongs to the technical field of photothermal performance detection of building envelope structures, and specifically is a spray-type light-transmitting roof photothermal performance detection device and its detection method. The spray-type light-transmitting roof photothermal performance detection device of the present invention comprises: an external environment simulation device, including an external environment box, an artificial light source, and the artificial light source is installed in the external environment box; a light-transmitting roof test piece is installed at the lower side wall of the external environment box; a spray device, including a nozzle, and the nozzle is located below the artificial light source and above the light-transmitting roof test piece; a heat metering device, including a heat metering box and a plurality of detection sensors; a supply and return air system, which is used to circulate airflow into the heat metering device; a supply and return water system, which is used to supply water to the supply and return air system; a control system, which is used to control the external environment simulation device, the heat metering device, the supply and return air system, the supply and return water system and the spray device. The present invention can accurately evaluate the photothermal performance of a light-transmitting roof under spray conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of light and heat performance detection of building envelope structures, and specifically is a spray-type light-transmitting roof light and heat performance detection device and a detection method thereof. Background Art

[0002] The translucent roof is a type of building roof whose main purpose is to provide natural lighting. Due to its advantages such as no obstruction, good visual effects and light load, it is widely used in large public buildings such as airports and commercial complexes.

[0003] Although translucent roofs can effectively improve the indoor natural lighting environment and reduce the lighting energy consumption of buildings, they have a significant negative impact on the indoor thermal environment due to their special thermal properties. In order to improve the indoor thermal environment and reduce the energy consumption of air conditioning, spray-type translucent roofs with auxiliary spray systems came into being, thus achieving the "three wins" goal of roof cooling, shading and lighting. Although there are currently methods for detecting the solar heat gain coefficient (SHGC) of translucent envelope structures using a detection device for the solar heat gain coefficient (SHGC) of translucent envelope structures, the above methods and devices are not suitable for evaluating the photothermal performance of translucent roofs under spray conditions. Summary of the invention

[0004] In view of this, the present invention provides a spray-type light-transmitting roof light-thermal performance detection device and a detection method thereof, which are used to solve the technical problem that the prior art cannot accurately evaluate the light-thermal performance of the light-transmitting roof under spray conditions.

[0005] In a first aspect, the present invention provides a spray-type light-transmitting roof light and heat performance detection device, comprising:

[0006] The external environment simulation device comprises an external environment box and an artificial light source, wherein the artificial light source is installed in the external environment box;

[0007] A light-transmitting roof test piece is installed at the lower side wall of the external environment box, and the light-transmitting roof test piece is located below the artificial light source;

[0008] A spray device, comprising a nozzle, wherein the nozzle is located below the artificial light source and above the light-transmitting roof test piece;

[0009] A heat metering device, comprising a heat metering box and a plurality of detection sensors, wherein the heat metering box is located below the light-transmitting roof test piece;

[0010] Supply and return air system, used to circulate air flow to the heat metering device;

[0011] The water supply and return system is used to supply water to the air supply and return system;

[0012] Control system, used to control external environment simulation device, heat metering device, supply and return air system, supply and return water system and spray device.

[0013] In a second aspect, the present invention provides a method for detecting the light and thermal performance of a spray-type light-transmitting roof, which is detected using the spray-type light-transmitting roof light and thermal performance detection device described in the first aspect, and the method comprises:

[0014] Get preset experimental requirements;

[0015] Determine the artificial light source control parameters according to the preset experimental requirements;

[0016] Controlling the operation of the artificial light source according to the artificial light source control parameters;

[0017] Control the water supply and return system to circulate water to the air supply and return system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the light-transmitting roof test piece;

[0018] Obtain the average radiation intensity on the outer surface of the light-transmitting roof test piece under spray conditions, the average illumination received on the outer surface of the light-transmitting roof test piece, and the thermal parameters of the air supply and return system, water supply and return system, heat metering box, test piece frame and light-transmitting roof test piece;

[0019] The light and heat performance of the spray-type light-transmitting roof is calculated according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters.

[0020] Beneficial effects: The device and method for detecting the light and thermal performance of a spray-type light-transmitting roof of the present invention can accurately simulate the environmental conditions of different boundary conditions and different steady-state meteorological conditions and dynamic meteorological conditions under the spray condition through the external environment simulation device and the spray device, and accurately detect the light and thermal performance of the spray-type light-transmitting roof under the above conditions through the heat metering device, so that the solar radiation intensity received by the surface of the light-transmitting enclosure structure under the spray condition can be accurately measured, and the light and thermal performance of the spray-type light-transmitting roof under different boundary conditions can also be monitored and evaluated. The present invention also uses the water supply and return system and the air supply and return system to quickly stabilize the temperature in the heat metering box within a preset range, thereby further improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0022] Figure 1 It is a front view of the spray-type light-transmitting roof light and heat performance detection device of the present invention;

[0023] Figure 2 It is a top view of the spray-type light-transmitting roof light and heat performance detection device of the present invention;

[0024] Figure 3 It is a schematic diagram of the process of the method for detecting the light and heat performance of the spray-type light-transmitting roof of the present invention;

[0025] Figure 4 A schematic flow chart of a method for determining artificial light source control parameters according to experimental requirements in the present invention;

[0026] Figure 5 A fitting curve of the average radiation intensity of the outer surface of the light roof test piece of the present invention and the output radiation intensity of the artificial light source;

[0027] Figure 6 is a relationship diagram between the hourly solar radiation intensity value and the corresponding hourly setting value of the artificial light source of the present invention;

[0028] Figure 7 It is a flow chart of the method for obtaining various detection parameters in the present invention;

[0029] Figure 8 It is a flow chart of a method for calculating the index of light and heat performance of a spray-type light-transmitting roof in the present invention;

[0030] Fig. 9 This is a graph showing the light and heat performance test results of the spray-type light-transmitting roof under the boundary conditions of Example 1 in the present invention;

[0031] Fig.10 This is a graph showing the light and heat performance test results of the spray-type light-transmitting roof under the boundary conditions of Example 2 in the present invention.

[0032] Parts and their numbers in the picture:

[0033] External environment box 11, artificial light source 12, light-transmitting roof test piece 20, spray water supply pipe 31, nozzle 32, heat metering box 41, collector 42, air conditioner 51, air supply pipeline 52, air supply outlet 53, return air outlet 54, fan 55, air supply grille 56, return air grille 57, water supply pipeline 61, return water pipeline 62, water pump 63, valve 64, water supply temperature sensor 601, return water temperature sensor 602, flow meter 603, first temperature sensor 501, second temperature sensor 502, air inlet temperature sensor 503, first light source radiation intensity sensor 101, second light source radiation intensity sensor 102, first illumination sensor 103, third light source radiation intensity sensor 401, second illumination sensor 402. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in combination with the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a spray-type light-transmitting roof light and thermal performance detection device, which mainly includes: an external environment simulation device, a light-transmitting roof test piece 20, a heat metering device, a supply and return air system, a supply and return water system, a spray device and a spray system.

[0037] The external environment simulation device is used to simulate various meteorological conditions outside the light-transmitting roof, including but not limited to different steady-state meteorological conditions and different dynamic meteorological conditions. The external environment simulation device in this embodiment mainly includes an external environment box 11 and an artificial light source 12, and the artificial light source 12 is installed in the external environment box 11;

[0038] The artificial light source 12 is used to simulate solar radiation. The artificial light source 12 uses a light source whose spectrum is close to the solar spectrum, such as a xenon lamp, and the light of the artificial light source 12 is as parallel and uniform as possible. In addition, the intensity of solar radiation simulated by the artificial light source 12 can be adjusted within a range of 0 to 1000 W / m 2In this embodiment, the cross-sectional dimensions of the external environment box 11 are 2.5 m×2.5 m, and the parameter adjustment range is: wind speed 0.5~10 m / s, temperature 10~40°C, relative humidity 40%~98%. A hole is provided on the lower side wall of the external environment box 11, and the light-transmitting roof test piece 20 to be tested can be installed;

[0039] The light-transmitting roof test piece 20 is installed at the lower side wall of the external environment box 11, and the light-transmitting roof test piece 20 is located below the artificial light source 12;

[0040] The spray device in this embodiment includes a nozzle 32, and the nozzle 32 is located below the artificial light source 12 and above the light-transmitting roof test piece 20;

[0041] The nozzle 32 is used to spray the light-transmitting roof test piece 20 from above the light-transmitting roof test piece. After the artificial light source 12 is turned on, it irradiates the light-transmitting roof test piece 20 from above the spray, thereby accurately simulating the scene when sunlight irradiates the light-transmitting roof under the spray condition, laying a foundation for the subsequent accurate detection of the photothermal performance of the spray-type light-transmitting roof.

[0042] The heat metering device is used to detect the amount of heat gained indoors by solar radiation through the light-transmitting roof test piece. The heat metering device in this embodiment mainly includes a heat metering box 41 and a plurality of detection sensors. The heat metering box 41 is located below the light-transmitting roof test piece 20.

[0043] In specific implementation, the heat metering box 41 is located directly below the light-transmitting roof test piece 20 to be tested, and a collector 42 with a pure black surface and a solar radiation absorption coefficient greater than 0.95 is installed.

[0044] The air supply and return system is connected to the heat metering device. The air supply and return system in this embodiment is used to circulate airflow to the heat metering device, and the air temperature in the heat metering box 41 is quickly stabilized in a preset range by controlling the wind speed, temperature, humidity and other parameters of the air supply and return system. The parameter adjustment range is: wind speed 0.5~10m / s temperature 18~26℃, relative humidity 55%~65%.

[0045] The size of the heat metering box 41 can be set to 2.5m×2.5m×1.0m. Such a size makes the volume small, which is conducive to the supply and return air system to quickly stabilize its temperature.

[0046] The water supply and return system is used to circulate water for the supply and return air system. The water provided by the water supply and return system to the supply and return air system can exchange heat with the supply and return air system to control the temperature of the air supplied by the supply and return air system. The water supply and return system is connected to the supply and return air system.

[0047] The control system of this embodiment is used to control the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return system, and the spray device. In specific implementation, corresponding control modules can be set for the environment simulation device, the heat metering device, the air supply and return system, the water supply and return system, and the spray device to control them. The control system is electrically connected to the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return system, and the spray device.

[0048] The air supply and return system includes an air conditioner 51, an air supply duct 52, an air supply port 53, a return air port 54 and a fan 55. The fan 55 is arranged in the air supply duct 52. The air inlet of the air conditioner 51 is connected with the return air port 54 through the air supply duct 52. The air outlet of the air conditioner 51 is connected with the air supply port 53. The air supply port 53 and the air outlet are respectively located at opposite ends of the external environment box 11. An air supply grille 56 and a return air grille 57 are also arranged in the external environment box 11. A first temperature sensor 501 is arranged on the side of the air supply grille facing away from the air supply port 53, and a second temperature sensor 502 is arranged on the side of the return air grille 57 facing the return air port 54.

[0049] The first temperature sensor 501 is used to detect the outlet air temperature Ta2 of the air conditioner 51, and the second temperature sensor 502 is used to detect the return air temperature Ta3 of the heat metering box 41. When the air supply system is working, the air conditioned by the air conditioner 51 is sent out from the air outlet of the air conditioner 51 and transported to the heat metering box 41 through the air supply port 53. The air in the heat metering box 41 enters the air supply duct 52 from the return air port 54, and returns to the air conditioner 51 through the air supply duct 52 and the air inlet of the air conditioner 51. In order to circulate the air in the air supply system, the present embodiment is provided with a fan 55 in the air supply duct 52. In order to improve the air supply effect, the fan 55 can be an axial flow fan. The air supply grille 56 and the return air grille 57 provided in the heat metering box 41 in the present embodiment can improve the uniformity of the internal flow field of the heat metering box 41, so as to facilitate the rapid stabilization of the temperature of the heat metering box 41. An air inlet temperature sensor 503 of the air conditioner 51 is also provided at the air inlet of the air conditioner 51 to detect the temperature of the air inlet of the air conditioner 51.

[0050] In this embodiment, the water supply and return system includes a water supply pipeline 61, a water return pipeline 62 and a water pump 63. The water pump 63 pumps water from the water supply pipeline 61 to the air conditioner 51, and after heat exchange at the air conditioner 51, the water flows back to the water pump 63 through the return pipeline 62.

[0051] The water pump 63 is installed on the water supply pipeline 61, and a water supply temperature sensor 601 is also provided on the water supply pipeline 61 to detect the system water supply temperature. The return water pipeline 62 is also provided with a flow meter 603 to measure the flow of the water supply and return system, and a return water temperature sensor 602 is provided to detect the system return water temperature. The return water pipeline 62 is connected to the water inlet of the water tank, and the water supply pipeline 61 is connected to the water outlet of the water tank. In addition, the return water system is also provided with a valve 64 that can directly connect the return water pipeline 62 and the water supply pipeline 61.

[0052] The external environment box 11 is also provided with a first light source radiation intensity sensor 101, a second light source radiation intensity sensor 102 and a first illuminance sensor 103, wherein the first light source radiation intensity sensor 101 is located below the artificial light source 12 and above the nozzle 32, and the second light source radiation intensity sensor 102 and the illuminance sensor are located below the nozzle 32 and below the light-transmitting roof test piece 20.

[0053] The first light source radiation intensity sensor 101 can detect the radiation intensity of the artificial light source 12 without spray, the second light source radiation intensity sensor 102 can detect the radiation intensity of the artificial light source 12 under spray, and the first illuminance sensor 103 can detect the illuminance outside the test piece under spray.

[0054] In this embodiment, the plurality of detection sensors of the heat metering device include a third light source radiation intensity sensor 401 and a second illumination sensor 402. The third light source radiation intensity sensor 401 is used to detect the radiation intensity in the heat metering box 41 below the light-transmitting roof test piece 20. The second illumination sensor 402 is used to detect the illumination in the heat metering box 41 below the light-transmitting roof test piece 20.

[0055] In this embodiment, the spray device further comprises a spray water supply pipe 31, the spray water supply pipe 31 is connected to a water source, and the nozzle 32 is connected to the spray water supply pipe 31. The spray water supply pipe 31 delivers tap water to the nozzle 32, and the nozzle 32 sprays the tap water above the test piece. Example

[0056] This embodiment also provides a method for detecting the light and thermal performance of a spray-type light-transmitting roof. The method uses the spray-type light-transmitting roof light and thermal performance detection device described in Example 1 to perform detection. Figure 3 As shown, the method includes:

[0057] S1: Get preset experimental requirements;

[0058] S2: Determine the artificial light source control parameters according to the preset experimental requirements;

[0059] S3: Controlling the operation of the artificial light source according to the artificial light source control parameters;

[0060] S4: Control the water supply and return system to circulate water to the air supply system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the light-transmitting roof test piece;

[0061] S5: Obtain the average radiation intensity of the outer surface of the light-transmitting roof test piece under spray conditions, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters of the air supply and return system, the water supply and return system, the heat metering box, the test piece frame, and the light-transmitting roof test piece;

[0062] S6: Calculate the light and heat performance of the spray-type light-transmitting roof according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters.

[0063] like Figure 4 As shown, wherein S2: determining the artificial light source control parameters, the supply and return air system control parameters, and the supply and return water system control parameters according to the preset experimental requirements:

[0064] S21: Obtain the preset average radiation intensity of the outer surface of the light-transmitting roof test piece according to the experimental requirements;

[0065] S22: Obtaining the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source;

[0066] The corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source can be obtained through experiments under dry conditions and by fitting the data through experiments, including:

[0067] S221: Control the water supply and return system to circulate water to the air supply system, and control the air supply and return system to circulate air to the heat metering box;

[0068] S222: dividing the outer surface of the light-transmitting roof test piece into a plurality of area regions;

[0069] S223: Control the artificial light source to output according to the set output radiation intensity;

[0070] S224: measuring the output radiation intensity of the artificial light source in each area;

[0071] S225: Calculate the average output radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece corresponding to the output radiation intensity set by the current artificial light source according to the output radiation intensity of the artificial light source in each area;

[0072] S226: Calculate the average output radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece according to the output radiation intensity of the artificial light source in each area;

[0073] S227: after changing the set artificial light source output radiation intensity, repeat steps S224 to S226 until the average output radiation intensity of the artificial light source corresponding to all the set artificial light source output radiation intensities is obtained;

[0074] S228: Using the regression model, the average output radiation intensity of the artificial light source corresponding to the output radiation intensity of each set artificial light source is fitted to obtain the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source. .in S s is the output radiation intensity of the artificial light source, S m,ave is the average radiation intensity of the outer surface of the test piece. The output radiation intensity of the artificial light source can be detected by a first light source radiation intensity sensor disposed below the artificial light source and above the spray device.

[0075] Wherein S222: dividing the outer surface of the light-transmitting roof test piece into a plurality of area regions comprises: H , specimen surface area A s and the number of lamps with artificial light sources N l Determine the number of area regions to be divided N m ,in N m and H Negatively correlated with A s and N l For example, H =1.5~2.5 m, A s =1.5*1.5=2.25 m2, N l =9 device, N m 9 or 16 are preferred.

[0076] like Figure 5 As shown in the experiment, the corresponding relationship obtained is .

[0077] S23: determining a preset output radiation intensity of the corresponding artificial light source according to a preset average radiation intensity of the outer surface of the light-transmitting roof test piece and a corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source.

[0078] For example, according to the experimental requirements, the radiation intensity on the outer surface of the light-transmitting roof test pieceS m,ave 600 W / m 2 When the radiation intensity is substituted into the corresponding relationship, the preset output radiation intensity of the artificial light source is calculated to be 354.6 W / m 2 .

[0079] For example, when conducting a dynamic experiment, the required hourly solar radiation intensity (this value is S m,ave ) Calculate the hourly setting value of artificial light source S s For example, taking the hourly solar radiation intensity of Guangzhou's typical day weather data as an example, the hourly setting value of the artificial light source can be calculated based on the above corresponding relationship. S s The calculation results are as follows Figure 6 shown.

[0080] like Figure 7 As shown, in this embodiment, the S5: obtaining the average radiation intensity of the outer surface of the light-transmitting roof test piece under the spray condition and the average illumination received by the outer surface of the light-transmitting roof test piece, as well as the thermal parameters of the second air supply and return system, the water supply and return system, the heat metering box, the test piece frame and the light-transmitting roof test piece include:

[0081] S51: Obtain the output radiation intensity of the current artificial light source;

[0082] S52: determining the average radiation intensity of the outer surface of the corresponding light-transmitting roof test piece according to the corresponding relationship between the output radiation intensity of the current artificial light source and the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source;

[0083] The method for accurately obtaining the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source has been described in detail in the previous article and will not be repeated here.

[0084] S53: Obtaining a corresponding relationship between an average radiation intensity on an outer surface of the light-transmitting roof test piece and an average illumination received on the outer surface of the light-transmitting roof test piece;

[0085] This step specifically includes:

[0086] S521: Divide the outer surface of the light-transmitting roof test piece into a plurality of area regions;

[0087] S522: Control the artificial light source to output according to the set output radiation intensity;

[0088] S523: measuring the radiation intensity and illumination of each area; specifically, the radiation intensity and illumination of each area can be detected by using a second light source radiation intensity sensor and a first illumination sensor disposed below the nozzle and above the light-transmitting roof test piece;

[0089] S524: Obtain an average radiation intensity of the outer surface of the light-transmitting roof test piece according to the radiation intensity of each area region, and obtain an average illumination received by the outer surface of the corresponding light-transmitting roof test piece according to the illumination of each area region;

[0090] S525: determining the correspondence between the average radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece and the average illumination received by the outer surface of the light-transmitting roof test piece under the spray condition through a regression model according to the average radiation intensity of the artificial light source on the outer surface of the light-transmitting roof test piece and the corresponding average illumination;

[0091] The regression model obtained through the experiment is: . I m,av It is the average illumination received by the outer surface of the light-transmitting roof test piece.

[0092] S54: determining the average illuminance received by the outer surface of the light-transmitting roof test piece according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece;

[0093] Since the test of the light and thermal performance of the spray-type translucent roof needs to be carried out under spray conditions, but the sensor's detection of the radiation intensity of the outer surface of the translucent roof test piece and the illuminance received by the outer surface of the test piece will be affected by the spray, how to accurately obtain the radiation intensity of the outer surface of the translucent roof test piece and the illuminance received by the outer surface of the test piece under spray conditions has long been a problem that has plagued technical personnel in this field.

[0094] In this regard, the present embodiment adopts a method of indirectly detecting the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average radiation intensity of the outer surface of the light-transmitting roof test piece under the spray condition, using the first light source radiation sensor arranged above the spray device to detect the radiation intensity at the current position, and then using the corresponding relationship between the output radiation intensity of the artificial light source at the position and the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source to determine the corresponding average radiation intensity of the outer surface of the light-transmitting roof test piece, and then using the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illumination received by the outer surface of the light-transmitting roof test piece to determine the corresponding average illumination received by the outer surface of the light-transmitting roof test piece. Since the first light source radiation sensor is not affected by the spray device, the radiation intensity above the spray device detected by the first light source radiation sensor and the above-mentioned corresponding relationship can accurately convert the average radiation intensity of the outer surface of the light-transmitting roof test piece that is not affected by the spray and the average illumination received by the outer surface of the light-transmitting roof test piece.

[0095] S54: Detect the air inlet temperature and air outlet temperature of the air conditioner in the air supply and return system, detect the return air temperature of the heat metering box, detect the inner surface temperature and outer surface temperature of the four walls of the heat metering box, detect the air conditioner water inlet temperature and water outlet temperature of the air conditioner water supply and return system, detect the inner surface temperature and outer surface temperature of the test piece frame, detect the inner surface temperature and outer surface temperature of the light-transmitting roof test piece, and detect the average solar radiation intensity and average illumination received by the lower surface of the test piece.

[0096] like Figure 8 As shown, in this embodiment, the S6: calculating the light and thermal performance of the spray-type light-transmitting roof according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illumination received by the outer surface of the light-transmitting roof test piece and the thermal parameters includes:

[0097] S61: According to thermal parameters and formulas Calculate indoor solar heat gain Q t The thermal parameters include: the heat capacity of cooling water C , cooling water density ρ , Air conditioner water inlet temperature T w,i , Air conditioner outlet water temperature T w,e , Cooling water flow G , Air conditioner inlet temperature of supply and return air system T a1 , Air conditioner outlet temperature T a2 , Heat metering box return air temperature T a3 , the inner surface temperature of the four walls of the heat metering box Tbx,i , the outer surface temperature of the four walls of the heat metering box T bx,e , the inner surface temperature of the specimen frame T kx,i , the outer surface temperature of the specimen frame T kx,e Where x∈{1,2,3,4}, the unit area heat flux coefficient of the heat metering box M bx , heat metering box surface area A bx , heat flux per unit area of ​​the specimen frame M kx , Surface area of ​​specimen frame A kx , Inner surface temperature of light-transmitting roof test piece T s,i , External surface temperature T s,e , Heat flux coefficient per unit area of ​​light-transmitting roof test piece M s and the surface area of ​​the light-transmitting roof test piece A s ;

[0098] S62: According to the formula Calculate the solar heat gain coefficient SHGC, where S m,ave is the average radiation intensity on the outer surface of the light-transmitting roof test piece;

[0099] S63: Calculated according to the formula T sol = S r,ave / S m,ave Calculate direct solar radiation transmittance T sol ,in S r,ave is the average solar radiation intensity received by the lower surface of the light-transmitting roof test piece;

[0100] S64: Calculated according to the formula T vis = I r,ave / I m,ave Visible light transmittance T vis ,in I r,ave is the average illuminance received by the lower surface of the light-transmitting roof test piece, I m,av It is the average illumination received by the outer surface of the light-transmitting roof test piece.

[0101] In order to more accurately obtain the light and thermal performance of the light-transmitting roof, the following method can be used to correct the test results. The S6: calculating the light and thermal performance of the spray-type light-transmitting roof according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illumination received by the outer surface of the light-transmitting roof test piece and the thermal parameters includes:

[0102] S65: determining the amount of residual water on the outer surface of the light-transmitting roof test piece according to the spray flow rate and the amount of water discharged from the outer surface of the light-transmitting roof test piece;

[0103] The residual water volume Vf=Vspray-Vdrain, where Vspray is the spray flow rate and Vdrain is the drainage volume.

[0104] S66: determining the thickness of the water film on the outer surface of the light-transmitting roof test piece according to the amount of residual water on the outer surface of the light-transmitting roof test piece;

[0105] The thickness of the water film δfilm = (Vspray-Vdrain-Mevap) / ρw / As, where ρw is the density of water.

[0106] S67: Determine the evaporation amount of water on the outer surface of the light-transmitting roof test piece according to the outer surface temperature of the light-transmitting roof test piece and the ambient air humidity;

[0107] The evaporation capacity mevap is the evaporation rate per unit area (kg / (m²·s));

[0108] mevap=hm[Psat(Tsurf)−Pv,air]. hm is the mass transfer coefficient (kg / (m²·s·Pa)). This value can be calibrated experimentally. Psat(Tsurf) is the saturated water vapor partial pressure of water at the membrane surface temperature Tsurf (Pa). Pv,air is the actual water vapor partial pressure of indoor / outdoor air (Pa). It can be calculated from relative humidity, air pressure and temperature.

[0109] The evaporated mass for a period of time Δt is: Mevap = mevap × As × Δt.

[0110] S68: The indoor heat gain from solar radiation based on the evaporation of water on the outer surface of the light-transmitting roof test piece Q t Correction is made and the indoor heat gain is calculated based on the corrected solar radiation. Q t Update the solar heat gain coefficient SHGC;

[0111] That is, from Q t After subtracting the heat taken away by the evaporation of water on the outer surface, the corrected Q tThen, according to the corrected solar radiation indoor heat gain Q t Update the solar heat gain coefficient SHGC;

[0112] S68: Obtaining an optical correction factor according to the thickness of the water film;

[0113] In this step, the association between the water film thickness and the optical transmittance change is first established. A set of corresponding relationships between "water film thickness" and "optical transmittance change value" can be established in advance or during the experiment based on reference data and experimental calibration;

[0114] This correspondence can be expressed as: when the water film is in a certain thickness range, the transmittance of the light-transmitting material increases or decreases compared to the dry condition (which can be expressed as a ratio or percentage).

[0115] Combined with the correspondence between "water film thickness and optical transmittance change", determine the "transmittance adjustment amount" of the roof under the current working condition; define this adjustment amount as the "optical correction factor". For example, if the transmittance under dry conditions is a certain reference value, and the transmittance change caused by the water film is within a percentage range, then this percentage change or ratio change can be used as the optical correction factor. If the optical correction factor is greater than 1, it means that the water film causes the transmittance to be higher than that under dry conditions; if the optical correction factor is less than 1, it means that the transmittance is reduced. Output and store the optical correction factor as the key reference data for subsequent corrections to the solar radiation transmittance and visible light transmittance.

[0116] S69: Correct the solar radiation direct transmission ratio and visible light transmittance ratio according to the optical correction factor;

[0117] In this step, the original solar radiation direct transmission ratio is multiplied by the optical correction factor to obtain the corrected solar radiation direct transmission ratio, and the original visible light transmittance ratio is multiplied by the optical correction factor to obtain the corrected visible light transmittance ratio. These two correction values ​​can better reflect the optical changes caused by the formation of water film on the roof surface under spray conditions.

[0118] The following describes an example of using the device and method of the present invention to detect the light and heat performance of a light-transmitting roof under different boundary conditions.

[0119] Example 1

[0120] Taking the double-layer hollow glass translucent roof configured as 6mm white glass + 12mm argon + 6 mm white glass as an example, according to JGJ / T151-2008 "Thermal Calculation Code for Building Doors, Windows and Glass Curtain Walls", the theoretical calculated value of its SHGC is 0.70.

[0121] At the same time, the detection device and method provided by the present invention are used to reproduce the boundary conditions of the above calculation procedure, wherein the external environment box is set at a temperature of 30°C and a wind speed of 2m / s, and the solar radiation intensity received by the surface of the glass specimen is ensured to be 500 W / m 2 , the temperature of the heat metering box is set to 25℃. After the device runs stably, the SHGC measured value is calculated according to the formula to be 0.702, and the relative error with the theoretical calculated value is only 0.3%, indicating that the detection device has high accuracy. The curve obtained by SHGC measurement can be found in Fig. 9 shown.

[0122] Example 2

[0123] In order to further fully verify the accuracy of the detection device based on Example 1, the boundary conditions were changed according to GB / T 30592-2014 "Test Method for Solar Heat Gain Coefficient of Translucent Enclosure Structures", where the external environment box was set at 26.5°C and the wind speed was 2 m / s, and the solar radiation intensity received by the glass specimen surface was ensured to be 600 W / m2, and the heat metering box was set at 25°C. After the device ran stably, the actual SHGC value calculated by the method of the present invention was 0.73, and the relative error with the theoretical calculated value was only 4.3%, indicating that the accuracy of the detection device was high.

[0124] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figure. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiment, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention. The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, plug-in, function card, etc. When implemented in software, the elements of the present invention are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted on a transmission medium or communication link via a data signal carried in a carrier. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc. It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0125] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for testing using a spray-type light-transmitting roof light and heat performance testing device, characterized in that: The device comprises: The external environment simulation device comprises an external environment box and an artificial light source, wherein the artificial light source is installed in the external environment box; A light-transmitting roof test piece is installed at the lower side wall of the external environment box, and the light-transmitting roof test piece is located below the artificial light source; A spray device, comprising a nozzle, wherein the nozzle is located below the artificial light source and above the light-transmitting roof test piece; A heat metering device, comprising a heat metering box and a plurality of detection sensors, wherein the heat metering box is located below the light-transmitting roof test piece, and the plurality of detection sensors include a third light source radiation intensity sensor and a second illumination sensor, wherein the third light source radiation intensity sensor and the second illumination sensor are located below the light-transmitting roof test piece; A supply and return air system, used for circulating air flow into the heat metering device, wherein the supply and return air system is connected to the heat metering device; A water supply and return system, used for supplying water to the air supply and return system, wherein the water supply and return system is connected to the air supply and return system; A control system, used to control the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return system and the spray device, wherein the control system is electrically connected to the external environment simulation device, the heat metering device, the air supply and return system, the water supply and return system and the spray device; The external environment box is also provided with a first light source radiation intensity sensor, a second light source radiation intensity sensor and a first illumination sensor, wherein the first light source radiation intensity sensor is located below the artificial light source and above the nozzle, and the first light source radiation intensity sensor obtains the output radiation intensity of the artificial light source in the absence of spray, the second light source radiation intensity sensor and the first illumination sensor are located below the nozzle and above the light-transmitting roof test piece, the second light source radiation intensity sensor obtains the output radiation intensity of the artificial light source in the spray condition, and the first illumination sensor detects the illumination outside the test piece in the spray condition; The method comprises: Get preset experimental requirements; Determine the artificial light source control parameters according to the preset experimental requirements, obtain the preset average radiation intensity of the outer surface of the light-transmitting roof test piece according to the experimental requirements, obtain the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece under dry conditions and the output radiation intensity of the artificial light source, and determine the corresponding preset output radiation intensity of the artificial light source according to the preset average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source; Controlling the operation of the artificial light source according to the artificial light source control parameters; Control the water supply and return system to circulate water to the air supply and return system, control the air supply and return system to circulate air to the heat metering box, and control the spray device to spray above the light-transmitting roof test piece; Obtain the average radiation intensity on the outer surface of the light-transmitting roof test piece under spray conditions, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters of the air supply and return system, water supply and return system, heat metering box, test piece frame and light-transmitting roof test piece; The light and heat performance of the spray-type light-transmitting roof is calculated according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters.

2. The method according to claim 1, characterized in that The air supply and return system includes an air conditioner, an air supply duct, an air supply outlet, a return air outlet and a fan, the fan is arranged in the air supply duct, the air supply outlet and the return air outlet are respectively located at opposite ends of the external environment box, the air inlet of the air conditioner is connected with the return air outlet through the air supply duct, and the air outlet of the air conditioner is connected with the air supply outlet, and the heat metering box is also provided with an air supply grille and a return air grille, a first temperature sensor is arranged on the side of the air supply grille facing away from the air supply outlet, and a second temperature sensor is arranged on the side of the return air grille facing the return air outlet.

3. The method according to claim 2, characterized in that It also includes a water supply and return system, which includes a water supply pipeline, a water return pipeline and a water pump. The water pump pumps water from the water supply pipeline to the air conditioner, and the water flows back to the water pump through the return pipeline after heat exchange at the air conditioner.

4. The method according to claim 1, characterized in that The spray device also includes a spray water supply pipe, the spray water supply pipe is connected to a water source, and the nozzle is connected to the spray water supply pipe.

5. The method according to claim 1, characterized in that The method of obtaining the average radiation intensity of the outer surface of the light-transmitting roof test piece under the spray condition, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters of the air supply and return system, the water supply and return system, the heat metering box, the test piece frame, and the light-transmitting roof test piece includes: Get the output radiation intensity of the current artificial light source; Determine the average radiation intensity of the outer surface of the corresponding light-transmitting roof test piece according to the corresponding relationship between the output radiation intensity of the current artificial light source and the average radiation intensity of the outer surface of the light-transmitting roof test piece and the output radiation intensity of the artificial light source; Obtaining the corresponding relationship between the average radiation intensity on the outer surface of the light-transmitting roof test piece and the average illumination received on the outer surface of the light-transmitting roof test piece; Determine the average illuminance received by the outer surface of the light-transmitting roof test piece according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the corresponding relationship between the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illuminance received by the outer surface of the light-transmitting roof test piece; Detect the air inlet temperature and outlet temperature of the air conditioner in the air supply and return system, detect the return air temperature of the heat metering box, detect the inner and outer surface temperatures of the four walls of the heat metering box, detect the air conditioner inlet and outlet water temperatures of the air conditioner supply and return water system, detect the inner and outer surface temperatures of the test piece frame, detect the inner and outer surface temperatures of the light-transmitting roof test piece, and detect the average solar radiation intensity and average illumination received by the lower surface of the test piece.

6. The method according to claim 5, characterized in that The method of calculating the light and heat performance of the spray-type light-transmitting roof according to the average radiation intensity of the outer surface of the light-transmitting roof test piece, the average illumination received by the outer surface of the light-transmitting roof test piece, and the thermal parameters includes: According to thermal parameters and formulas Calculate indoor solar heat gain Q t The thermal parameters include: the heat capacity of cooling water C , cooling water density ρ , Air conditioner water inlet temperature T w,i , Air conditioner outlet water temperature T w,e , Cooling water flow G , Air conditioner inlet temperature T a1 , Air conditioner outlet temperature T a2 , Heat metering box return air temperature T a3 , the inner surface temperature of the four walls of the heat metering box T bx,i The outer surface temperature of the four walls of the heat metering box T bx,e , the inner surface temperature of the specimen frame T kx,i , the outer surface temperature of the specimen frame T kx,e Where x∈{1,2,3,4}, the heat flux coefficient per unit area of ​​the heat metering box M bx , heat metering box surface area A bx , heat flux per unit area of ​​the specimen frame M kx , Surface area of ​​specimen frame A kx , Inner surface temperature of light-transmitting roof test piece T s,i , External surface temperature T s,e , Heat flux coefficient per unit area of ​​light-transmitting roof test piece M s and the surface area of ​​the light-transmitting roof test piece A s ; According to the formula Calculate the solar heat gain coefficient SHGC, where S m,ave is the average radiation intensity on the outer surface of the light-transmitting roof test piece; Calculated according to the formula T sol = S r,ave / S m,ave Calculate the direct transmission ratio of solar radiation T sol ,in S r,ave is the average solar radiation intensity received by the lower surface of the light-transmitting roof test piece; Calculated according to the formula T vis = I r,ave / I m,ave Visible light transmittance T vis ,in I r,ave is the average illuminance received by the lower surface of the light-transmitting roof test piece, I m,av It is the average illumination received by the outer surface of the light-transmitting roof test piece.

7. The method according to claim 6, characterized in that The calculation of the light-thermal performance of the spray-type light-transmitting roof according to the average radiation intensity of the outer surface of the light-transmitting roof test piece and the average illumination received by the outer surface of the light-transmitting roof test piece and the thermal parameters also includes: Determine the amount of residual water on the outer surface of the light-transmitting roof test piece according to the spray flow rate and the water discharge on the outer surface of the light-transmitting roof test piece; Determining the thickness of the water film on the outer surface of the light-transmitting roof test piece according to the amount of residual water on the outer surface of the light-transmitting roof test piece; Determining the evaporation amount of water on the outer surface of the light-transmitting roof test piece according to the outer surface temperature of the light-transmitting roof test piece and the ambient air humidity; The indoor solar radiation heat gain is calculated based on the evaporation of water on the outer surface of the light-transmitting roof test piece Q t Correction is made and the corrected indoor solar radiation heat gain is calculated based on the Q t Update the solar heat gain coefficient SHGC; Obtaining an optical correction factor according to the thickness of the water film; The solar radiation direct transmittance and visible light transmittance are corrected according to the optical correction factor.

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