Building external window solar heat gain coefficient detection device and control method thereof

Abstract

The invention provides a building external window solar heat gain coefficient detection device and a control method thereof. According to the device, a detection chamber is divided into an outdoor environment simulation chamber and a heat metering box environment chamber through a partition wall. And a test piece frame for arranging a tested piece is arranged on the partition wall body. A heat metering box, a cooling circulation system and a data acquisition device are arranged in the heat metering box environment chamber. The heat metering box is provided with an opening located at the test piece frame so as to receive simulation radiation of the outdoor environment simulation chamber penetrating through the tested piece. The detection work of the solar heat gain coefficient of the external window of the building is not influenced by natural conditions such as weather, and the test efficiency is improved. Furthermore, a channel flat pipe and a constant-temperature water bath device in the cooling circulation system are matched with each other, it is guaranteed that the temperature in the environment chamber of the heat metering box is kept stable, and the stability and accuracy of detection data are improved while the structure of the device is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of building doors and windows, and in particular to a solar heat gain coefficient detection device for building exterior windows and a control method thereof. Background Art

[0002] In hot summer regions, solar heat gain from building exterior windows is the main factor contributing to high air conditioning energy consumption and a poor indoor thermal environment. Solar heat gain entering the room through exterior windows generally accounts for around 80% of the building's total solar heat gain. High radiation conditions can easily cause the indoor air temperature to be too high during the day and too low at night, affecting the indoor thermal comfort level. Using appropriate shading measures on exterior windows can effectively block the intrusion of solar radiation, reduce solar heat gain, and thus reduce air conditioning and cooling energy consumption. Existing technologies use the solar heat gain coefficient as an indicator for evaluating the solar heat gain performance of windows. The solar heat gain coefficient reflects the amount of solar heat gain entering the room through a specific transparent enclosure structure, and can directly reflect the thermal performance of the translucent enclosure structure. However, traditional exterior window solar heat gain coefficient detection devices still have several limitations.

[0003] On the one hand, due to the limitations of outdated technology and equipment structure, heat dissipation is slow and the ability to process heat per unit time is insufficient, resulting in a lengthy and time-consuming testing process, seriously affecting testing efficiency. Furthermore, the system itself cannot effectively maintain a stable testing environment, requiring the use of a mechanical ventilation system to precisely control the temperature of the outdoor environment simulation chamber. This not only complicates the testing system structure and significantly increases the difficulty of connecting various components, debugging, and maintenance, but also places extremely high demands on site space, installation precision, and operator expertise during the equipment installation process, making installation errors a possibility even with the slightest carelessness.

[0004] Furthermore, the temperature of the heat metering chamber can fluctuate due to factors such as external climate fluctuations, heat interference from equipment operation, and uneven internal heat exchange. Traditional external window SHC measurements cannot guarantee a constant temperature in the chamber, resulting in inaccurate SHC measurements. Summary of the Invention

[0005] An object of the present invention is to overcome at least one defect in the prior art and to provide a device for detecting the solar heat gain coefficient of a building exterior window.

[0006] A further object of the present invention is to improve the heat processing capability of the solar heat gain coefficient detection device and enhance detection efficiency by providing a cooling circulation system.

[0007] Another further object of the present invention is to provide a constant temperature water bath device and a channel flat tube to work together, so as to not only adjust the temperature of the heat metering box environmental chamber, but also ensure that the heat metering box environmental chamber is in a constant temperature state, thereby improving the measurement accuracy.

[0008] In particular, the present invention provides a device for detecting the solar heat gain coefficient of a building exterior window, comprising: a detection chamber, the interior of which is divided into an outdoor environment simulation chamber and a heat metering box environment chamber by a partition wall, and a specimen frame for arranging a test piece is provided on the partition wall; a heat metering box, arranged in the heat metering box environment chamber, and provided with an opening at the specimen frame to receive simulated radiation from the outdoor environment simulation chamber through the test piece; a cooling circulation system, comprising a channel flat tube, which is installed on the inner wall of the heat metering box opposite to the specimen frame, and is used to absorb at least part of the heat generated by the simulated radiation by using the cold fluid flowing therethrough.

[0009] Optionally, the solar heat gain coefficient detection device for building exterior windows also includes: a constant temperature water bath device, which is connected to the channel flat tube and is configured so that a cold fluid flows into the channel flat tube to absorb heat and then a hot fluid flows out; a water pump, which is arranged in a pipeline connecting the constant temperature water bath device and the channel flat tube, and is used to provide power for the fluid to flow in the constant temperature water bath device and the channel flat tube; a flow sensor, which is used to monitor the flow of the cooling circulation system.

[0010] Optionally, the channel flat tube includes: a lower manifold, through which the cold fluid flows into the channel flat tube; an upper manifold, through which the hot fluid flows out of the channel flat tube; and multiple flat tubes installed in parallel between the lower manifold and the upper manifold to absorb heat in the heat metering box.

[0011] Optionally, the solar heat gain coefficient detection device for building exterior windows also includes: a data acquisition device, which is arranged in the heat metering box environmental room, and is used to collect and record data from each measuring point in real time; wherein, the data acquisition device includes: temperature sensors, which are arranged on the inner side and outer surface of the test piece, the inner and outer surfaces of the heat metering box, the interior of the heat metering box environmental chamber and the outdoor environmental simulation chamber, and the fluid inlet and fluid outlet of the constant temperature water bath device; radiation sensors, which are arranged on the inner and outer surfaces of the test piece, and are used to monitor the solar radiation intensity of the inner and outer surfaces of the test piece; and the data from each measuring point include: the internal temperature of the heat metering box, the temperature on both sides of the box wall of the heat metering box, the internal temperature of the outdoor environmental simulation chamber, the temperature on both sides of the test piece, the flow rate in the cooling circulation system, and the fluid temperature at the fluid inlet and fluid outlet.

[0012] Optionally, the solar heat gain coefficient detection device for building exterior windows also includes: a movable mounting plate, which is arranged on the partition wall, and the test piece frame is opened on the movable mounting plate; and a sealing pad, which is arranged around the movable mounting plate to ensure the airtightness of the heat metering box.

[0013] Optionally, the heat metering box includes: an absorption plate, arranged on the channel flat tube, for absorbing solar radiation that passes through the tested piece and enters the heat metering box; and an insulation layer, arranged on the inner wall of the heat metering box, for absorbing solar radiation that passes through the tested piece and enters the heat metering box.

[0014] Optionally, the solar heat gain coefficient detection device for building exterior windows also includes: a solar radiation simulator, which is arranged in an outdoor environment simulation room and is used to simulate outdoor environment solar radiation. The irradiation intensity of the solar radiation simulator ranges from 500 to 1000W / m2; wherein, the solar radiation simulator includes: multiple halogen lamps, reflectors and filters.

[0015] Optionally, the solar heat gain coefficient detection device for building exterior windows also includes: an outdoor environment simulation room air conditioner for maintaining the ambient temperature of the outdoor environment simulation room stable; and a heat metering box environment room air conditioner for maintaining the ambient temperature of the heat metering box environment room stable.

[0016] Optionally, according to another aspect of the present invention, a control method for a solar heat gain coefficient detection device for building exterior windows is also provided, which is used to control any of the above-mentioned solar heat gain coefficient detection devices for building exterior windows, and the method includes: regulating the temperature of the heat metering box environmental chamber and the outdoor environmental simulation chamber according to preset standards; adjusting the water bath device in the cooling circulation system to a preset temperature, and starting the cooling circulation system; continuously collecting the average temperature inside the heat metering box, the temperature on both sides of the box wall of the heat metering box, the average temperature inside the outdoor environmental simulation chamber, the temperature on both sides of the specimen frame, the flow rate in the cooling circulation system, and the supply and return water temperature; turning on the solar radiation simulator, completing data collection at preset intervals, and obtaining the solar heat gain coefficient based on the calibrated calculation formula.

[0017] Optionally, the calibration test calculation formula is

[0018] SHGC′·′·A=G′C′ρ′·(t c ′-t j ′)+(t jln ′-t jlw ′)·M1+(t kn ′-t kw ′)·M2+(t gn ′-t gw ′)·M3

[0019] SHGC″·″·A=G″C″ρ″·(t c ″-t j ″+(t jln ″-t jlw ″)·M1+(t kn ″-t kw ″)·M2+(t gn ″-tgw ″)·M3

[0020] SHGC″′·I″′·A=G″′C″′ρ″′·(t c ″′-t j ″′)+(t jln ″′-t jlw ″′)·M1+(t kn ″′-t kw ″′)·M2+(t gn ″′-t gw ″′)·M3, where SHGC represents the solar heat gain coefficient of the test piece in the three calibration experiments, I represents the radiant heat of the artificial simulated outdoor environment solar radiation incident on the surface of the test piece in the three calibration experiments, A represents the effective area of ​​the test piece in the calibration test, G represents the water flow rate in the cooling circulation system, C represents the specific heat of water in the cooling circulation system, ρ represents the water density in the cooling circulation system, M1, M2, and M3 represent the heat flow coefficients of the heat meter box, the test piece frame, and the glass, and t c , t j Indicates the fluid outlet temperature and fluid inlet temperature, t jl , t jlw Indicates the inner surface temperature of the outer wall of the heat metering box and the outer surface temperature of the outer wall of the heat metering box, t kn , t kw Indicates the surface temperature inside and outside the specimen frame, t gn , t gw Indicates the inner and outer surface temperatures of the test piece. The calculation formula for the solar heat gain coefficient is:

[0021] Q gain =GCρ·(t c -t j )+(t jln -t jhr )·M1+(t kn -t kw )·M2+(t gn -t gw )·M3

[0022] Among them, Q gain is the heat gain coefficient of the test piece.

[0023] The cooling circulation system of the solar heat gain coefficient detection device for building exterior windows provided by the present invention includes flat channel tubes that can quickly adjust the temperature inside the heat metering box. The device can perform all-weather testing, ensuring that the solar heat gain coefficient of building exterior windows is not affected by weather and other natural conditions, thereby improving testing efficiency.

[0024] Furthermore, the constant-temperature water bath within the cooling circulation system works in conjunction with the channel flat tubes to rapidly adjust the temperature within the heat metering box while maintaining a constant temperature. The present invention streamlines the solar heat gain coefficient detection device for building exterior windows while also improving the stability and accuracy of detection data.

[0025] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0027] Figure 1 2 is a schematic structural diagram of a solar heat gain coefficient detection device according to an embodiment of the present invention;

[0028] Figure 2 is a structural schematic diagram of a heat metering box according to an embodiment of the present invention;

[0029] Figure 3 2 is a schematic structural diagram of a channel flat tube according to an embodiment of the present invention;

[0030] Figure 4 1 is a schematic diagram of a control flow of a solar heat gain coefficient detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention provides a device for detecting the solar heat gain coefficient of a building exterior window. Figure 1 and Figure 2 As shown, the heat gain coefficient detection device may include a detection chamber 10, the interior of which is divided by a partition wall 11 into an outdoor environment simulation chamber 200 and a heat metering box environment chamber 100. The partition wall 11 is also provided with a specimen frame 12 for arranging the test pieces. The heat gain coefficient detection device may also include a heat metering box 110 and a cooling circulation system 120. The outdoor environment simulation chamber 200 can independently simulate external climate conditions (such as solar radiation), while the heat metering box environment chamber 100 focuses on controlling the internal constant temperature environment. The two are isolated by the partition wall 11 to avoid mutual interference and ensure the accuracy of the detection conditions.

[0032] Heat meter box 110 can be installed within heat meter box environmental chamber 100. An opening is provided at specimen frame 12 for receiving simulated radiation from the outdoor environment simulation chamber 200 through the test piece. The opening is aligned directly with specimen frame 12, ensuring that simulated radiation passing through the exterior window enters heat meter box 110 unobstructed. This prevents heat loss or scattering during transfer, allowing heat meter box 110 to accurately collect all heat energy from the exterior window, improving the accuracy of test data.

[0033] The distance between the center point of the heat metering box 110 and the ground can be set to 1m to 1.4m, preferably 1.2m. This setting is more in line with the actual use environment of the user's building exterior windows.

[0034] The cooling circulation system 120 may include flat channel tubes 130 mounted on the inner wall of the heat metering box 110 opposite the specimen frame 12. These flat channel tubes 130 utilize the cooling fluid flowing through them to absorb at least a portion of the heat generated by the simulated radiation. Flat channel tubes 130 are positioned directly against the inner wall of the heat metering box 110. When simulated radiant heat enters the box, the cooling fluid flowing through the flat channel tubes 130 rapidly absorbs the heat, preventing temperature increases or fluctuations within the box.

[0035] The channel flat tubes 130 can be extruded from an aluminum alloy, with multiple flat tubes 133 installed in parallel. Mixing sections can be installed at the inlet and outlet of the flat tubes 133, with a height difference designed to allow cold fluid to enter from the lower side and hot fluid to exit from the higher side. The inner side of the channel flat tubes 130 can be bonded to the insulation board of the heat metering box 110, and the outer side can be welded to the absorption board 111. These are connected to a constant temperature water bath 140 to form a cooling circulation system 120, allowing the fluid entering the heat metering box 110 to be rapidly cooled and metered.

[0036] The cooling circulation system 120 may include a constant-temperature water bath 140, a water pump 121, and a flow sensor 122. The constant-temperature water bath 140 is connected to the channel tubes 130, configured so that a cold fluid flows into the channel tubes 130, absorbs heat, and then flows out as a hot fluid. The constant-temperature water bath 140 stabilizes the temperature of the cold fluid at a set value, ensuring that the fluid flowing into the channel tubes 130 always has a constant heat absorption capacity. For example, when the hot fluid returns to the water bath, the system quickly cools it to a preset temperature, preventing cooling efficiency losses caused by fluid temperature fluctuations and thus ensuring temperature stability within the thermal metering box environmental chamber 100.

[0037] Water pump 121 is installed in the pipeline connecting constant temperature water bath 140 and channel flat tube 130, and is used to provide power for the fluid to flow in constant temperature water bath 140 and channel flat tube 130. By continuously operating, water pump 121 pushes the cold fluid through channel flat tube 130 and then pumps the hot fluid back into constant temperature water bath 140, maintaining a stable flow rate and flow velocity.

[0038] The flow sensor 122 is used to monitor the flow of the cooling circulation system 120. The flow sensor 122 can provide real-time feedback of fluid flow data, and can determine whether the cooling system is operating normally based on flow changes or provide data basis for calculating the solar heat gain coefficient.

[0039] The channel flat tube 130 may include a lower manifold 131, an upper manifold 132, and a plurality of flat tubes. Figure 3 As shown, multiple flat tubes 133 are installed in parallel between lower manifold 131 and upper manifold 132. Cold fluid from constant temperature water bath 140 flows through lower manifold 131 into multiple flat tubes 133, absorbing heat from heat metering box 110. The resulting hot fluid then flows out through upper manifold 132 and back into constant temperature water bath 140. The parallel connection of multiple flat tubes 133 significantly increases the contact area between the cold fluid and the inner wall of heat metering box 110, improving the efficiency of temperature regulation within heat metering box 110.

[0040] The solar heat gain coefficient detection device may also include a data acquisition device 150, which is located within the heat metering chamber 100 and is used to collect and record data from each measurement point in real time. The data acquisition device 150 may include a temperature sensor 151 and a radiation sensor 152. The temperature sensors 151 are located on the inner and outer surfaces of the test piece, the inner and outer surfaces of the heat metering chamber 110, the interior of the heat metering chamber 100 and the outdoor environment simulation chamber 200, and the fluid inlet and outlet of the constant temperature water bath 140. By detecting the temperature at each location, the temperature sensors 151 can provide a data basis for calculating the heat gain coefficient.

[0041] The radiation sensors 152 may be disposed on the inner and outer surfaces of the test piece to monitor the solar radiation intensity on the inner and outer surfaces of the test piece.

[0042] The data at each measuring point may include the internal temperature of the heat metering box 110, the temperature on both sides of the box wall of the heat metering box 110, the internal temperature of the outdoor environment simulation chamber 200, the temperature on both sides of the test piece, the flow rate in the cooling circulation system 120, and the fluid temperature at the fluid inlet and fluid outlet.

[0043] The data measured by the temperature sensor 151 and the radiation sensor 152 can be transmitted to a computer for calculation of the heat gain coefficient. Those skilled in the art can select an appropriate data transmission method based on actual conditions. For example, the data can be transmitted to the computer via protocols such as RS485 and RS232.

[0044] The heat gain coefficient detection device also includes a movable mounting plate 13 and a sealing gasket 14. The movable mounting plate 13 is arranged on the partition wall 11, and the test piece frame 12 is opened on the movable mounting plate 13. The sealing gasket 14 is arranged around the movable mounting plate 13 to ensure the airtightness inside the heat metering box 110. The movable mounting plate 13 can be flexibly disassembled or adjusted to facilitate the installation, positioning and subsequent replacement of the test piece, thereby improving the operational convenience of the detection device. The sealing gasket is arranged around the movable mounting plate 13, which can effectively fill the gap between the mounting plate and the partition wall 11, prevent the air in the heat metering box 110 from convecting or leaking with the outside world, and avoid interference of ambient temperature fluctuations on the detection results.

[0045] The movable mounting plate 13 can be detachably mounted on the partition wall 11. The movable mounting plate 13 can be fixed to the opening of the partition wall 11 by means of locking bolts. An annular sealing groove can be provided around the mounting plate and a heat-insulating sealing rubber pad 14 can be embedded therein, and an airtight connection of the test piece can be achieved by a rotating clamping mechanism. The opening of the heat metering box 110 can also be connected to the movable mounting plate 13 by means of locking bolts. Through the coordinated design of detachable mounting, bolt fixing, sealing structure and clamping mechanism, the convenience of test piece installation, the reliability of system sealing and the stability of the heat exchange process are achieved, which not only improves the detection efficiency but also ensures the accuracy of the solar heat gain coefficient calculation.

[0046] Those skilled in the art can select an appropriate shape and size of the movable mounting plate 13, such as a rectangular movable mounting plate 13 or a circular movable mounting plate 13. For another example, a movable mounting plate 13 with dimensions of 600 mm x 600 mm can be used depending on the specific testing situation. The above is merely an example, and those skilled in the art can select a movable mounting plate 13 of different shapes and sizes based on actual use.

[0047] The size of the heat metering box 110 can be determined according to the size of the movable mounting plate 13. Taking the size of the movable mounting plate 13 as 600mm×600mm as an example, the size of the heat metering box 110 can be set to 400mm(D)×600mm(W)×600mm(H). Such a setting can ensure that the heat metering box 110 can fit tightly with the movable mounting plate 13.

[0048] The heat metering box 110 may include an absorption plate 111 and a heat-insulating layer 112. Figure 2As shown, an absorption plate 111 is mounted on the flat channel tubes 130 to absorb solar radiation that passes through the test object and enters the heat metering box 110. An insulation layer 112 is mounted on the inner wall of the heat metering box 110 to absorb solar radiation that passes through the test object and enters the heat metering box 110. The absorption plate 111 is in close contact with the flat channel tubes 130, rapidly transferring the absorbed heat to the cold fluid flowing through it. This heat is then removed through fluid circulation, preventing heat accumulation within the heat metering box 110 and ensuring the real-time and accurate heat gain coefficient testing process.

[0049] The insulation layer 112 wraps around the inner wall of the heat metering box 110, effectively preventing the heat inside the box from being lost to the external environment and avoiding energy loss due to heat conduction. The heat change inside the heat metering box 110 is determined only by the solar heat gain of the test piece and the heat dissipation of the cooling circulation system 120, ensuring the accuracy of the test data.

[0050] The absorption plate 111 can be made of blackened aluminum oxide, with a surface solar radiation absorption coefficient of at least 0.95. The thickness of the absorption plate 111 can be set to 0.2 mm to 0.4 mm, preferably 0.3 mm. The insulation layer 112 can be made of a polystyrene board with excellent thermal insulation properties. The thickness of the insulation layer 112 can be set to 30 mm to 50 mm, preferably 40 mm.

[0051] The solar heat gain coefficient detection device may also include a solar radiation simulator 210, which is arranged in the outdoor environment simulation chamber 200 to simulate the solar radiation of the outdoor environment. The irradiation intensity of the solar radiation simulator 210 ranges from 500 to 1000W / ㎡. Among them, the solar radiation simulator 210 includes: multiple halogen lamps, reflectors and filters. The solar radiation simulator generates an irradiation intensity of 500 to 1000W / ㎡ in the outdoor environment simulation chamber 200, covering the solar radiation range of a typical sunny day, and can reproduce real outdoor lighting conditions in a laboratory environment, ensuring that the solar heat gain performance test of the tested piece is equivalent and reliable.

[0052] Halogen lamps emit continuous radiation close to the solar spectrum, with high luminous efficiency and stable color temperature. This ensures that the simulator's irradiance intensity and spectral distribution are close to those of actual solar radiation, reducing detection errors caused by differences in light sources. A reflector reflects and focuses the scattered light emitted by the halogen lamp onto the surface of the test piece, reducing light energy loss while evenly distributing the irradiance intensity to avoid localized over- or under-irradiation. This ensures uniform radiation received by the test piece surface and improves the accuracy of test data. A filter filters the halogen lamp's spectrum, removing wavelengths that differ significantly from the solar spectrum, bringing the simulator's spectral distribution closer to that of actual solar radiation and avoiding errors in the test piece's radiation absorption due to spectral deviations. The light emitted by the solar radiation simulator 210 illuminates the test piece at a fixed angle of incidence. After turning on the solar radiation simulator 210, both the outdoor environmental simulation room air conditioner 220 and the heat metering box environmental room air conditioner 160 must be turned on simultaneously to maintain a constant air temperature in the test chamber 10. This configuration is more conducive to the accuracy of the measured heat gain coefficient.

[0053] The solar radiation simulator 210 may also be provided with a lampshade. The shape of the lampshade may be adapted to the light source. For example, a square lampshade may be used to allow the artificial light source to illuminate the surface of the test piece in a regular square pattern, achieving uniform illumination.

[0054] Furthermore, the solar radiation simulator 210 should meet the spectral distribution requirements of AM1.5 specified in the national standard GB / T17683.1, and before testing, the solar radiation simulator 210 should be calibrated for radiation quantity and uniformity with reference to the standard GB / T30592-2014 to ensure that the uniformity of the light source radiation illumination is greater than 99.6% to meet the detection accuracy requirements.

[0055] The solar heat gain coefficient testing device may also include an outdoor environment simulation chamber air conditioner 220 and a heat metering chamber air conditioner 160. These air conditioners are used to maintain stable temperatures in the outdoor environment simulation chamber 200 and the heat metering chamber 100, respectively. The air conditioning systems precisely control the temperatures of both chambers, preventing fluctuations in the test piece's heat conduction, convection, and other parameters due to ambient temperature fluctuations. This ensures that when calculating the solar heat gain coefficient, heat fluctuations are solely determined by solar radiation and the test piece's performance, rather than by ambient temperature interference.

[0056] This embodiment also provides a control method for a building exterior window solar heat gain coefficient detection device, which is used to control the building exterior window solar heat gain coefficient detection device of any of the above embodiments, such as Figure 4 As shown, the control method at least includes steps S101 to S104.

[0057] Step S101 : regulating the temperatures of the heat metering box environment chamber and the outdoor environment simulation chamber according to a preset standard.

[0058] Step S102: Adjust the water bath within the cooling circulation system to a preset temperature and start the cooling circulation system. The preset temperature preferably ranges from 25°C to 35°C, with a fluctuation of ≤0.5°C. After starting the cooling circulation system, the constant temperature water bath can be set to 10°C to 15°C (with a fluctuation of ≤0.5°C). Once the ambient temperatures reach a steady state, proceed to the next step.

[0059] Step S103 , continuously collect the average temperature inside the heat metering box, the temperature on both sides of the heat metering box wall, the average temperature inside the outdoor environment simulation room, the temperature on both sides of the specimen frame, the flow rate in the cooling circulation system, and the supply and return water temperatures.

[0060] Step S104 , starting the solar radiation simulator, completing data collection at a preset interval, and obtaining the solar heat gain coefficient according to the calibrated calculation formula.

[0061] The calibration test calculation formula is:

[0062] SHGC′·I′·A=G′C′ρ′·(t c ′-t j ′)+(t jln ′-t jlw ′)·M1+(t kn ′-t kw ′)·M2+(t gn ′-t gw ′)·M3

[0063] SHGC"I"·A=G"C"ρ"·(t c ″-t j ″)+(t jln ″-t jlw ″)·M1+(t kn ″-t kw ″)·M2+(t gn ″-t gw ″)·M3

[0064] SHGC″′·I″′·A=G″′C″′ρ″′·(t c ″′-t j ″′)+(t jln ″′-t jlw ″′)·M1+(t kn ″′-t kw ″′)·M2+(t gn ″′-t gw ″′)·M3

[0065] Where SHGC represents the solar heat gain coefficient of the test piece in the three calibration experiments, I represents the radiant heat of the artificial simulated outdoor environment solar radiation incident on the surface of the test piece in the three calibration experiments, A represents the effective area of ​​the test piece in the calibration test, G represents the water flow rate in the cooling circulation system, C represents the specific heat of water in the cooling circulation system, ρ represents the water density in the cooling circulation system, M1, M2, and M3 represent the heat flow coefficients of the heat meter box, the test piece frame, and the glass, and t c , t j Indicates the fluid outlet temperature and fluid inlet temperature, t jl , t jlw Indicates the inner surface temperature of the outer wall of the heat metering box and the outer surface temperature of the outer wall of the heat metering box, t kn , t kw Indicates the surface temperature inside and outside the specimen frame, t gn , t gw Indicates the inner surface temperature and outer surface temperature of the tested piece;

[0066] The calculation formula for the solar heat gain coefficient is:

[0067] Q gain =GCρ·(t c -t j )+(t jln -t jlw )·M1+(t kn -k kw )·M2+(t gn -t gw )·M3

[0068]

[0069] Among them, Q gain The above three calibration experiments are only an example, and those skilled in the art can freely select the number of calibration experiments according to the accuracy requirements of the actual test.

[0070] After calculating the heat gain coefficient, you can also perform simulations and verification using thermal performance analysis software. This software can be used to calculate the solar heat gain coefficient (SHGC) for five different window types and compare it with the average of two measurements. For example, Windows 7.4 software can be used for simulation verification. If the relative error between the measured and calculated data is within 7%, the test results are highly consistent with the software calculations, indicating that the testing process is sound and the testing platform is reliable and accurate.

[0071] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

[0072] Unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0073] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of the present disclosure have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0074] In the description of this disclosure, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, rather than all embodiments of the present invention, and that these embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

Claims

1. A device for detecting solar heat gain coefficient of building exterior windows, characterized in that include: The testing room is divided into an outdoor environment simulation room and a heat metering box environment room by a partition wall, and the partition wall is provided with a test piece frame for arranging the test piece; a heat metering box, disposed in the heat metering box environmental chamber, and provided with an opening located at the test piece frame to receive simulated radiation from the outdoor environmental simulation chamber through the test piece; The cooling circulation system includes a channel flat tube, which is installed on the inner wall of the heat metering box opposite to the test piece frame and is used to absorb at least part of the heat generated by the simulated radiation by using the cold fluid flowing through.

2. The solar heat gain coefficient detection device for building exterior windows according to claim 1, characterized in that: The cooling circulation system further comprises: a constant temperature water bath device, connected to the channel flat tubes and configured so that the cold fluid flows into the channel flat tubes to absorb heat and then flows out as hot fluid; a water pump, disposed in a pipeline connecting the constant temperature water bath device and the channel flat tube, for providing power for the fluid to flow in the constant temperature water bath device and the channel flat tube; The flow sensor is used to monitor the flow of the cooling circulation system.

3. The solar heat gain coefficient detection device for building exterior windows according to claim 2, characterized in that: The channel flat tube includes: A lower manifold, through which the cold fluid flows into the channel flat tubes; an upper manifold, through which the hot fluid flows out of the channel flat tubes; A plurality of flat tubes are installed in parallel between the lower manifold and the upper manifold to absorb heat in the heat metering box.

4. The device for detecting solar heat gain coefficient of building exterior windows according to claim 2, wherein: Also includes: A data acquisition device is provided in the environmental chamber of the heat metering box and is used to collect and record data from each measuring point in real time; wherein the data acquisition device includes: Temperature sensors are provided on the inner and outer surfaces of the test piece, the inner and outer surfaces of the heat metering box, the interior of the heat metering box environmental chamber and the outdoor environment simulation chamber, and the fluid inlet and fluid outlet of the constant temperature water bath device; Radiation sensors are provided on the inner and outer surfaces of the test object, and are used to monitor the solar radiation intensity on the inner and outer surfaces of the test object; and The data at each measuring point include: the internal temperature of the heat metering box, the temperature on both sides of the box wall of the heat metering box, the internal temperature of the outdoor environment simulation room, the temperature on both sides of the tested piece, the flow rate in the cooling circulation system, and the fluid temperature at the fluid inlet and the fluid outlet.

5. The device for detecting solar heat gain coefficient of building exterior windows according to claim 1, characterized in that: Also includes: A movable mounting plate is provided on the partition wall, and the specimen frame is provided on the movable mounting plate; Sealing rubber pads are arranged around the movable mounting plate to ensure the airtightness of the heat metering box.

6. The device for detecting solar heat gain coefficient of building exterior windows according to claim 1, characterized in that: The heat metering box comprises: an absorption plate, provided on the channel flat tube, for absorbing solar radiation that passes through the tested object and enters the heat metering box; The heat-insulating layer is provided on the inner wall of the heat metering box and is used for absorbing the solar radiation that passes through the tested piece and enters the heat metering box.

7. The device for detecting solar heat gain coefficient of building exterior windows according to claim 1, characterized in that: Also includes: A solar radiation simulator is provided in the outdoor environment simulation room and is used to simulate outdoor solar radiation. The irradiation intensity of the solar radiation simulator ranges from 500 to 1000 W / m2. The solar radiation simulator includes a plurality of halogen lamps, a reflector and a filter.

8. The device for detecting solar heat gain coefficient of building exterior windows according to claim 1, characterized in that: Also includes: An outdoor environment simulation room air conditioner, used to maintain a stable ambient temperature in the outdoor environment simulation room; The heat metering box environmental room air conditioner is used to maintain the ambient temperature of the heat metering box environmental room stable.

9. A control method for a solar heat gain coefficient detection device for building exterior windows, for use in claims 1-8 The control of the solar heat gain coefficient detection device for building exterior windows according to any one of the above items is characterized in that: The method comprises: Regulating the temperature of the heat metering box environmental chamber and the outdoor environment simulation chamber according to preset standards; Adjusting the water bath device in the cooling circulation system to a preset temperature and starting the cooling circulation system; Continuously collect the average temperature inside the heat metering box, the temperature on both sides of the heat metering box wall, the average temperature inside the outdoor environment simulation room, the temperature on both sides of the specimen frame, the flow rate in the cooling circulation system, and the supply and return water temperatures; Turn on the solar radiation simulator, complete data collection at preset intervals, and obtain the solar heat gain coefficient based on the calibrated calculation formula.

10. The control method of the building exterior window solar heat gain coefficient detection device according to claim 9, characterized in that: The calibration test calculation formula is: SHGC′·I′·A=G′C′ρ′·(t c ′-t j ′)+(t jln ′-t jlw ′)·M1+(t kn ′-t kw ′)·M2+(t gn ′-t gw ′)·M3 SHCC″·I″·A=G″C″ρ″·(t c ″-t j ″)+(t jln ″-t jhw ″)·M1+(t kn ″-t kw ″)·M2+(t gn ″-t gw ″)·M3 SHGC″′·I″′·A=G″′C″′ρ″′·(t c ″′-t j ″′)+(t jln ″′-t jlw ″′)·M1+(t kn ″′-t kw ″′)·M2+(t gn ″′-t gw ″′)·M3 Among them, S H GC represents the solar heat gain coefficient of the test piece in the three calibration experiments, / represents the radiant heat of the artificial simulated outdoor environment solar radiation incident on the surface of the test piece in the three calibration experiments, A represents the effective area of ​​the test piece in the calibration test, G represents the water flow rate in the cooling circulation system, C represents the specific heat of water in the cooling circulation system, ρ represents the water density in the cooling circulation system, M 1. M 2. M 3 represents the heat flow coefficient of heat metering box, test piece frame and glass, t c , t j Indicates the fluid outlet temperature and fluid inlet temperature, t jl , t jlw Indicates the inner surface temperature of the outer wall of the heat metering box and the outer surface temperature of the outer wall of the heat metering box, t kn , t kw Indicates the surface temperature inside and outside the specimen frame, t gn , t gw Indicates the inner surface temperature and outer surface temperature of the tested piece; The calculation formula for the solar heat gain coefficient is: Q gain =GCρ·(t c -t j )+(t jln -t jlw )·M1+(t kn -t kw )·M2+(t gn -t gw )·M3 Among them, Q gain is the heat gain coefficient of the test piece.

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