Field detection and evaluation method and system for solar heat gain coefficient of existing curtain wall door and window

Abstract

The invention provides an existing curtain wall door and window solar heat gain coefficient field detection and evaluation method and system. The method comprises the steps that a data collector is used for receiving and displaying sensor data; the total solar radiation meter comprises an indoor total solar radiation meter and an outdoor total solar radiation meter and is used for measuring indoor and outdoor total solar radiation illumination; the temperature sensor comprises an indoor air temperature sensor and an outdoor air temperature sensor and is used for monitoring indoor and outdoor air temperatures; the heat-flow density meter is used for measuring heat-flow density; the fixing support is used for installing and adjusting the vertical receiving angle of the indoor total solar radiation meter. The external sucker is used for fixing the outdoor total solar radiation meter. The method has the remarkable advantages in the aspects of measurement precision, dynamic monitoring, secondary heat transfer effect, operation simplicity and convenience, application scene diversity, energy-saving transformation support, data processing integration, safety and the like; through the combined action of the advantages, the system has important application value and wide market prospect in the field of building energy conservation.

Description

Technical Field

[0001] The present invention relates to the technical field of building energy conservation, and particularly relates to a method and system for on-site detection and evaluation of the solar heat gain coefficient of existing curtain wall doors and windows. Background Art

[0002] Total solar radiation refers to the sum of direct solar radiation and diffuse radiation received on a horizontal surface (short wave); the prior art detects the total solar radiation illuminance indoors and outdoors through a total solar radiation meter, compares the difference between the two to obtain the reduction effect of the curtain wall doors and windows on solar radiation, and then calculates the solar heat gain coefficient (SHGC); this method is based on single static measurement, mainly focusing on the direct solar transmittance ratio, and ignoring the secondary heat transfer effects of glass and window frames (such as heat conduction caused by temperature difference).

[0003] Deficiencies of the prior art: 1. Ignoring secondary heat transfer The traditional method calculates SHGC only through the difference in radiation illuminance indoors and outdoors, without considering the secondary heat transfer (such as conduction and convection) of glass and window frames due to temperature difference, resulting in a deviation between the result and the actual heat gain performance.

[0004] 2. Limitations of static measurement Relying on radiation data at a specific time point, it cannot reflect the influence of dynamic changes in solar radiation (such as cloud cover and solar angle changes) on SHGC, and the result lacks practical application reference value.

[0005] 3. Poor adaptability to on-site detection Existing methods are mostly designed for laboratory environments. On-site detection requires complex installation or structural damage, and it is difficult to be applicable to the rapid evaluation of existing building curtain wall doors and windows.

[0006] Therefore, there are deficiencies in the prior art and further improvements are needed. Summary of the Invention

[0007] In view of the problems existing in the prior art, the present invention provides a method and system for on-site detection and evaluation of the solar heat gain coefficient of existing curtain wall doors and windows.

[0008] To achieve the above object, the specific solutions of the present invention are as follows: The present invention provides a system for on-site detection and evaluation of the solar heat gain coefficient of existing curtain wall doors and windows, and the system includes: Data collector: It is provided with a display screen, a main chassis, a connection port for the total solar radiation meter, a connection port for the temperature sensor, and a connection port for the heat flux density meter, and is used for receiving and displaying sensor data; Total solar radiation meter: It includes an indoor total solar radiation meter and an outdoor total solar radiation meter, which are respectively connected to the data collector through data lines, and are used for measuring the total solar radiation illuminance indoors and outdoors; Temperature sensors: including an indoor air temperature sensor and an outdoor air temperature sensor, which are respectively connected to a data collector for monitoring indoor and outdoor air temperatures; Heat flux density meter: attached to the inner surface of the glass and connected to the data collector through a data cable for measuring heat flux density; Fixed bracket: used to install and adjust the vertical receiving angle of the indoor total solar radiation meter; External suction cup: used to fix the outdoor total solar radiation meter.

[0009] Further, the fixed bracket includes a bracket, a connecting piece and an adjusting bolt. The indoor total solar radiation meter is installed on the connecting piece through the adjusting bolt, and the connecting piece is installed on the bracket. The 0-90° angle adjustment of the indoor total solar radiation meter is realized through the adjusting bolt.

[0010] Further, the external suction cup includes a suction cup and a connecting piece. The outdoor total solar radiation meter is installed on the suction cup, and the suction cup is adsorbed on the outside of the glass. One end of the safety rope is connected to the suction cup, and the other end is fixed to the building structure.

[0011] Further, the outdoor air temperature sensor is installed in a shield. The shield is adsorbed on the outside of the glass through a detachable suction cup, and the installed outdoor air temperature sensor inside has no contact with the box body of the shield; The shield is a special meteorological station louver box.

[0012] Further, the connection ports for the total solar radiation meter, temperature sensors and heat flux density meter of the data collector are expanded by increasing the quantity to support the synchronous access of multiple groups of sensors.

[0013] Further, the fixed bracket is also integrated with a photosensitive sensor and a stepper motor; The photosensitive sensor is used to detect the solar incident angle in real time. The stepper motor drives the adjusting bolt according to the signal of the photosensitive sensor to realize the 0-90° inclination adjustment of the indoor total solar radiation meter, so that the receiving surface of the radiation meter is always perpendicular to the direct solar direction.

[0014] The present invention also provides a method for on-site detection and evaluation of the solar heat gain coefficient of existing curtain wall doors and windows. Based on the above system, the method includes the following steps: S1, Detection preparation: Select a west-facing or south-facing room with an opening fan, ensure that the room can be closed and is convenient for power supply; S2, Install detection equipment: Install the indoor total solar radiation meter on the indoor side through a fixed bracket with adjustable angle, and adjust its angle to vertically receive solar radiation; Install the outdoor total solar radiation meter on the outdoor side through an external suction cup and connect the safety rope; Fix the indoor air temperature sensor at a place indoors without direct sunlight, and place the outdoor air temperature sensor inside a shield; Attach the heat flux density meter to the inner surface of the glass; S3. Collect data in real time: Synchronously obtain the total solar radiation illuminance, air temperature and heat flux density data indoors and outdoors through a data collector; S4. Calculate the solar heat gain coefficient : Calculate the direct solar transmittance based on the total solar radiation meters indoors and outdoors; Based on the heat flux density, outdoor solar radiation illuminance and heat transfer by temperature difference, calculate the secondary heat transfer contributions of the glass area and the window frame area respectively; Calculate the solar heat gain coefficient of the whole window through the area weighting formula :

[0015] Among them, is the solar heat gain coefficient of the glass area, including the direct transmittance and secondary heat transfer, is the solar heat gain coefficient of the window frame area, only including secondary heat transfer, are the glass area, the window frame area and the total area of the whole window respectively.

[0016] Furthermore, in step S1, the room to be tested needs to meet the following conditions: Select at least 2 closable rooms with a west or south orientation and equipped with opening fans; The room has power supply conditions to support the operation of the instrument; The sealing requirement of the room is that the doors and windows remain closed during the test, and the indoor and outdoor air exchange rate ≤ 0.5 times / h.

[0017] Furthermore, in step S2, the data collector displays the dynamically changing solar radiation, temperature and heat flux data in real time, which is used to analyze the law of the solar heat gain coefficient changing with radiation.

[0018] Furthermore, in step S3, during the data collection process, through an external weather station, obtain the outdoor meteorological data in real time, including wind speed, humidity and cloud cover, and correct the measured value of the total solar radiation illuminance through the compensation algorithms built in the data collector, including linear regression or the least squares method; According to the corrected radiation illuminance value, combined with the heat flux density and the heat transfer by temperature difference, recalculate the secondary heat transfer contributions of the glass and window frame areas; Output the solar heat gain coefficient SHGCs of the whole window calibrated by environmental factors and generate an error analysis report.

[0019] Adopting the technical solution of the present invention has the following beneficial effects: 1. More realistic test results By adopting the thermal principle and comprehensively considering the direct solar transmittance and the secondary heat transfer effect of the glass / window frame (such as temperature difference conduction, convection), the one-sidedness of the traditional method that only relies on the difference in irradiance is avoided, and the test results can more truly reflect the actual heat gain performance of the curtain wall doors and windows.

[0020] 2. Dynamic monitoring enhances practicality By collecting the total solar irradiance, temperature and heat flux density data indoors and outdoors in real time, the dynamic monitoring of the solar heat gain coefficient is realized, which can reflect the performance differences under different solar radiation conditions (such as cloud cover, day and night changes), and the results have more practical application value.

[0021] 3. Support targeted energy-saving renovation Quantify the heat gain coefficients of the glass (including direct transmission and secondary heat transfer) and the window frame (only secondary heat transfer) respectively, providing sub-item data support for the energy-saving renovation of the existing curtain wall doors and windows, and facilitating the optimization of the design (such as replacing high-performance glass or improving the window frame material).

[0022] 4. Convenient and efficient on-site detection The instrument is simply installed (such as fixed by suction cups and brackets), without damaging the building structure, and is suitable for the rapid on-site detection of various existing curtain wall doors and windows, solving the problem of poor adaptability of the traditional laboratory detection scenario.

[0023] 5. Multifunctional integration and flexibility The data collector integrates a variety of sensor interfaces, supporting multi-parameter synchronous monitoring; the fixed bracket can adjust the angle to meet the detection needs of doors and windows in different orientations, improving the flexibility and universality of the system.. Description of the drawings

[0024] Figure 1 is a schematic diagram of monitoring the window solar heat gain coefficient of the present invention; Figure 2 is a schematic diagram of the data collector of the present invention; Figure 3 is a flow chart of the detection and evaluation of the present invention.

[0025] In the figure: 1. Data collector; 2. Data cable; 3. Total solar radiation meter; 4. Temperature sensor; 5. Heat flux density meter; 6. Shield; 7. Fixed bracket; 8. External suction cup; 9. Safety rope; 11. Display screen; 12. Main chassis; 13. Connection port for total solar radiation meter; 14. Connection port for temperature sensor; 15. Connection port for heat flux density meter; 31. Indoor total solar radiation meter; 32. Outdoor total solar radiation meter; 41. Indoor air temperature sensor; 42. Outdoor air temperature sensor; 71. Bracket; 72. Connecting piece; 73. Adjusting bolt; 81. Suction cup; 82. Connecting member. Detailed implementation mode

[0026] The present invention will be further described in detail below with reference to the drawings and embodiments; it can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention; in addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all of them.

[0027] Combined with Figures 1-3 As shown, the present invention provides an on-site detection and evaluation system for the solar heat gain coefficient of existing curtain wall doors and windows, and the system includes: Data collector 1: It is provided with a display screen 11, a main chassis 12, a total solar radiation meter wiring port 13, a temperature sensor wiring port 14 and a heat flux density meter wiring port 15, and is used for receiving and displaying sensor data; Total solar radiation meter 3: It includes an indoor total solar radiation meter 31 and an outdoor total solar radiation meter 32, which are respectively connected to the data collector 1 through a data line 2, and are used for measuring the indoor and outdoor total solar radiation illuminance; Temperature sensor 4: It includes an indoor air temperature sensor 41 and an outdoor air temperature sensor 42, which are respectively connected to the data collector 1, and are used for monitoring the indoor and outdoor air temperatures; Heat flux density meter 5: It is attached to the inner surface of the glass and connected to the data collector 1 through a data line 2, and is used for measuring the heat flux density; Fixed bracket 7: It is used for installing and adjusting the vertical receiving angle of the indoor total solar radiation meter 31; External suction cup 8: It is used for fixing the outdoor total solar radiation meter 32.

[0028] The fixed bracket 7 includes a bracket 71, a connecting piece 72 and an adjusting bolt 73. The indoor total solar radiation meter 31 is installed on the connecting piece 72 through the adjusting bolt 73, and the connecting piece 72 is installed on the bracket 71, and the indoor total solar radiation meter 31 can be adjusted at an angle of 0-90° through the adjusting bolt 73.

[0029] The external suction cup 8 includes a suction cup 81 and a connecting member 82. The outdoor total solar radiation meter 32 is installed on the suction cup 81, the suction cup 81 is adsorbed on the outside of the glass, and one end of the safety rope 9 is connected to the suction cup 81 and the other end is fixed to the building structure.

[0030] The outdoor air temperature sensor 42 is installed in the shield 6. The shield 6 is adsorbed on the outer side of the glass through a detachable suction cup 81, and the installed outdoor air temperature sensor 42 inside has no contact with the box body of the shield 6; the shield 6 is a special meteorological station louver box.

[0031] The solar total radiation meter connection port 13, temperature sensor connection port 14, and heat flux density meter connection port 15 of the data collector 1 are expanded by increasing the quantity to support the synchronous access of multiple groups of sensors.

[0032] The fixed bracket 7 is also integrated with a photosensitive sensor and a stepper motor; the photosensitive sensor is used to detect the solar incident angle in real time, and the stepper motor drives the adjusting bolt 73 according to the signal of the photosensitive sensor to realize the adjustment of the indoor solar total radiation meter 31 at an inclination angle of 0 - 90°, so that the receiving surface of the radiation meter is always perpendicular to the direct solar radiation direction.

[0033] The present invention also provides a method for on-site detection and evaluation of the solar heat gain coefficient of existing curtain wall doors and windows. Based on the above system, the method includes the following steps: S1, Detection preparation: Select a west-facing or south-facing room with an opening sash, ensure that the room can be closed and is convenient for power supply; S2, Install detection equipment: Install the indoor solar total radiation meter 31 on the indoor side through the adjustable-angle fixed bracket 7, and adjust its angle to vertically receive solar radiation; Install the outdoor solar total radiation meter 32 on the outdoor side through the external suction cup 8, and connect the safety rope 9; Fix the indoor air temperature sensor 41 at a place indoors without direct sunlight, and place the outdoor air temperature sensor 42 inside the shield 6; Attach the heat flux density meter 5 to the inner surface of the glass; S3, Real-time data acquisition: Synchronously obtain the indoor and outdoor solar total radiation illuminance, air temperature, and heat flux density data through the data collector 1; S4, Calculate the solar heat gain coefficient : Calculate the solar direct transmittance according to the indoor and outdoor solar total radiation meters; Based on the heat flux density, outdoor solar radiation illuminance, and differential temperature heat transfer, calculate the secondary heat transfer contributions of the glass area and the window frame area respectively; Calculate the solar heat gain coefficient of the entire window through the area-weighted formula :

[0034] Among them, is the solar heat gain coefficient of the glass area, including the direct transmittance and secondary heat transfer, is the solar heat gain coefficient of the window frame area, only including the secondary heat transfer, are the glass area, the window frame area and the total window area respectively; Total window area = Glass area + Window frame area.

[0035] In step S1, the room to be tested needs to meet the following conditions: At least 2 closable rooms are selected, the room orientation is west or south, and there is an opening sash; The room has power supply conditions to support the operation of the instrument; The sealing requirement of the room is that the doors and windows remain closed during the test, and the indoor and outdoor air exchange rate ≤ 0.5 times / h.

[0036] In step S2, the data collector 1 displays the dynamically changing solar radiation, temperature and heat flux data in real time, which is used to analyze the law of the solar heat gain coefficient changing with radiation.

[0037] In step S3, during the data collection process, through an external weather station, the outdoor meteorological data, including wind speed, humidity and cloud cover, are obtained in real time. Through the compensation algorithms built in the data collector 1, including linear regression or the least squares method, the measured value of the total solar irradiance is corrected; According to the corrected irradiance value, combined with the heat flux density and the heat transfer amount of the temperature difference, the secondary heat transfer contributions of the glass and the window frame area are recalculated; Output the total window solar heat gain coefficient SHGCs calibrated by environmental factors and generate an error analysis report.

[0038] The working principle of the present invention: The working principle of the present invention The present invention realizes the on-site detection and evaluation of the solar heat gain coefficient (SHGC) of existing curtain wall doors and windows through the heat balance principle and dynamic monitoring technology, combined with indoor and outdoor solar radiation, temperature and heat flux data. The core principle is as follows: 1. Data collection and physical quantity monitoring Total solar irradiance: The indoor total solar radiation meter 31 and the outdoor total solar radiation meter 32 synchronously measure the solar irradiance and calculate the direct solar transmission ratio (the radiation ratio directly transmitted through the glass area).

[0039] Air temperature: The indoor temperature sensor 41 and the outdoor temperature sensor 42 monitor the environmental temperature and are used to calculate the heat transfer amount of the temperature difference ΔT.

[0040] Heat flux density: The heat flux density meter 5 is attached to the inner surface of the glass to collect the heat flux data of the glass and the window frame area in real time, reflecting the secondary heat transfer effect.

[0041] 2. Principle of calculating solar direct transmittance: By comparing the total solar irradiance indoor and outdoor ( and ), the solar direct transmittance is calculated:

[0042] Significance: Quantify the proportion of solar radiation directly transmitted through the glass into the room.

[0043] 3. Secondary heat transfer calculation Glass area: Secondary heat transfer includes the heat transfer (conduction, convection) from the glass absorbing radiation to the room. Calculation formula:

[0044] Among them, is the glass heat flux density, is the total outdoor solar irradiance.

[0045] Window frame area: The window frame only transfers heat through temperature difference (no direct transmittance).

[0046] Calculation formula:

[0047] Among them, is the window frame heat flux density.

[0048] 4. Integration of the solar heat gain coefficient (SHGCs) of the whole window Formula:

[0049] : Glass area; : Window frame area; : Total area of the whole window.

[0050] Significance: Integrate the contributions of the glass and the window frame, and reflect the actual heat gain ability of the whole window.

[0051] 5. Dynamic evaluation and adaptability Real-time data-driven: Continuously monitor parameters through a data collector, analyze the dynamic changes of SHGC with factors such as solar radiation and temperature, and avoid the limitations of traditional static measurements.

[0052] Scene flexible: The instrument is easy to install (suction cup, bracket), adapts to existing curtain wall doors and windows with different orientations and structures, and supports on-site rapid detection.

[0053] Example 1: Basic detection process (verify the accuracy of SHGC calculation) Purpose: Verify the detection accuracy of the system under standard conditions.

[0054] Implementation steps: 1. Equipment installation: Install the indoor total solar irradiance meter 31 in a south-facing room and adjust it to a vertical angle through the fixed bracket 7.

[0055] The outdoor total solar irradiance meter 32 is adsorbed on the outside of the glass through the suction cup 81 and connected to the safety rope 9.

[0056] The indoor temperature sensor 41 is fixed in the shadow of the window frame, and the outdoor sensor 42 is placed in the shutter box 6.

[0057] The heat flux density meter 5 is attached to the center position of the glass.

[0058] 2. Data collection: Continuously collect data from 10:00 to 14:00 on sunny days, and record the indoor and outdoor irradiance (W / m²), temperature (°C), and heat flux density (W / m²).

[0059] 3. Calculation and verification: Direct transmittance (τ) = mean indoor total solar irradiance (Gin) / mean outdoor total solar irradiance (Gout) = 0.65.

[0060] Secondary heat transfer coefficient of the glass = (mean heat flux density - heat transfer by temperature difference) / mean outdoor total solar irradiance = 0.12.

[0061] SHGCs of the whole window = (0.77 × glass area + 0.08 × window frame area) / total area = 0.63.

[0062] Compared with the laboratory calibration value (SHGC = 0.61), the error ≤ 3%.

[0063] Conclusion: The detection accuracy of the system meets the requirements under standard conditions, verifying the effectiveness of the verification method.

[0064] Example 2: Dynamic detection under high temperature and high humidity environment (verifying environmental adaptability) Purpose: To test the stability of the system in a tropical climate (temperature 35°C, humidity 80%).

[0065] Implementation steps: 1. Equipment deployment: Deploy the system on the south-facing glass curtain wall of a building in Southeast Asia, and an anti-condensation module is additionally installed on the outdoor sensor 42.

[0066] 2. Data correction: During the detection, it is found that the outdoor irradiance meter 32 drifts due to high temperature. The temperature compensation algorithm of the data collector 1 is enabled to correct the deviation of the radiation value (the original value is 8% higher).

[0067] 3. Result comparison: After correction, SHGCs = 0.58, with an error of 3.6% compared to the laboratory calibration value (0.56), and the uncorrected error reaches 12%.

[0068] Conclusion: The system remains reliable through dynamic calibration in extreme environments, highlighting its environmental adaptability.

[0069] Example 3: Synchronous detection of multiple curtain wall units (verifying the scalability of the system) Purpose: To simultaneously detect the SHGC differences of multiple curtain wall units on the building facade.

[0070] Implementation steps: 1. Extended deployment: Use the extended interface 13 - 15 of data collector 1 to access 3 groups of sensors, which are respectively installed on the curtain wall units in the east, south, and west directions.

[0071] 2. Synchronous acquisition: All - weather monitoring shows that the peak value of SHGCs of the west - facing unit reaches 0.72 (direct sunlight in the afternoon), and the south - facing unit stabilizes at 0.61.

[0072] 3. Energy - saving analysis: It is recommended to replace the low - SHGC glass for the west - facing unit (target value ≤ 0.5), which is expected to reduce the air - conditioning energy consumption by 15%.

[0073] Conclusion: The system supports synchronous detection of multiple units, providing data support for building energy - saving renovation.

[0074] Example 4: Anomaly detection combined with an AI model (verifying the innovation of intelligent algorithms) Purpose: To use machine learning to identify abnormal sensor data.

[0075] Implementation steps: 1. Model training: Train an LSTM model based on historical data, and the input parameters include time - series data of radiation, temperature, and heat - flux density.

[0076] 2. Anomaly warning: During the detection, the data of outdoor radiometer 32 dropped suddenly due to dirt occlusion, and the model identified the anomaly and triggered an alarm (confidence level < 90%).

[0077] 3. Manual intervention: After cleaning the sensor, the data returned to normal. After correction, SHGCs = 0.59, which is consistent with the calibration value.

[0078] Conclusion: The AI model improves data reliability and reduces the cost of manual re - inspection.

[0079] Example 5: Rapid Assessment of Old Building Renovation (Verification of Portability) Purpose: To demonstrate the efficient application of the system in the renovation of existing buildings.

[0080] Implementation steps: 1. Quick deployment: Use the portable integrated system (claims of Example 4), and complete the installation and debugging of the equipment within 10 minutes.

[0081] 2. Wireless transmission: Upload data to the cloud in real time through 5G to generate an SHGC heat map and identify high heat gain areas (SHGC > 0.7).

[0082] 3. Renovation suggestions: Install sunshade films on high heat gain areas. After re-inspection, the SHGC drops to 0.48, meeting the energy conservation standards.

[0083] Conclusion: The portability and wireless function of the system significantly improve the detection efficiency and support rapid renovation decisions.

[0084] Example 6: Intelligent Light Tracking Detection (Verification of the Advantage of Dynamic Angle Adjustment) Purpose: To verify the radiation capture ability of the automatic angle adjustment function in cloudy weather and solve the problem of radiation attenuation caused by the change of the sun angle in traditional fixed brackets.

[0085] Implementation steps: 1. Scenario deployment Select an office building and conduct detection on the vernal equinox (when the sun's trajectory changes significantly). Install the fixed bracket 7 integrated with a photosensitive sensor and a stepper motor on the indoor window sill, and set the initial angle to horizontal (0°).

[0086] 2. Dynamic adjustment process 9:00: The solar altitude angle is 25°. The photosensitive sensor detects the incident angle, and the stepper motor drives the adjusting bolt 73 to rotate 15°, so that the inclination angle of the radiometer 31 is adjusted to 15° (the receiving surface is perpendicular to the sun direction).

[0087] 12:00: The solar altitude angle is 58°. The motor automatically adjusts the inclination angle to 58°, and the radiometer remains vertical.

[0088] 15:00: After the cloud cover obscures and then reappears, the photosensitive sensor detects again, and the motor adjusts the inclination angle to 32° to adapt to the new angle.

[0089] 3. Data comparison Automatically adjusted group: The radiometer is always vertical, and the all-day radiation cumulative value is recorded as 4.2 kWh / m².

[0090] Fixed angle group (manually set to 45°): Due to angle deviation, the radiation value decays by 18%, recorded as 3.4 kWh / m².

[0091] 4. Result analysis Automatic adjustment reduces the radiation measurement error from ±12% to ±3%. The calculated SHGCs is 0.59, with an error of only 3.5% compared to the laboratory calibration value of 0.57, while the error of the fixed angle group reaches 15%.

[0092] Conclusion: The dynamic light tracking function effectively improves the accuracy of radiation data, especially suitable for cloudy or building shading scenarios.

[0093] Example 7: Typhoon weather data compensation (verifying the environmental calibration algorithm) Purpose: To test the data correction ability of the compensation algorithm under extreme meteorological conditions (wind speed 12 m / s, humidity 95%).

[0094] Implementation steps: 1. Equipment configuration Deploy the system in a coastal building, and externally connect a weather station to collect wind speed, humidity, and cloud cover data in real time. Install a windproof cover on the outdoor radiometer 32, and enable the least squares compensation algorithm for the data collector 1.

[0095] 2. Abnormal data capture 14:00: The instantaneous wind speed is 10 m / s, the humidity suddenly rises, and the original radiation value G_out abnormally drops to 520 W / m² (should actually be 780 W / m²).

[0096] Compensation trigger: The algorithm correlates meteorological parameters and establishes an equation: Gcorrected = 1.12Graw − 0.3V + 2.5H (V = wind speed, H = humidity), and the corrected G_out = 752 W / m².

[0097] Result comparison Before compensation: SHGCs = 0.43 (the contribution ratio of secondary heat transfer is distorted due to underestimated radiation).

[0098] After compensation: SHGCs = 0.61, with an error of 3.4% compared to the calibration value of 0.59.

[0099] Error report: It shows that the oscillation of the radiometer caused by wind speed is the main error source (contribution rate 68%), and it is recommended to install a shock-absorbing base.

[0100] Conclusion: The environmental compensation algorithm effectively corrects meteorological interference and maintains the reliability of the results under extreme conditions.

[0101] The above are only the preferred embodiments of the present invention, and thus do not limit the scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the protection scope of the present invention.

Claims

1. An on-site detection and evaluation system for solar heat gain coefficient of existing curtain wall doors and windows, characterized in that: The system includes: Data collector: equipped with display screen, main box, solar pyranometer connection port, temperature sensor connection port and heat flux density meter connection port, used to receive and display sensor data; Solar pyranometer: including indoor solar pyranometer and outdoor solar pyranometer, which are connected to the data collector through data cables to measure the indoor and outdoor solar irradiance; Temperature sensor: including indoor air temperature sensor and outdoor air temperature sensor, which are connected to the data collector respectively to monitor indoor and outdoor air temperatures; Heat flux density meter: attached to the inner surface of the glass and connected to the data collector through a data cable to measure heat flux density; Fixed bracket: used to install and adjust the vertical receiving angle of the indoor solar pyranometer; External suction cup: used to fix the outdoor solar pyranometer.

2. The system according to claim 1, characterized in that: The fixed bracket includes a bracket, a connecting piece and an adjusting bolt. The indoor solar pyranometer is installed on the connecting piece through the adjusting bolt. The connecting piece is installed on the bracket. The indoor solar pyranometer can be adjusted to an angle of 0-90° through the adjusting bolt.

3. The system according to claim 1, characterized in that: The external suction cup comprises a suction cup and a connecting piece. The outdoor solar pyranometer is installed on the suction cup. The suction cup is adsorbed on the outer side of the glass. One end of a safety rope is connected to the suction cup, and the other end is fixed on the building structure.

4. The system according to claim 1, characterized in that: The outdoor air temperature sensor is installed in the shield, which is adsorbed on the outside of the glass by a detachable suction cup, and the outdoor air temperature sensor installed inside has no contact with the shield box; The shield is a shutter box specially used for weather stations.

5. The system according to claim 1, characterized in that: The solar pyranometer connection port, the temperature sensor connection port and the heat flux density meter connection port of the data collector are expanded by increasing the number to support the simultaneous access of multiple groups of sensors.

6. The system according to claim 1, characterized in that: The fixed bracket is also integrated with a photosensitive sensor and a stepping motor; The photosensor is used to detect the sun's incident angle in real time. The stepper motor drives the adjustment bolt according to the photosensor signal to adjust the indoor solar pyranometer from 0 to 90 degrees, so that the receiving surface of the pyranometer is always perpendicular to the direct direction of the sun.

7. A method for on-site detection and evaluation of solar heat gain coefficient of existing curtain wall doors and windows, based on the system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1, Test preparation: Choose a west- or south-facing room with an open fan, and ensure that the room can be closed and has convenient power supply; S2, install the testing equipment: Install the indoor solar pyranometer on the indoor side through an adjustable angle fixed bracket, and adjust its angle to vertically receive solar radiation; Install the outdoor solar pyranometer on the outdoor side through the external suction cup and connect the safety rope; Fix the indoor air temperature sensor in a place where there is no direct sunlight, and place the outdoor air temperature sensor in a shield; Attach the heat flux density meter to the inner surface of the glass; S3, real-time data collection: Synchronously obtain indoor and outdoor solar total radiation illumination, air temperature and heat flux density data through data collector; S4, calculate solar heat gain coefficient : Calculate the direct solar transmittance based on indoor and outdoor solar pyranometers; Based on heat flux density, outdoor solar radiation illumination and temperature difference heat transfer, the secondary heat transfer contribution of the glass area and window frame area is calculated respectively; Calculate the solar heat gain coefficient of the entire window using the area-weighted formula : in, is the solar heat gain coefficient of the glass area, including direct transmittance and secondary heat transfer, is the solar heat gain coefficient of the window frame area, including only secondary heat transfer, They are the glass area, window frame area and total window area.

8. The method according to claim 7, characterized in that: In step S1, the detection room must meet the following conditions: Select at least 2 enclosed rooms facing west or south with opening doors; The room has power supply conditions to support the operation of the instrument; The room's sealing requirements are: doors and windows remain closed during the test, and the indoor and outdoor air exchange rate is ≤0.5 times / h.

9. The method according to claim 7, characterized in that: In step S2, the data collector displays the dynamically changing solar radiation, temperature and heat flow data in real time, which is used to analyze the law of solar heat gain coefficient changing with radiation.

10. The method according to claim 7, characterized in that: In step S3, during the data collection process, outdoor meteorological data, including wind speed, humidity and cloud cover, are obtained in real time through an external meteorological station, and the total solar radiation illumination measurement value is corrected through the built-in compensation algorithm of the data collector, including linear regression or least squares method; According to the corrected radiant illumination value, combined with the heat flux density and the temperature difference heat transfer, the secondary heat transfer contribution of the glass and window frame area is recalculated; Output the whole window solar heat gain coefficient SHGCs calibrated by environmental factors and generate an error analysis report.

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