On-site detection and evaluation method and system for overall thermal insulation performance of building

Abstract

The invention relates to an on-site detection and evaluation method and system for the overall thermal insulation performance of a building, and the method comprises the following steps: firstly, in cloudy days and weather with small day-night temperature difference, arranging detection instruments and sensors in a detected building, and arranging temperature sensors in six outdoor directions; secondly, all doors and windows of the detected building are closed, all doors and windows upstairs and downstairs are opened, a heater is turned on, and indoor and outdoor constant temperature difference is constructed; then, steady-state judgment is conducted in the heat transfer process, and a heat loss coefficient measured value after the heat transfer process enters the steady state is calculated; and finally, comparing the measured value of the heat loss coefficient with the theoretical value, and giving an evaluation result. The method has the advantages that the indoor and outdoor temperature difference equivalent calculation method, the heat transfer process steady-state judgment method and the building overall thermal insulation performance on-site evaluation method are provided, the influence of various complex factors of on-site detection is considered, the detection method is more scientific, reasonable and accurate, and the blank of on-site detection and evaluation of the building overall thermal insulation performance in current specifications is filled.

Description

Technical Field

[0001] This invention relates to the field of residential performance evaluation technology, and in particular to a method and system for on-site testing and evaluation of the overall thermal insulation performance of buildings. Background Technology

[0002] Building energy consumption accounts for more than half of the total energy consumption of society. Improving the overall thermal insulation performance of buildings helps reduce energy consumption for summer cooling and winter heating, which is of great significance for achieving dual-carbon goals. At present, the evaluation of the overall thermal insulation performance of buildings is still at the design stage. When the heat transfer coefficient index K value of each component of a building (such as walls, roofs, windows, etc.) meets the requirements of energy-saving design standards, the building is considered to have passed the energy-saving performance evaluation. However, the actual energy-saving performance of a building during actual operation is affected by a variety of factors such as the quality of building components, construction quality and technology, and building airtightness, and its overall thermal insulation performance index differs significantly from the energy-saving design requirements. Current standards such as GB / T 34342 "Test Method for Heat Transfer Coefficient of Building Envelope", GB / T 34606 "Evaluation Method for Overall Energy-Saving Performance of Building Envelope", and JGJ / T 357 "Technical Specification for On-site Testing of Heat Transfer Coefficient of Building Envelope" only specify the testing and evaluation of the energy-saving performance of the building envelope in completed buildings, and do not specify the on-site testing and evaluation methods for the overall thermal insulation performance of buildings.

[0003] Invention patent ZL202311427942.3, "A Subject and Method for Testing the Overall Thermal Insulation Performance of Buildings," proposes a laboratory testing method based on a large-scale laboratory and a full-scale building model. This method first requires establishing a large, full-scale, all-weather environmental simulation laboratory. Then, within the laboratory, a test building of no more than two stories is constructed at a 1:1 scale according to the actual building's floor plan. Finally, the overall thermal insulation performance is tested under standard conditions. This testing method has the following drawbacks: (1) The construction of a large-scale full-scale all-weather environment simulation laboratory is expensive, and building a 1:1 scale test building cannot fully reflect the actual construction status of the on-site building; (2) Only one apartment type can be detected at a time, and it is not possible to detect all apartment types in a newly built community; (3) The detection method achieves a stable state of heat transfer by creating a constant temperature difference between indoors and outdoors, without considering the inconsistent outdoor temperatures caused by complex conditions such as sunlight and shadows. (4) Only the overall thermal insulation performance index is given, without evaluating the quality of the overall thermal insulation performance.

[0004] Therefore, this case is brought. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for on-site testing and evaluation of the overall thermal insulation performance of buildings. It takes into account the influence of various complex factors in on-site testing, can conduct tests on different types of housing, and can make a reasonable evaluation of the actual energy-saving effect of existing or newly built buildings.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A method for on-site testing and evaluation of the overall thermal insulation performance of a building includes the following steps: S1. Conduct an overall thermal insulation performance test in weather conditions with no sunlight and a day-night temperature difference not exceeding a preset threshold. S2. An air temperature sensor, a heater, a power meter, a temperature controller, and a recorder are installed in each room of the target household in the inspected building. The air temperature sensor is used to collect the indoor air temperature of the target household in real time. The heater is used to raise the indoor air temperature. The power meter is used to record the heating power of the heater in real time. The temperature controller is used to adjust the power of the heater to maintain the indoor air temperature at the set value. The recorder is used to record the data of the air temperature sensor, the heater, the power meter, and the temperature controller in real time. S3. Air temperature sensors 2 are arranged on the four outer surfaces of the target household in the building under inspection, and air temperature sensors 3 are arranged in the rooms of the adjacent households above and below the target household in the building under inspection. The air temperature sensors 2 are used to collect the outdoor air temperature in the four directions of the target household in real time, and the air temperature sensors 3 are used to collect the indoor air temperature of the adjacent households in the two directions above and below the target household in real time. S4. Close all doors and windows of the target unit in the inspected building, and open all doors and windows of the adjacent units above and below the target unit in the inspected building; S5. Turn on the heaters, power meters, thermostats, and recorders in each room of the target unit in the inspected building, and set the temperature of the thermostats at the same time; S6. Perform steady-state determination of the heat transfer process. When the outdoor ambient temperature, the heater power measured by the power meter, and the indoor temperature of the target household in the tested building are constant, proceed to step S7. S7. Calculate the measured and theoretical values ​​of the heat loss coefficient for the target household in the inspected building; S8. Compare the measured and theoretical values ​​of the heat loss coefficient of the target households in the inspected building, and evaluate the energy-saving performance.

[0008] Furthermore, in step S1, the preset threshold is 5°C.

[0009] Furthermore, in step S5, the difference between the set temperature of the temperature controller and the outdoor temperature must be greater than a preset threshold of two.

[0010] Furthermore, the second preset threshold is 10°C.

[0011] Furthermore, in step S6, the steady-state determination of the heat transfer process includes the following steps: The ambient temperature is constant: the absolute value of the hourly change in the average outdoor air temperature does not exceed 1 K within 1 hour. Constant heat source power: Within 1 hour, the absolute value of the hourly change in the input power of a single heater should not exceed 50 W and the change trend should not be a unidirectional monotonic change. Constant indoor temperature: Within one hour, the average indoor air temperature should simultaneously meet the following requirements: the absolute value of the hourly change should not exceed 0.5 K and the trend of change should not be a unidirectional monotonic change.

[0012] Furthermore, in step S7, the calculation process for the measured value of the heat loss coefficient of the target household in the inspected building is as follows: S71. Calculate the heat loss coefficient of the target household in the inspected building within 3 hours after entering steady state, calculated every 5 minutes, using the following formula: Q i =ΣP i / (A·ΔT i ); In the formula, Q i ΣP represents the heat loss coefficient of the building under inspection at the i-th sampling time. i ΔT is the sum of the power of all heaters at the i-th sampling time; i The equivalent indoor and outdoor temperature difference at the i-th sampling point; A is the horizontal projected area enclosed by the outer surface of the exterior wall of the building under inspection; S72. Based on the calculated heat loss coefficient value in step S71, plot the curve of the heat loss coefficient value over time. When the error of six consecutive heat loss coefficient values ​​relative to their average value does not exceed 3%, and the values ​​do not change monotonically in one direction, take the average value of the six heat loss coefficient values ​​as the measured value Q of the heat loss coefficient of the target household in the inspected building. 实测 .

[0013] Furthermore, in step S71, during the i-th sampling, the equivalent temperature difference ΔT between indoors and outdoors is... i Calculate using the following formula: ΔT i =ΣK i A i Δt i / (ΣK i A i ); In the formula, K i The heat transfer coefficients of each enclosure component shall be determined according to the data or practices given in the construction drawings; A i Δt represents the area of ​​each enclosure component; i The measured temperature difference between the inner and outer surfaces of each enclosure component.

[0014] Furthermore, in step S7, the theoretical value of the heat loss coefficient Q for the target household in the inspected building is... 理论 The calculation formula is as follows: Q 理论 =ΣK i A i +VSC / A; In the formula, V is the volume of the building under test; S is the number of air changes; and C is the specific heat of air.

[0015] Furthermore, in step S8, the energy-saving performance evaluation includes the following processes: When 0.9Q 理论 ≤Q 实测 ≤1.1Q 理论 At that time, the overall thermal insulation performance of the target households in the inspected building was basically consistent with the thermal insulation practices required by the design drawings, and was evaluated as "qualified"; When 1.1 Q 理论 <Q 实测 At that time, the overall thermal insulation performance of the target households in the inspected building did not meet the requirements of the design drawings and was evaluated as "unqualified". When Q 实测 <0.9Q 理论 At that time, the overall thermal insulation performance of the target households in the inspected building was better than the requirements of the design drawings, and was rated as "excellent".

[0016] A system for on-site testing and evaluation of the overall thermal insulation performance of a building using the above method, comprising: Air temperature sensor 1 is placed in each room of the target household in the building under inspection to collect indoor air temperature in real time; Air temperature sensor 2 is placed on the outer sides of the front, back, left, and right facades of the target unit in the building under inspection to collect outdoor air temperature in the four directions. Air temperature sensor three is placed in the rooms of adjacent units above and below the target unit in the building under test, and is used to collect the indoor air temperature of adjacent units in the two directions above and below. Heaters are placed in each room of the target unit in the inspected building to raise the indoor air temperature; Power meters are installed in each room of the target unit in the building under inspection to record the heating power of the heaters in real time. The temperature controller is installed in each room of the target unit in the building under inspection to adjust the heater power to maintain the indoor air temperature at the set value. The recorder is placed in each room of the target unit in the inspected building to record data from the air temperature sensor, heater, power meter, and temperature controller in real time. The data processing and evaluation unit is used to receive data from the recorder, air temperature sensor 2, and air temperature sensor 3, and calculate the measured value of the heat loss coefficient based on the received data; it is also used to calculate the theoretical value of the heat loss coefficient, and evaluate the energy-saving performance by comparing the measured value and the theoretical value of the heat loss coefficient of the target household in the inspected building.

[0017] The advantages of this invention are:

[0018] 1. This invention proposes a method for testing and evaluating the overall energy-saving performance of existing buildings, filling a gap in current standards and applicable to energy-saving renovation of existing buildings and energy-saving assessment of new buildings.

[0019] 2. This invention fully considers the fact that the temperature of the six sides of the target building under inspection is different in actual conditions. It uses the design value of area and heat transfer coefficient as weights to perform weighted averaging, which is more accurate than the traditional average temperature method or simple area weighting method. It solves the core technical problem of uneven temperature field in complex on-site environments.

[0020] 3. This invention proposes a steady-state determination method for on-site testing of building thermal insulation performance. Compared with the single working condition of laboratory testing, this method considers more complex factors and the determination method is more universal and scientific.

[0021] 4. This invention proposes a graded evaluation system that compares the measured Q value with the theoretical Q value, avoiding the limitations of directly using the absolute value of the Q value for evaluation, and conforming to the actual evaluation logic of engineering. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the on-site testing and evaluation method for the overall thermal insulation performance of a building, as shown in the embodiment. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments.

[0024] like Figure 1 As shown in the figure, this embodiment proposes a method for on-site testing and evaluation of the overall thermal insulation performance of a building, including the following steps.

[0025] Step S1. Select autumn or winter weather with no sun exposure or as much cloud cover as possible and small temperature difference between day and night to conduct the overall thermal insulation performance test, to prevent solar heat radiation from affecting the steady state of indoor heat transfer. The temperature difference between day and night should not exceed 5℃.

[0026] Choosing to conduct tests on days with minimal diurnal temperature variation is primarily to reduce the impact of drastic ambient temperature fluctuations on the stability of the heat transfer process. The thermal response of building envelopes exhibits hysteresis and heat storage effects. If the diurnal temperature difference is too large (e.g., exceeding 5°C), continuous changes in outdoor temperature will cause the heat flow through components such as walls and roofs to constantly adjust, making it difficult for the system to reach the required "quasi-steady-state" heat transfer conditions. This affects the accuracy and repeatability of the heat loss coefficient measurement, ensuring that the measured data truly reflects the overall thermal insulation performance of the building.

[0027] Step S2. Install an air temperature sensor, a heater, a power meter, a temperature controller, and a network-enabled recorder in each room of the target unit in the inspected building. The air temperature sensor should ideally be positioned at half the room's ceiling height, without contact with furniture or walls, to collect real-time indoor air temperature data. The power meter records the heater's power in real-time, and the temperature controller adjusts the heater's power to maintain the indoor air temperature at the set value. The network-enabled recorder remotely reads data from the air temperature sensor, heater, power meter, and temperature controller in real-time, allowing the backend system to calculate the heat loss coefficient Q to determine if a steady state has been reached.

[0028] Step S3. Install air temperature sensors two on all four outer surfaces of the target unit in the building under inspection, front, back, left, and right. Air temperature sensors two should be suspended and not in contact with the outer surfaces to prevent inaccurate outdoor air temperature monitoring. Install one air temperature sensor three in each of the adjacent units above and below the target unit (for example, in this experiment, the target unit is on the third floor of Unit 1, Building 2, and its adjacent units above and below it are on the second and fourth floors of Unit 1, Building 2). Air temperature sensors two are used to collect outdoor air temperature data in real time from the four directions of the target unit, and air temperature sensors three are used to collect indoor air temperature data in the two adjacent units above and below the target unit.

[0029] Step S4. Close all doors and windows of the target unit in the inspected building to ensure the interior is in a relatively sealed state; open all doors and windows of the adjacent units above and below the target unit in the inspected building, so that the adjacent units are the same as the external environment. The temperature measured at the adjacent units is the outdoor air temperature, specifically the outdoor air temperature above and below the target unit. Combined with the outdoor air temperature measured on the four outer surfaces of the target unit in step S3, we can obtain the outdoor ambient temperature of the target unit in the actual situation on the six sides (top, bottom, front, back, left, and right). This allows for a more accurate six-way (top, bottom, front, back, left, and right) equivalent temperature difference when calculating the overall heat loss, thus improving the detection accuracy.

[0030] Step S5. Turn on the heaters, power meters, temperature controllers, and network-enabled recorders in each room of the inspected building. Set the temperature controller to 20°C, creating a temperature difference of more than 10°C between the temperature controller and the outdoor temperature. A larger temperature difference ensures the accuracy of the heat loss coefficient Q value calculation.

[0031] Step S6. Perform steady-state determination of the heat transfer process. When the outdoor ambient temperature, the heater power measured by the power meter, and the indoor temperature of the target unit in the tested building are constant, proceed to step S7. The steady-state determination of the heat transfer process includes the following steps:

[0032] The ambient temperature is constant: the absolute value of the hourly change in the average outdoor air temperature does not exceed 1 K within 1 hour.

[0033] Constant heat source power: Within 1 hour, the absolute value of the hourly change in the input power of a single heater should not exceed 50 W and the change trend should not be a unidirectional monotonic change.

[0034] Constant indoor temperature: Within one hour, the average indoor air temperature should simultaneously meet the following requirements: the absolute value of the hourly change should not exceed 0.5 K and the trend of change should not be a unidirectional monotonic change.

[0035] Here, "K" is the symbol for the thermodynamic temperature unit "Kelvin," used to represent the absolute value of temperature change.

[0036] Step S7. Calculate the measured and theoretical values ​​of the heat loss coefficient for the target household in the inspected building.

[0037] The calculation process for the measured value of the heat loss coefficient of the target household in the inspected building is as follows: S71. Calculate the heat loss coefficient of the target household in the inspected building within 3 hours after entering steady state, calculated every 5 minutes, using the following formula: Q i =ΣP i / (A·ΔT i ); In the formula, Q i ΣP represents the heat loss coefficient of the building under inspection at the i-th sampling time. i ΔT is the sum of the power of all heaters at the i-th sampling time; i The equivalent indoor and outdoor temperature difference at the i-th sampling point; A is the horizontal projected area enclosed by the outer surface of the exterior wall of the building under inspection; S72. Based on the calculated heat loss coefficient value in step S71, plot the curve of the heat loss coefficient value over time. When the error of six consecutive heat loss coefficient values ​​relative to their average value does not exceed 3%, and the values ​​do not change monotonically in one direction, take the average value of the six heat loss coefficient values ​​as the measured value Q of the heat loss coefficient of the target household in the inspected building. 实测 .

[0038] Due to various environmental factors, the outdoor temperature of the inspected building may not be completely uniform across its front, back, sides, top, and bottom. Therefore, it is not possible to directly use the average value from outdoor air temperature sensors or the area-weighted average of the temperature and the corresponding outer surface. Furthermore, the insulation layer construction and window area differ for each outer surface; heat conduction is not only related to surface area but also to the heat transfer coefficients of each building envelope component. At the i-th sampling time, the equivalent indoor-outdoor temperature difference ΔT... i The weighted average value considering area and heat transfer coefficient is calculated using the following formula. The equivalent temperature difference ΔT between indoors and outdoors at the i-th sampling time is... i Calculate using the following formula: ΔT i =ΣK i A i Δt i / (ΣK i A i ); In the formula, K i The heat transfer coefficients of each enclosure component (including the ground and roof) are calculated and obtained according to the data or practices given in the construction drawings; A i Δt represents the area of ​​each enclosure component; i The difference between the indoor air temperature of the tested household and the outdoor air temperature in each direction (front, back, left, right, up, down) at the i-th sampling time.

[0039] Theoretical value of heat loss coefficient Q for the target household in the inspected building 理论 The calculation formula is as follows: Q 理论 =ΣK i A i +VSC / A; In the formula, V is the volume of the building under test; S is the number of air changes, which is taken according to the current national standard "Code for Design of Heating, Ventilation and Air Conditioning of Civil Buildings" GB50736; C is the specific heat of air, which is 1.005 kJ / (kg・℃) under standard conditions. If the ambient temperature deviates from the standard conditions by more than ±5℃, the specific heat of air corresponding to the actual temperature shall be taken.

[0040] Step S8. Compare the measured and theoretical values ​​of the heat loss coefficient for the target unit in the inspected building, and conduct an energy-saving performance evaluation. The energy-saving performance evaluation includes the following processes: When 0.9Q 理论 ≤Q 实测 ≤1.1Q 理论 At that time, the overall thermal insulation performance of the target households in the inspected building was basically consistent with the thermal insulation practices required by the design drawings, and was evaluated as "qualified"; When 1.1Q 理论 <Q实测 At that time, the overall thermal insulation performance of the target households in the inspected building did not meet the requirements of the design drawings and was evaluated as "unqualified". When Q 实测 <0.9Q 理论 At that time, the overall thermal insulation performance of the target households in the inspected building was better than the requirements of the design drawings, and was rated as "excellent".

[0041] Unlike laboratory testing methods, on-site testing conditions are demanding and highly susceptible to weather influences. This implementation method first requires conducting tests under conditions of minimal diurnal temperature variation and no solar heat radiation to facilitate the tested building's rapid stabilization in heat transfer. All doors and windows on both floors of the tested building must be fully open to ensure uniform heat conduction. A stable temperature difference between the indoor and outdoor areas is established using heaters. When stable heat transfer is achieved, the sum of the power of all heaters represents the amount of heat stably conducted outwards by the tested building, characterized by the heat loss coefficient Q. When the tested building has good insulation performance, less heat is conducted outwards per unit time, and vice versa. Therefore, the heat loss coefficient Q can be used to characterize the overall insulation performance of the tested building. During on-site testing, the temperatures of the six surfaces of the tested building are affected by environmental factors such as airflow, resulting in inconsistent temperatures. Therefore, an equivalent calculation method for the indoor-outdoor temperature difference is proposed, which considers the weighted average of the heat transfer coefficient and area of ​​each external surface envelope, providing a more accurate measurement of the building's overall insulation performance.

[0042] Furthermore, as can be seen from the calculation formula for the heat loss coefficient Q, buildings with different floor areas will have different heat loss coefficients Q, even if the insulation methods for all external envelope components are the same. Therefore, the overall thermal insulation performance of a building cannot be directly evaluated based on the absolute value of the heat loss coefficient Q. Thus, this embodiment proposes an evaluation method that compares the heat loss coefficient Q with its theoretical value to assess whether the insulation construction of the target unit in the inspected building meets the requirements.

[0043] Furthermore, this embodiment also proposes a system for on-site testing and evaluation of the overall thermal insulation performance of buildings, including: Air temperature sensor 1 is placed in each room of the target household in the building under inspection to collect indoor air temperature in real time; Air temperature sensor 2 is placed on the outer sides of the front, back, left, and right facades of the target unit in the building under inspection to collect outdoor air temperature in the four directions. Air temperature sensor three is placed in the rooms of adjacent units above and below the target unit in the building under test, and is used to collect the indoor air temperature of adjacent units in the two directions above and below. Heaters are placed in each room of the target unit in the inspected building to raise the indoor air temperature; Power meters are installed in each room of the target unit in the building under inspection to record the heating power of the heaters in real time. The temperature controller is installed in each room of the target unit in the building under inspection to adjust the heater power to maintain the indoor air temperature at the set value. The recorder is placed in each room of the target unit in the inspected building to record data from the air temperature sensor, heater, power meter, and temperature controller in real time. The data processing and evaluation unit is used to receive data from the recorder, air temperature sensor 2, and air temperature sensor 3, and calculate the measured value of the heat loss coefficient based on the received data; it is also used to calculate the theoretical value of the heat loss coefficient, and evaluate the energy-saving performance by comparing the measured value and the theoretical value of the heat loss coefficient of the target household in the inspected building.

[0044] The above embodiments are only used to explain the concept of the present invention, and are not intended to limit the protection of the present invention. Any non-substantial modifications made to the present invention using this concept should fall within the protection scope of the present invention.

Claims

1. A method for detecting and evaluating the performance of a building as a whole in situ, characterized in that, The method comprises the following steps: S1. Whole heat preservation performance detection is performed in weather without sunlight and with a diurnal temperature difference not greater than a preset threshold value one; S2. An air temperature sensor one, a heater, a power meter, a temperature controller and a recorder are arranged in each room of the target house of the building under test, the air temperature sensor one is used to collect indoor air temperature in real time, the heater is used to increase indoor air temperature, the power meter is used to record heating power of the heater in real time, the temperature controller is used to adjust the heating power of the heater to maintain indoor air temperature at a set value, and the recorder is used to record data of the air temperature sensor one, the heater, the power meter and the temperature controller in real time; S3. Air temperature sensors two are arranged on four outer surfaces around the target house of the building under test, and air temperature sensors three are arranged in each room of adjacent houses on the floor above and the floor below the target house of the building under test, the air temperature sensors two are used to collect outdoor air temperature in four directions around the target house in real time, and the air temperature sensors three are used to collect indoor air temperature of adjacent houses in two directions above and below the target house in real time; S4. All doors and windows of the target house of the building under test are closed, and all doors and windows of adjacent houses on the floor above and the floor below the target house of the building under test are opened; S5. The heater, the power meter, the temperature controller and the recorder in each room of the target house of the building under test are turned on, and the temperature of the temperature controller is set; S6. Steady state determination of the heat transfer process is performed, when outdoor environment temperature, heating power measured by the power meter and indoor temperature of the target house of the building under test are constant, step S7 is performed; S7. The measured value and the theoretical value of the heat loss coefficient of the target house of the building under test are calculated; S8. The measured value and the theoretical value of the heat loss coefficient of the target house of the building under test are compared, and energy saving performance is evaluated.

2. The method for detecting and evaluating the performance of an integrated thermal insulation system in a building in situ as claimed in claim 1, wherein In step S1, the preset threshold value one is 5℃.

3. The method for detecting and evaluating the performance of a building as a whole in situ according to claim 1, wherein In step S5, the difference between the set temperature of the temperature controller and the outdoor temperature is greater than a preset threshold value two.

4. The method for detecting and evaluating the performance of a building as a whole in situ according to claim 3, wherein The preset threshold value two is 10℃.

5. The method for detecting and evaluating the performance of an integrated thermal insulation system in a building in situ as claimed in claim 1, wherein, In step S6, the steady state determination of the heat transfer process comprises the following processes: Constant environment temperature: in 1 h, the absolute value of the average outdoor air temperature change per hour is not greater than 1 K; Constant heat source power: in 1 h, the input power of a single heater should satisfy that the absolute value of the change per hour is not greater than 50 W and the change trend is not unidirectional and monotonic; Constant indoor temperature: in 1 h, the absolute value of the average indoor air temperature change per hour should satisfy that it is not greater than 0.5 K and the change trend is not unidirectional and monotonic.

6. The method for detecting and evaluating the performance of an entire building in situ according to claim 1, wherein, In step S7, the calculation process of the measured value of the heat loss coefficient of the target house of the building under test is as follows: S71. The heat loss coefficient of the target house of the building under test in 3 h after entering the steady state is calculated every 5 min, and the calculation formula is as follows: Q i =∑P i / (A·ΔT i ); wherein Q i is the heat loss coefficient of the building under test at the i-th sampling;∑P i is the sum of the powers of all heaters at the i-th sampling;ΔT i is the equivalent temperature difference between the indoor and outdoor at the i-th sampling;A is the horizontal projection area enclosed by the outer surface of the building under test; S72. Based on the heat loss coefficient calculation value of step S71, a curve of heat loss coefficient value change over time is drawn, when the error of 6 consecutive heat loss coefficient values relative to the average value thereof does not exceed 3%, and is not monotonically changed in one direction, the average value of the 6 heat loss coefficient values is taken as the measured value Q of the heat loss coefficient of the target house of the building under test 实测 .

7. The method for detecting and evaluating the performance of an integrated thermal insulation system in a building in situ as claimed in claim 6, wherein In step S71, at the i-th sampling, the indoor-outdoor equivalent temperature difference ΔT i is calculated according to the following formula: ΔT i =ΣK i A i Δt i / (ΣK i A i ); where K i is the heat transfer coefficient of each part of the envelope; A i is the area of each part of the envelope; Δt i is the measured temperature difference between the inner and outer surfaces of each part of the envelope.

8. The method for detecting and evaluating the performance of an integrated thermal insulation system in a building in situ as claimed in claim 1, wherein, In step S7, the theoretical value Q of the heat loss coefficient of the target building under inspection is calculated. 理论 The calculation formula is as follows: Q 理论 =ΣK i A i +VSC / A; In the formula, V is the volume of the building under test; S is the air change rate; and C is the specific heat of air.

9. The method for detecting and evaluating the performance of an integrated thermal insulation system in a building in situ as claimed in claim 1, wherein In step S8, the energy saving performance evaluation comprises the following processes: When 0.9Q 理论 ≤ Q 实测 ≤ 1.1Q 理论 , the overall thermal insulation performance of the target building and the thermal insulation method required by the design drawing are basically consistent, and the evaluation is "qualified"; When 1.1Q 理论 <Q 实测 The overall thermal insulation performance of the target building does not meet the requirements of the design drawings, and is evaluated as "unqualified". When Q 实测 <0.9Q 理论 At that time, the overall thermal insulation performance of the target households in the inspected building was better than the requirements of the design drawings, and was rated as "excellent".

10. A building integrated thermal performance field testing and evaluation system for use in the method of any one of claims 1 to 9, characterized in that, The method comprises the following steps: The air temperature sensor one is arranged in each room of the target house of the building under test and is used to collect indoor air temperature in real time. Air temperature sensor two, arranged on the outside of the front, back, left and right four outer walls of the target building, for collecting the outdoor air temperature of the front, back, left and right four directions; Air temperature sensor three, arranged in the adjacent room of the target building on the upper and lower floors, for collecting the indoor air temperature of the adjacent room of the upper and lower two directions; Heater, arranged in each room of the target building, for increasing the indoor air temperature; Power meter, arranged in each room of the target building, for recording the heating power of the heater in real time; Temperature controller, arranged in each room of the target building, for adjusting the power of the heater to maintain the indoor air temperature at a set value; Recorder, arranged in each room of the target building, for recording the data of the air temperature sensor one, heater, power meter and temperature controller in real time; Data processing and evaluation unit, for receiving the data of the recorder, air temperature sensor two and air temperature sensor three, and calculating the measured value of the heat loss coefficient according to the received data; also for calculating the theoretical value of the heat loss coefficient, and comparing the measured value of the heat loss coefficient of the target building with the theoretical value to evaluate the energy saving performance.

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