GB/T 32981-2016 in English
VALIDTest method for effective thermal conductivity of wall materials
- Issued on:2016-08-29
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
《GB/T 32981-2016墙体材料当量导热系数测定方法》由TC285（全国墙体屋面及道路用建筑材料标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
GB/T32981-2016 Standard Overview
GB/T32981-2016 is a national standard of the People's Republic of China, and its full name is "Determination Method of Equivalent Thermal Conductivity of Wall Materials". The standard was issued in 2016 and implemented in 2017. It is mainly applicable to the determination of equivalent thermal conductivity of heterogeneous wall materials.
Background and Significance of Standard Formulation
With the improvement of building energy-saving requirements, the thermal performance of wall materials has become an important indicator for evaluating their quality. The formulation of GB/T32981-2016 fills the gap in the domestic determination method of thermal conductivity of heterogeneous wall materials and provides a scientific basis for building energy-saving assessment.
Comparison of standard frameworks
| Dimensions | GB/T32981-2016 | International comparison | Differences in industry standards |
|---|---|---|---|
| Scope of application | Non-homogeneous wall materials | ISO-related standards are mainly applicable to homogeneous materials | Other domestic standards focus on a single material |
| Determination principle | Steady heat transfer method | Consistent with international general methods | Some domestic standards use transient methods |
| Device requirements | Five parts: cold box, protective hot box, metering box, specimen frame and control system | International standards are usually simplified to cold box and hot box | Some domestic standards do not specify the device details |
Measurement device and principle
Structure of measurement device:
- Cold box: Provides a constant low temperature environment, with heating and cooling systems inside.
- Protective hot box: Reduces heat loss in the metering box, and requires high internal surface materials.
- Metering box: Simulates the heat transfer process of the wall, and the structure needs to be insulated and without cold bridges.
- Specimen frame: Install the specimen to ensure sealing and size matching.
- Control and data acquisition system: Achieve accurate measurement of temperature and heat flow.
Test method and calculation
Measurement steps:
- Prepare the filler (such as polystyrene board) and install it in the specimen frame.
- Set the temperature of the cold box and the hot box and monitor the stable state.
- Collect heat flow data and calculate the equivalent thermal conductivity λe.
Formula interpretation:
Q2 = QS - QT: Heat flow difference after the specimen is installed.Q = Q1 + Q2: Total heat flow calculation.λe = Q × d / (S × (T2 - T1) × k): Equivalent thermal conductivity formula, where k is the correction factor.
Implementation Suggestions
The following points should be noted in actual application:
- Ensure the stability of the test environment, especially the temperature and humidity control.
- Choose appropriate filling materials and verify the accuracy of their thermal conductivity.
- Avoid interference factors during data collection, such as equipment failure or operating errors.
- Regularly calibrate the measuring device to ensure measurement accuracy.
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