Test method for thermal insulating performance for building exterior doors and windows
1 Scope
This standard specifies the test principle, test device, test pieces and installation requirements, test and test report of the thermal insulating performance for building exterior doors and windows.
This standard is applicable to the thermal insulating performance test for vertical exterior doors and windows of buildings.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4132 Definitions of terms relating to thermal insulating materials
GB/T 5823 Terminology for building windows and doors
GB/T 10294 Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus
GB/T 13475 Thermal insulation - Determination of steady-state thermal transmission properties - Calibrated and guard hot box
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 4132 and GB/T 5823 and the following apply.
3.1
thermal insulating performance for building doors and windows
ability of building exterior doors and windows to prevent thermal transmission from indoor to outdoor, which is characterized by thermal transmittance
3.2
doors and windows thermal transmittance
thermal transmission capacity per unit area in unit time under the condition of steady-state thermal transmission when the air temperature difference between both sides of doors and windows is 1K
Note: It is revised from Definition 2.8.15 in GB/T 4132-2015.
3.3
thermal conductance
ratio of the thermal transmission capacity per unit area through the filler plate of certain thickness to the temperature difference between the two surfaces of the plate under the condition of steady-state thermal transmission
3.4
thermal current coefficient
thermal transmission capacity under the condition of steady-state thermal transmission when the temperature difference between the two surfaces of box wall or test piece frame in the hot box is 1K
4 Test principle
Based on the principle of steady-state thermal transmission, the thermal transmittance of building exterior doors and windows is tested by the calibrated hot box method. The hot box is on one side of the test piece, which simulates the indoor air temperature conditions of heated buildings in winter; the cold box is on the other side, which simulates outdoor air temperature and air flow rate in winter. Under the condition that the gaps of the test piece are sealed and both sides of the test piece are kept under stable air temperature, air flow rate and thermal radiation, measure the calorific value per unit time of the heating device in the hot box, subtract it by the heat loss passing through the hot box wall, the test piece frame, the filler plate and the edges of test piece and filler plate, and then divide the value by the product of the area of the test piece and the air temperature difference between both sides, so as to obtain the thermal transmittance K value of the test piece.
5 Test device
5.1 Composition of test device
The test device mainly consists of five parts: hot box, cold box, test piece frame, filler plate and environmental space, as shown in Figure 1.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Test principle
5 Test device
6 Test pieces and installation requirements
7 Test
8 Test report
Annex A (Normative) Calibration of thermal current coefficient
Annex B (Normative) Calculation of weighted average temperature
Annex C (Normative) Value of thermal transmittance at the edge line
Annex D (Informative) Test method for condensation resistance factor
Annex E (Informative) Test methods for thermal transmittance of glass
Annex F (Informative) Test methods for thermal transmittance of door and window frames
Test method for thermal insulating performance for building exterior doors and windows
1 Scope
This standard specifies the test principle, test device, test pieces and installation requirements, test and test report of the thermal insulating performance for building exterior doors and windows.
This standard is applicable to the thermal insulating performance test for vertical exterior doors and windows of buildings.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4132 Definitions of terms relating to thermal insulating materials
GB/T 5823 Terminology for building windows and doors
GB/T 10294 Thermal insulation - Determination of steady-state thermal resistance and related properties - Guarded hot plate apparatus
GB/T 13475 Thermal insulation - Determination of steady-state thermal transmission properties - Calibrated and guard hot box
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 4132 and GB/T 5823 and the following apply.
3.1
thermal insulating performance for building doors and windows
ability of building exterior doors and windows to prevent thermal transmission from indoor to outdoor, which is characterized by thermal transmittance
3.2
doors and windows thermal transmittance
thermal transmission capacity per unit area in unit time under the condition of steady-state thermal transmission when the air temperature difference between both sides of doors and windows is 1K
Note: It is revised from Definition 2.8.15 in GB/T 4132-2015.
3.3
thermal conductance
ratio of the thermal transmission capacity per unit area through the filler plate of certain thickness to the temperature difference between the two surfaces of the plate under the condition of steady-state thermal transmission
3.4
thermal current coefficient
thermal transmission capacity under the condition of steady-state thermal transmission when the temperature difference between the two surfaces of box wall or test piece frame in the hot box is 1K
4 Test principle
Based on the principle of steady-state thermal transmission, the thermal transmittance of building exterior doors and windows is tested by the calibrated hot box method. The hot box is on one side of the test piece, which simulates the indoor air temperature conditions of heated buildings in winter; the cold box is on the other side, which simulates outdoor air temperature and air flow rate in winter. Under the condition that the gaps of the test piece are sealed and both sides of the test piece are kept under stable air temperature, air flow rate and thermal radiation, measure the calorific value per unit time of the heating device in the hot box, subtract it by the heat loss passing through the hot box wall, the test piece frame, the filler plate and the edges of test piece and filler plate, and then divide the value by the product of the area of the test piece and the air temperature difference between both sides, so as to obtain the thermal transmittance K value of the test piece.
5 Test device
5.1 Composition of test device
The test device mainly consists of five parts: hot box, cold box, test piece frame, filler plate and environmental space, as shown in Figure 1.
Contents of GB/T 8484-2020
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Test principle
5 Test device
6 Test pieces and installation requirements
7 Test
8 Test report
Annex A (Normative) Calibration of thermal current coefficient
Annex B (Normative) Calculation of weighted average temperature
Annex C (Normative) Value of thermal transmittance at the edge line
Annex D (Informative) Test method for condensation resistance factor
Annex E (Informative) Test methods for thermal transmittance of glass
Annex F (Informative) Test methods for thermal transmittance of door and window frames
