Reports from Baijia:
How much do you know about the six main performances of doors and windows? Below, Baoning door and window manufacturers will popularize them to everyone.
I. What is the k value of aluminum alloy doors and windows
Concept: K value is also called heat transfer coefficient, previously called overall coefficient of heat transfer. The current national standards and specifications are uniformly named as heat transfer coefficient. The heat transfer coefficient K value refers to the heat transferred through an area of 1 square meter within one hour when the temperature difference between the air on both sides of the enclosure structure is 1 degree (K,℃) under stable heat transfer conditions, unit: W/m2 (W/㎡ K).
Heat transfer coefficient K(W/m2K) of various door and window materials:
Ordinary aluminum alloy profile: 6.6
Insulated aluminum alloy profile: 4.0
Wooden window frame: 1.8
5mm white glass: 5.5
(5 + 12A +5)mm hollow white glass: 2.8
(5 + 9A +5) mm hollow white glass: 3.0
(5 + 6A +5)mm hollow white glass: 3.2
Simple calculation method of K value of doors and windows (air tightness is not considered)
In general doors and windows, the profile area accounts for about 25%, the glass area accounts for about 75%, and the heat transfer coefficient K value of various doors and windows is simply calculated as follows:
Ordinary aluminum alloy profile doors and windows: K = 6.6 × 25% +2.8 × 75% = 3.75
Insulated aluminum alloy profile doors and windows: K = 4.0 × 25% +2.8 × 75% = 3.10
Calculation method of heat loss of doors and windows:
Calculate the total heat loss of the window with the heat transfer coefficient K value of 3.5W/(m2K), heating outdoor temperature of 0℃, heating indoor design temperature of 20℃ (note: it does not include heat loss caused by air leakage):
3.5×(1.2×1.5)×20=126W/h
II. What is the wind pressure resistance of aluminum alloy doors and windows?
Concept: wind pressure resistance refers to the ability of closed external (door) windows to avoid damage and dysfunction under the action of wind pressure. This index is the most important of the three basic physical properties of doors and windows. The wind pressure resistance performance design of doors and windows shall be implemented according to the relevant requirements of GB 50009 "code for load of building structures.
III. What is the watertightness of aluminum alloy doors and windows
Concept: watertightness refers to the ability of closed outer (door) windows to prevent rainwater leakage under the simultaneous action of wind and rain. This indicator is one of the three basic physical properties of doors and windows.
4. What is the air tightness of aluminum alloy doors and windows?
Concept: density refers to the ability of the outer (door) window to prevent air penetration in the closed state. This indicator is one of the three basic physical properties of doors and windows.
V. What is the lighting of aluminum alloy doors and windows?
Concept: Lighting refers to the brightness of light and sunshine. Lighting coefficient: refers to the ratio of the opening area of the house window to the floor area of the house. In general building doors and windows, the profile area accounts for about 25% and the glass area accounts for about 75%.
VI. What is the sound insulation performance of aluminum alloy doors and windows
Concept: The sound insulation performance of doors and windows refers to the ability of doors and windows to weaken the sound transmission from the sound source to the listener.
From Baidu know reports:
1. Thermal insulation, that is, K value:
K value is also called heat transfer coefficient, which used to be overall coefficient of heat transfer. The current national standards and specifications are uniformly named as heat transfer coefficient. The heat transfer coefficient K value refers to the heat transferred through an area of 1 square meter within one hour when the temperature difference between the air on both sides of the enclosure structure is 1 degree (K,℃) under stable heat transfer conditions, unit: W/m2 • degree (W/㎡ • K). The lower the k value, the better the thermal insulation performance.
Ordinary aluminum alloy profile: 6.6
Insulation aluminum alloy profile: 4.0 wood window frame: 1.85mm white glass: 5.5
(5 + 12A +5)mm hollow white glass: 2.8 (5 + 9A +5)mm hollow white glass: 3.0
(5 + 6A +5)mm hollow white glass: 3.2
II. What is the wind pressure resistance of doors and windows?
Concept: wind pressure resistance refers to the ability of closed external (door) windows to avoid damage and dysfunction under the action of wind pressure. This index is the most important of the three basic physical properties of doors and windows.
3. What is the watertightness of doors and windows?
Watertightness refers to the ability of closed outer (door) windows to prevent rainwater leakage under the simultaneous action of wind and rain. This indicator is one of the three basic physical properties of doors and windows.
4. What is the air tightness of doors and windows?
Tightness refers to the ability of the outer (door) window to prevent air penetration in the closed state. This indicator is one of the three basic physical properties of doors and windows.
V. What is the lighting of doors and windows?
Lighting refers to the brightness of light and sunshine. Lighting coefficient: refers to the ratio of the opening area of the house window to the floor area of the house. In general building doors and windows, the profile area accounts for about 25% and the glass area accounts for about 75%.
6. What is the sound insulation performance of doors and windows?
The sound insulation performance of doors and windows refers to the ability of doors and windows to weaken the sound transmission from the sound source to the listener.
