Does the south glass curtain wall building need refrigeration in winter?

Glass curtain wall is basically not used in southern China, mainly considering the following factors. The first layer of glass curtain wall has good permeability and visible light can be projected in. If it is high-permeability low-e glass, near infrared rays can also be projected in, which will be absorbed by objects with heat storage performance such as envelope structures and furniture. When the surface temperature rises above the air temperature, it will be transferred to the surrounding air through natural convection to become the instantaneous heat gain of the room, which will increase the cooling load of the room. Secondly, considering the thermal storage performance of glass curtain wall, the thermal storage performance of glass is very small, which will have two effects. First of all, it will quickly increase the indoor temperature in summer (glass also has a greenhouse effect), thus increasing the cooling load. Second, if it is in winter or in the north, it will help to increase the average indoor temperature. Reduce the heating load. Thirdly, due to the advantages of long summer and short winter in southern China, glass curtain wall can light and reduce lighting in winter, but from the point of energy consumption in one year, glass curtain wall is not suitable for southern China. So don't use glass curtain wall. The heat storage performance of the wall is mainly reflected in the high outdoor temperature during the day. The building heat accumulator can be used as a heat absorber to absorb the heat entering the room, thus reducing the indoor air temperature, improving the comfort performance and reducing the extra cooling demand. When the outdoor temperature is low at night, the heat stored in the external wall is slowly released, and the heat is discharged through natural ventilation and mechanical ventilation. In winter, the floor and external walls absorb the radiant heat of the sun during the day, store the heat, and slowly release it indoors at night to raise the air temperature. In winter, the stronger the thermal storage performance of the external wall, the better the effect will be, but in summer, it does not conform to this law. In winter, whether it is day or night, the direction of heat flow is from indoor to outdoor, while in summer, the direction of heat flow is from outdoor to indoor and from indoor to outdoor, and the direction of heat flow is just the opposite. If the heat storage performance of the external wall is great, a lot of heat will be stored during the day, which will reduce part of the cooling load. At night, due to the small outdoor daily temperature difference in southern areas, it is difficult to dissipate a large amount of stored heat quickly. On the one hand, it will increase the cooling load. On the other hand, due to the continuous high temperature for several days, the exterior wall will lose its heat storage performance due to the high temperature during the day, so try not to use materials with high heat storage performance in the southern region. External wall thermal resistance, the greater the external wall thermal resistance, the better its thermal insulation performance, which is proportional to the thermal conductivity, while the thermal storage performance is proportional to the product of thermal conductivity, density and specific heat capacity. For solid walls, the greater the thermal resistance, the better the thermal insulation performance and the better the thermal storage performance, so thick walls are generally not used in the south.

Roof, due to the low latitude in the south, in summer, the roof is in direct sunlight for a long time, which will make the roof temperature rise rapidly, reaching a high temperature of more than 60 degrees at noon, so the cooling load consumed by heat transfer from the house to the room accounts for a large part. Usually several roof treatment methods are 1. Choose a suitable thermal insulation material, and its thermal conductivity and thermal inertia index should meet the standard requirements. 2. Use overhead thermal insulation roof or inverted roof. 3. Green roofs, water storage roofs, light-colored roofs and sloping roofs are adopted. 4. Adopt ventilated roof and attic roof. Choose a suitable roof according to the actual situation.