What is a cold bridge in construction engineering and what are the general parts

Cold bridge, thermal bridge is a different name for the same thing phenomenon in the north and south: it mainly refers to the heat transfer coefficient of some parts of the envelope structure due to the heat conduction between the building envelope and the outside world.

It is significantly larger than other parts, so that the heat is transferred quickly from these parts in a concentrated manner, thereby increasing the air conditioning, heating load and energy consumption of the building, which is now generally referred to as thermal bridge. This is the generally accepted definition in the North and the South, although for reasons of custom, the North region.

It's still called Cold Bridge.

such as metal, concrete or reinforced concrete built inside a brick wall or aerated concrete wall.

Beams, columns, plates and ribs, ribs in prefabricated insulation, metal joints set up for the inner and outer walls of the tie in the sandwich insulation wall, metal anchors added to the fixed insulation board in the external insulation wall, keels set up in the inner insulation layer, the connection between the balcony board and the main structure, the door and window frames in the insulation doors and windows, especially the metal door and window frames, etc.

The concept of a cold bridge:

Due to the difference in the local structure of the thermal insulation structure of the cold storage, the thermal insulation performance of this part is reduced, and it becomes a channel for a large amount of cold energy to be transmitted, which is called a "cold bridge".

Cold bridge, thermal bridge is the name of the same thing phenomenon in the north and south: it mainly refers to the heat transmission between the outer envelope structure of the building and the outside world, because the heat transfer coefficient of some parts of the envelope structure is significantly greater than that of other parts, so that the heat is transferred quickly from these parts in a concentrated manner, thereby increasing the air conditioning, heating load and energy consumption of the building.

Cold bridge, hot bridge is a different name for the phenomenon of the same thing in the north and south: it mainly refers to the outer barrier of the building.

When the heat capacity is conducted between the structure and the outside world, the heat transfer coefficient of some parts in the envelope structure is obviously greater than that of other parts, so that the heat is transferred quickly from these parts in a concentrated manner, thereby increasing the air conditioning, heating load and energy consumption of the building, which is now generally referred to as a thermal bridge. This is a generally accepted definition in the North and the South, although for reasons of custom, the northern region is still called Lengqiao.

For example, the metal built in the brick wall or aerated concrete wall, the beams, columns, slabs and ribs of concrete or reinforced concrete, the ribs in the prefabricated thermal insulation, the metal joints set up for the inner and outer walls of the tie in the sandwich insulation wall, the metal anchors added to the fixed insulation board in the external insulation wall, the keel set in the inner insulation layer, the connection between the balcony board and the main structure, the door and window frames in the thermal insulation doors and windows, especially the metal door and window frames, etc.

To put it simply, it is possible to form a good thermal conductivity.

The cold bridge mainly refers to the heat conduction between the outer envelope structure of the building and the outside world, because the heat transfer coefficient of some parts of the envelope is significantly greater than that of other parts, so that the heat is transferred quickly from these parts in a concentrated manner, thereby increasing the air conditioning, heating load and energy consumption of the building. The cold bridge has a destructive effect on the building, it will cause the cooling consumption of the room to increase, and waste the energy for cooling; There will be condensate on the high temperature side, which will affect the thermal insulation performance of the insulation material; It will also affect the use of the room on the high temperature side. To avoid these situations, it is necessary to minimize the number and area of cold bridges, and wrap the unavoidable cold bridges with insulation materials.

Cold bridges, i.e. bridges that transfer heat. There is also a term called thermal bridge, which is actually the same as the two. See Nanshe Encyclopedia

Specifically, hot and cold air will condense at the interface where they collide with each other, which is called "sha"."Cold bridges", is a relatively common phenomenon. Specifically, in the construction project, it is mostly the corner of the exterior wall of the house, the corner of the interior and exterior wall, the area range of the overlap angle between the roof and the exterior wall or the window range, and when the indoor temperature is higher than the outdoor temperature, the phenomenon of water mist adsorbed on the wall or window surface appears mostly in winter. The North is"Cold bridges"In areas where the phenomenon is frequent, because the weather in the north is relatively cold in winter, the temperature difference between indoor and outdoor is large, and the cold air enters the house and combines with the hot air to form a water mist adsorbed on the wall, and the house will be damp and mildew.

Reinforced concrete structure of the house"Cold bridges"The phenomenon mostly occurs in columns and beams; However, brick-concrete houses mostly occur at the whole beam, and then there are phenomena such as water seepage, wall skin peeling, and mold.

In this regard, there are also a lot of design treatments, including wall insulation treatment and window "broken bridge" structure treatment, the so-called broken bridge is based on the old ordinary window to improve the thermal insulation performance of the improved type, broken its biggest feature is "blocking the cold bridge". Specifically, rubber, nylon strips and other measures are used to block the cold bridge to avoid the above phenomenon, and this design is called "broken bridge" design.

The corresponding statement that there is a thermal bridging phenomenon is the same truth.

Cold bridge, thermal bridge is the name of the same thing phenomenon in the north and south: it mainly refers to the heat conduction between the outer envelope structure of the building and the outside world, because the heat transfer coefficient of some parts of the envelope is significantly greater than that of other parts, so that the heat is transmitted quickly from these parts, thereby increasing the air conditioning, heating load and energy consumption of the building, and the common is the condensation and frost phenomenon in the winter of the reinforced concrete lintel ring beam (rectangular section, not insulated). People call it a cold bridge or a hot bridge (generally called a cold bridge in the north).

Cold and hot bridge treatment method: Strengthening thermal insulation is an effective way to deal with thermal bridge. The temperature of the inner surface of the external wall can be increased by using the internal insulation of the external wall, but the thermal bridge at the junction of the external wall and the partition wall, the external wall and the floor slab is more obvious.

The better the internal insulation, the greater the proportion of heat lost through the thermal bridge. The use of external thermal insulation is conducive to avoiding the generation of thermal bridges because the insulation layer covers the entire exterior wall, but the side walls around the doors and windows should also be properly insulated to avoid excessive heat loss here. As for the thermal bridging problem of aluminum window frames, it can be solved by setting heat insulation strips in the window frames.

To put it simply, it is the place where the air is permeable (gas) and the defect of thermal insulation.