Construction of external thermal insulation system should be adapted to local conditions - Database & Sql Blog Articles

Huaqiang Square Crystal Zhen full range of original stock

China has a wide geographical area and a large regional climate. Apart from the difference between the north and the south, there is also a climate zone, which is the hot summer and cold winter zone. For example, like Hangzhou, this city is the highest temperature in the summer and the winter temperature in the same latitude. The lowest area. The climate difference makes the requirements for building energy conservation different. The northern area is mainly based on heat preservation, while the southern area is mainly based on heat insulation, while the hot summer and cold winter areas are both considered. Considering winter insulation, it is necessary to consider summer isolation. Heat, this poses a challenge to the ways and methods of building energy efficiency.

Why should we propose that building energy conservation must be tailored to local conditions? Because our entire building energy-saving technology from Europe and the United States to the north of China, and almost to the southern region, we can say that we are engaged in building energy-saving work from scratch, and encountered too many problems in the process. In order to improve the energy efficiency of buildings, the biggest problem is also the core part of the energy-saving system that builds the entire wall.

Regarding the research on energy-saving technologies in the hot summer and warm winter regions, we began to imitate, digest, constantly improve ourselves and strive to innovate from a decade ago, but now we have once again encountered bottlenecks. One of the most important reasons for this is because we have too little research on core technologies. For the hot summer and warm winter areas, it is not possible to rely solely on thermal insulation or thermal insulation technology to achieve building energy efficiency.

The energy consumption pattern in the northern region is relatively simple. All indoor spaces in the building are isothermal, and only need to consider the heat loss to the outdoor, but the situation in the hot summer and cold winter is the intermittent energy use mode and the energy characteristics of the local space. And mainly air conditioners. For a building, from an intermittent point of view, the average daily air conditioning time will not exceed 12 hours, usually 8 hours, then the basic situation will result in different energy consumption modes than other regions; In addition, the use of local space makes our whole building not an isothermal body, especially residential buildings, at most 1/2 of the space is in use, and this energy consumption mode will not change for a long time.

Our current design standard, “standard working condition”, is based on the entire building's full space and full-time energy-saving calculation. The hot summer and cold winter areas meet the energy-saving requirements according to design standards, but in fact, because of their regional and The characteristics of the design, the theoretical calculation of the "standard working conditions" and the energy consumption mode under the "real working conditions" are different.

Therefore, the energy use mode in the hot summer and cold winter regions and the existing "standard working conditions" form also pose challenges for the external thermal insulation system. How to effectively increase the incremental cost of building energy savings in all parts of the building. How to balance the internal and external protection structure and the performance of the doors and windows, can it be raised and lowered? These are all questions that we need to think about. I believe that in the hot summer and cold winter regions, we can effectively allocate the energy-saving resources originally used for the external walls to the inner and outer protective structures, and achieve flexibility through the unit coefficient, column-wall ratio, window-to-wall ratio, etc. Design, truly achieve the goal of saving energy and saving.

In addition, the actual situation also tells us that in the development of building energy-saving and external thermal insulation structural systems, it is necessary to comprehensively consider materials, design and construction to achieve synergy; at the same time, we cannot only talk about the actual work. Theoretical energy saving, it is necessary to adapt to local conditions, combine energy conservation with economy, and achieve real building energy efficiency.