The hottest German expert introduces how to promot

2022-07-31
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German experts introduced how to promote the application of building energy-saving glass

Germany is a country with high utilization rate of building energy-saving glass, and homhurst is a well-known building energy-saving glass expert in Germany. Recently, some media talked with homhurst about how to promote the application of building energy-saving glass, and asked him to introduce the concept and experience of Germany and European countries in the application of building energy-saving glass. The following is the dialogue between the author and Dr. homhurst

1. Generally speaking, what role does the appearance of houses play in the buildings of various countries

the enclosure structure around the building and its shape are important cultural and material assets. Wherever we go, we can enjoy the cultural landscape composed of various styles of buildings. In the interaction between building components and building materials, windows and glass curtain walls play a major role, because they connect the external wall and internal structure of the building, and occupy a large area in the overall building. In addition, they also have various functions and are one of the key factors affecting the user's living environment

at present, many buildings use a large number of windows and curtain walls and put forward more and higher requirements for multi-function, such as the shortage of air and water, the use of heat and solar energy with the change of pulse number and frequency, sound insulation, anti-theft and fire prevention functions, which also makes the planning of building structure and function design more and more detailed. At present, people have more and more strict requirements for functionality, high quality and cost control, and long-term customer satisfaction has become more and more important. This is especially true for civil buildings. General residential buildings lack good planning, because most of the houses are only constructed by engineering builders without planning by architects or professional engineering firms. Reviewing the development history of the house, the building enclosure structure was mainly used to shelter the wind and rain and prevent theft. Nowadays, the various characteristics of glass enable it to meet more and more residential requirements, such as indoor cooling, winter heat insulation, resistance to sunlight, shading, daylighting, health protection, etc

2. How to view the future development of China's glass curtain wall

as an expert in global glass curtain wall research, I think the average quality of existing glass in China is not satisfactory. Many new technologies that have been widely adopted in the world have not been used in China. The main reason is that the investor is unwilling to invest in building buildings with better performance and longer service life. However, if the Buyer/user does not have the awareness to purchase such houses, the investor will not consider increasing investment for this purpose. Therefore, the urgent task is to let everyone understand the advantages and disadvantages of transparent buildings and promote their demand for high-quality glass curtain wall buildings

3. What is the current coverage rate of Low-E coated glass in China? What is the gap with European countries (such as Germany)

the coverage of low radiation glass in European countries is also inconsistent. The countries with the highest utilization rate are Scandinavian countries, Germany, Switzerland and Austria. Energy saving glass has a very high coverage in these countries, which is mainly achieved through legislative means. In 70%~80% of German buildings, the coverage of low radiation insulating glass has reached 95%. Although people all over the world claim to use energy-saving glass, the actual situation is not optimistic. For example, to date, the coverage of energy-saving glass in North America is about 50%

speaking of China, I'm sorry. According to our understanding, the coverage rate of low radiation energy-saving glass is even less than 2%, which is very small. In previous years, coated glass was rarely used, and the sealing technology was not qualified, which made the quality of some Low-E insulating glass currently used poor. What is more incomprehensible is that it is almost difficult to find hollow glass buildings with thermal insulation membrane in hot and humid areas

4. What are the benefits of using low radiation glass for users

energy saving glass is of great significance to users and the environment. In Germany, we use four different levels of regulations to control energy consumption in cold areas. After the fourth step is achieved, we can limit the energy loss to less than 20% of the energy consumption of old buildings. Even for those old buildings, compared with the houses built in China in recent years, they are like comparing ordinary insulating glass with insulating glass with LOW-E membrane, inflatable, high-quality frame and sealed with warm edge technology. In addition, in areas with warm climate, if a good insulating glass system is to have the function of heat insulation and light blocking, it must combine other relevant technologies, such as shading, daylighting and anti glare technologies. The most important thing is natural ventilation, and even PV technology is used for solar cooling. Of course, this requires a good planning system. Glass plays an important role in this respect. Of course, glass technology alone is not enough to achieve all functions

5. What are the benefits of using low radiation glass for real estate developers and builders

of course, there are benefits, but it can not be seen at the beginning. Why should developers spend more money on goods that they could have sold at a low price before the national awareness of energy conservation was established? But if they do their part to promote this awareness, it is certain that they will build higher quality houses. A better corporate image will make their sales performance one step ahead. At least their house can be sold at a higher price. When the market operates well, the sale of higher value-added goods may not necessarily attract people's attention, and it is not important. However, when the market is in a downward trend, this is the key to obtain better sales and ensure that the enterprise can tide over the difficulties. Professional builders should be aware of this and make adjustments in the market. Of course, only a few enterprises will do so on a completely voluntary basis. Therefore, I firmly believe that the government should and must quickly formulate relevant laws and regulations to set up several levels, and gradually improve the implementation level in the future

6. At present, what problems exist in the energy consumption of glass buildings in China

as far as construction engineering is concerned, China is obviously the largest construction country in the world, and its total amount and usage per square meter are among the best. This makes us see a very optimistic prospect, that is, the best performance of the existing double glazing technology can reduce the energy loss by 85%, or at least achieve 50% in the leading stage. The glass of transparent buildings is the main source of house energy loss. Typical European houses account for at least 25% of the energy loss caused by glass and more serious if these dust enter the hydraulic system. In other words, 20% of China's building energy loss is basically caused by transparent materials and inefficient glass assembly technology. If this is converted into coal or oil consumption, the figure must be surprisingly high. Some people may think that only a cold climate can lead to such a large amount of energy consumption. In fact, due to the low energy utilization rate of the air conditioning system, the situation of the heating system is even worse. In warm climate, high-quality double glazing technology can effectively maintain energy consumption at an average level

7. Which situation do you think is the most serious

China has the same energy consumption problem as other countries, and is also facing a long-term learning process. But the difference is that if someone washes clothes in the river water, China's construction projects are developing in a long-term and rapid manner. The new buildings with low energy efficiency will exist for a long time and continue to consume a lot of energy. Eventually, these glass curtain walls will have to be rebuilt because they can not afford the high energy cost. These houses will soon depreciate and will be difficult to resell in the future. This is worthy of consideration by real estate developers or owners

8. Have European countries encountered the problems that China is facing today? How did they solve these problems at that time? What can China learn from

in Europe, people have established a consensus on the overall interests. Therefore, before the introduction of government regulations, some spontaneous mechanisms and systems have begun to operate. The relevant policies of the government provide relevant standards and restrictions, and further promote people to pay attention to the overall interests, so that more mechanisms spontaneously established by people can operate better. Industry associations and other organizations are responsible for establishing a rating system to distinguish the advantages and disadvantages of products for people to make their own judgments. Nowadays, even if the price is cheap, few people will buy products with poor performance. Therefore, the European Commission and the Ministry of construction of China have begun to discuss some new solutions to fund the "trainthetrainer" project, so as to promote the energy-saving awareness of important decision makers and authoritative experts and make them have a more positive impact on the quality of relevant products. This project will start with laboratories and certification centers closely related to new technologies. At the same time, we will also strive to publicize more, because this is a very important task

in addition, equipment suppliers who can provide advanced technology will also participate in it, because the quality of glass processing is closely related to the equipment used. If the equipment performance is low, the processed architectural glass will inevitably affect the overall performance of the house. This is exactly what China needs to learn. Avoid long-term neglect of energy conservation issues, and further promote the construction of relevant laws and regulations. The huge construction demand does not allow more delay. Do not miss the great opportunity to implement quality control immediately, so as to avoid causing more irreparable losses

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