The "2010 World Expo Construction and Building Materials, Energy-saving and Low-Carbon Concepts and Practices" International Forum was held in Shanghai a few days ago. More than 150 experts, scholars, entrepreneurs, government officials and association developers gave wonderful speeches and interactive exchanges, vividly demonstrating the powerful vitality of new energy-saving technologies and new chemical materials in building energy-saving new industries and future urban development. The magnifying effect of the Green Expo and Low-Carbon Expo is emerging.
The Shanghai World Expo can be described as the World Construction Expo. More than 230 pavilions have become a great practice and the highest-level display platform for new concepts, new materials, new technologies and new designs of energy-saving buildings.
All World Expos in history reflect the characteristics of the times. Tang Shifang, deputy director of the Technology Office of the Shanghai World Expo Bureau, introduced that in the exhibition and application of technology at this Shanghai World Expo, the obvious feature of the times is the innovative application of energy-saving, ecological and environmental protection technologies. The first is the use of solar energy. There is solar photovoltaic power generation. The entire park has 4.6 MW installations, solar collectors and solar thermal power generation. The second is that all buildings use thermal insulation materials, and many also use ecological technology. Four venues including the World Expo Center have been rated as three-star green buildings. The third is the demonstration of new energy vehicles. There are 1,000 new energy vehicles in operation in the park. The fourth is the use of river water source and ground source heat pump technology, and the utilization scale is unprecedented. The air conditioning and refrigeration of about 600,000 square meters of buildings are provided by river water source and ground source heat pump. Fifth, the innovative application of new chemical materials provides architects with new ideas; the outer wall of the German Pavilion is covered with an innovative polymer material Mesh, and the Italian Pavilion uses transparent concrete.
Tang Shifang said that green buildings and ecological buildings will have a large-scale development trend. The United Kingdom has legislated that all buildings must be green buildings after 2016. The United States also has regulations in this regard. The Chinese government is currently vigorously promoting that all buildings must meet the requirements. Energy saving goals. The wider application of energy-saving, ecological and environmental protection technologies will become a new opportunity for the development of building chemical materials in the post-Expo period.
However, the task of promoting energy-saving buildings is arduous. The current bottleneck is firstly the issue of industrial policy and the second is the issue of technical regulations. It is reported that the Chinese government has accelerated the pace of building energy conservation. According to Lu Shanhou, an expert from the New Wall and Building Energy-saving Materials Branch of the Shanghai Building Materials Industry Association, the state has recently issued two drafts of energy-saving design standards. The adjustment, especially the mandatory requirements for the energy-saving of doors and windows; the second is to propose the design standards for the renovation of existing residential buildings, and the energy-saving renovation of residential buildings will be implemented step by step. The "Regulations of Shanghai Municipality on the Administration of Building Energy Conservation" will soon be promulgated. According to reports, only 20% of the existing buildings of 860 million square meters in Shanghai belong to energy-saving buildings.
Experts at the forum suggested that there are three contradictions in building energy efficiency that need to be resolved. The first is the contradiction between commonly used building energy-saving materials and different periods of the building life cycle. The commonly used organic and inorganic thermal insulation materials have a life cycle of 25 to 30 years, but the reasonable service life of the building body is 70 to 100 years. Second, the contradiction between existing energy-saving materials and fire protection requirements. my country stipulates that Class A non-combustible materials must be used for exterior walls of public buildings over 50 meters high. However, there are very few of the most commonly used energy-saving materials that can meet Class A standards. Third, vigorously promote the contradiction between building energy conservation and urban safety. Some insulation materials with relatively low strength and density are pasted with rigid facing bricks. How long the firmness can be guaranteed is still unknown. After a few years, the facing bricks of high-rise buildings will cause hidden dangers to urban safety. In this regard, experts suggest that the chemical building materials industry and the architectural design industry should work together to overcome the problem.
