In recent years, the energy crisis, environmental protection and the improvement of living standards, have all called for building energy efficiency, which has already become the common choice in global architectural community after a thorough consideration. So, what on earth are the energy-efficient buildings, and what are the benefits, so that everyone is so concerned about them? What does light environment design used in building have in the energy saving aspect mean? This article will make some simple introductions over the above several problems.
After a long period of time, people’s understanding of the concept of energy-saving building varied from the initial to save energy blindly, to focus on reducing heat loss, and now people come to emphasize improving energy efficiency in building. That is to say, energy saving building does not mean sacrificing comfort; on the contrary, it requires achieving high comfort more easily in a realistic way. It is generally believed that energy saving building refers to those that they can reduce energy consumption to the required level by improving the insulation properties of building envelope, taking heating and air-conditioning system operating efficiency and natural energy as well as technology measures, under the condition of ensuring the building functions and meet the indoor physical environment quality requirement. Meanwhile, when the heating and air conditioning measures are not taken, indoor physical environment of the buildings must meet a certain standard. Obviously, the biggest benefit of energy-efficient buildings is to reduce building energy consumption, thereby reducing maintenance costs. According to the Nordic experience, the inputs of energy-saving building are 3% higher than the general building at the beginning, but the maintenance costs can be reduced 60%. Building energy consumption in this article specifically refers to the building energy consumption. In developed countries, building energy consumption generally accounts for 30%~40% of country energy consumption, while it accounts for 28% of total energy consumption inChina. For the moment,China’s energy situation is quite grim, but our architecture energy saving level is quite lower.
There is much room for improvement in energy efficiency. Building energy consumption inSweden,Denmark, is about 11 watts / square meter, and is 31.7 watts / square meter inBeijing, 33.7 watts / square meter inHarbin. If we can reach the above energy efficiency level of advanced countries, we will save 60 to 70% of building energy consumption. Secondly, building energy efficiency can improve the quality of the indoor environment and meet the needs of people’s rising living standards. In addition, building energy-saving can reduce air pollution caused by the building heating. If we adopt the new material of wall, the limited clay resources will be saved. Currently, the focus of the energy-saving building is the indoor thermal environment; in fact, in the light environment design used in building aspect, building energy efficiency is also promising. Firstly, in the natural lighting aspect, window area and orientation should be carefully considered, and import devices for natural light such as the sun reflection panel or light pipe can be set; the interior decoration can be light colored so that the secondary reflected light can be increased, by these means, adequate indoor lighting can ensured, and up to a certain uniformity, thereby reducing artificial lighting during the day, saving lighting energy consumption, as well as the increased air conditioning load caused by radiating heat of lighting equipments.