There is much room for improvement in energy efficiency. Building energy consumption in Sweden, Denmark, is about 11 watts / square meter, and is 31.7 watts / square meter in Beijing, 33.7 watts / square meter in Harbin. 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.
As for the thermal radiation of the sun ,according to the economic conditions, a set of sun shading devices can be set reasonably, from the simplest sun visor, to intelligent control, there are successful used cases for the complex facilities with immediate adjustment to the actual situation, we can also adopt heat-reflective coated glass and other materials ,and so as to reduce unwanted solar heat into the room in summer as much as possible ,and also contribute to the entry of sunlight in winter. Door and window setting should be conducive to natural ventilation and take heat away.
In the aspect of artificial light environment design, there are also many energy-saving means, the first is to determine the appropriate lighting standards and energy saving standards, China began to implement the latest “architectural lighting design standards “(GB50034-2004) on December 1, 2004. The standard not only regulates the lighting level for the various rooms and places, but also proposes lighting power density values corresponding to the illumination value(Lighting installation power on each unit area, including illuminants ,ballasts or transformers).In addition to residential, the relevant regulations for lighting power density value of public buildings are mandatory ,this will enable us at the design stage to control the amount of lighting energy consumption; Secondly, we should adopt high luminous efficiency illuminant and choose those lamps with high luminous efficiency, and reasonable light distribution; For large- area office, we should combine the lighting with air conditioning equipment, and then the heat generated by the lighting will be taken away directly, reducing air conditioning load is also an effective way to energy-saving ;we can adopt the automatic control means again, like light control, time control, infrared monitoring and so on. In the places and periods where Indoor natural lighting has met the illumination standards of artificial lighting, part of the artificial lighting should be shut down so as to avoid the unnecessary waste of energy caused by simple processing .At present, there are many excellent examples of energy-saving buildings at home and abroad. We believe that ,energy efficient buildings, due to their outstanding advantages, are bound to have broad prospects for development. And lighting as an important part of the building energy consumption, the energy-saving research should attract more of our attention and research inputs.
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