2010, Volume 12, Issue 8
Strategic Study of CAE >> 2010, Volume 12, Issue 8
Geometry model for dynamic thermal process in building
1. Institute of Built Environment and Control, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China;
2. College of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China;
3. Architecture Design Institute, South China University of Technology, Guangzhou 510640, China;
4. College of Energy Science and Engineering, Central South University, Changsha 410075, China
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Abstract
The projection of sun direct radiation and the solar radiation intensity gained on wall vary with time; the variation can't be calculated directly in present algorithmic framework of dynamic thermal process in buildings. According to the feature of building thermal process model and the theory of computer graphics, a new geometrical model for analysis of building thermal process is advanced in the thesis. Building in the model is simplified into an aggregation of space regions, which are composed of vector planes. Core arithmetic method for the geometric model is presented, which is vector calculation for straight-lines and planes in three-dimensional space. The geometric model can help to realize the direct calculations of solar direct radiant heat exchanges between walls, and the projection of solar direct radiation; it also has practical value on air flow, mutually shading between buildings, light pollution problems and so on.
Keywords
thermal process in building ; geometrical model ; solar radiation
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