Method for acquiring radiation heat transfer angle factor between building surfaces

Abstract

The invention discloses a simplified calculation method of radiation heat transfer angle factor between building surfaces. And a spherical trigonometry is adopted to quantifyspatial relationships between each wall surface, sky and ground in a building body enclosure space, and is used for radiation heat transfer calculation betweenbuilding wall surfaces. The invention relates to an enclosure spaceformed by a building body. Firstly, setting a unified coordinate system, and performing grid division on a wall surface; then, performing spherical surface geometric division on a projection range ofsurrounding wall surfaces on aspherical surface of a field of view; then, deducing a radiation angle factor calculation formula under a geometric space of four walls; calculating a radiation angle factor of agrid on a spherical intermediate projection, and then calculating the radiation angle factors of the grid on the sky and the ground; and finally, calculating the average radiation angle factors of whole surface on all the wall surfaces, the sky and the ground around. The method for acquiring radiation heat transfer angle factor between building surfaces is more suitable for calculating angle factor between building surfaces, and has the advantages of being simple and convenient, easy to operate, high in precision and fast in operation.

Description

technical field [0001] The invention belongs to the technical field of building thermal engineering, and in particular relates to a method for obtaining the radiation heat transfer angle coefficient between building surfaces, and is especially suitable for obtaining the radiation angle coefficient between surfaces in an outdoor building enclosure space. Background technique [0002] The rapid construction of the city has made the building density more and more dense, resulting in the emergence of a large number of dense building groups in the city, with small spacing and enclosed layout. The increase of enclosed space has become a remarkable feature of urban space development. The enclosure between buildings has an important impact on the outdoor thermal environment in terms of building sunlight, ventilation, and radiation heat transfer. Radiation heat transfer is the main heat transfer method between buildings and between buildings and the outdoor environment, and the radia...

AI Technical Summary

Problems solved by technology

Among them, although the geometric method or graph method can calculate the angle coefficient between the geometric planes with relatively regular relative positions, it cannot directly calculate the radiation angle coefficient between the sky and the ground after being blocked by the building, and the sky and the ground are not planes or planes in the traditional sense. Curved surfaces, the architectural space is more like surrounded by infinite sky and ground, the above calculation method of radiation angle coefficient needs to be calculated through multiple transformations

Therefore, when quantifying the relationship between the radiation angle coefficients of each surface in the building enclosure space, the above method is not easy to operate, and the calculation is relatively complicated

Images