Study on Natural Ventilation Characteristics of Integrated Optical Ventilation System for Underground Buildings Considering Thermal Effect
The integrated lighting and ventilation system combines natural lighting and natural ventilation,which can effectively reduce the lighting and ventilation energy consumption of underground buildings. In view of the fact that the thermal effect of light guide tube is usually ignored in previous optimal design,the integrated model of light guide lighting ventilation under the coupling of thermal effect and indoor heat source is established,and the characteristics of natural ventilation under its action are analyzed. The results show that the heat flux distribution caused by solar radiation on the tube wall is very uneven,and the heat flux distribution along the circumference is symmetrical up to 227W/m2. The thermal effect enhances the natural ventilation effect of the integrated system of lighting and ventilation. When the thermal effect is taken into account,the natural ventilation volume increases by up to 17.9％,and the average air velocity at the outlet of the channel increases by 56％. On this basis,the effect of solar radiation intensity on the natural ventilation performance of the system is studied. The results show that with the solar radiation intensity increasing from 200W/m2 to 1000W/m2,the thermal effect of the light pipe is enhanced,and the air flow in the channel increases from 187m3/h to 202m3/h.
Integrated system of light ventilationThermal effectNatural ventilation
万方数据
维普
