Test Study On The Effect Of Atrium Skylight And Outer Shading On Atrium Temperature

The main functions of the large atrium space in public buildings are as follows: 1)utilizing the greenhouse effect of the atrium to increase indoor temperature in winter and reduce heating energy consumption;2)utilizing the chimney effect of the atrium to form good natural ventilation in the transitional season.However,in summer and transitional season,because of the influence of greenhouse effect,the temperature in atrium will be too high.To avoid this problem,measures such as opening skylight and shading are often adopted.On the basis of the existing theoretical research,this paper conducts an experimental study on the opening and shading of skylights.In this paper,high-rise buildings with large atriums in Beijing are selected as research objects.Temperature measurement points are set at different vertical heights of atriums,wind speed measurement points are set at roof skylights,and typical periods of summer and transition seasons are selected.Different combinations of opening and closing skylights,opening and closing sun shading and opening and closing air conditioning in atriums are separately selected.The temperature and wind speed of the skylight in the atrium were measured.By sorting out the test data of each working condition,the temperature parameter curves of each working condition varying with time are drawn,including indoor temperature curve,outdoor temperature curve,indoor and outdoor temperature difference curve,top and bottom temperature difference curve,etc.The changes of temperature in atrium under different working conditions are analyzed,and the temperature in atrium with skylight opening and closing and sun shading opening and closing are obtained.The degree of influence of degree.Then,by comparing the data and curves of skylight and shade,the importance of the two factors to the atrium temperature is analyzed.The results show that the temperature in atrium is proportional to the height of building.The temperature gradient below 2/3 height is smaller,and above 2/3 height is larger.The maximum temperature difference between top and bottom can reach 9 C.In the afternoon,the temperature in West atrium is 1.5 C higher than that in East atrium due to the influence of sunshine.The opening of the atrium skylight can effectively discharge the hot air in the atrium,which is conducive to the decrease of the temperature in the atrium.The difference between indoor and outdoor temperature in the atrium can be reduced to 0-6 degrees C,especially for the improvement of the ventilation effect of the West atrium.Opening the sunshade outside the skylight is more conducive to the cooling of the atrium,thereby improving the comfort around the atrium.Opening the sunshade outside the skylight can better control the indoor temperature of each floor of the building.When using the sunshade,the temperature difference between the bottom floor and the outside is about 2.5 ~5 C,and the temperature difference between the top floor is about 0 ~4 C.The indoor temperature improvement effect when using the sunshade is better than that when using the sunshade.When the building is running,the West atrium skylight should be kept open,and the East atrium should be open to shade from 9:00 to 11:00 a.m.The effect of opening both the West atrium skylight and the outer shade on lowering the temperature in the atrium is most obvious.