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	1. Hydrodynamic model for a hypolimnetic aerator
	SUN Xin,DUAN Feifei,LIU Wei,HUANG Tinglin,ZHANG Wushou,CONG Haibing
	Civil and Architectural Engineering 31 December 2013
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	Abstract:The water velocity in the aeration chamber of a hypolimnetic aerator directly influences the efficiency of mixing and oxygenation in the hypolimnion, and consequently the effect of water quality improvement. Based on the energy balance between the energy input and the energy loss for the gas-liquid two-phase flow in the aeration chamber, a one-dimensional hydrodynamic model for the aeration chamber was developed. Various types of energy loss were analyzed, an equation for the energy loss due to the wakes was particularly proposed. The average gas holdup and water velocity in the riser of the aeration chamber were predicted by solving the developed model with the reeal-domain method of MATLAB. Sensitivity analysis of the model parameters showed that the prediction results were greatly dependant on the flow resistance coefficient at the top and the coefficient due to local disturbances at the entrance and exit. Using optimized parameters, both gas holdup and water velocity were well predicted within ±7% and ±15% of the measured ones respectively. Developed hydrodynamic model for the aeration chamber can be used to accurately predict the average water velocities under different air flowrates in the aeration chamber, and can be used to design and optimize the hypolimnetic aerator.
	TO cite this article:SUN Xin,DUAN Feifei,LIU Wei, et al. Hydrodynamic model for a hypolimnetic aerator[OL].[31 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4579050


	2. The impact of using light-weight external thermal insulation materials on building surrounding thermal environment in summer
	LUO Guozhi,LI Nan,LI Baizhan
	Civil and Architectural Engineering 18 August 2011
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	Abstract:Introduce a method for calculating surface heat storage coefficient of wall, and make a calculation on outside surface heat storage coefficient of several common walls with light-weight external thermal insulation materials and the traditional solid clay brick wall. In order to study the impact of using light-weight external thermal insulation materials on the surface temperature of external wall, carry out a contrasting experiment between an external insulation room and an uninsulated room in August, 2010, in Chongqing, China. Calculated result shows that outside surface heat storage coefficient of the insulated wall is much less than that of the traditional wall, the outside surface heat storage capability of the insulated walls is poor, and the surface temperature has great fluctuation. Experimental result shows that, during sunny time, surface temperature of external walls of the insulated room is obviously higher than that of the uninsulated one. In different orientations, due to different amount of solar radiation and being irradiated in different time, the contrasting temperature difference (CTD) appears different varied regularity. In a word, using light-weight external thermal insulation materials is bad for building surrounding thermal environment and has a negative impact on people's health. Finally, some suggestions on how to eliminate the impact, such as improving the surface condition of the building envelop, plating vertical greening etc, are put forward.
	TO cite this article:LUO Guozhi,LI Nan,LI Baizhan. The impact of using light-weight external thermal insulation materials on building surrounding thermal environment in summer[OL].[18 August 2011] http://en.paper.edu.cn/en_releasepaper/content/4439020

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