Study On Indoor Thermal Environment Of Circular Membrane Structure Material Plant

Waste of coal resources and a series of environmental problems are more and more serious due to the coal open dumping,the existing improvement measures for the open coal field are also too flawed to meet the increasingly stringent environmental requirements,In this case there has been a steel structure for coal storage.Its advantages of small footprint,environmental protection,high utilization of space provide a good solution to the coal open piled up.However,for large space and large span of coal storage plant,the use of steel structure for coal storage will spend a lot and make the construction to be more difficult,so the membrane structure pile material plant came into being.The advantages of light and soft,as well as the convenient construction and low cost,have the advantage of being used to construct large span and columnless spaces.The membrane structure stacking plant has the advantages of fully enclosed coal field and overcomes the disadvantages of steel structure,it is an excellent choice for storing coal.But there have been new problems,for the translucent membrane structure of the plant,under the action of solar radiation,the indoor phenomenon will be overheated and when there is an internal heat source the indoor temperature will be higher,which will affect the work of the staff and the normal use of the instruments.The most commonly used method for improving the thermal environment in industrial plants is natural ventilation which is environmentally friendly and energy efficient.At present,there is little research on the indoor thermal environment of membrane structure and the influence of natural ventilation on the indoor thermal environmentof membrane structure.This paper will solve those problems.Due to the uncertainty of natural ventilation,this article only consider the natural ventilation under hot pressing.In order to study this subject,this paper takes a membrane structure pile plant in Wuhan as the research object,and simulates the indoor thermal environment under different conditions by CFD simulation method.The thermal properties of the membrane were analyzed theoretically before the simulation,and combining with the measurement of thermal characteristics for the membrane,the heat of the membrane structure in the summer was calculated.Then,the model was established,the model was divided and setting the parameters.In addition,the simulated calculation of the whole closed plant without heat source,the pressure ventilation without heat source heat,the first heap way different stacking temperature hot and ventilated,the second heap way hot pressing ventilation in the four conditions of the plant thermal environment,and the parameters such as indoor temperature field,velocity field,ventilation volume and temperature efficiency were analyzed.The results indicate that there is obvious temperature stratification in the membrane structure plant;In the summer,the indoor environment of the fully enclosed membrane structure will be overheated.So the hot air pressure is obvious and feasible.There are little impact on indoor temperature stratification height and temperature efficiency values as well as the plant exhaust air temperature and volumes of ventilation as the variety of heat source temperature,it will change the indoor air velocity and temperature values,but does not affect the distribution of the flow field and the variety of temperature field;Different stacking ways will affect the indoor temperature distribution and temperature stratification height,under the second heap way,the heat pressure ventilation will be better.This is of great significance to understand the indoor thermal environment of the membrane structure pile material plant and promoting the use of the membrane structure stacking plant.