Numerical Simulation Of Air Distribution In A VAV Air Conditioned Conference Hall

With the increasing development of reform，people working environment hasimproved greatly and all kinds of office buildings arises at the historic moment,suchas conference hall. The hall belongs to personnel-intensive construction, the use ofrandomness is also a great time, if required at any time to meet the staffing needsinterior parameters, and its air-conditioning system operation it is important forregulating. An air conditioning system in good working strategy not only bringcomfortable indoor environment, but also save a lot of energy, energy saving tasks forthe country is also a strong support, so as a building energy-hungry air-conditioningsystem operating energy naturally being taken seriously together. For suchpersonnel-intensive hall building, because of its heat, moisture load large and highlyuneven, considering the energy saving and easy to adjust to the run, the best design ofthe entire air VAV system.The VAV air conditioning system can better adapt to theload change, at any time to change the system air volume reaches operating energy,but if the VAV air conditioning system airflow under partial load ineffective would bedifficult to achieve good indoor air quality, but also fail to save energy purpose. Basedon a hall, this VAV air-conditioning system as the research object, usingcomputational fluid dynamics software Fluent regard this air conditioning systemunder part load to simulate the airflow and identify part load optimized systemoperating parameters.Around this issue,this article expand the following work:First,the model is instroduced in this paper,and on the basis of reasonableassumptions for this model,the cold and heat load is determined.The air output underthe full load in winter and summer is delivery according to the effective temperaturedifference.According to the model size,confirm with double side back to thewind,which equipped with upper air supply,reture the underside reture.Through the airdistribution design calculated,determined to the size and air supply velocity,providetheoretical basis for the back of the simulation.Second,establish mathematical models of conference hall,compute grid generated3d model of the space,determine the boundary conditions at the same time.By setting the solver, get the full load condition in winter and summer air flow field simulationresults by calculate. Analysis of simulation results,the calculated can validate thetheoretical form of air supply system is reasonable.Third,carries on the simulation of partial load conditions,respectively by80%and60%of the air conditioning load simulation.Through simulation of two kinds ofVAV terminal device,various forms of terminal equipment have a different impact onthe indoor flow field.Because this model uses the bilareral air supply,the supply rangeis short,so only need to use the throttle type at the end of the air supply equipment canmeet the requirements of indoor air distribution,at the same time also save onair-conditioning system costs.Fourth,according to the model selects the throttle type of VAV terminaldevices,winter jet Angle under partial load condition the influence of the flow field forfurther simulation.In winter conditions respectively in100%,80%,60%loadrespectively choose down10°、20°、30°inclination of the simulation. Resultsshow that in100%,80%under load,air supply jet tip down20°can obtain better airdistribution effect,under60%load,the supply air jet tip down30°can obtain betterair distribution effect.More work will be as the medium of public building air conditioning system airdistribution design lay the foundation for further study,airflow organization form toprovide the reference for engineering design personnel,provide the basis for operationmanagement personnel for operation and management strategies.This topic researchwill promote the application of computational fluid dynamics software in engineeringdesign,the CFD software in large and medium-sized construction further applicationand development in the design of air conditioning system air distribution will play apositive role in promoting.