Experimental And Simulation Study On Indoor Air Flow Pattern In The Air Supply Mode Of Nozzle And New Type Of Diffuser

With the rapid development of society and economy,the time that people stay in the architecture continues to increase,so the requirement of better indoor environment is increasing as well.The quality of indoor air has an important influence on the health and the work efficiency of people in the room.The reasonable indoor air flow pattern is meaningful to indoor environment and people's health for its function of improving air quality.Under the current crisis of energy shortage,the energy consumption of center air-conditioner keeps raising and the air pollution is worse and worse.The reasonable indoor air flow pattern is an environmentally friendly way to decrease the energy consumption of air-conditioner while maintaining the comfortable degree of indoor working reach.The experimental and simulation study on indoor air flow pattern in air supply mode of nozzle and a new type of diffuser is mainly studied under the summer circumstances in this paper.The mainly used comprehensive experimental platform of center air-conditioner and air dynamic performance is in a standard air flow test room.This room is in the municipal,heating,ventilating and air conditioning laboratory center of Chang'an University.The reasonable air flow pattern and thermal comfort is studied by the experimental study on indoor airflow and temperature fields in the air supply mode of nozzle under the condition of primary return air-conditioning systems and pure air-conditioning systems with the change of fan frequency.Compared with the influence of supply air rate and the type of air distribution,the results show that the air inlet parameter has a great impact on indoor airflow and temperature fields and the pressure of primary return air effects the air flow pattern near the outlets greatly.Compared with the influence of the new type of diffuser under the condition of the LED turning on and turning off,the results show that the air temperature indoors of simulated calculation with LED turning on is 0.01 K higher than the condition of turning off,and the difference of the air temperature is 0.1K in experiment.Thus,the influence of LED turning on or turning off to the air temperature is ignorable.The reasonable air flow pattern and thermal comfort is studied by the experimental study on indoor airflow and temperature fields in the air supply mode of the new type of diffuser with a center supply air rate.The structure of nozzle and the new type diffuser is established in Gambit software for simulated calculation in Fluent software according to the experimental data.Compared with the simplified structure of the two types inlets,the simulated calculation results of actual inlets structure are more similar to the experimental results in the air flow pattern of the air-conditioning systems and the influence of wall-attached-jet.The simulated calculation results actually show the air flow pattern indoors.According to the reasonable simulated calculation air flow pattern,several methods of improving air flow pattern are summarized in this paper.