Research On Improvement Of Thermal Environment In The Atrium Of A Commercial Complex Building In Summer In Chongqing

As a key component of commercial complex building,in the atrium design process needs to take into account the effect of the facade of the building and the need for indoor natural lighting,resulting in the atrium mostly using transparent structure,creating a good light environment at the same time causing a large amount of solar radiation into the interior,on the other hand,the cooling of personnel and equipment in the atrium chimney Under the influence of the effect,a large number of hot air gathered at the top of the atrium,affecting the temperature distribution of the personnel activity area around the top space of the atrium,making the thermal environment exceed the comfort standard,this paper will be based on this phenomenon,on the basis of the existing research,the atrium thermal environment and air conditioning system operation research,put forward the corresponding solution.In this study,a commercial complex in Chongqing was taken as the research object,first of all,the thermal ring status quo in the atrium is measured,through on-site testing and data finishing,writing program to calculate the environment PMV-PPD value,so as to grasp the thermal environment status quo of the commercial complex atrium;The cold volume expands the capacity,at the same time carries on the detailed diagnosis of the air conditioning system,including the energy analysis of the cold station,the performance of the air conditioning equipment,the water system,the valve parts,the end and so on,the comprehensive analysis causes of the overheating of the hot environment in the upper-level activity area of the atrium;The proactive modification route is achieved by reducing the air delivery temperature and increasing the wind speed.Using CFD software Airpak 3.0 to model the largest atrium No.5,the results of the simulation are summarized and the simulation results are compared with the measured data,and the accuracy of the simulation is verified.The effect of each element on the atrium thermal environment was evaluated according to the temperature,humidity,wind speed and PMV-PPD value of the personnel activity area.Sensitivity analysis was used to obtain the degree of importance of the impact of different retrofit measures on atrium thermal environment improvement.On the basis of the results of the analysis,a comprehensive renovation plan was determined,boundary conditions were re-entered for simulation,the results of the simulation were analysed and the comprehensive renovation measures were evaluated,and the optimal renovation plan was selected for the actual renovation of the atrium.The optimal air supply temperature is 17℃ and the optimal air supply speed is 2.5m/s.The addition of external shading and vents can reduce building energy consumption by 21.2% and 12%.Finally,based on the results of simulation and theoretical analysis,the actual reform of the thermal environment of the research object was carried out,and two sets of practical transformation plans for the air conditioning system and the thermal environment were formulated.After the thermal environment reconstruction,the overheating problem of the personnel activity area in the upper atrium of the commercial complex was solved,and the thermal environment evaluation indicators such as temperature,humidity,PMV-PPD,etc.all met the specifications;after the air conditioning system was reformed,the system’s operating output improved greatly After the hydraulic commissioning and optimization of the operation strategy,the air-conditioning system can save 1 million k Wh of energy a year,and the overall energy efficiency is increased by 17%.