Numerical Simulation And Energy-saving Efficiency Analysis Of Ventilation Method In An Underground Garage

With the rapid development of China’s economy, people’s living standards continuously improve, the car has become the mainstream of transport. In land resources increasingly tense cities, parking problems have become increasingly prominent, underground garage due to not take up space on the ground, so people favor the underground garage.The underground garage in comparison with the ground garage has its special structure makes the car difficult to discharge the harmful substances, the poor ventilation ability, so people is particularly worried about the air quality of the underground garage. In order to ensure the good air quality of underground garage as much as possible to save energy, you need to determine the reasonable type of ventilation and the control methed of ventilation systems.In this paper, according to the structure characteristics of cold climate area Shenyang underground garage, puts forward a kind of natural ventilation, mechanical ventilation is complementary binary underground garage ventilation system.This paper studies the main contents are:(1) The use of numerical simulation software FLUENT, respectively, for winter and summer conditions of the underground garage to simulate natural ventilation system, derived velocity field, temperature field and the distribution of CO concentration field, and then analyzed in detail and contrast.(2) For the transition season natural, ventilation conditions can not meet the needs of the concentration, air supply system of the original mechanical is simulated and analyzed, two different improvement program based on this(option one, adjust the air supply outlet, air vents position, Option two is the use of mechanical ventilation + natural complement wind), and numerical simulation results are compared and analyzed, concluded that mechanical exhaust ventilation system plus natural complement wind has optimal airflow and energy savings.(3) Based on these studies, energy consumption of ventilation system in an underground car park was analysed and calculated,the results show that ventilation load is the main equipment expenditure, namely rational calculation method of ventilation and appropriate control plays a key role in reducing energy consumption, this paper analyzes the economy and energy characteristics of the different ventilation scheme, to provide effective reference for program design and control strategy optimization for cold region of underground garage ventilation system.