Study On Ventilation Simulation And Dehumidification Of Underground Garage In Cold Area

In recent years,due to the poor ventilation and high water content of the underground garage,there is a common humidity problem,especially in rainy season.Therefore,it takes an underground garage in Tangshan City as the research object in the paper.And then it analyzes the water source of the underground garage,the wall heat and moisture coupling transmission mode and dehumidification method.In addition,it selects CFD software to simulate the temperature and humidity of the garage,and obtains the moisture-proof method suitable for the underground garage in cold areas.The main work is as follows:The model of underground garage is established by CFD software,and the heat and moisture balance equations of underground garage wall and indoor are calculated theoretically.Under the conditions of natural ventilation,mechanical ventilation and natural + mechanical ventilation,the anti condensation effect of garage under different temperature and relative humidity was analyzed by changing different wall,ground and insulation material schemes,changing different wall,ground thickness and insulation material thickness,changing different insulation material or air supply and exhaust mode.It is concluded that the wall is reinforced concrete,the thermal insulation material is polyurethane foam,and phenolic insulation material has good anti condensation effect.Finally,through regression analysis of the simulated data,the maximum critical ventilation relative humidity range of the underground garage under different ventilation temperatures is obtained.By calculating the indoor heat and humidity load of the underground garage as a civil air defense building,the thermal comfort simulation analysis is carried out.The indoor average temperature is 24.7 ℃,the relative humidity is less than 69%,the average wind speed is 0.18m/s,and PMV is obtained The results show that the proposed method meets the requirements of IAQI rating of 100 and good,which can provide reference parameters for practical engineering problems.Figure 49;Table 14;Reference 52...