The Simulation Analysis And Comparison Of Displacement Ventilation And Hybrid Ventilation In The Hospital Wards

As living standards improve, people's health conditions and indoor comfort requirements are increasingly high, But the hospital is a special and complex environment, there are a large number of easy feelings crowd gathered here .Since "the SARS", the country has paid even more attention to the hospital wards air environment. At present in the world the personnel exchanges increasingly complex, new and old infectious diseases have emerged and effective control of the hospital air-hospital cross-infection has become the focus of ventilation design. The"Displacement Ventilation"took one new well ventilated way, it is very suitable in the environment which is in air pollution and has little oxygen, it can provide the better air quality. At present, China's hospital wards main using Hybrid Ventilation, but there are many defects in these ways of ventilation. New wind mixed with indoor polluted air, the pollutants are filled with the room, although concentrations are diluted, it is easily to create cross-infection. Since the emergence of the Displacement Ventilation, its superiority demonstrated gradually. Many experts and scholars also have done a lot of experiments to study, and in many buildings it has been applied very well.This article used commercial software Airpak to simulate the hospital ward temperature field, the velocity field, the carbon dioxide mass and PMV and the PPD distribution under the condition of the Displacement Ventilation and Hybrid Ventilation. In the room the cold load computation is according to the biggest time's cold load in one day. In the simulation process I discovered, in delivering in the same amount of wind, the velocity field and the temperature field of Displacement Ventilation are suits the special situation of the hospital, the Displacement Ventilation system can prevent the overlapping infection, although the comfort of the delivers gusty area in Displacement Ventilation system is not very good, but so long as change the position of delivers gusty area, it causes the patient far away to the window, so it can maintain active area's comfort to satisfy patient's request.In wards these special places Displacement ventilation system was fully play...