| In recent years, the traditional ventilation method was applied in many countries, but it causes a very serious problem-energy consumption. In order to decrease the building related energy consumption, the countries and regions of southeast Asia set higher indoor temperature standard in summer. How to increase indoor air quality and decrease building energy consumption is a very challenging subject. Stratum ventilation is proposed by Linzhang based on this background. As a new high-temperature air-conditioning mode, stratum ventilation provides high quality air for occupants and will not sacrifice thermal comfort with low energy consumption.To have profound understand the influence of different conditions of office environment under stratum ventilation in Lanzhou. In this dissertation, the physical and mathematical models for an office with stratum ventilation system in Lanzhou is established. Distribution of velocity, temperature, mean age of air and CO2concentration, the ventilation efficiency and thermal comfort an studied numerically with a validated RNG k-ε turbulence model combined with FLEUENT6.3.The numerical results in the present study show that the newly proposed stratum ventilation does not only cause few feeling of head hot or foot cool, but also have few blowing feeling. Otherwise, the simulation results show that air changes, Ar and the height of air inlet have a obvious influence of indoor air quality. |
