| With the development of economy and technology,the thermal comfort requirements of the working and living environment are increasing as one of the important studies in the field of traditional architecture, indoor thermal comfort are going toward the development of a broader direction.Usually research and evaluation of indoor thermal comfort are based on steady-state conditions, where the main three factors that affect the thermal environment:temperature, humidity, wind speed reaches a steady state does not change over time.In the current research, to achieve and maintain the so-called "the thermal neutral" state is not conducive to human health. Natural wind environment contains the changing wind direction, wind speed and turbulence frequency, can make human thermal comfort in a volatile state, it embodies the essence of "thermal comfort".How to role the natural wind research of the mechanism as well as the form of air supply in the air conditioning products, become a research direction of human thermal comfort under dynamic conditions. Artificially created environment not only need to meet the needs of general comfort,economic blast of energy saving and environmental protection equipment is also gradually be taken seriously.Evaporative cooling air conditioning technology is an economical and energy-efficient cooling,the research in relationship between air supply and exhaust volume of evaporative cooling fan can make the guidance for manufacturers products and the use to meet the comfort requirements.This paper use Airpak to build models to simulate natural wind supply in a low-frequency wind speed (0.3Hz,0.4Hz,0.5Hz), combined with a different form of indoor airflow distribution (up-inlet and down-outlet, down-inlet and up-outlet,up-inlet and up-outlet on the same side, up-inlet and up-outlet on the opposite side), to analyze the impact of indoor thermal environmental fluctuations on human thermal comfort by a blast fluctuation cycle5s of study time.The research has shown that up-inlet and down-outlet,up-inlet and up-outlet on the same side, up-inlet and up-outlet on the opposite side under the0.3Hz low frequency supply and down-inlet and up-outlet under0.5Hz low frequency supply can create better effect on human thermal comfort.In the evaluation of the thermal comfort of the dynamic air supply, as man can directly feel the wind fluctuations in indoor natural ventilation environment, due to different inlet positions,it can not guarantee the fluctuations in airflow sent direct role in the air-conditioned area,and can not be considered the only change of wind speed, temperature, humidity remains unchanged in air supply cycle,so the use of the the PD index evaluation is not accurate,need to use the standard deviation of the PMV instead.In order to reduce the low-frequency air supply led to the loss of indoor airflow fluctuations affect the effect of fluctuations in the indoor thermal comfort,as far as possible fluctuations in airflow are sent directly to the air-conditioned areas and returns are provided on the opposite side to keep the airflow smooth.Through measuring and analyzing the air supply and exhaust volume that impacts the indoor thermal comfort,air supply volume has a better effect that exhaust volume. A case at dry area is selected to calculate, the use of evaporative cooling fan can fully meet the thermal comfort of the indoor environment but require a large amount of wind, and current air volume can not meet in the office.Medium and high humidity areas can use evaporative cooling fan for cooling only partial, due to considerations of indoor air humidity, despite the installation of exhaust fans, it can not meet the thermal comfort needs of the whole room. |
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