新型遮阳网对帐篷热环境改善的试验及模拟研究

Influence of new shading net on thermal environment in tent by field measurements and numerical simulations

针对夏季帐篷过热问题,提出一种新型外遮阳网改善帐篷内热环境。通过理论设计得到不同纬度遮阳网的设计参数,对比新型外遮阳与六针外遮阳对太阳总辐射和直接辐射的透过率以及帐篷外壁面温度的变化。研究表明,新型外遮阳相比无遮阳和传统的六针遮阳网可以大幅降低帐篷的太阳直射辐射得热和外壁面温度,从而有效改善帐篷内部热环境。在此基础上使用Fluent软件对不同遮阳工况下帐篷内的温度场和速度场进行模拟,得出新型外遮阳能有效降低帐篷内的平均辐射温度和PMV。

A new external sunshade net was proposed to improve the thermal environment inside tents.It carried out a parametric study to determine the size of the new shading net at different latitudes based on theoretical analysis,investigated the difference between this new external shading and six-pin external shading by filed measurements,mainly related to transmittance of the total and direct solar radiation and the influence on the outer wall of the tent.The measured results show that the new external shading net can significantly reduce the solar direct radiation heat gain and the external wall temperature of tents,and improve the indoor thermal environment,compared with the non-shading net and the traditional six-pin shading net.Using Fluent software,we calculated the temperature field and velocity field inside tents under different shading conditions,and simulated results indicate that the new external shading can effectively reduce the average radiation temperature and PMV value in tents.