Simulation Calculation and Orthogonal Analysis of Air Supply Parameters of Air Curtain at the Entrance of Shopping Mall

Abstract

Thearticle established the physical model of the air curtain at the entrance of the shopping mall, by orthogonal test method it drew up the scheme about theparameters of air curtain(outlet airtemperature, outlet air velocity, outlet width) and calculated different schemes by air flow simulation. It got the value of A, B, C. A- the average PPD (PredictedPercentage of Dissatisfied) in the horizontal plane of height 1.6m, B- the average PPD in the horizontal plane of height 1.6m, air curtain length range and within 2 m from the door, and C- the distance from the door at the center line of the door and height 1.6m when PPD =10%. B was used as the experimental result and carried out orthogonal analysis. The conclusion was that supply air temperature got higher, the value A became smaller and the value B became larger, which indicated that the highoutlet airtemperature was conducive to improving the average comfort level of the whole room, but not conducive to improving the comfort level of the area near the door.The value C was basically the same when outlet airtemperature was 32, 36 and 40 ℃, which was less than the value C whenoutlet airtemperature was 28, 44 and 48 ℃, the influence on thermal comfort was small.The value B at the velocity of 5 m /swas obviously larger than that at the velocity of 6 and 7 m / s, and the value B at the velocity of 6 and 7 m / s has little change. When the outlet width increased, the value B increased. When the width was 10 and 15 mm, the value B changed little, but when the width was 20 mm, the value B increased obviously.When the outlet airtemperature is 32 ~ 40 ℃, outlet air velocityis 7m / s and outlet width is 10mm, thebetter thermal environmentevaluation can be obtained.