车厢热舒适性主要受车厢内部温度的影响。本文旨在研究在汽车冷却模式启动时，私家车车厢通风口方向对温度分布的影响。相比之下，当前的座舱温度取决于座舱的大小、通风口的数量和形状、整个HVAC系统的总流量以及仪表板、饰件和座椅的内部材料。在这项数值研究中，严格分析了太阳辐射对汽车座舱热舒适性的影响。通常情况下，轿厢内的通风口可手动调节，以控制气流方向。 计算流体动力学（CFD）研究是通过使用FLUENT 18.0作为求解器和ANSYS Inc.开发的CFD处理器进行的，其中嵌入了太阳能负荷模型。使用ICEM CFD软件对轿厢进行了三维（3D）计算模型，以生成超过500万个网格节点的高质量网格。暖通空调系统的性能由气流模式、温度、相对湿度曲线以及最常用的舒适性参数来表征；基于范格模型的预测平均投票率（PMV）和预测不满意百分比（PPD）。在CFD模拟的帮助下，结果表明，30°的通风口方向为乘客提供了更好的热舒适性。 研究表明，由于太阳辐射，驾驶员附近的计算温度增加了约1.5°C。本文证明了通风口的进气温度对热舒适性有更好的影响，而不是在同一通风口方向使用更高的每小时换气次数（ACH）。关键词:热适应，热舒适，CFD，暖通空调，车厢温度，太阳辐射。引用:2018年年度会议，德克萨斯州休斯顿，会议论文

Cabin thermal comfort is predominantly impacted by the interior car cabin temperature. This paper aims to investigatethe impact of the orientation of the air vents in the private car cabin on temperature distribution as car cooling mode isstarted. In contrast, the prevailing cabin temperature depends on the size of the cabin, the number and shape of the airvents and the collective flow of the entire HVAC system and the interior materials of the dashboard, trims and seats. Inthis numerical investigation the effects of solar radiation on thermal comfort in a car cabin is critically analyzed.Normally, the air vents in the car cabin are manually adjustable to control the airflow direction. Computationalfluid dynamics (CFD) investigation was performed by using FLUENT 18.0 as a solver and a CFD processordeveloped by ANSYS Inc., in which the solar load model is embedded. A three -dimension (3D) computationalmodel for the car cabin has been conducted with ICEM CFD software for good quality grid generation of more than5,000,000 grid nodes. The performance of HVAC system is characterized by air flow patterns, temperature, relativehumidity contours as well as the most commonly used comfort parameters; the predicted mean vote (PMV) and thepredicted percentage of dissatisfied (PPD) based on Fanger model. With the help of CFD simulations it is shownhere that orienting air vents with 30°provided a better thermal comfort for passengers. The work showed that thecalculated temperature near the driver increased by about 1.5°C resulting of the solar radiation. This paperdemonstrated that the impact of inlet air temperature from vents has better effect on thermal comfort instead of usinghigher air change per hour (ACH) at the same vent direction.Key words: thermal adaptation, Thermal comfort, CFD, HVAC, Car cabin temperature, solar radiation.