共查询到18条相似文献,搜索用时 93 毫秒
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目前纯电动汽车续航里程受环境影响程度较大。本文以SUV车型为研究对象,利用计算流体力学软件搭建了乘员舱的数学模型,耦合了人体热生理模型,将Berkely热舒适性评价模型用于乘员舱内人体热舒适性的评测。针对高温工况分别就送风温度、送风速度和送风湿度对乘员舱内部热环境、空调的总负荷以及人体热舒适性的影响程度进行了研究。结果表明,在送风风速由低到高改变的过程中,乘员的整体热舒适性会先上升,后下降,且能耗也随之升高。且在较低送风风速条件下,送风温度的变化对整体热舒适影响有限。送风湿度对热舒适的影响程度要弱于送风温度和送风风速。同时本文将送风风温、送风相对湿度、送风风速作为自变量,把乘员的整体热感觉、整体热舒适指标乃至空调系统总负荷当作研究对象,拟合出它们之间关系的回归方程。利用多参数优化分析的方式,不同送风参数对热舒适性和空调负荷的影响进行耦合分析。把乘员的整体热舒适指标的目标值设置成0,把空调系统热负荷降目标值设置成最小值,并且使乘员的整体热舒适指标与空调系统负荷二者的权重均设置成1,求取最佳方案,实现在提高热舒适性的同时减小空调系统热负荷的目的。 相似文献
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针对某汽车车内热-流场分布不合理而影响乘员热舒适性的问题,通过激光扫描和逆向工程建立原空调风道的几何模型,在建立合理的流体力学网格模型的基础上,采用Realizable k-ε两方程湍流模型和"壁面函数法"对风道内的流动进行流体力学稳态仿真计算,分析了原风道各出风口流量分配不合理的原因,并对原结构进行了优化设计和改进,使各出风口的流量满足设计要求,从而保障乘员的热舒适性,为汽车空调风道设计和优化改进提供依据。 相似文献
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基于人体热调节模型的乘员舱热舒适性分析 总被引:1,自引:0,他引:1
为研究乘员的动态热反应规律,以提高乘员舱内的热舒适性,综合考虑环境参数、人体调节、代谢水平、服装热阻等因素,建立车内热环境与人体热调节模型耦合计算方法,计算乘员重要热感应部位头部、胸部和四肢的皮肤平均温度动态变化情况,并分析人体热调节反应和热舒适性变化规律。结果表明,乘员舱热环境与人体热调节模型的耦合计算方法可较可靠地分析乘员动态热反应和热舒适性;在暖风系统开启时,车内热环境瞬态变化,在不同乘坐位置乘员不同身体部位的皮肤温度变化存在差异;在热环境中,乘员皮肤温度上升,人体的热调节参数血管舒张量和出汗量增加,从而带走体内热量,维持体温恒定。 相似文献
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载人车室内部空气流场温度场的数值模拟 总被引:3,自引:1,他引:3
本文通过人体热特性分析,讨论了人体热边界条件的确定,在载人车室内部空气流动数值计算的基础上,对人体的热边界条件的选取进行了研究探讨,在此基础上建立了数字式暖体假人模型,为汽车空调热舒适性研究提供分析工具。 相似文献
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C. -H. Chien J. -Y. Jang Y. -H. Chen S. -C. Wu 《International Journal of Automotive Technology》2008,9(4):437-445
People use cars so frequently that they always consider the air-conditioning, and thermal comfort of the driver and passenger
when buying a new car. Therefore accurate simulation of the thermal performance of automobile air conditioners to improve
human comfort has become increasingly important. In order to improve the thermal comfort of passengers, 3-D flow motion and
thermal behavior within vehicles must be analyzed. In this paper, a numerical simulation was used to investigate thermal behavior
in a vehicle. Because air temperature at an air vent is related to the cooling capacity of the air conditioner, the cooling
capacity was calculated using ɛ-NTU (effective number of transfer unit) theoretical equations. Using the air temperature relationship between inlet and outlet
vents as boundary conditions, a 3-D unsteady κ-ɛ turbulent model was used to give a transient analysis simulation of the temperature field and flow conditions in a vehicle’s
passenger cabin. Cooling cycle analysis and conjugate heat transfer analysis at the inside surface of the cabin’s ceiling,
floor and sides were also considered. The predicted temperature distributions in the vehicles passenger cabin were in good
agreement with those obtained experimentally. 相似文献
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纯电动大巴空调冬季制热是目前行业普遍关注的焦点问题,受大巴空调厂家技术影响,大部分电动空调热泵制热在环境温度0℃左右将无法启动,所以目前行业冬季制暖主要采用燃油炉或PTC加热方式。燃油炉与PTC加热能耗高,严重影响整车续航里程。热泵大巴空调可实现-15℃正常热泵制热,补气增焓技术可实现-25℃正常热泵制热。另外,在冬季制热时,暖风从上部的风道往下吹,大部分热风下不去,造成了车厢上部温度高,脚部温度过低,非常影响舒适性。通过从上部风口引一些风道到脚部的方式,提高车厢底部的热风循环,提高车厢热泵制热的舒适性,从而验证了大巴车厢底部出风对热泵空调制热效果的影响。综合上述,对热泵空调在低温地区冬季热泵制热效果及节能效果进行对比测试,通过对比热泵空调和电加热器的温升速率、耗电量和舒适性等参数,可得知热泵空调升温速度快、温控精度高、耗电量少,变频热泵空调更舒适、更节能。 相似文献
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Ventilation system in a bus is employed to provide good indoor air quality and thermal comfort for passengers. Poor ventilation system will increase the concentration level of air contaminants which could affect the passenger’s health. The presence mixing ventilation system used in many buses is not efficient in removing the air contaminants from the passenger compartments. This article presents a study on the effects of using different ventilation setups on the concentration level of gases and particulate matters inside a passenger compartment of a university’s shuttle bus. The goal is to find a suitable layout of the air supply diffusers and air return grilles that would lower the concentration level of contaminants inside the passenger compartment. Field measurements were carried out to quantify the concentration of gases (carbon monoxide, carbon dioxide and formaldehyde) and particulate matters (PM1, PM2.5 and PM10). The measurements were done at the front section of the bus compartment, close to the front door. The data were acquired in the morning, afternoon and evening hours during a clear and sunny day. The bus travelled along an in-campus road with no passengers. A simplified three-dimensional model of the bus compartment was developed using computational fluid dynamics software. Flow analyses were carried out to predict distribution of gases and particulate matters concentration. The concentrations of carbon dioxide, carbon monoxide, formaldehyde and particulate matters obtained from the field measurements were used as boundary conditions and for validating the computational model. A parametric study was carried out to identify a suitable layout of air supply diffusers and air return grilles that would lower the concentration level of the air contaminants. Two types of ventilation systems were considered namely a displacement ventilation and an underfloor air distribution. Results show that the underfloor air distribution system is more effective in reducing the concentration level of gases and particulate matters inside the passenger compartment compared to the displacement ventilation system. 相似文献
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应用流体分析软件Fluent和发动机模拟软件GT-Power分别对某型号空滤器进气系统的气动性能和消声性能进行了模拟计算。分别研究了进出气管的管径大小和插入长度对空滤器进气系统的气动性能和消声性能的影响。研究结果表明,减小空滤器的进出气管直径均能改善空气滤清器进气系统的消声性能,但其气动性能有所恶化,而且通过比较发现,进气管的管径大小比出气管对空滤器的气动性能和消声性能影响更大;进出气管的插入对于此种结构的空滤器进气系统的气动和消声性能并无改善。文章最后根据空滤器消声性能的不足和发动机进气口的阶次噪声曲线,设计了一个谐振腔,改善了其噪声性能。 相似文献
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汽车车内空气质量标准法规现状 总被引:1,自引:0,他引:1
介绍车内空气污染的主要来源和危害,以及国内外车内空气质量标准法规的状况;提出我国应尽快对车内空气质量实施国家强制性法规、政策、标准等管理制度的建议。 相似文献