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101.
Recently, as climate changes have manifested worldwide, every country is making efforts to prevent ozone depletion and global
warming. In the automotive industry, R-134a refrigerant is widely used in air conditioning systems because it has zero ozone
depletion potential (ODP). Unfortunately, its global warming potential (GWP) is high. Therefore, alternative refrigerants
are needed as a replacement for R-134a. R-152a is considered to be one of the better alternative refrigerants due to zero
ODP and low GWP. In this paper, the performance of an automotive air conditioning system using R-134a and one using R-152a
are compared experimentally at the bench level. The experimental apparatus simulated a real automotive air conditioning system
consisting of a cabin and engine room structure. The cooling capacity, condensing capacity, coefficient of performance (COP)
and power consumption characteristics of the automotive air conditioning system are evaluated by changing the air velocity
entering the condenser and the compressor rotation speed with the optimized refrigerant charge amount. Also, the performance
of the R-152a system was investigated by changing the thermostatic expansion valve which is set of values. The results of
this study show that the R-152a system is slightly better than the R-134a system, not only under driving conditions but also
under idling condition. R-152a refrigerant thus shows promise as an alternative refrigerant to replace the current standard,
R-134a, in automotive air conditioning systems. 相似文献
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分析了国外典型高速客车空气调节系统的特点,并结合客车高速化对其空调系统的影响,指出了我国高速客车空调系统的发展要求及思路。 相似文献
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随着人们生活水平的提高,旅客对列车的舒适度也提出了更高的要求,如何在保障旅客热舒适性的同时降低能耗已成为当前研究的热点问题.基于热舒适性评价指标和车厢能耗模型,针对影响列车空调系统能耗以及热舒适性的车厢内风速、温度和相对湿度加以综合探讨,提出了列车空调系统的节能调控措施,为列车空调系统的进一步节能改造和改善车厢内人体热... 相似文献
106.
利用FLUENT软件对北京DKZ1型地铁空调客车客室内的温度场和流场进行数值模拟,并在不同的送风温度和送风速度条件下选取典型面进行对比模拟分析,得出满足人体舒适性要求的送风温度和送风速度,为城轨空调客车空调系统的设计提供参考。 相似文献
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介绍了风神蓝鸟轿车自动空调系统LED(发光二极管)和字节、传感器线路、方式门和进气门位置、执行器、温度传感器以及辅助机构的故障诊断方法。 相似文献
109.
随着城市地铁工程的建设以及沿线部分车站与周边用地条件的限制,冷却塔的布置与城市景观不协调的现象及对周边居民的影响日渐凸显。介绍分析4种冷却塔布置形式(地面冷却塔、下沉式冷却塔、地下封闭式冷却塔和蒸发式冷水机组),从对周边环境的影响、技术特点、工程初投资情况及运营费用等方面对比分析这几种冷却塔布置形式。认为,地铁车站应结合环境评价及建设条件进行综合对比,并选取对应的辅助措施。 相似文献
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船舶空调舱室热舒适性是影响船员工作效率和生活品质的重要因素。文章分析了影响空调舱室热舒适性的诸多因素,讨论了PMV (Predicted Mean Vote 预测平均满意值) 指标的作用及其运算方法。建立了舱室简化模型,并结合实际海况,计算了不同温度、相对湿度组合下的PMV,PPD(Predicted Percentage of Dissatisfied, 预测不满意率)值及系统热负荷,分析了舱室内温度、相对湿度对其热舒适性及能耗的影响。在满足热舒适性指标的情况下,优化船舶空调设计参数以实现节能的目的。文章对船舶空调的设计及舱室温微气候参数的选择具有借鉴意义。 相似文献