共查询到19条相似文献,搜索用时 718 毫秒
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本文简要介绍了深圳火车东站候车大厅空调送风的设计方案,并应用CFD软件对分层空调夏季设计工况下气流分布特性进行了模拟分析,得到了候车厅的速度场、温度场以及热舒适度分布情况。研究结果表明该设计方案可行,在喷口送风角度为25°时送风效果最好,可以达到设计要求的室内温、湿度与速度分布,并满足室内舒适性的要求。 相似文献
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采用数值模拟的方法研究了单侧喷口送风的分层空调和单侧喷口加二次气流的改进型分层空调2种气流组织,对冬季室内的垂直温度分布、居住域温度场、速度场以及热负荷等进行了分析,据此讨论了冬季室内的热舒适性和节能性。经过与试验进行对比验证后,数值模拟拓展模拟研究表明:对于单侧喷口送风有、无二次气流2种分层空调形式,在送风量和送风温度以及边界条件均相同的情况下,室内居住域的温度分别为21.9℃和21.1℃,以前者同样的居住域温度为条件,计算两者空调供热负荷,得到前者节能率为12.5%。同时以两者居住域的ADPI作为舒适性评价依据,研究分析得到两者分别为48.5%和22.7%,前者较好,即对于本文研究对象而言,单侧喷口加二次气流的改进型分层空调具有一定的节能效果且提高了室内热环境的舒适性。 相似文献
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以一台变转速热泵空调器为研究对象,测试其在冬季用R32做制冷剂时机组的能效及换热器的传热性能,以研究制热工况下空调系统中用R32作为替代制冷剂的可行性。试验测量参数包括蒸发器(室外机)和冷凝器(室内机)的传热系数、换热量、总压力降以及整机制热工况下的COP。通过结构匹配的室内、外侧两换热器在系统运行中同步测量,结果表明:冬季名义制热工况下,R32空调系统的制热能力比用R410A高出约3.0%,蒸发器、冷凝器的传热系数也有所提高,其中蒸发器的传热性能提高约6.0%,冷凝器传热性能提高约6.7%,而压降对比则变化不大。 相似文献
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通过对夏热冬冷地区数码涡旋多联式空调系统制热运行的试验研究,得出了室内机小时制热量、系统小时耗功和小时供热性能系数随室内温度和室外温度的变化规律,小时供热性能系数随部分负荷率的变化规律,并对除霜工况进行了分析. 相似文献
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应用CFD方法分析了空调房间内5种气流组织条件下污染物的浓度分布情况,研究结果表明,孔板送风形式更有利于污染物的消除。针对孔板送风模型,对不同新风量、不同污染源散发量等工况进行了数值模拟,得出了在这些工况下污染物浓度的分布特性和变化规律,从控制室内污染物的角度为空调系统的设计提供参考。 相似文献
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为改善飞机地面空调恒定温度送风所造成的改舱客机舱内乘客热舒适性不佳的问题,建立了改舱后的Boeing 737客舱模型,并通过实验舱对仿真模型进行了试验验证,证明了此模型的合理有效性。在此改舱模型的基础上,运用CFD技术,模拟仿真出地面空调不同送风温度下,改舱客机的风速场与温度场,且针对改舱客机空调送风口与乘客座位距离不一致的特点,采用修正后的加权PMV评价客舱内的整体热舒适性,再结合EQT指标进一步研究每位乘客的局部热舒适性,最终得出满足热舒适性的最佳送风温度区间,为地面空调的合理送风提供理论依据。 相似文献
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Environmental control strategy via computerized implementation is one of the most efficient approaches to integrate new advanced
knowledge in research of human thermal comfort to a mechanical air-conditioning unit. Recently, a new conceptual development
in designing air-conditioning systems has indicated that the indoor comfort temperature strongly depends upon changes of the
outdoor air temperature rather than to be a conventional fixed temperature set-point. The explanation is due to occupants’
adaptability of thermal comfort to a dynamic environment in terms of their clothing and/or activities while the outdoor temperature
can be explicitly used as an ultimate indicator of such changes to empirical function of the indoor comfort temperature. In
this paper, the first prototype embedded system is developed to emulate such an adaptive algorithm to numerically determine
an indoor comfort temperature for a real-time control in an air-conditioning system. From a theoretical point of view, an
adaptive comfort model together with grey prediction model is presented for exploring a practical application of a comfort
temperature-based control for a single air-conditioned space, so as to show the viability of the proposed methodology by simulated
results. The field studies by interview survey of satisfaction on thermal comfort within an air-conditioned reading room of
a library confirm the viability of the proposed real-time computerized implementation of adaptive indoor comfort temperature
via the embedded system for a conventional air-conditioning unit in practical uses. 相似文献
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P. Thirumal K. S. Amirthagadeswaran S. Jayabal 《Journal of Mechanical Science and Technology》2014,28(5):1899-1907
Considering that air conditioning is widely applied for improving human standard of living, this present investigation is focused on the optimization of indoor air quality characteristics of air-conditioned cars using the Gray relational analysis (GRA) and the response surface methodology (RSM). The air-conditioned space is selected and the experiments are planned as per experimental design to study the effects of human load, fresh air supply, and air velocity on human comfort conditions. Mathematical models are developed to predict the comfort conditions, namely temperature, CO2 level, and relative humidity over a specified range of input conditions. The optimum values of comfort conditions for varying input conditions are found by assigning weightages to individual responses using GRA and RSM. 相似文献