贴附射流与辐射冷顶板复合空调系统的性能研究

发布时间：2018-01-03 22:17

本文关键词：贴附射流与辐射冷顶板复合空调系统的性能研究　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：辐射冷顶板空调系统作为一种近几年在国内开始应用的新型空调方式,具有节能、舒适性强、污染性小等优点,十分切合当今人们正密切关注的环保、节能以及室内环境质量问题。但同时我们也注意到,它存在着易结露、供冷能力有限、新风量不足等缺点,制约了其推广应用。本文的研究重点即在于研究辐射冷顶板系统与独立新风贴附射流复合运行后防止辐射冷顶板结露的效果,以及该复合空调的性能参数设置不同时对室内热环境的影响。本文首先对采用贴附射流送风方式防止辐射冷顶板系统结露情况的效果进行了研究。通过搭建试验台,将辐射冷顶板系统与独立新风贴附射流系统复合运行,并将之与不采用贴附射流送风方式的辐射冷顶板+独立新风系统进行了简单的对比实验。实验发现,相较于后者,采用贴附射流送风方式确实能够有效防止辐射冷顶板结露现象的发生。与此同时,由于存在贴附射流的对流影响,还能提升辐射冷顶板空调系统的供冷能力。之后,本文又通过Fluent软件对该复合系统在实际房间中应用的情况进行了CFD模拟,通过分析室内空气温度场、速度场以及辐射冷顶板附近的相对湿度分布情况发现,虽然在本例中辐射冷顶板不会结露,且室内热舒适性满足人体需求,但实际上起作用的是独立新风系统,而贴附射流由于新风量小、风速低的原因并未有效形成,这种独立新风的作用效果存在着条件限制。如果冷负荷需求增大,辐射冷顶板温度降低,则仍有结露风险。该模拟结果解释了实验对比情况的产生原因,也反映了采用贴附射流送风方式对于辐射冷顶板防结露的重要性。因此,针对实验及模拟的结果,本文继续对上例进行CFD模拟研究,提出了各种不同的贴附射流设置条件,并就贴附射流送风形式设置不同所造成的射流贴附情况、辐射冷顶板结露情况及室内热环境情况进行了对比分析,最后提出了贴附射流设置方案,可在送风量有限的情况下有效形成贴附射流,防止辐射冷顶板空调系统结露,并满足室内热舒适性要求,为该复合空调系统在实际工程上的应用提供了一定参考。
[Abstract]:Radiant cooling ceiling air-conditioning system as a new type of air conditioning, the beginning of the last few years in domestic application has the advantages of energy saving, high comfort, low pollution, very fit today's people are paying close attention to environmental protection, energy saving and indoor environmental quality problems. But at the same time, we also noticed that it exists for condensation. Cooling capacity is limited, disadvantages of lack of fresh air volume, restricts its application. The emphasis of this paper is research on radiant cooling ceiling system with independent air jets after the operation to prevent cold radiation composite roof condensation effect, and the performance parameters of the composite air conditioner on the indoor thermal environment effect. Firstly, the attached jet ventilation to prevent condensation cold radiation was studied. The effect of roof system by building test platform, the radiant cooling ceiling system with independent air attached jet system The composite operation, and the roof radiant cooling + independent fresh air system and the attached jet ventilation compared with the simple experiment. The experimental results showed that, compared with the latter, the attached jet ventilation can effectively prevent the occurrence of roof radiant cooling condensation phenomenon. At the same time, due to the presence of convection effect attached jet, but also enhance the radiant cooling ceiling air-conditioning system cooling capacity. After this, through CFD simulation application of the composite system in the actual room in the case of the Fluent software, through the analysis of indoor air temperature field, velocity field and radiation near the cold roof relative humidity distribution was found, although in this in cases of radiant cooling roof not dew, and the indoor thermal comfort to meet human needs, but in fact it is the independent fresh air system, and the attached jet due to the new air volume, low wind speed and the reasons No valid form, the effect of the existence of independent fresh air conditions. If the cooling load demand increases, roof radiant cooling temperature is reduced, but there is still the risk of condensation. The simulation results explain the causes of the situation of experiment, also reflects the attached importance to the shooting flow wind type radiant cooling and condensation prevention of roof. Therefore, according to the experimental and simulation results, this paper proceed CFD simulation of the above example, put forward different attached jet setting conditions, jet and air the form produced by setting different attached jet attachment condition, radiant cooling and condensation roof indoor thermal environment were analyzed. Finally, the attached jet setting scheme in the air under the condition of limited effective form attached jet, prevent the radiant cooling ceiling air-conditioning system of condensation, and meet the indoor thermal comfort requirements, for the complex The combined air conditioning system provides a certain reference for the application of the actual engineering.

【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU831.3

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