热压与空气—土壤换热器（EAHE）耦合通风换热理论模型研究

发布时间：2018-03-24 20:24

本文选题：热压通风　切入点：地道风系统(EAHEs)　出处：《重庆大学》2016年硕士论文

【摘要】：自然通风作为一种简单且有效的通风调节方式早在几千年前就已经在世界各地被广泛应用,但是其调节效果受制于室外热环境。随着现代暖通空调技术的发展,大量的空调设施层出不穷,人们开始主动的调节室内热环境,与此同时也加剧了能源消耗和环境问题。面对日益凸显的高能耗问题,发展绿色节能技术,实现可持续发展已经成为当今社会乃至国家所关注的重要课题。由此,自然通风以及相应的复合式系统作为节能、环保且经济的通风形式再次被各国学者所重视。地道风系统(EAHEs)是一种比较典型的复合式通风系统形式,通过热压诱导自然通风或者机械通风的方式将室外空气引入地道,进而改善室内的热湿环境。其中自然通风与地道风技术的结合则充分发挥了两者的优势,实现了节能环保可持续发展。然而针对这种将地上建筑与地道系统耦合在一起进行分析的理论模型则相对较少,尤其是地道风系统中通过热压诱导自然通风方式提供驱动力的耦合通风换热理论模型。本文首先基于波动理论的假设,认为建筑热压耦合通风换热模式下室内热环境的参数存在非简谐多频波动现象。在室内温度始终大于等于室外温度时,即0(t)(t)iT?T的工况下,根据傅里叶变换理论,对单体建筑热压通风与蓄热非线性耦合理论进行了分析推导,将复杂的非线性耦合问题线性化,以解析表达式的形式得出室内空气温度、通风量与建筑结构尺寸、蓄热体量及负荷大小的关系,使得计算更加简便有效。然后搭建小尺寸单区两开口建筑自然通风模型实验台,在周期性波动的室外热环境下,将监测得到的实验数据与理论模型进行对比分析,验证了在0(t)(t)iT?T的工况下非稳态建筑自然通风与蓄热非线性耦合理论模型的准确性。同时也证实了建筑自然通风与蓄热非线性耦合现象中非简谐多频波存在的可能性。其次针对地道内土壤渗透半径的问题,提出一种周期性波动热环境下评价地道风系统换热性能的分析模型。通过引入“过余波动温度”的概念来分析地道与土壤之间温度波动的交互作用,从而得出年、日周期下地道内空气温度振幅和相位的解析式,使得地道风系统换热分析过程更加简单和高效。最后将地道系统与地上建筑耦合在一起进行分析,在0(t)(t)iT?T的工况下,得出室内空气温度和通风量的显式表达式。然后利用CFD仿真工具模拟周期性非稳态下土壤换热器耦合热压通风过程,同时将数值模拟结果与数学模型进行了对比分析,验证了模型的准确性,为实际工程设计提供了更为准确和简便的处理方法。
[Abstract]:Natural ventilation, as a simple and effective way to regulate ventilation, has been widely used in many parts of the world thousands of years ago, but its effect is limited by the outdoor thermal environment. With the development of modern HVAC technology, natural ventilation has been widely used in many parts of the world. A large number of air-conditioning facilities emerge in endlessly, people begin to regulate indoor thermal environment actively, at the same time, it also exacerbates the energy consumption and environmental problems. Facing the increasingly prominent problem of high energy consumption, the development of green energy-saving technology, The realization of sustainable development has become an important issue that the society and even the country have paid close attention to. As a result, natural ventilation and the corresponding compound system are used as energy saving. The environmental protection and economic ventilation form is paid more attention to by scholars from all over the world. EAHEs is a typical composite ventilation system which introduces outdoor air into tunnels by means of natural ventilation or mechanical ventilation induced by hot pressure. The combination of natural ventilation and underground wind technology gives full play to the advantages of both. The energy saving and environmental protection sustainable development has been realized. However, there are relatively few theoretical models for the analysis of the above ground building and tunnel system. In particular, the coupled ventilation heat transfer model in tunnel wind system, which provides driving force through hot pressure-induced natural ventilation, is first based on the assumption of wave theory. It is considered that there is a non-harmonic multi-frequency fluctuation phenomenon in the indoor thermal environment parameters under the heat transfer mode of coupled thermal pressure ventilation. When the indoor temperature is always greater than or equal to the outdoor temperature, that is, the temperature of the indoor thermal environment is 0? On the basis of Fourier transform theory, the nonlinear coupling theory of thermal pressure ventilation and heat storage in single building is analyzed and deduced. The complex nonlinear coupling problem is linearized, and the indoor air temperature is obtained by analytical expression. The relationship between ventilation volume and the size of building structure, heat storage volume and load makes the calculation more convenient and effective. Then, the experimental bench of natural ventilation model of small size, single area and two openings is built, which can be used in outdoor thermal environment with periodic fluctuation. The experimental data obtained from the monitoring are compared with the theoretical model, and the experimental data are compared with the theoretical model. The accuracy of the nonlinear coupling model of natural ventilation and heat storage in unsteady buildings under the condition of T. the possibility of non-harmonic multifrequency wave in the nonlinear coupling of natural ventilation and heat storage in buildings is also confirmed. The problem of soil penetration radius in tunnels, This paper presents an analytical model for evaluating the heat transfer performance of wind system in a periodically fluctuating thermal environment. By introducing the concept of "excess fluctuation temperature", the interaction between tunnel and soil temperature fluctuation is analyzed, and the year is obtained. The analytical expressions of the amplitude and phase of air temperature in the tunnel under the daily cycle make the heat transfer analysis process of the tunnel wind system simpler and more efficient. Finally, the tunnel system is coupled with the above ground building to analyze the temperature amplitude and phase of the air in the tunnel. The explicit expressions of indoor air temperature and ventilation rate are obtained under the condition of T, and then the coupled hot pressure ventilation process of soil heat exchanger under periodic unsteady condition is simulated by CFD simulation tool. At the same time, the numerical simulation results are compared with the mathematical model, which verifies the accuracy of the model, and provides a more accurate and simple processing method for practical engineering design.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU834

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