土壤冷源直供地板辐射供冷系统运行特性模拟研究

发布时间：2018-10-09 19:24

【摘要】：传统土壤源热泵的理论、应用研究已经十分成熟,并且在我国的使用得到了快速的增长。本文在传统土壤源热泵的基础上,提出了一种新的使用方法。即在过渡季节或者湿度满足的条件下,关闭冷水机组,采用双U型地埋管换热器将土壤冷能直接供入室内,并在室内采用地板辐射进行供冷。本文以地埋管换热理论中的二维有限长线热源模型为基础,建立了双U型地埋管换热的非稳态数学模型,并对数学方程进行了离散,为了求解稳定性的需要,采用隐式差分的方式进行计算。针对室内侧地板辐射供冷,建立了完整的非稳态数学模型,该模型考虑了室外气象条件对于室内的影响,同样采用隐式差分的方式进行计算。上述数学模型均利用Visual Basic 6.0工具进行求解。通过对采用该系统的天津市天友建筑设计办公建筑的实测,验证了数学模型的正确性。本文利用所建立的数学模型对土壤冷源直供地板辐射供冷系统的运行特性进行了模拟研究。首先研究了直接供冷系统的供冷能力,建立了表征直接供冷系统供冷能力的指标及水泵模型,在此基础上研究了地埋管水流量、土壤平均温度、地埋管埋设深度对单井埋深取冷量的影响,以及土壤平均温度、供水温度对季节供冷系数的影响;然后研究了直接供冷模式和开启冷水机组模式下的土壤温度场随时间的变化情况;之后对所选的房间模型研究了影响地板表面平均温度的因素,研究了地板表面平均温度对人体热舒适的影响,研究分析了系统供冷小时数的影响因素;最后对直接供冷模式和开启冷水机组模式下的能耗进行模拟,结果表明直接供冷模式比开启冷水机组模式节能54%,为土壤冷源直供地板辐射供冷系统的运行特性及策略等方面的研究提供了技术储备和理论支持。
[Abstract]:The theory and application of traditional ground source heat pump (GSHP) is very mature, and its application in China has been increasing rapidly. Based on the traditional ground source heat pump, a new method is proposed in this paper. That is to say, under the condition of transitional season or humidity satisfied, the chiller is closed, and the soil cooling energy is directly supplied into the room by double U-type buried tube heat exchanger, and the floor radiation is used for cooling in the indoor. Based on the two-dimensional finite line heat source model in the theory of buried pipe heat transfer, the unsteady mathematical model of double U type buried pipe heat transfer is established, and the mathematical equations are discretized to solve the need of stability. Implicit difference method is used to calculate. A complete unsteady mathematical model is established for indoor floor radiation cooling. The model takes into account the influence of outdoor meteorological conditions on the indoor, and the implicit difference method is also used to calculate the model. All the above mathematical models are solved by Visual Basic 6.0. The correctness of the mathematical model is verified by measuring the office buildings designed by Tianyou architecture in Tianjin. In this paper, the mathematical model is used to simulate the operating characteristics of the radiant cooling system for soil cooling directly supplied by the floor. Firstly, the cooling capacity of the direct cooling system is studied, and the indexes and pump models are established to characterize the cooling capacity of the direct cooling system. On the basis of this, the water flow rate of the buried pipe and the average temperature of the soil are studied. The influence of buried pipe depth on the cooling rate of single well, and the influence of soil average temperature and water supply temperature on seasonal cooling coefficient; Then, the variation of soil temperature field with time in direct cooling mode and open chiller mode is studied, and then the factors influencing the average temperature of floor surface are studied for the selected room model. The influence of the average floor surface temperature on the thermal comfort of the human body was studied, and the factors affecting the cooling hours of the system were analyzed. Finally, the energy consumption in the direct cooling mode and the open chiller mode was simulated. The results show that the direct cooling mode can save 54% energy compared with the open chiller mode, which provides technical reserve and theoretical support for the study of the operating characteristics and strategy of the radiant cooling system of soil cooling directly supplied by the floor.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU83

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