水源热泵系统设计及地下温度场研究

发布时间：2018-03-03 11:01

本文选题：水源热泵　切入点：FLOWHEAT　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：地下水源热泵是利用作为可持续的环保能源的地下水,进行建筑物的采暖和制冷工作。利用地下水源热泵作为节能空调,是我国节能减排的重要技术。随着我国城市化进展,暖通空调将消耗更多的能源。近年来,由于水源热泵技术具有稳定性高、传热性好、效率高、经济环保等特点,建筑行业中,越来越多的建筑物采用地下水源热泵作为空调系统。我国幅员辽阔,地质条件复杂,水源热泵系统设计施工需要因地制宜,为了研究水源热泵对地下水温度场的影响,本文结合实际工程和数值模拟两方面,研究水源热泵工作过程中,地下含水层温度场的变化。对井系统是水源热泵中比较常用的采灌水方式,即一口井取水一口井灌水,本文研究的也是对井系统。首先利用FLOWHEAT建立地下含水层的物理模型,该模型有两层地下水,中间由隔水层分开。第一层含水层为浅水层,第二层为承压含水层。单井回灌工作模式下地下水温度场在x轴、y轴上变化速率相等,由回灌井逐渐向外扩散的不同等温层的水体形成同心圆。两层含水层的热物理参数相同,但是处在下层的承压含水层的低温水体扩散速率会比上层的潜水层的要快。双井同时抽灌的工作模式下,水平面的等温线在x轴方向上被拉长了,不再像单井系统像一个同心圆,而是像椭圆的样子。以回灌井为中心,在抽水井的一侧,两根等温线间的距离,比另一侧相同的等温线的距离要大。这证明了,抽水井的存在,对地下温度场产生了不可忽视的影响。提出热贯通现象,研究不同地质参数是否容易导致热贯通,以及何种条件下热贯通现象发生的几率比较大。渗透率对热贯通现象影响不大,孔隙度大的更不容易发生热贯通,含水层厚的更不容易发生热贯通。水源热泵系统的工作涉及模式与热贯通现象的关系,如两口水井间的距离、抽水量、回灌水温度。接下来结合实际工程案例,介绍水源热泵系统的具体参数设计和应用。
[Abstract]:Ground water source heat pump (GSHP) is an important technology for energy saving and emission reduction in China, which uses groundwater as a sustainable environmental energy source for building heating and refrigeration. HVAC will consume more energy. In recent years, water source heat pump technology has the characteristics of high stability, good heat transfer, high efficiency, economic and environmental protection, etc. More and more buildings use ground water source heat pump as air conditioning system. In order to study the influence of water source heat pump on groundwater temperature field, the design and construction of water source heat pump system need to be adapted to local conditions. In this paper, the variation of temperature field in underground aquifer during the working process of water source heat pump is studied in combination with practical engineering and numerical simulation. In this paper, we also study the dual well system. Firstly, we use FLOWHEAT to establish the physical model of the underground aquifer. The model has two layers of groundwater, the middle of which is separated by the separated layer. The first layer of aquifer is shallow water layer. The second layer is confined aquifer. The temperature field of groundwater varies at the same rate on the x axis and y axis under the single well recharge mode, and the water bodies of different isothermal layers gradually diffusing from the recharge well to the outside form a concentric circle. The thermal physical parameters of the two aquifers are the same. But the diffusion rate of the low-temperature water body in the lower confined aquifer is faster than that in the upper subsurface layer. The horizontal isotherm is elongated in the x-axis direction under the mode of simultaneous pumping and irrigation of two wells. No longer like a single well system like a concentric circle, but like an ellipse. Centered on a recharge well, on one side of the pumping well, the distance between the two isotherms is larger than the distance between the same isotherms on the other side. This proves the existence of the pumping well. This paper puts forward the phenomenon of thermal transfixion and studies whether different geological parameters can easily lead to thermal transfixion. The permeability has little effect on the thermal transfixion, and the high porosity is less likely to occur. The work of water source heat pump system involves the relationship between the mode and the heat transfixion phenomenon, such as the distance between two wells, the amount of pumping water, the temperature of water back irrigation. The parameter design and application of water source heat pump system are introduced.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83

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