酒店类建筑混合式土壤源热泵系统冷却塔控制策略研究

发布时间：2018-05-01 02:20

本文选题：混合式土壤源热泵系统 + 冷却塔控制策略　；参考：《华中科技大学》2013年硕士论文

【摘要】：地源热泵系统以其节能、环保、高效的特点得到了越来越广泛的应用。在以武汉为典型城市的夏热冬冷地区，由于夏季冷负荷大于冬季热负荷，为了保持土壤的热平衡，采用的是地埋管+冷却塔的混合式土壤源热泵系统形式。对于混合式土壤源热泵系统，地埋管和冷却塔的匹配运行成为了一个难点。冷却塔开启时间过多，冷却塔环路会消耗大量的能源，冷却塔开启时间过少，则会导致热泵进口流体温度升高、土壤温度升高、热泵机组性能下降，同样也会造成系统能耗的升高，同时，何时开启冷却塔也是一个关键。因此，如何对冷却塔进行运行控制，使得混合式土壤源热泵系统长期高效的运行是一个非常值得研究的问题。本文以武汉某酒店建筑为研究对象，在TRNSYS平台下建立混合式土壤源热泵系统模型。针对热泵进、出口流体最高温度控制策略、温差控制策略分别选取了多个控制工况点进行了20年的仿真模拟，，得出了这四种策略下的最优控制工况点。并对这四种策略的最优控制工况点进行了比较分析，结果表明，采用最高温度控制策略时，对热泵进口流体温度进行控制更优；而采用温差控制策略时，对热泵出口流体温度进行控制更优。然后，在此研究结论的基础上提出了一种新的控制策略，即对热泵进口流体进行最高温度控制，而对热泵出口流体进行温差控制的综合控制策略，并对其选取了25个控制工况点进行了仿真模拟，找到其最优控制工况点。最后，用上面得到的三种最优控制策略与传统的控制策略进行比较，结果表明：热泵进、出口流体温度采用综合控制策略时，热泵系统全生命周期（20年）的总能耗最小；热泵出口流体温度采用温差控制策略时土壤的最大平均温度的增加最小。
[Abstract]:Ground-source heat pump system has been more and more widely used because of its energy saving, environmental protection and high efficiency. In the hot summer and cold winter region with Wuhan as the typical city, because the cooling load in summer is larger than the heat load in winter, in order to maintain the heat balance of soil, the hybrid ground source heat pump system with ground buried pipe cooling tower is adopted. For hybrid ground source heat pump system, the matching operation of buried pipe and cooling tower becomes a difficulty. If the cooling tower has too much open time, the cooling tower loop will consume a lot of energy. If the cooling tower starts too little, it will cause the heat pump inlet temperature to rise, the ground temperature to rise, and the performance of the heat pump unit to decline. It also leads to higher energy consumption, and when the cooling tower is opened is a key. Therefore, how to control the cooling tower and make the hybrid ground source heat pump system run efficiently for a long time is a problem worth studying. Based on a hotel building in Wuhan, a hybrid ground source heat pump system model based on TRNSYS is established in this paper. Aiming at the maximum temperature control strategy and temperature difference control strategy of heat pump flow in and out of the water, several control working conditions were selected for 20 years' simulation, and the optimal control operating conditions were obtained under these four strategies. The results show that it is better to control the inlet temperature of the heat pump with the maximum temperature control strategy, while the temperature difference control strategy is better than that of the temperature difference control strategy. It is better to control the fluid temperature at the outlet of the heat pump. Then, based on the conclusion of the study, a new control strategy is proposed, that is, the maximum temperature control for the inlet fluid of the heat pump, and the comprehensive control strategy for the temperature difference control of the flow at the outlet of the heat pump. The 25 control conditions are simulated and the optimal control conditions are found. Finally, compared with the traditional control strategy, the results show that the total energy consumption of the whole life cycle (20 years) of the heat pump system is the least when the temperature of the inlet and outlet fluid is controlled by the integrated control strategy. The maximum average temperature of the soil is minimum when the temperature of the outlet fluid is controlled by temperature difference.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

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