办公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：2018-09-16 19:11
【摘要】：地源热泵系统是一种高效节能的空调系统，具有良好的发展前景。在以武汉为典型城市的冷负荷占优地区，由于冷热负荷比较大，且制冷季比供热季长，普通的土壤热泵系统的使用容易产生土壤热积累问题，故一般采用以冷却塔为辅助散热设备的混合式土壤源热泵系统来解决该问题。 在实际工程中，由于设计、施工、土壤自身恢复能力等原因，导致混合式土壤源热泵系统土壤热积累的问题依然存在。因此，我们有必要对混合式土壤源热泵系统进行优化设计，其中，优化冷却塔的控制策略是改善混合式土壤源热泵系统运行效率和土壤热积累问题的重要手段。 本文以武汉地区某办公楼建筑为研究对象，利用TRNSYS对其采用的混合式土壤源热泵系统冷却塔的控制策略进行模拟研究，对比了温差控制和基于此控制的夜间开启冷却塔与地埋管串联为土壤降温的控制策略，并在上述两种控制的基础上，提出对夜间开启冷却塔的时间采取某种温差控制，即当板式换热器的地埋管侧与冷却塔侧水温差值低于某设定值时，，关闭冷却塔和水泵，防止热量由冷却塔通过板式换热器带入地埋管侧。 模拟结果表明，夜间开启冷却塔可以缓解土壤热积累问题，但开启时间决定了系统的节能与否；对夜间冷却塔的开启采取某种温差控制时，可以进一步缓解土壤热积累问题，系统更节能，并且运行费用最低。本文的结论对混合式土壤源热泵系统在实际工程中的应用具有一定参考价值。
[Abstract]:Ground-source heat pump system is a high-efficiency energy-saving air-conditioning system, and has a good development prospects. In the predominance of cold load in Wuhan as a typical city, because the cold and heat load is relatively large and the refrigeration season is longer than the heating season, the common ground heat pump system is easy to produce the problem of soil heat accumulation. Therefore, a hybrid ground source heat pump system with cooling tower as auxiliary cooling equipment is used to solve this problem. In practical engineering, the problems of soil heat accumulation in hybrid ground source heat pump system still exist due to the design, construction and soil recovery ability. Therefore, it is necessary to optimize the design of hybrid ground-source heat pump system. Among them, optimizing the control strategy of cooling tower is an important means to improve the operational efficiency and soil heat accumulation of hybrid ground-source heat pump system. In this paper, the control strategy of the cooling tower of the hybrid ground source heat pump system is simulated by using TRNSYS in an office building in Wuhan area. This paper compares the control strategy of temperature difference control with that of open cooling tower and buried pipe in series for soil cooling based on this control. On the basis of the above two kinds of control, some temperature difference control for the time of opening cooling tower at night is put forward. That is, when the water temperature difference between the underground tube side of the plate heat exchanger and the side of the cooling tower is lower than a certain set value, the cooling tower and water pump are closed to prevent the heat from the cooling tower passing through the plate heat exchanger into the underground tube side. The simulation results show that the nocturnal open cooling tower can alleviate the problem of soil heat accumulation, but the opening time determines the energy saving of the system, and when some temperature difference control is adopted for the opening of the night cooling tower, the problem of soil thermal accumulation can be further alleviated. The system is more energy efficient and runs at the lowest cost. The conclusion of this paper has certain reference value for the application of hybrid ground source heat pump system in practical engineering.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU831
[Abstract]:Ground-source heat pump system is a high-efficiency energy-saving air-conditioning system, and has a good development prospects. In the predominance of cold load in Wuhan as a typical city, because the cold and heat load is relatively large and the refrigeration season is longer than the heating season, the common ground heat pump system is easy to produce the problem of soil heat accumulation. Therefore, a hybrid ground source heat pump system with cooling tower as auxiliary cooling equipment is used to solve this problem. In practical engineering, the problems of soil heat accumulation in hybrid ground source heat pump system still exist due to the design, construction and soil recovery ability. Therefore, it is necessary to optimize the design of hybrid ground-source heat pump system. Among them, optimizing the control strategy of cooling tower is an important means to improve the operational efficiency and soil heat accumulation of hybrid ground-source heat pump system. In this paper, the control strategy of the cooling tower of the hybrid ground source heat pump system is simulated by using TRNSYS in an office building in Wuhan area. This paper compares the control strategy of temperature difference control with that of open cooling tower and buried pipe in series for soil cooling based on this control. On the basis of the above two kinds of control, some temperature difference control for the time of opening cooling tower at night is put forward. That is, when the water temperature difference between the underground tube side of the plate heat exchanger and the side of the cooling tower is lower than a certain set value, the cooling tower and water pump are closed to prevent the heat from the cooling tower passing through the plate heat exchanger into the underground tube side. The simulation results show that the nocturnal open cooling tower can alleviate the problem of soil heat accumulation, but the opening time determines the energy saving of the system, and when some temperature difference control is adopted for the opening of the night cooling tower, the problem of soil thermal accumulation can be further alleviated. The system is more energy efficient and runs at the lowest cost. The conclusion of this paper has certain reference value for the application of hybrid ground source heat pump system in practical engineering.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU831
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