【作者】 吕楠；

【导师】 陈振乾；

【作者基本信息】 东南大学 ， 供热、供燃气、通风及空调工程， 2016， 硕士

【摘要】 地表水源热泵系统是一种环保又节能的可再生能源利用技术,它将存储在地表水体中的太阳能作为冷热源,为建筑供冷供热。该系统的节能运行研究已成为当前的一大研究热点,本文在对地表水源热泵系统建模与仿真的基础上,分析其适宜的运行策略为实际工程提供技术支持。本文建立了地表水水体温度模型,求得水温分布解析解。从冷热源的角度分析可以看出,水源热泵系统相对于空气热泵的节能优势明显,在一般情况下水源热泵系统相对冷却塔系统也是节能的。根据能量方程对地表水源热泵系统的蒸发器、冷凝器、节流阀、压缩机、制冷剂、流体输配管路、变频水泵建立数学模型。通过在线参数检测对系统模型进行参数辨识,并对系统进行仿真模拟。以某开式水源热泵系统实例对仿真结果进行验证,其实际能耗值与模拟能耗值的一致性很高,最大相差7%。在此模型基础上,探讨源侧供回水温度、负荷率、冷凝器压力等参数对水源热泵系统性能的影响。以系统能效最高为优化目标,建立地表水源热泵系统的优化模型,得出各控制参数最优设定值。针对该优化模型,提出了一种基于最优源侧供回水温差的变流量运行的自适应模糊PID控制方法,控制模型的参数通过在线检测辨识的方法获得。通过模糊PID控制器实时调整水泵变频器频率,进而调节水泵的流量,以使得供回水温差等相关运行参数均处于最优设定值,以达到系统最优运行目的。此外以南京某地表水源热泵项目为例,分析适用于该项目的节能控制策略,包括加载或卸载机组策略和系统冬季运行优化策略,建立了水温预测模型和负荷预测模型。最后,对系统一工作日的控制策略进行分析,使系统得到了进一步的节能优化。更多还原

【Abstract】 The surface water source heat pump is an environmentally-friendly and energy-saving technology, which utilizes solar energy stored in the surface water as thermal source for cooling and heating requirement. Currently, the energy-saving operation research of the heat pump system has become a very hot topic. Based on the surface water source heat pump system modeling and simulation, analysis of its appropriate operation strategy in this paper provide technical support for the actual project.Surface water temperature model is presented in this paper, and analytic solution is obtained. The results show that water source heat pump has obvious advantage in enery-saving compared with the air source heat pump and is more efficient than the cooling tower system in the general case. Based on the energy equations,the mathematical models of surface water source heat pump system component are built including evaporator model,condenser model,throttle model,compressor model, refrigerant model,fluid transportation pipeline model,variable frequency pump model.Model parameters are identified via online parameters detection and the system simulation is verified by an actual open lake source heat pump system. The actual energy consumption value and simulate energy consumption are with high consistency. The maximum difference is 7%. Based on this model, this paper discusses the effect of the surface water temperature, return water temperature, load rate, condenser pressure on the performance of water source heat pump system.With the goal of highest system energy efficiency, the optimization model of the surface water source heat pump is established and the optimal set values of control parameters are obtained.Based on the optimization model, an adaptive fuzzy PID control method of variable flowrate operation is put forward. The parameters of the control model are adopted by online detection method.The fuzzy PID controller adjust pump inverter frequency in real time and regulate the water pump flowrate to keep real-time water temperature difference and other parameters at the optimal value,thus achieve the optimal operation.In addition, taking a regional energy station project in Nanjing as an example,the overall energy-saving operation control strategy of the surface water source heat pump system is put forward,including heat pump unit control logic,optimization operation strategy in winter,water temperature forecasting model and load forecasting model. Finally, a weekday control strategy of the system has been analyzed and the result show a good energy-saving effect.更多还原