江水源热泵取水系统特性研究与优化选型分析

发布时间：2018-04-03 16:45

本文选题：江水源热泵　切入点：时间序列分析　出处：《重庆大学》2014年硕士论文

【摘要】：取水系统是江水源热泵系统的重要组成部分，取水的可靠性是江水源热泵系统稳定运行的重要保障，占江水源热泵系统初投资及能耗比例较高的取水系统的优化设计及优化运行也关系到江水源热泵系统的经济性，因此具有安全性和经济性的重要意义。取水系统包括水源、取水管路、取水泵、热泵机组、水处理设备等组成部分，本文从江水源热泵系统应用的角度研究江水水源的水位、水温的特性，取水泵及热泵机组的变工况的能耗特性，在此基础上，从取水泵与热泵机组运行能耗的角度对取水系统中的取水泵进行优化选型的研究。本文的研究主要进行了下列几个方面的工作： 1）对长江重庆段的江水水温与水位时间序列进行了分析，建立的模型适用于水源水位等数据缺失的情况下的补插或进行短期预测。 2）利用时间序列分析方法中的X-11过程对长江重庆段的水源水位、水温序列的趋势因素、季节因素及不规则因素进行了提取及研究，，揭示其月度序列的特征及基本趋势。针对江水源热泵系统中制冷及制热工况的时间分布及系统运行特点，分别计算了制冷季和制热季时段内的水位资料的频率分布，得出了江水逐日水位经验频率曲线及相关水位分布频率统计数据。 3）综合分析取水系统中的取水泵变频工况下，变频器、配套电机、取水泵的性能变化情况，建立了取水泵在定频及变频工况下的能耗模型。总结研究以往的水源热泵机组能效模型，提出应该综合考虑制冷剂回路、压缩机的组合情况对机组能效的影响，根据各制冷剂回路或压缩机运行的组合情况，对机组在不同负荷率范围内的性能进行分段拟合，并在不同的运行条件下分别考虑水温、水量等因素对机组能效的影响，可以有效的提高拟合精度。 4）依据实际项目的热泵机组配置及系统负荷的分布情况，结合水源水位、水温的概率分布，描述了取水泵的运行工况范围。根据水泵的优化选型原则，利用江水源热泵系统的取水系统能耗模型，编制计算程序，分析各工况点的运行情况，并通过实际算例对该程序的有效性进行了验证。
[Abstract]:The water intake system is an important part of the river water source heat pump system, and the reliability of the water intake system is an important guarantee for the steady operation of the river water source heat pump system.The optimal design and operation of the water intake system, which accounts for the initial investment and high energy consumption of the river water source heat pump system, is also related to the economy of the river water source heat pump system, so it is of great significance for the safety and economy of the water source heat pump system.The water intake system includes water source, water intake pipeline, pumping pump, heat pump unit, water treatment equipment and so on. This paper studies the characteristics of water level and water temperature of river water source from the point of view of the application of river water source heat pump system.On the basis of the energy consumption characteristics of water pump and heat pump unit under different operating conditions, the optimal selection of water intake pump in water intake system is studied from the angle of energy consumption of pump and heat pump unit.The main work of this paper is as follows:1) the time series of water temperature and water level in Chongqing section of Yangtze River are analyzed, and the established model is suitable for interpolation or short-term prediction in the absence of water level and other data.2) using the X-11 process in the time series analysis method, the trend factors of water level, water temperature, seasonal factors and irregular factors in the Chongqing section of the Yangtze River are extracted and studied, and the characteristics and basic trends of the monthly series are revealed.According to the time distribution of refrigeration and heating conditions and the characteristics of system operation in river water source heat pump system, the frequency distribution of water level data in refrigeration season and heating season are calculated respectively.The empirical frequency curve of daily water level and the statistical data of relative water level distribution frequency are obtained.3) the energy consumption model of the pump in the fixed frequency and frequency conversion condition is established by synthetically analyzing the performance changes of the pump in the frequency conversion condition, the frequency converter, the matching motor and the pump in the water intake system.The energy efficiency model of water source heat pump unit is summarized and studied. It is suggested that the refrigerant loop and the effect of compressor combination on unit energy efficiency should be considered synthetically, according to the combination of each refrigerant loop or compressor,The performance of the unit in the range of different load rates is fitted by stages, and the effect of water temperature and water quantity on the efficiency of the unit is considered under different operating conditions, which can effectively improve the fitting accuracy.4) according to the configuration of heat pump unit and the distribution of system load, combined with the probability distribution of water level and water temperature, the operating condition range of the pump is described.According to the principle of optimal selection of water pump, using the energy consumption model of water intake system of river water source heat pump system, the calculation program is compiled, and the operating conditions of each working point are analyzed, and the validity of the program is verified by practical examples.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU83

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