【作者】 庄兆意；

【导师】 孙德兴；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气、通风及空调工程， 2007， 硕士

【摘要】 随着可持续发展战略中环保和节能这两大主题的不断深入,各种低温热源,诸如地下水、土壤、太阳能、余热、废热、城市污水等不断加入到城市热源的行列中来,尤其是城市污水更是显示出了强劲的发展潜力。污水源热泵系统换热工况的选择是系统设计的关键,这些参数的选择,必须在保证系统正常使用效果的同时,还必须满足经济性要求,包括初投资和运行费用两方面。本文对污水源热泵系统实际工程中冬季的运行参数进行了检测。根据实际测量的相关数据,分析了一、二级污水泵的匹配对污水防阻机性能的影响,污水进口温度、进出口温差对系统性能的影响,水泵能耗在系统总能耗中的比例。并据此给出了系统中一、二级污水泵的选择原则和依据,系统运行时的调试方法,为污水源热泵系统的工程设计、运行提供理论依据。以动态的年计算费用为目标函数,以污水源热泵系统各环路的设计参数为优化参数,分别推导了系统的初投资和运行费用的优化目标函数,根据实际工程运行中的测试数据完善了优化过程中的约束条件,编制MATLAB程序来对系统设计参数进行优化,并结合实际算例给出了系统参数设计值,分析了个别参数变化时对系统年计算费用和系统机组性能的影响。在系统环路最优化设计参数确定的基础上介绍了污水—中介水换热器的设计方法和原则,结合实际工程例子给出了换热器的设计步骤和方法,并在有限时间热力学理论基础上建立了系统的换热面积和机组性能的数学模型,结合实际算例给出了系统换热面积的优化设计。更多还原

【Abstract】 With the fact that environmental protection and energy saving of sustainable development deeply increased, various low-temperature heat source brought into city heat source, such as underground water, solar, soil energy, excess heat, waste heat and urban sewage; especially, the urban sewage has strong developmental potential ability. The key of system design is the selection of heat transfer working condition of sewage heat pump system. The selection of these parameters is supposed to be assure the effect of system, and simultaneous satisfy the economical efficiency, including first cost and operating cost.The paper has tested the winter operation parameter of sewage heat pump system in a real project; according to the relevance data that practice measuring, the effect of matching between one-stage and two-stages pumps to clog proof machine has analyzed; and also the impact of the entrance temperature and entrance temperature difference to system function, the proportion of pump energy consumption in general energy consumption of system have been shown in the paper. Based on these analyses the selection principle and basis have been given. The system setting method provides the theory basis of sewage heat pump system engineering design and operation administration.Taking the dynamic year calculates cost as target function, and design parameters of every circle pipe in sewage heat pump system as optimize parameters, first invest and operating cost optimization target function of system have been deduced. According to testing data in actual project constraint condition in optimizing process is perfect. MATLAB procedure has been worked out to optimize the system design parameter. Combination with an example the system design parameters have been given; and also the effect of individual parameters to system year cost and system unit performance is analyzed.Based on the determination of circle pipes optimization parameters and combination with an actual project, the design procedures and principle of design the sewage-clear water heat exchanger have been introduced. The mathematic model of system heat transfer area and unit performance have been established based on finite-time thermodynamics theory, and the specific optimization design has been shown combination with an actual project.更多还原