【作者】 李锋；

【导师】 田喆；

【作者基本信息】 天津大学 ， 供热、供燃气、通风及空调工程， 2012， 硕士

【摘要】 建筑节能是当今社会研究的热点，合理利用可再生能源是降低建筑能耗的主要途径。利用热泵机组回收废热在保护环境的同时还可以大幅降低能源消耗，热泵供热系统被认为是传统供热系统的替代者。由于热泵机组出水温度较低，热泵机组必须与常规供热设备进行复合才能满足散热器供热系统供暖参数的需求。复合能源供热系统中热泵机组承担基础热负荷，常规供热设备负责调峰和调节供水温度。为提升系统能源利用效率，建议热泵机组和常规能源设备之间采用串联模式。复合能源供热系统能源利用效率主要受供水温度的影响，散热器散热特性和建筑热负荷特性表明系统供水温度是室外温度的函数，通过调节供水参数、优化运行控制策略可以大幅提升复合能源供热系统的能源利用效率。为给复合能源供热系统的科学运行提供指导，有必要对复合能源供热系统的运行策略进行深入研究。首先，建立不同室外温度下供热参数的预测模型；其次，建立系统优化控制方法及评价方法；最后，对某一复合能源供热系统案例的最优运行控制策略进行研究。首先，对某一散热器采暖系统的供热参数进行测试，基于现有的测试数据分析供热参数随时外气象参数的变化规律。研究表明，散热器表面平均温度与室外温度呈线性关系，这为供热系统变室外温度下供热参数的预测提供了理论依据。其次，基于本文所研究的复合能源供热系统，分别建立燃气锅炉、热泵机组和水泵的能耗计算模型。根据上述计算模型来确定系统的优化设计与优化控制方法，通过对比复合能源供热系统与传统燃煤锅炉供热系统来建立复合能源供热系统评价模型。最后，对西安市某复合能源供热系统的运行控制策略进行分析研究，首先利用Trnsys模拟建筑热负荷，分析计算系统热负荷随室外温度的变化规律。然后确定系统中各能耗设备的计算模型，进而确定系统优化控制方程。最后基于系统优化控制方程确定系统在不同工况下的最佳运行策略，并从经济性、节能性和碳减排三个方面来评价该系统的优劣。更多还原

【Abstract】 Building efficiency is a social topic issue, rational utilize of the renewable energy isone way to reduce the energy consumption of buildings. Using heat pump to recoverwaste heat is of great significance in energy saving and environmental protection, heatpump heating system is now considered a viable alternative to conventional heatingsystem. For the outlet water temperature of the heat pump is lower than therequirement of radiators, heat pump must be coupled with conventional heatingequipment.In the hybrid heating system, heat pumps are adopted to afford the basic heatingload of the system, conventional heating equipments are deployed for peak loadcompensation and regulating the supply water temperature. In order to improve theenergy efficiency of the system, the cascade mode is suggested between heat pumpsand conventional heating equipments. The energy efficiency of the hybrid heatingsystem is affected by the supply water temperature, and the supply water temperatureis the function of the outdoor temperature. Therefore, the energy efficiency of thehybrid heating system can be improved by regulating supply water parameters and theoptimal operation strategy.In order to provide reference for scientific operation of the hybrid heating system, itis necessary to research into the operation strategy of the hybrid heating system.Firstly, the forecast modal of the heating parameters in different outdoor temperatureswas established. Secondly, the performance model of the system and the evaluationmethodology of the hybrid heating system were established. Finally, the operationstrategy of a hybrid heating system was analyzed.Firstly, a test was conducted on a radiator heating system, the relationship betweenheating parameters and outdoor temperature were analyzed. The results indicated thatthere is a linear relationship between the average temperature of the radiator andoutdoor temperature, which provide the theoretical basis to forecast the heatingparameters in different outdoor temperatures.Secondly, on the basis of the hybrid heating system studied in this paper, theperformance models of the system components, including heat pump, gas boiler andwater pump were established respectively. Then, the performance model of the system was established on the basis of the performance models of the system components,and the evaluation methodology was studied on the basis of the contrast betweenhybrid heating system and conventional coal-fired boiler heating system.Finally, the operation strategy analysis for a hybrid heating system in Xi’an wasperformed. First of all, the heating load of the buildings was simulated by Trnsys, andthe relationship between heating load and outdoor temperature was obtained. Then,the computation modal of each equipment was established, and the optimal controlfunction of the system was determined. At last, the operation strategy of the hybridheating system in different outdoor temperatures were obtained, and the advantagesand disadvantages of the hybrid heating system was evaluated in economicalefficiency, energy saving and carbon emission reduction.更多还原