【作者】 郭晓东；

【导师】 舒海文；

【作者基本信息】 大连理工大学 ， 建筑与土木工程（专业学位）， 2018， 硕士

【摘要】 近年来我国城镇化高速发展,快速城镇化带动建筑业持续发展,我国建筑业规模不断扩大,建筑面积大幅增加,随之带来大量的能源消耗,而建筑能耗中北方城镇供暖系统的能耗强度一直较大,如何节约北方城镇供暖所用能源,如何提高可再生能源在北方城镇供暖中的使用比例一直是国内学者的研究重点。太阳能-水源热泵供暖系统作为一种利用可再生能源供暖的系统,越来越受到关注。如何提高太阳能-水源热泵的供暖效率成为众多学者关注的焦点。文章首先利用TRNSYS软件建立了短期蓄热太阳能辅助水源热泵供暖系统的仿真模型,并根据辽宁阜新市的工程实测记录数据对该模型进行了验证。其次,对短期蓄热太阳能-水源热泵系统中蓄热水箱热水利用方式不同的太阳能直接供暖模式、太阳能间接加热源侧水的热泵供暖模式、太阳能串联热泵供暖模式和水源热泵单独供暖模式的能效进行分析,以提升太阳能直接供暖模式运行时长来减少热泵机组运行时长为目标对太阳能辅助水源热泵供暖系统的运行策略提出了改进的方法,使用太阳能辅助水源热泵供暖系统的仿真模型对运行策略在不同太阳能资源水平地区的典型城市的改进效果进行了模拟分析,发现系统使用改进后的运行策略,供暖期内的平均能效比可提升3.5%~43.58%,且改进后的运行策略对系统能效的提升效果随当地太阳能资源水平的提高而提高。对改进后运行策略中的关键参数:热水强制利用时刻进行优选后发现,在不同太阳能资源水平地区此参数的最优值有所不同,我国太阳能资源丰富区为17点,较丰富区为16点,资源一般区为15点。然后,综合考虑太阳能辐照量、建筑供暖设计负荷、供暖系统设计供水温度和水源温度状况,针对短期蓄热太阳能辅助水源热泵供暖系统蓄热水箱的容积提出了一种设计方法,以便充分配合系统改进后的运行策略充分利用太阳能热水直接供暖同时又避免水箱容积过小而影响系统稳定性。作者采用短期蓄热太阳能辅助水源热泵供暖系统的仿真模型对不同太阳能资源水平地区的典型城市的供暖实例进行模拟计算。与按《太阳能供热采暖工程技术规范》(GB50495)中的方法所确定的蓄热水箱容积进行比较,发现按本文提出的方法确定水箱容积,系统在供暖期内的平均能效比最高可提升7.76%~14.39%。将太阳能辅助水源热泵供暖系统的运行策略和蓄热水箱的容积按照本文所提出的方法改进后,系统能效可提升13.67%~60.57%。最后,对太阳能辅助水源热泵供暖系统的经济性和节能环保性效益进行分析。对比了水源热泵供暖系统和燃气锅炉供暖系统,发现过高的初投资制约了太阳能辅助水源热泵系统的经济性。同时太阳能辅助水源热泵供暖系统在减少常规能源消耗和碳排放方面有显著的效果。更多还原

【Abstract】 In recent years,China’s urbanization has developed rapidly,and rapid urbanization has driven the sustainable development of the construction industry.The scale of China’s construction industry has continuously expanded,and the construction area has increased substantially.This has led to a large amount of energy consumption,and the energy consumption of heating systems in northern cities in building energy consumption.The intensity has been relatively large,how to save the energy used by heating in northern towns,and how to increase the proportion of renewable energy in heating in northern towns has always been the focus of domestic scholars.Solar-water source heat pump space heating systems are attracting more and more attention as a system for heating using renewable energy.How to increase the heating efficiency of solar-water source heat pump has become the focus of many scholars.First a simulation model of the solar assisted water source heat pump space heating system with multiple operating modes is established using TRNSYS software.And the simulation model is validated by the operating data of a similar projects in Liaoning Fuxin.Secondly the efficiency of the four operation modes are analyzed,An improved operation strategy was proposed for the solar-assisted water source heat pump space heating system.The simulation model of the solar-assisted water source heat pump space heating system was used to analyze the optimization of the operation strategy in different regions,and the average COP of the system during heating period can be increased by 5.86% to 43.89%.As the level of local solar energy resources increases,the operation strategy’s improving effect on the system decrease.The best value of the key parameters of the improved operation strategy: hot water activation time is found.Then a method to design the volume of the heat storage tank of the solar assisted watersource heat pump space heating system is presented.The space heating load and the solar radiation are considered simultaneously in this method.In order to show the advantage of this design method,TRNSYS software was used to simulate the same solar assisted water-source heat pump space heating system case project with the volume of the heat storage tank designed by both the method brought out in the paper and the one described in the China national design code.Performances of the average system COP of the system designed by the two different methods are investigated and the results show that the solar assisted water-source heat pump space heating system with the heat storage tank volume designed by the method presented in the paper can be increased by 5.7% to 14.4%.Finally,the economical and energy-saving and environmental-friendly benefits of the solar-assisted water-source heat pump heating system are analyzed.Analyzed the initial investment,operating costs and annual cost of the system,compared the water source heat pump heating system and the gas boiler heating system,and it is finally proved that the solar-assisted water-source heat pump heating system has good economic prospects and has a good environmental protection benefit.更多还原