动态负荷对土壤源热泵系统性能影响的研究

发布时间：2018-03-18 07:01

本文选题：地源热泵系统　切入点：动态负荷　出处：《太原理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：中国城市化和工业化的飞速发展以及人们对生活水平的高要求直接导致建筑能耗占总商品能耗比例的增加,能源供应越来越紧张,因此建筑节能已成为各行各业关注的热点。而建筑节能又应以调整建筑运行能耗、提高暖通行业能源利用率为重点。地源热泵技术作为暖通空调新技术,以可再生能源为冷热源,既节能又环保,被认为是最有发展潜力的节能技术之一。地下换热部分是地源热泵系统区别于传统空调系统的地方,地下换热器通过与土壤之间的热量交换达到调整室内热湿环境的目的。室内冷热负荷的动态变化导致地埋管换热器换热性能的动态变化,这种动态变化反过来又会影响到地源热泵机组的运行状况。因此室内末端、地源热泵机组及地埋管换热器之间能否合理正确的匹配关系到整个系统能否正常运行。本文以某收费站所使用的地源热泵系统为研究对象,通过输入建筑逐时动态负荷来分析其动态变化特性。首先,在建筑热环境模拟软件包DeST中建立模型,并模拟了全年逐时动态负荷；然后,考虑到地埋管换热器进出水管的不同换热状态,提出了沿深度方向的三区换热理论；利用该理论分析了动态负荷对地埋管换热器换热性能的影响；最后,使用多元线性回归法分析了地埋侧和负荷侧各参数之间的耦合关系,得到了耦合公式,并验证了公式的可靠性。为了更好的分析地埋管换热器的换热性能,在实验研究的基础上,应用FLUENT软件对单U型地埋管换热器的土壤温度场进行了三维数值模拟,结合实测温度数据对模型的可靠性进行了验证；接着对单U型管的换热性能的模拟结果进行了分析,同时还分析了进水温度和流量两个因素对换热性能的影响。
[Abstract]:The rapid development of urbanization and industrialization in China and people's high demand for living standards directly lead to the increase of building energy consumption as a proportion of total commodity energy consumption, and the energy supply is becoming increasingly tight. Therefore, building energy conservation has become a hot spot in various industries, and building energy saving should focus on adjusting building operation energy consumption and improving energy efficiency of HVAC industry. Ground source heat pump technology is a new HVAC technology. Taking renewable energy as the source of cold and heat, it is considered to be one of the most promising energy saving technologies. The underground heat transfer is the difference between the ground source heat pump system and the traditional air conditioning system. The heat exchange between underground heat exchanger and soil can adjust the indoor heat and humidity environment. The dynamic change of indoor heat and cold load leads to the dynamic change of heat transfer performance of underground heat exchanger. This dynamic change will, in turn, affect the operation of ground-source heat pump units. The reasonable and correct matching between ground source heat pump unit and ground buried tube heat exchanger is related to the normal operation of the whole system. In this paper, the ground source heat pump system used in a toll collection station is taken as the research object. The dynamic characteristics of buildings are analyzed by inputting hourly dynamic load. Firstly, the model is established in the building thermal environment simulation software package DeST, and the year-round hourly dynamic load is simulated. Considering the different heat transfer states of the inlet and outlet pipes of the underground tube heat exchanger, the three-zone heat transfer theory along the depth direction is put forward, and the influence of the dynamic load on the heat transfer performance of the ground buried tube heat exchanger is analyzed. The coupling relationship between the parameters of buried side and load side is analyzed by using multivariate linear regression method, and the coupling formula is obtained, and the reliability of the formula is verified. On the basis of experimental research, the soil temperature field of single U-type buried tube heat exchanger was simulated by FLUENT software, and the reliability of the model was verified with the measured temperature data. Then the simulation results of the heat transfer performance of single U tube are analyzed, and the influence of influent temperature and flow rate on the heat transfer performance is also analyzed.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

【参考文献】