跨季节蓄热太阳能—地源复合热泵系统优化及应用研究

发布时间：2018-04-13 09:41

本文选题：地源热泵 + 供暖　；参考：《河北工程大学》2017年硕士论文

【摘要】：随着我国城镇化的不断推进,北方供暖地区的集中供暖面积缺口逐渐扩大,同时,大量孤立建筑物及广大农村地区也亟需环保高效的供热方式来替代常规燃煤或直接电加热的供暖方式,地源热泵作为我国为数不多可供选择的良好供热方式之一,在全年累积热负荷远大于全年累积冷负荷的地区运用时,存在着岩土体热失衡的问题。跨季节蓄热太阳能-地源复合热泵系统的合理应用可以很好的解决地源热泵累年运行导致的岩土体热失衡问题,但是目前对于该系统的研究还不全面,不能良好的支撑系统的推广与应用。本文以现有跨季节蓄热太阳能-地源复合热泵系统研究为起点,找出其中仍需进一步研究的部分作为本文的研究重点。随后以北京大兴西芦某公共建筑示范项目系统为原型,进行正交模拟实验研究,得出了太阳能集热器装机容量、岩土体的初始温度、岩土体综合导热系数、岩土体容积比热容和地埋管换热器间距五个参数对于岩土体蓄热达到平衡时温度场平均温度的影响。研究表明,太阳能集热器装机量和岩土体初始温度对于最终岩土体温度场的影响具有高显著性且影响趋势较为相似,均存在一个拐点,拐点处后因素对于岩土体温度场的影响显著程度逐渐降低;岩土体综合导热系数与岩土体容积比热容对于岩土体最终温度场的影响具有高显著性,且两者在常见的范围内存在互补性;地埋管换热器间距对岩土体最终蓄热温度无显著影响。为了验证系统的优越性并佐证模拟的可靠性,本文对北京大兴西芦某公共建筑示范项目和无煤示范村跨季节蓄热太阳能-地源复合热泵系统进行了实验研究,实验研究结果与对应的模拟部分保持了一定的相符度,同时,也验证了系统蓄热部分耗电量较少;蓄热对系统夏季供冷影响可控;系统供暖的高效性、舒适性;系统相较常规地源热泵具有经济性。最后,为解决跨季节蓄热太阳能-地源复合热泵系统推广应用时的适宜性问题,本章根据系统的特点,架构出一套实用的体系从房屋冷热负荷特征评价项、太阳能集热器空间保证率评价项、节能性评价项、经济性评价项、年辐射总量评价项和热工分区评价项6个必要评价项来对跨季节蓄热太阳能-地源复合热泵系统运用的适宜性进行判定,得出适宜使用该系统的具体判定指标,从而为系统的推广提供便利。
[Abstract]:With the continuous development of urbanization in our country, the gap of central heating area in northern heating areas is gradually widening, and at the same time,A large number of isolated buildings and rural areas also need environmental protection and efficient heating to replace conventional coal-fired or direct electric heating. Ground source heat pump is one of the few good heating methods available in China.When the annual accumulated heat load is much larger than the whole year's accumulated cooling load, there is a problem of thermal imbalance in geotechnical body.The rational application of cross-season solar and ground-source heat pump system can solve the problem of geotechnical heat imbalance caused by the annual operation of ground-source heat pump, but the research on the system is not comprehensive.Not good support system promotion and application.In this paper, the existing cross-seasonal solar and ground source heat pump system is taken as the starting point, and some of the parts that need further research are selected as the focus of this paper.Then taking the demonstration project system of a public building in Daxing Xilu, Beijing as the prototype, the orthogonal simulation experiment was carried out, and the installed capacity of solar collector, the initial temperature of rock and soil, and the comprehensive thermal conductivity of rock and soil were obtained.The influence of five parameters of volumetric specific heat capacity of rock and soil and distance between ground heat exchangers on the average temperature of temperature field when the heat storage of rock and soil reaches equilibrium.The results show that the influence of solar collector installed quantity and initial temperature of rock and soil on the final temperature field of rock and soil is highly significant and the influence trend is similar and there is an inflection point.The influence of the factors at the inflection point on the temperature field of rock and soil gradually decreases, and the influence of the comprehensive thermal conductivity of rock and soil and the specific heat capacity of rock and soil on the final temperature field of rock and soil is highly significant.The distance between ground heat exchangers has no significant effect on the final heat storage temperature of rock and soil.In order to verify the superiority of the system and to prove the reliability of the simulation, a demonstration project of a public building in Xilu, Daxing, Beijing, and a cross-season solar and ground-source heat pump system for cross-season heat storage in a coal-free demonstration village were studied experimentally.The experimental results are consistent with the corresponding simulation part, and also verify that the heat storage part of the system consumes less electricity, the influence of heat storage on the system cooling in summer is controllable, the efficiency and comfort of the system heating is high.The system is more economical than conventional ground source heat pump.Finally, in order to solve the problem of suitability in the popularization and application of cross-season regenerative solar-ground source heat pump system, according to the characteristics of the system, this chapter constructs a set of practical system to evaluate the characteristics of house cooling and heat load.Solar collector space guarantee rate evaluation item, energy conservation evaluation item, economic evaluation item,In order to judge the suitability of cross-season solar energy / ground source heat pump system, six necessary evaluation items of annual total radiation quantity and thermal zone evaluation item are obtained, and the specific judgment indexes are obtained for the suitable use of the system.Thus, it is convenient for the popularization of the system.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83

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