西安地区岩土综合热物性参数分析及土壤源热泵经济适宜区研究

发布时间：2018-02-21 09:41

  本文关键词： 土壤源热泵 水文地质 浅层地温 岩土热物性 能耗 工程经济效益　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：建筑中的能源消耗占据我国能源总消耗的很大比例，而暖通空调又是建筑能耗中最大的因素。随着资源紧缺和环境污染的问题日益加剧，浅层地热能越来越受建筑设计人员和科研人员的高度关注。土壤源热泵正是一种利用浅层地热能的新型高效空调系统，在国家政策的鼓励下，近年来得到快速发展。 由于土壤源热泵系统综合性能主要受地埋管浅层岩土换热性能的影响，即受岩土热物性参数的影响。因此本文提出依据岩土的热物性来对土壤源热泵进行适宜区的划分。 本文以西安市主城区及周边为研究区域，结合地质、水文地质条件勘察数据，选取代表性点进行岩土热响应试验，分析研究区域地下水位埋深和岩土热物特性等因素对地埋管换热性能及土壤源热泵系统应用的影响。以经济效益与社会效益的角度，通过与常规空调系统对比分析，，将西安市地区不同地貌单元浅层岩土热物性参数对土壤源热泵应用的适宜性做出分析。 通过试验与分析得出以下结论：西安市主城区及周边的潜水水位范围为360m～550m（海拔值），沿东南至西北方向水位递减。黄土塬地貌区域包气带厚度为30m～60m。其它区域包气带厚度基本为2m～30m。地下120m内，岩土综合导热系数的范围是1.551W/(m K）～2.0W/(m K），容积比热容的范围是2.255×106J/(m3℃）～2.709×106J/(m3℃）。研究区域恒温层至地下120m内岩土的平均温度范围是16℃～18℃。 通过年运行能耗值计算比较及经济性比较，得出西安市主城区及周边各个地貌单元中，土壤源热泵空调系统比常规冷热源空调系统的节能效果明显，经济效益显著。综合社会效益和工程经济效益，对研究区域土壤源热泵空调系统应用的适宜性做分析，按照地貌单元对研究区域土壤源热泵空调系统适宜性做出排序。 本课题的研究旨在对当地地埋管热泵系统的开发利用进行适宜性评价,为西安市主城区及周边地源热泵健康发展提供帮助。为土壤源热泵系统的设计提供参考。
[Abstract]:Energy consumption in buildings accounts for a large proportion of the total energy consumption in China, and HVAC is the biggest factor in building energy consumption. Ground source heat pump (GSHP) is a new type of high efficient air conditioning system using shallow geothermal energy, which has been developed rapidly in recent years under the encouragement of national policies. Because the comprehensive performance of ground-source heat pump system is mainly affected by the heat transfer performance of shallow rock and soil of buried pipe, that is, by the parameters of geotechnical thermal property, this paper proposes to divide the suitable area of ground-source heat pump according to the thermophysical property of geotechnical. In this paper, taking the main urban area of Xi'an city and its surrounding area as the study area, combined with the geological and hydrogeological condition survey data, the representative points are selected to carry out the geotechnical thermal response test. This paper analyzes the influence of the factors such as the buried depth of regional groundwater level and the characteristics of geotechnical heat objects on the heat transfer performance of buried pipes and the application of ground-source heat pump system. From the point of view of economic and social benefits, it is compared with the conventional air conditioning system. The suitability of the thermal properties of shallow rock and soil in different geomorphologic units to the application of ground-source heat pump in Xi'an area was analyzed. Through test and analysis, the following conclusions are drawn: the range of diving water level in the main urban area of Xi'an city and its surrounding area is 360 m ~ 550 m (elevation value), which decreases along the southeast to northwest direction. The thickness of aeration zone in loess tableland is 30 m ~ 60 m. The thickness of the belt is about 2 m ~ 30 m. Within 120 m underground, The comprehensive thermal conductivity of rock and soil is 1.551 W / m ~ (-1) K ~ (-1) 2.0 W / m ~ (-1) K ~ (-1), and the range of volume specific heat capacity is 2.255 脳 10 ~ (6) J / m ~ (3) 鈩

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