地源热泵系统跨季运行方式对土壤温度分布影响.pdf

2012 东南大学校庆研究生学术报告会 地源热泵系统跨季运行方式对土壤温度分布影响 张磊 钱华 郑晓红 张小松 （东南大学能源与环境学院南京 210096） 摘 要：地埋管管群周围地温场对地源热泵系统的运行效率有着重要的影响。本文通过建立地源热泵管群传热模型，利用数 值分析方法，对全年供冷量大于、小于及等于供热量三种情况在夏季供冷后冬季供热与先冬季供热后夏季供冷不同运行模式 下地温场的变化及其对系统运行效率的影响分别进行研究。结果表明：全年供冷量大于供热量时，运行模式分别为先夏季供 冷后冬季供热与先冬季供热后夏季供冷，至10 年运行结束时，前者中心埋管处温升低于后者，差值约为1.5℃；管群外围距 中心埋管15 米处温度值，前者高于后者，差值约为0.6℃。研究结果对于地源热泵系统设计及长久运行具有一定的工程指导 意义。 关键词：地源热泵；管群；运行模式；地温场；数值模拟 Influence of The GSHP System by seasonal Mode on The Geothermal Field Zhang Lei ，Qian Hua ，Zheng Xiaohong ，Zhang Xiaosong (School of Energy and Environment, Southeast University, Nanjing, 210096, China) Abstract ：The soil temperature around the underground pipes influences the operating performance of ground source heat pump system obviously. A heat transfer model to calculate soil temperature to was developed to study long term variation of soil temperature at different running modes. Three running modes to effect soil temperature were calculated and compared, i.e. annual cooling loads greater than, less than and equal to heating loads. The initial conditions to influence the soil temperature distribution were also studied, running ground source heat pump from Summer, Winter. Results showed that when the annual cooling loads is greater than the heating loads, then set up two kinds of operation modes. The first mode is that first operate summer cooling, then the winter heating, the other mode is that first operate winter heating, then the summer cooling . To the end of the 10-year running, the former temperature of the center pipe lower than the latter, the difference is about 1.5 °C. The temperature of the periphery tube from the center pipe 15 meters, its value of the former higher than the latter, the difference is abo