地源热泵系统长期运行模式对地温场影响(建筑热能终稿).pdfVIP

地源热泵系统长期运行模式对地温场影响 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 本文通过建立地源热泵管群传热模型，对全年供冷量大于、小于及等于供热量三 种情况在先夏季供冷后冬季供热与先冬季供热后夏季供冷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，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℃，对实际工程提供指导。 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 Long-running Mode on The Geothermal Field Zhang Lei, Qian Hua, Zheng Xiaohong, Zhang Xiaosong (School of Energy and Environment, Southeast University, Nanjing, 210096, China) Abstract ： A heat transfer model to calculate soil temperature to was developed. 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. 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 peri- phery tube from the center pipe 15 meters, its value of the former higher than the latter, the differ- ence is about 0.6 ° C. This result had guide meaning for the project. Key words: GSHP; pipes group; operating mode; soil temperature; numerical simulation 地埋管管群周围地温场对地源热泵系 大规模管群换热分析[3] 。并且，地源热泵系 统的运行有着重要的影响，但在地源热泵的 统的运行特性与系统所在地的土壤温度耦 实际工程应用中，土壤温度场监测方面的工 合受之影响，当设计不合理时，可能导致系 程实例仍然偏少，尤其缺乏长期的实际运行 统运行若干年后机组效率持续下降直至失 数据，这与我国地源热泵系统的高速推广发 去使用意义。因此，地温场的周期变化研究 展情况极不协调[1] 。我国地理环境南北差异 同样需要关注。 较大，在夏热冬暖地区，由于冷负荷大于热 影响地温场的因素主要是系统运行模 负荷，容易出现地下热量堆积从而使地埋管