夏热冬冷地区地源热泵技术的应用研究

发布时间：2018-04-04 03:49

  本文选题：地源热泵　切入点：动态负荷　出处：《南京理工大学》2013年硕士论文

【摘要】：夏热冬冷地区的主要气候特点为夏季炎热,冬季寒冷,湿度大,因此该地区的建筑及其负荷特点不同于其他气候区域。本文以AT值作为第一划分参数对夏热冬冷地区的建筑节能季节进行了划分,用DEST软件对夏热冬冷地区的酒店、办公、住宅类建筑进行了全年逐时能耗模拟,从负荷总量的累积效应、负荷强度的变化特性、负荷的持续性这三个角度描述了夏热冬冷地区建筑的动态负荷特性。 本文将地源热泵机组的进、出口水温及建筑逐时负荷拟合成公式,通过编辑UDF程序控制FLUENT软件模拟地源热泵系统的运行,基于动态负荷对U型地埋管换热器与当量直径地埋管换热器的传热模型进行了对比,得出：地源热泵系统全年运行,不同地下水渗流条件下,在供冷期和供暖期,U型地埋管与当量直径地埋管土壤平均温度的最大偏差为0.4℃；供冷期,地埋管逐时出水温度偏差的平均值为0.47℃,供暖期,地埋管逐时出水温度偏差的平均值为0.53℃。 地埋管换热器的换热特性直接影响到地源热泵机组的运行性能,本文建立了地埋管管群换热器的实际传热模型,模拟了地下水流动对地源热泵系统运行性能的影响,通过分析得出：渗流有利于地源热泵系统的长期运行,当地下水的渗流速度等于31.5m/a时,上海市酒店类建筑地源热泵系统地埋管的年逐时出水温度大致相同。 本文选取了南京、武汉、长沙、重庆作为夏热冬冷地区的典型代表性城市,结合这四座城市不同功能建筑的负荷特性对地源热泵在夏热冬冷地区的长期运行性能进行了分析,得出了以下三点结论：负荷总量累积效应越明显,土壤的温度越高、蓄热量越大；负荷的持续性越强,土壤温度的分布越不均匀；负荷的强度变化越大,供冷期地埋管的最高出水温度越高,供暖期地埋管的最低出水温度越低。
[Abstract]:The main climatic characteristics of hot summer and cold winter are hot summer, cold winter and high humidity. Therefore, the characteristics of buildings and their loads in this area are different from other climatic regions.This paper uses AT value as the first division parameter to divide the energy saving seasons of buildings in hot summer and cold winter area, and simulates the hourly energy consumption of hotel, office and residential buildings in hot summer and cold winter area with DEST software.The dynamic load characteristics of buildings in hot summer and cold winter area are described from three aspects: cumulative effect of total load, variation of load intensity and continuity of load.In this paper, the inlet and outlet water temperature of ground-source heat pump unit and the quasi-composite formula of building hourly load are used to simulate the operation of ground-source heat pump system by editing UDF program to control the operation of ground-source heat pump system.Based on the dynamic load, the heat transfer models of U-type ground heat exchanger and equivalent diameter ground heat exchanger are compared. It is concluded that the ground source heat pump system runs all year round and under different groundwater seepage conditions.The maximum deviation of soil average temperature between U-type buried pipe and equivalent diameter buried pipe is 0.4 鈩，

本文编号：1708238