一种模拟竖直地埋管换热器的热响应因子  

A Thermal Response Factor Simulating Vertical Ground Heat Exchanger of GCHP Systems

作　　者：陈友明[1] 潘冰冰 张训水[1] 杜次元[1] CHEN Youming;PAN Bingbing;ZHANG Xunshui;DU Ciyuan(College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2018年第9期138-144,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51378185)~~

摘　　要：为了快速并准确地计算钻孔群地下土壤和钻孔内流体的温度,在现有的模拟竖直埋管长期换热的模型基础上,提出了一种新的计算竖直地埋管钻孔域温度响应的响应因子——单位矩形脉冲热负荷作用下热响应函数(δ-函数).通过将δ-函数与快速傅里叶变换相结合来提高δ-函数的模拟速度,将该响应因子及算法与g-函数进行了精度和计算速度的对比.结果表明:该响应因子及算法不仅与g-函数有相同的计算精度,而且计算速度有显著的提高,当模拟5×8的钻孔群30a的温度响应时计算时间不到90s.To quickly and accurately compute the borehole fluid and ground temperature,a new thermal response factors(referred asδ-function)was proposed to calculate the ground temperature response of bore field to a unit rectangular heat pulse.The proposed model is based on the existing models for the longδ-term simulation of vertical heat exchanger.In this paper,theδ-function was combined with the fast Fourier transform to improve the computation speed of theδ-function.Then,the response factor and algorithm were compared with theδ-function in terms of accuracy and computation time.The results show that when combined with the fast Fourier transform,the g-function not only has the same precision with that of the g-function,but also has significantly faster computation speed than that of the g-function.It only spends shorter than 90 seconds to complete the 30 year hourly simulation of a 5×8 bore field.

关 键 词：竖直埋管换热器 单位矩形热脉冲 δ-函数 快速傅里叶变换 逐时模拟 

分 类 号：TK521.2[动力工程及工程热物理—热能工程]