安全与环境工程2025，Vol.32Issue(4)：12-23,12.DOI:10.13578/j.cnki.issn.1671-1556.20240993
干热岩裂隙对流换热系数计算新方法
New method for calculating convective heat transfer coefficient in hot dry rock fractures
摘要
Abstract
In the exploitation of hot dry rock(HDR)geothermal resources,the overall heat transfer coefficient(OHTC)serves as a critical parameter for evaluating the thermal exchange performance of fractured fluids.Existing calculation methods predominantly rely on assumptions and simplifications of the temperature distribution along fracture surfaces;however,a standardized framework for assessing the accuracy and objectivity of these formulations has yet to be established.This study aims to develop a more rigorous computational approach for determining the OHTC and to systematically evaluate existing mainstream formulas.To achieve this,high-resolution numerical modeling was employed to directly extract temperature distribution data across fracture surfaces.A novel OHTC calculation method(Formula E)was proposed,accompanied by an empirical correlation(Formula F).The performance of all formulations(A～F)was quantitatively assessed based on numerical simulations and experimental validation.Furthermore,Formula F was integrated into a numerical simulation framework to conduct field-scale thermal exchange simulations,thereby validating its robustness under realistic conditions.The results demonstrate that both Formula E and Formula F exhibit superior computational accuracy and broad applicability.Notably,existing Formulas A and D,along with the newly derived Formulas E and F,exhibit consistent trends across all operational scenarios,with minimal deviation and no anomalous values,showing excellent stability and reliability.As an independent supplementary correlation,Formula F can be seamlessly embedded into numerical simulators,enabling efficient and accurate modeling of large-scale fluid heat transfer processes.关键词
换热系数/干热岩/数值模拟/裂隙Key words
heat transfer coefficient(HTC)/hot dry rock(HDR)/numerical simulation/fracture分类
资源环境引用本文复制引用
郑志伟,刘先珊,白冰,雷宏武,张天成,于明智,孙梦,黄子宣..干热岩裂隙对流换热系数计算新方法[J].安全与环境工程,2025,32(4):12-23,12.基金项目
国家重点研发计划项目(2022YFE0128300) （2022YFE0128300）
国家自然科学基金项目(41972316,52279094) （41972316,52279094）
重庆市自然科学基金项目(CSTB2023NSCQ-MSX0069) （CSTB2023NSCQ-MSX0069）
