依赖于既有工程经验数据或地埋管换热能力短期测试结果,采用粗放式方法进行中深层地埋管热泵系统源侧设计,导致地埋管系统容量配置不合理,影响热泵系统供暖的可靠性与经济性。为改善地埋管系统设计现状,采用动态仿真手段,同时虑及设计负荷、累计负荷、负荷逐时分布规律,分析长时间维度中深层地埋管地热资源非稳态特性和岩土温度自恢复特性,提出基于地下岩土“终态年度周期性冷热平衡”状态来确定地源侧设计供回水温度,进一步以地源侧全生命期年均成本最低进行最优化计算来确定源侧设计流量的设计方法,并将其应用于某工程项目,实现了地源侧参数的设计优化。
Abstract
Relying on the existing engineering experience data or the short-term heat transfer test results of middle and deep borehole heat exchanger, an extensive method is typically used to design the middle and deep borehole geothermal heat pump heating system. It leads to the unreasonable configuration of the borehole heat exchange system and the reduction of the reliability and economy of heat pump heating system. In order to improve the design status of the middle and deep borehole heat exchange system, a dynamic simulation method is adopted in this paper, considering the design load, cumulative load and hourly load distribution law, to analyze the unsteady characteristics of deep-buried geothermal resources in the long-term dimension and the temperature-self-recovery performance of rock and soil, and determine the designed water supply and return temperature at the source side based on the "annual periodic cooling and heat balance of final state" of underground rock and soil. And optimization method of source-side design flowrate based on the optimization of the average annual life-cycle cost on the ground source side is proposed. Taking an engineering project as an example, the optimization design of source-side parameter is given.
关键词
地热能 /
中深层同轴套管式地埋管换热器 /
长期换热性能 /
年度完全可再生状态 /
动态仿真
Key words
geothermal energy /
coaxial deep borehole heat exchanger /
long-term heat transfer performance /
annual fully renewable status /
dynamic simulation
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 徐伟, 李建峰, 魏庆芃, 等. 中深层地埋管地热热泵供暖关键技术研究与应用[J]. 建设科技, 2022(7): 45-47.
XU W, LI J F, WEI Q P, et al.Research and application of key heating technology of mid-deep geothermal heat pump system[J]. Construction science and technology, 2022(7): 45-47.
[2] 张哲菲, 刘洪涛, 刘攀峰, 等. 中深层地热地埋管实际运行影响因素研究[J]. 太阳能学报, 2022, 43(12): 503-509.
ZHANG Z F, LIU H T, LIU P F, et al.Study on actual operation and influencing factors of middle-deep geothermal buried pipe[J]. Acta energiae solaris sinica, 2022, 43(12): 503-509.
[3] DENG J W, HE S, WEI Q P, et al.Field test and optimization of heat pumps and water distribution systems in medium-depth geothermal heat pump systems[J]. Energy and buildings, 2020, 209: 109724.
[4] LI J, XU W, LI J F, et al.Heat extraction model and characteristics of coaxial deep borehole heat exchanger[J]. Renewable energy, 2021, 169: 738-751.
[5] SAPINSKA-SLIWA A, ROSEN M A, GONET A, et al.Deep borehole heat exchangers-a conceptual and comparative review[J]. International journal of air-conditioning and refrigeration, 2016, 24(1): 1630001.
[6] HUCHTEMANN K, MÜLLER D. Combined simulation of a deep ground source heat exchanger and an office building[J]. Building and environment, 2014, 73: 97-105.
[7] 刘俊, 张育平, 王沣浩, 等. 中深层套管式换热器可持续供热性能及优化设计研究[J]. 地球学报, 2023, 44(1): 230-238.
LIU J, ZHANG Y P, WANG F H, et al.Study on sustainable heating performance and optimization design of medium-deep coaxial heat exchanger[J]. Acta geoscientica sinica, 2023, 44(1): 230-238.
[8] 李鹏程. 中深层地热源热泵套管式地埋管换热器传热特性研究[D]. 哈尔滨: 哈尔滨工业大学, 2018.
LI P C.Research on heat transfer characteristics of casing ground heat exchanger with medium and deep ground source heat pump[D]. Harbin: Harbin Institute of Technology, 2018.
[9] 李思奇, 赵军, 李扬, 等. 闭式中深层井下换热数值模拟与内管分段绝热影响研究[J]. 太阳能学报, 2020, 41(11): 369-374.
LI S Q, ZHAO J, LI Y, et al.Numerical simulation of closed loop medium-deep downhole heat exchange: a focus on influence of segmented insulation on central pipe[J]. Acta energiae solaris sinica, 2020, 41(11): 369-374.
[10] 卜宪标, 冉运敏, 李华山, 等. 既有地热单井采暖系统换热量的增强方法[J]. 太阳能学报, 2020, 41(10): 369-374.
BU X B, RAN Y M, LI H S, et al.Enhancing heat transfer methods of existing geothermal single well heating system[J]. Acta energiae solaris sinica, 2020, 41(10): 369-374.
[11] 杜丁山, 赵永哲, 胡振阳, 等. 隔热内管对中深层地热井同轴换热器换热性能的影响[J]. 煤炭工程, 2023, 55(2): 164-170.
DU D S, ZHAO Y Z, HU Z Y, et al.Effect of insulated inner tube on performance of coaxial heat exchanger in medium-deep geothermal well[J]. Coal engineering, 2023, 55(2): 164-170.
[12] 陆耀庆. 实用供热空调设计手册[M]. 2版. 北京: 中国建筑工业出版社, 2008.
LU Y Q.Practical heating and air conditioning design manual[M]. 2nd ed. Beijing: China Architecture & Building Press, 2008.
[13] T/CECS 854—2021, 中深层地埋管地源热泵供暖技术规程[S]. 2021.
T/CECS 854—2021, Technical specification for middle and deep borehole geothermal heat pump heating system[S]. 2021.
基金
国家电网有限公司总部科技项目（5400-202132162A-0-0-00）
PDF(1655 KB)
