竖进平出型地埋管群换热器结构与控制优化

doi:10.12096/j.2096-4528.pgt.22111

发电技术 ›› 2024, Vol. 45 ›› Issue (3): 478-485.DOI: 10.12096/j.2096-4528.pgt.22111

竖进平出型地埋管群换热器结构与控制优化

马培发¹^,², 张杰¹^,²^,³, 于春雨¹^,³, 汪浩瀚²

^1.西南石油大学机电工程学院，四川省成都市 610500
^2.西南石油大学地热能研究中心，四川省成都市 610500
^3.石油天然气装备技术四川省科技资源共享服务平台，四川省成都市 610500

收稿日期:2023-07-23 修回日期:2023-10-09 出版日期:2024-06-30 发布日期:2024-07-01
通讯作者: 张杰
作者简介:马培发(1997)，男，硕士研究生，主要研究方向为地热能开发与利用，2471504231@qq.com；
张杰(1987)，男，博士，教授，主要研究方向为清洁能源安全高效利用、管道与压力容器服役安全，本文通信作者，Longmenshao@163.com；
于春雨(1987)，女，高级实验师，硕士，主要研究方向为过程装备与控制，296247120@qq.com；
汪浩瀚(1989)，男，硕士，实验师，主要研究方向为油气开发及仪器设备研制，286741140@qq.com。
基金资助:
四川省重点研发计划(2023YFS0355);成都市重点研发支撑计划(2022-YF05-00792-SN)

Structure and Control Optimization of the Buried Pipe Group Heat Exchanger With Vertical Inlet and Flat Outlet

Peifa MA¹^,², Jie ZHANG¹^,²^,³, Chunyu YU¹^,³, Haohan WANG²

^1.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan Province, China
^2.Geothermal Energy Research Center, Southwest Petroleum University, Chengdu 610500, Sichuan Province, China
^3.Oil and Gas Equipment Technology Sharing Service Platform of Sichuan Province, Chengdu 610500, Sichuan Province, China

Received:2023-07-23 Revised:2023-10-09 Published:2024-06-30 Online:2024-07-01
Contact: Jie ZHANG
Supported by:
Key R&D Plan of Sichuan Province(2023YFS0355);Key R&D Support Plan of Chengdu(2022-YF05-00792-SN)

摘要/Abstract

摘要：

目的为提高浅层地热能利用效率，亟须对影响地源热泵系统性能的地埋管换热器结构和控制开展优化设计。方法建立了一种竖进平出型地埋管群换热器模型，研究其换热系统性能，探究其最佳结构及运行方式。结果管群布置横纵比越低，单位面积换热量越大，横纵比超过0.15后对系统影响较小；换热器间距越小，土壤利用率越高，但热短路损失越大；双列双出型埋管每延米换热量相较于双列单出型结构提升7%以上；负荷较大工况下叉排布置结构的换热效果更好；整个夏季优化结构的平均出口温度下降2.28 ℃，换热器周围土壤温度下降1 ℃以上；实际运行过程中应优先考虑采用流速随负荷变化控制模式。结论研究结果可为地源热泵换热器的设计、制造提供理论依据。

关键词: 地源热泵, 地埋管群, 换热器, 热短路, 控制模式

Abstract:

Objectives In order to improve the utilization efficiency of shallow geothermal energy, it is urgent to optimize the structure and control of ground heat exchanger, which affects the performance of ground source heat pump system. Methods A model of the buried pipe group heat exchanger with vertical inlet and flat outlet was established. Based on heat exchange system performance, the optimal structure and operation control mode were explored. Results The heat transfer per unit area increases with the decreasing of transverse longitudinal ratio of the pipe group arrangement. The effect is small when the transverse longitudinal ratio exceeds 0.15. The smaller the heat exchanger spacing is, the higher the soil utilization rate is, but the greater the thermal short-circuit loss is. Compared with the double-row single-outlet type, the heat exchange per linear meter of the double-row double-outlet type buried pipe is increased by more than 7%. The fork arrangement is better when the load is larger. The average outlet temperature of optimization structure in the whole summer is decreased by 2.28 ℃, and the soil temperature around the heat exchanger is decreased by more than 1℃. In the actual operation process, the control mode of the flow rate changing with load should be given priority. Conclusions The research results can provide a theoretical basis for the design and manufacture of ground source heat pump heat exchanger.

Key words: ground source heat pump, underground pipe group, heat exchanger, thermal short circuit, control mode

中图分类号:

TK 11

马培发, 张杰, 于春雨, 汪浩瀚. 竖进平出型地埋管群换热器结构与控制优化[J]. 发电技术, 2024, 45(3): 478-485.

Peifa MA, Jie ZHANG, Chunyu YU, Haohan WANG. Structure and Control Optimization of the Buried Pipe Group Heat Exchanger With Vertical Inlet and Flat Outlet[J]. Power Generation Technology, 2024, 45(3): 478-485.

图/表 17

图1 竖进平出型地埋管群换热器

Fig. 1 Heat exchanger with vertical inlet and flat outlet

图2 双列双出与双列单出结构

Fig. 2 Structure of double-row double-outlet and double-row single-outlet

图3 2种结构换热性能

Fig. 3 Heat transfer performance of two structures

图4 2种结构埋管温度

Fig. 4 Temperature distribution of two structures

图5 不同流量、换热器间距、竖直管间距组合

Fig. 5 Orthogonal combination of different flow rates, heat exchanger spacings, and vertical tube spacings

图6 不同组合结构换热性能

Fig. 6 Heat transfer performance of different combined structures

图7 不同换热器间距的热短路损失系数

Fig. 7 Thermal short-circuit loss coefficient of different heat exchanger spacings

图8 不同列数的单位面积换热量

Fig. 8 Heat transfer per unit area with different rows

图9 不同横纵比的热短路损失系数

Fig. 9 Thermal short-circuit loss coefficients with different width-to-length ratios

图10 不同列数的温度分布

Fig. 10 Temperatures with different rows

图11 叉排和顺排换热性能对比

Fig. 11 Comparison of heat transfer performance between forked row and in-line row

图12 叉排和顺排温度

Fig. 12 Temperature of forked row and in-line row

图13 不同控制模式换热器出口温度

Fig. 13 Outlet temperature of heat exchanger under different control modes

表1 优化前后结构参数

Tab. 1 Structural parameters before and after optimization

结构	流量/(L/s)	竖直管间距/m	换热器间距/m	多列单出类型	叉排/顺排	控制方式
初始结构	2.4	2	1.2	双列单出	顺排	定流速
结构1	1.2	1	1.2	双列双出	叉排	定流速
结构2	3.6	1	1.2	双列双出	叉排	定流速
结构3	随负荷变化	1	1.2	双列双出	叉排	定温差

图14 不同结构换热器的出口温度

Fig. 14 Outlet temperature of heat exchangers with different structures

图15 夏季运行结束时不同结构水平方向土壤过余温度

Fig. 15 Excess soil temperature in different structural horizontal directions at the end of summer operation

图16 夏季运行结束时不同结构土壤温度

Fig. 16 Soil temperature of different structures at the end of summer operation

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竖进平出型地埋管群换热器结构与控制优化

Structure and Control Optimization of the Buried Pipe Group Heat Exchanger With Vertical Inlet and Flat Outlet

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