Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (6): 113-118.doi: 10.6040/j.issn.1672-3961.0.2019.317

• Mechanical, Energy and Power Engineering • Previous Articles     Next Articles

Analysis of factors affecting heat transfer of double U-shaped buried tubes based on TRNSYS

Tao LIU(),Ye TIAN,Yongzhi MA*()   

  1. College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266022, Shandong, China
  • Received:2019-06-19 Online:2019-12-20 Published:2019-12-17
  • Contact: Yongzhi MA E-mail:949090356@qq.com;hiking@126.com

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Abstract:

Because the horizontal buried tubes covered a large area, the heat transfer effect was poor, and the initial investment of the vertical buried tubes was high, the construction was difficult. A transient real-time simulation model of double U-shaped buried tubes heat exchanger was established with TRNSYS software. The factors, which could affect the heat transfer capacity of double U-shaped buried tubes heat exchanger, including the number and the spaceing of holes, and the depth of the buried tubes were analyzed under the condition of unique variable. The simulation experiment results showed that the heat transfer effect of buried tubes could be improved by increasing the number of holes, deepening drilling depth and increasing the spacing of the holes. It provided an analytical basis for the balance between the heat transfer effect of the buried tubes and the construction difficulty.

Key words: double U-shaped buried tube heat exchanger, number of holes, hole depth, hole spacing, outlet water temperature of buried tubes

CLC Number: 

  • TU83

Fig.1

Ground source heat pump unit"

Table 1

Ground pipe parameter setting"

水平管埋深/m U型管外径/m U型管内径/m 管中心间距/m 钻孔半径/m U型管类型 设计温度/℃ 土壤初始温度/℃ 埋管热导率/
(kJ·(h·m·K)-1)		 参考流量/
(kg·h-1)		 回填材料热导率/
(kJ·(h·m·K)-1)		 流体比热容/
(kJ·(kg·K)-1)		 土壤传热系数/
(kJ·(h·m·K)-1)		 土壤比热容/
(kJ·(m3·K)-1)
2.5 0.034 0.028 0.05 0.075 双U 7 13 1.512 11 910 4.68 4.19 3.96 2 200

Fig.2

Double U-type buried tube heat exchanger"

Fig.3

Simulation model results"

Fig.4

Effect of 40 holes on the outlet temperature of buried tube"

Fig.5

Effect of 80 holes on the outlet temperature of buried tube"

Fig.6

Effect of 120 holes on the outlet temperature of buried tube"

Fig.7

Effect of 70 m hole deep on the outlet temperature of buried tube"

Fig.8

Effect of 100 m hole deep on the outlet temperature of buried tube"

Fig.9

Effect of 130 m hole deep on the outlet temperature of buried tube"

Fig.10

Effect of 3 m tube spacing on ground tube outlet temperature"

Fig.11

Effect of 5 m tube spacing on ground tube outlet temperature"

Fig.12

Effect of 7 m tube spacing on ground tube outlet temperature"

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