Heat Transfer Performance Analysis of Horizontal Ground Heat Exchanger under the Artificial Lake

According to the application conditions of horizontal ground heat exchanger(HGHE) under artificial lake, this paper uses numerical simulation method to do dynamic simulation research of the heat transfer performance of HGHE, analyzes the effect of connection mode and pipe flow velocity on heat transfer performance of HGHE in detail，puts forward efficient HGHE loop formation mode，and will provide effective technical support for ground-source heat pump system design with HGHE.

Download Full-text

Study on heat transfer performance of geothermal pile-foundation heat exchanger in GSHP system

E3S Web of Conferences ◽

10.1051/e3sconf/201911106068 ◽

2019 ◽

Vol 111 ◽

pp. 06068

Author(s):

Hezhi Zhang ◽

Bo Xu ◽

Zhenqian Chen

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pile Foundation ◽

Heat Transfer Performance ◽

Physical Models ◽

Transfer Performance ◽

Pump System ◽

Heat Pump System ◽

Cooling Period ◽

Study Results

In order to study the heat transfer performance of geothermal pile-foundation heat exchanger in ground source heat pump system (GSHP), the physical models of pile-foundation heat exchanger and heat exchanger group were established. The heat transfer processes of pile-foundation heat exchanger and heat transfer performance was analyzed both in cooling and heating mode. To carry out the simulation of heat transfer process for 3×3 energy piles, an office building located in Nanjing was introduced. The all-year dynamic building load was calculated with DeST, including the cooling period from June to September, the heating period from December to March and two recovery periods. After ten year’s running, the average soil temperature increases in non-equilibrium condition. Study results are approximate to the actual situation and can be used as theoretical basis for the design and application of pile-foundation heat exchanger in GSHP system.

Download Full-text

Research on the Construction Technology of Radial Underground Heat Exchanger and its Heat Exchange Performance

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.2488 ◽

2014 ◽

Vol 580-583 ◽

pp. 2488-2491

Author(s):

Rong Hui Wang ◽

Qing Hua Wang ◽

Ye Feng

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Exchange ◽

Surface Temperature ◽

Heat Transfer Performance ◽

Transfer Performance ◽

Ground Heat Exchanger ◽

Construction Technology ◽

Exchange Performance ◽

Radial Heat

5 radial heat exchange wells were designed, and the different angle drilling, drilling pipe, and grouting backfill construction technology was studied. In addition, the heat transfer performance of the buried radial heat exchange wells was tested. The results show that, design of pipe equipment is feasible, construction is convenient, and the ratio of backfill material is reasonable; the heat transfer performance of 90 °buried tube is the best. The smaller the angle with the ground heat exchanger, the greater the heat exchange performance is affected by the surface temperature.

Download Full-text

UNSTEADY HEAT TRANSFER IN A HORIZONTAL GROUND HEAT EXCHANGER

Industrial Heat Engineering ◽

10.31472/ihe.4.2018.05 ◽

2018 ◽

Vol 40 (4) ◽

pp. 34-40

Author(s):

B.I. Basok ◽

B.V. Davidenko ◽

I.K. Bozhko ◽

M.V. Moroz

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Three Dimensional ◽

Heat Transfer Agent ◽

Ground Heat Exchanger ◽

Dimensional Model ◽

Three Dimensional Model ◽

Unsteady Heat Transfer ◽

Pump System ◽

Heat Pump System

By the three-dimensional model of heat transfer in the system "ground - horizontal ground heat exchanger - heat transfer agent", an analysis of the efficiency of the horizontal multi-loop heat exchanger, which is an element of the heat pump system, was carried out. Based on the results of numerical simulation, the time dependence of the heat transfer agent temperature at the outlet from the ground heat exchanger and the amount of heat extracted from the ground is determined. The results of calculations by the presented model are satisfactorily agree with the experimental data.

Download Full-text

Simulation Study on Heat Transferring Performance of Vertical T-Tube Ground Heat Exchangers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.547 ◽

2013 ◽

Vol 805-806 ◽

pp. 547-551

Author(s):

Shao Wen Shang ◽

Pei Pei Li ◽

Dong Wen Fang

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Common Ground ◽

Inlet Temperature ◽

Ground Heat Exchanger ◽

Pump System ◽

Heat Pump System ◽

Tube Heat Exchanger ◽

Ground Heat Exchangers ◽

Ground Source

In the Ground Source Heat Pump system, the vertical U-tube is the most common ground heat exchanger. The heat transfer between the U-tube and the soil is affected by many factors. For analyzing the influence of these factors on heat transfer of the U-tube, I use GAMBIT software to establish a physical model who is used to simulated the heat exchanging of single U-tube heat exchanger and the surrounding soil physical. and mesh it. On the base, we take advantage of FLUENT software to make numerical simulation. After finishing analysis, we got some conclusions as follows: Under different tube wells depths and different inlet water temperature conditions, with the pipe inlet velocity increases, the heat exchanger performance improves, but the temperature difference between the import and the export will decreases. In addition to improve the inlet temperature of the U-tube, we can significantly increase the transferring heat of the ground heat exchanger.

Download Full-text

Performance of Conventional and Innovative Single U-Tube Pipe Configuration in Vertical Ground Heat Exchanger (VGHE)

Sustainability ◽

10.3390/su13116384 ◽

2021 ◽

Vol 13 (11) ◽

pp. 6384

Author(s):

Adel Eswiasi ◽

Phalguni Mukhopadhyaya

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Transfer Rate ◽

Thermal Efficiency ◽

Transfer Rate ◽

Green Technology ◽

Ground Heat Exchanger ◽

Pump System ◽

Heat Pump System ◽

Vertical Ground

A ground source heat pump system (GSHP) with a ground heat exchanger (GHE) is a renewable and green technology used for heating and cooling residential and commercial buildings. An innovative U-Tube pipe configuration is suggested to enhance the heat transfer rate in the vertical ground heat exchanger (VGHE). Laboratory experiments are conducted to compare the thermal efficiency of VGHEs with two different pipe configurations: (1) an innovative U-Tube pipe configuration (single U-Tube with two outer fins) and (2) a single U-Tube. The results show that the difference between the inlet and outlet temperatures for the innovative U-Tube pipe configuration was 0.7 °C after 60 h, while it was 0.4 °C for the single U-Tube after the same amount of time. The borehole thermal resistance for the innovative U-Tube pipe configuration was 0.680 m·K/W, which is 29.22% lower than that of the single U-Tube. The heat exchange rate in the innovative U-Tube pipe configuration is increased by 57.95% compared to the conventional single U-Tube. Measured ground temperatures indicate that compared to single U-Tube pipe configuration, the innovative U-Tube pipe configuration has superior heat transfer performance. Based on the experimental results presented in this paper, it was concluded that increasing the surface area significantly by introducing external fins to the U-Tube enhances the heat transfer rate, resulting in increased thermal efficiency of the VGHE.

Download Full-text