A Numerical Simulation Method of the Ground Temperature for Multiple Ground Heat Exchangers

2012 ◽  
Vol 516-517 ◽  
pp. 131-134
Author(s):  
Jun Yong Sang ◽  
Dan Zhang ◽  
Fa Hui Wang
Keyword(s):  
Heat Exchangers ◽  
Simulation Method ◽  
Source Model ◽  
Ground Temperature ◽  
Analytical Models ◽  
Load Factor ◽  
Time Step ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Heat Exchangers

This paper presented the numerical simulations on Multiple Ground Heat Exchangers. The two coupled solutions were solved iteratively at each time step, and the simulated ground temperature was calibrated using a cylindrical source model by adjusting the grid spacing and adopting a load factor of 1.047 in the difference equation. With constant load applied to a single tube. The ground temperature profiles were not similar at different distances from the tube. The introduction of time schedule revealed a discrepancy between the load applied to the ground heat exchanger and that transferred from the tube to the ground, which was usually assumed to be the same when using analytical models. Hence, in designing a large Ground source heat pump system, the present method should give more precise results in dynamic simulation.

Effect of the Circulation Flow Velocity in Ground Heat Exchangers on System Operation

2014 ◽  
Vol 580-583 ◽  
pp. 2457-2460
Author(s):  
Zi Shu Qi ◽  
Qing Gao ◽  
Yan Liu ◽  
Zhen Hai Gao ◽  
Li Bai
Keyword(s):  
Flow Velocity ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Engineering Practice ◽  
Fluid Temperature ◽  
Circulation Flow ◽  
Pump System ◽  
Heat Pump System ◽  
Computing Platform ◽  
Ground Heat Exchangers

The heat pump system by using earth energy is increasing very rapidly. In this paper, by studying the underground heat exchanger heat transfer mode, the computing platform for ground source heat pump system was established. Through a engineering case, the influence character of the circulation flow velocity in ground heat exchangers on the fluid temperature, the heat pump power consumption, and the length of system were analyzed, which provide an approach for system engineering design and operation prediction, and for the thermodynamic analysis of performance of system year by year and prospective study to guide the engineering practice.

Heat Transfer Analysis of Groundwater Flow for Ground Heat Exchangers in the Multi-Borehole Field of Ground Source Heat Pump under the Intermittent Operation

2014 ◽  
Vol 548-549 ◽  
pp. 595-600
Author(s):  
Can Can Zhang ◽  
Yue Jin Yu
Keyword(s):  
Groundwater Flow ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Heat Transfer Analysis ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Heat Exchangers ◽  
Ground Source ◽  
Thermal Interference

In order to analyze the influence of groundwater flow on ground heat exchangers with different arrangements, with a project in Nanjing the access temperature field in the multi-borehole field was simulated after the ground source heat pump system had been performed for a year. Simulation results show that the access temperature is higher in the ground surrounding the borehole than the center of the corresponding borehole, thus forming a thermal barrier surrounding the borehole. Groundwater flow helps relieve temperature imbalance owing to the imbalance of heating and cooling load. The performance of the ground heat exchangers is better in staggered arrangement than in aligned arrangement. In the borehole field, the boreholes upstream have thermal interference on those downstream. And the extent of thermal interference depends on the direction of the groundwater flow when the locations of the boreholes are fixed in the borehole field.

Research on Heat Transfer and Environmental Impact of Horizontal Ground Heat Exchangers in Multi-Grooves

2012 ◽  
Vol 516-517 ◽  
pp. 395-400
Author(s):  
Zhong Yi Yu ◽  
Yan Hua Chen ◽  
Min Rui Zhou ◽  
Jian Ping Lei
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Temperature Drop ◽  
Heat Extraction ◽  
Maximum Temperature ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Heat Exchangers ◽  
Average Maximum ◽  
Average Maximum Temperature

This paper progresses to dynamically simulate and study the heat transfer process of horizontal ground heat exchangers in the multi-grooves by the use of numerical simulation based on the layout and heat extraction or rejection conditions of horizontal ground heat exchangers under the artificial lake. Effect of buried pipe type and groove spacing on the heat exchanger process is analyzed in detail. The influence of annual average water temperature change on the surrounding environment is evaluated with the introduction of parameters including summer weekly average maximum temperature rise and winter weekly average maximum temperature drop, in which can take the technical supports for the design of horizontal ground source heat pump system.

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