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

Abstract:

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.

• Periodical: Applied Mechanics and Materials (Volumes 548-549)
• Pages: 595-600
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.548-549.595
• Online since: April 2014
• Authors: Can Can Zhang*, Yue Jin Yu
• Keywords: Aligned Arrangement, Excess Temperature, Ground Heat Exchangers, Groundwater Flow Direction, Staggered Arrangement

References

[1] X.C. Wang: Heating Ventilating & Air Conditioning, Vol. 37 (2007), pp.38-43.

[2] R. Fan, Y. Gao, X. Chen and W. D. Long: Joural of Tongji University (Natural Science), Vol. 39 (2011), pp.282-286.

[3] Y.D. He and Z. Meng: Heating Ventilating & Air Conditioning, Vol. 39 (2009), pp.74-76.

[4] L. C. Liu, Y. D. Zhang, S. J. Liu and J. S. Wang: Acta Energiae Solaris Sinica, Vol. 29 (2008), pp.1072-1077.

[5] N.R. Diao and Z. H. Fang: Ground-coupled Heat Pump Technology (Higher Education Press, China 2006).

[6] J.J. Cai, R. D. Chen and J. Wang: Fluid In Machinery, Vol. 37 (2009), pp.62-67.

[7] Q.P. Wang: A Study of Underground Water Transfusion to Ground Source Heat Pump (MS., Beijing University of Technology, China 2007).

[8] Yuill G K: ASHRAE Transactions-American Society of Heating Refrigerating Airconditioning Engin, Vol. 101 (1995), pp.173-185.

[9] N.R. Diao, Q. Y. Li and Z. H. Fang: Joural of Shandong University of Architecture and Engineering, Vol. 18 (2003), pp.1-5.

[10] W.K. Zhang, H. X. Yang and L. L. Sun: Heating Ventilating & Air Conditioning, Vol. 42 (2012), pp.129-134.

[11] R. Fan and Z. L. Ma: Heating Ventilating & Air Conditioning, Vol. 36 (2006), pp.25-29.

[12] X. H. Tan and L. X. Ding: Refrigeration and Air Conditioning and Power Machinery, Vol. 24(2003), pp.14-16.

[13] H. Long, Y. J. Yu and Z. Q. Feng: Acta Energiae Solaris Sinica, Vol. 32 (2011), pp.862-867.

[14] Y.Z. Wei, G. Q. Zhou, Z. D. Liu and L. Wu: Heating Ventilating & Air Conditioning, Vol. 41(2011), pp.143-147.

[15] Eskilson P: Thermal Analysis of Heat Extraction Boreholes (MS., University of Lund, Sweden 1987).

[16] Hellström G: Ground Heat Storage: Thermal Analyses of Duct Storage Systems (MS., University of Lund, Sweden 1991).

[17] Spitler J D, X. Liu and Rees: Joural of Shandong University of Architecture and Engineering, Vol. 18 (2003), pp.1-10.