Variability of Soil Temperatures During 5 Years of a Horizontal Heat Exchanger Operation Co-operating with a Heat Pump in a Single-Family House

Conference paper
Part of the Springer Proceedings in Energy book series (SPE)

Abstract

The paper presents the results of measurements of the temperature distribution of the ground source heat with the brine-water heat pump and a horizontal ground heat exchanger. The research was carried out for a period of 5 years. The horizontal ground heat exchanger is a ground source for a heat pump with the measured average heating output of 9.53 kW and cooling capacity of 7.8 kW, installed in a single-family house located in the north-eastern part of Poland. A heat exchanger with the area of 253 m2 is located at a depth of 1.9 m in the groundwater layer being in hydraulic contact with the waters of Lake Elk. During the first four years, each year it can be observed that soil of the ground heat source is chilling at a depth of 1.9 m, due to working heat pump. Between January and April heat pump was working with the ground source frozen, where the temperature ranged from −0.6 to −2.1 °C. Subsidence and cooling of the soil was caused by a relatively small active area of ground source of heat which was 253 m2 with the dimensions of 11 m × 23 m, as well as inadequate spacing between sections of the spiral heat exchanger amounting to 0.1 m. After operational testing of the heat pump and the ground source of heat, the “microBMS” a control and optimization system, working independently from the heat pump control was introduced into the building in January 2014. Its introduction has significantly increased that lower minimum flow temperature of the heat exchanger to +0.3–0.9 °C. There was also an increase of the minimum temperature of the ground source heat exchanger by the value of +1.3–3.0 °C and decrease in cooling of the soil in August—an increase of temperature by about 0.7 °C. Operational tests of heat pump system working with an unusual and original application of horizontal spiral heat exchanger have shown that in the first period introduction of an additional heat exchanger was considered. In subsequent years of heat pump operation and after the introduction of its independent monitoring and optimization, the study showed good properties of ground source and its complete recovery in the summer. Ground source, chilled properly to a temperature of about 0 °C became a very good cooling reservoir during periods of spring and summer heat. The use of the Earth’s heat helps to improve the environment, while in some way it violates the natural thermal and agrophysical condition of the ground. Operation of ground source heat pump affects the periodic changes of agro-thermal parameters of soil. The delay of the vegetation period above the horizontal heat exchanger of heat pump is about 13 days and is caused by postponed thawing of ground observed at 0.05 m.

Keywords

Temperature distribution Horizontal ground heat exchanger Ground Heat pump 

Notes

Acknowledgements

The study has been implemented from the resources of the S/WBiIŚ/4/14 statutory work financed by the Ministry of Science and Higher Education in Poland.

References

  1. 1.
    Zheng, T., Shao, H., Schelenz, S., Hein, P., Vienken, T., Pang, Z., Kolditz, O., Nagel, T.: Efficiency and economic analysis of utilizing latent heat from groundwater freezing in the context of borehole heat exchanger coupled ground source heat pump systems. Appl. Therm. Eng. 105, 314–326 (2015).  https://doi.org/10.1016/j.applthermaleng.2016.05.158 CrossRefGoogle Scholar
  2. 2.
    Huining, X., Spitler, J.D.: The relative importance of moisture transfer, soil freezing and snow cover on ground temperature predictions. Renew. Energy 72, 1–11 (2014).  https://doi.org/10.1016/j.renene.2014.06.044 CrossRefGoogle Scholar
  3. 3.
    Tarnawski, V.R., Leong, W.H., Momose, T., Hamada, Y.: Analysis of ground source heat pumps with horizontal ground heat exchangers for northern Japan. Renew. Energy 34, 127–134 (2009).  https://doi.org/10.1016/j.renene.2008.03.026 CrossRefGoogle Scholar
  4. 4.
    Gonzalez, R.A., Verhoef, A., Vidale, P., Main, B., Gan, G., Wu, Y.: Interactions between the physical soil environment and a horizontal ground coupled heat pump, for a domestic site in the UK. Renew. Energy 44, 141–153 (2012).  https://doi.org/10.1016/j.renene.2012.01.080
  5. 5.
    van Manen, S.M., Wallin, E.: Ground temperature profiles and thermal rock properties at Wairakei, New Zealand. Renew. Energy 43, 313–321 (2012).  https://doi.org/10.1016/j.renene.2011.11.032 CrossRefGoogle Scholar
  6. 6.
    Florides, G.A., Pouloupatis, P.D., Kalogirou, S., Messaritis, V., Panayides, I., Zomeni, Z., Partasides, G., Lizides, A., Sophocleous, E., Koutsoumpas, K.: The geothermal characteristics of the ground and the potential of using ground coupled heat pumps in Cyprus. Energy 36, 5027–5036 (2011).  https://doi.org/10.1016/j.energy.2011.05.048 CrossRefGoogle Scholar
  7. 7.
    Congedo, P.M., Colangelo, G., Starace, G.: CFD simulations of horizontal ground heat exchangers: a comparison among different configuration. Appl. Therm. Eng. 3334, 24–32 (2012).  https://doi.org/10.1016/j.applthermaleng.2011.09.005
  8. 8.
    Vietel, M., Rouabhi, M., Tijani, M., Guerin, F.: Modeling heat transfer between a freeze pipe and the surrounding ground during artificial ground freezing activities. Comput. Geotech. 63, 99–111 (2015).  https://doi.org/10.1016/j.compgeo.2014.08.004 CrossRefGoogle Scholar
  9. 9.
    Fujii, H., Nishi, K., Komaniwa, Y., Chou, N.: Numerical modeling of slinky-coil horizontal ground heat exchangers. Geothermics 41, 55–62 (2012).  https://doi.org/10.1016/j.geothermics.2011.09.002
  10. 10.
    Kim, J., Lee, Y., Yoon, W.S., Jeon, J.S., Koo, M.-H., Keehm, Y.: Numerical modeling of aquifer thermal energy storage system. Energy 35, 4955–4965 (2010).  https://doi.org/10.1016/j.energy.2010.08.029
  11. 11.
    Fontaine, P.O., Marcotte, D., Pasquier, P., Thibodeau, D.: Modeling of horizontal geoexchange systems for building heating and permafrost stabilization. Geothermics 40, 211–220 (2011).  https://doi.org/10.1016/j.geothermics.2011.07.002 Google Scholar
  12. 12.
    Al-Hinti, I., Al-Muhtady, A., Al-Kouz, W.: Measurement and modelling of the ground temperature profile in Zarqa, Jordan for geothermal heat pump applications. Appl. Therm. Eng. 123, 131–137 (2017).  https://doi.org/10.1016/j.applthermaleng.2017.05.107
  13. 13.
    Adamovsky, D., Neuberger, P., Adamovsky, P.: Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps. Energy Build. 92, 107–115 (2015).  https://doi.org/10.1016/j.enbuild.2015.01.052 CrossRefGoogle Scholar
  14. 14.
    Qi, D., Pu, L., Sun, F., Li, Y.: Numerical investigation on thermal performance of ground heat exchangers using phase change materials as grout for ground source heat pump system. Appl. Therm. Eng. 106, 1023–1032 (2016).  https://doi.org/10.1016/j.applthermaleng.2016.06.048 CrossRefGoogle Scholar
  15. 15.
    Wu, Y., Gan, G., Verhoef, A., Vidale, P.L., Gonzalez, R.G.: Experimental measurement and numerical simulation of horizontal-coupled slinky ground source heat exchangers. Appl. Therm. Eng. 30, 2574–2583 (2010).  https://doi.org/10.1016/j.applthermaleng.2010.07.008 CrossRefGoogle Scholar
  16. 16.
    Dehghan, B.: Experimental and computational investigation of the spiral ground heat exchangers for ground source heat pump applications. Appl. Therm. Eng. 121, 908–921 (2017).  https://doi.org/10.1016/j.applthermaleng.2017.05.002 CrossRefGoogle Scholar
  17. 17.
    Lachman, P. (eds.): Guidelines for design, construction and commissioning of heat pump installations, part 1. Lower Heat Source Sources. Polish Organization for the Development of Heat Pump Technology, Cracow (2013) (in Polish)Google Scholar
  18. 18.
    Zheng, T., Shao, H., Schelenz, S., Hein, P., Vienken, T., Pang, Z., Kolditz, O., Nagel, T.: Efficiency and economic analysis of utilizing latent heat from groundwater freezing in the context of borehole heat exchanger coupled ground source heat pump system. Appl. Therm. Eng. 105, 314–326 (2016).  https://doi.org/10.1016/j.applthermaleng.2016.05.158 CrossRefGoogle Scholar
  19. 19.
    Hsiao, M.J., Kuo, Y.F., Shen, Ch., Cheng, Ch.: Performance enhancement of a heat pump system with ice storage subcooler. Int. J. Refrig. 33(2), 251–258 (2010).  https://doi.org/10.1016/j.ijrefrig.2009.11.002
  20. 20.
    Baggs, S.A.: Remote prediction of ground temperature in Australian soils and mapping its distribution. Sol. Energy 30(4), 351–366 (1983).  https://doi.org/10.1016/0038-092X(83)90189-5 CrossRefGoogle Scholar
  21. 21.
    Popiel, C.O., Wojtkowiak, J., Prętka, I.: Effect of surface cover on ground temperature season’s fluctuations. Found. Civil Environ. Eng. 1(2), 151–164 (2002). bwmeta1.element.baztech-article-BPP1-0042-0084Google Scholar

Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Department of HVAC Engineering, Faculty of Civil Engineering and Environmental EngineeringBialystok University of TechnologyBialystokPoland

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