Skip to main content
SpringerLink
Log in

Simulating the thermal operating conditions in the thermal wells of ground-source heat-pump heat supply systems. Part II: Consideration of porous moisture phase transitions in soil

  • Energy Conservation, New and Renewable Energy Sources
  • Published:
Thermal Engineering Aims and scope Submit manuscript

Abstract

The mathematical model describing unsteady thermal operating conditions of ground-source heat-pump (GSHP) heat supply systems that takes into account porous moisture condensation/evaporation processes and that is laid down in the basis of the corresponding block of the INSOLAR.GSHP.12 software system is considered. The results of numerical and laboratory experiments confirming that the GSHP performance efficiency depends essentially on the phase transition processes of moisture contained in the soil strata porous space are presented. The problem of correctly taking into account the heat of porous moisture condensation/evaporation phenomena in simulating the thermal processes occurring in the soil strata surrounding GSHP thermal wells is considered. A mathematical description of porous moisture condensation/evaporation processes for a vertical thermal well in the cylindrical coordinate system is given. A numerical experiment on estimating the effect the porous moisture condensation/evaporation processes have on the soil thermal conditions was carried out after the mathematical model had been implemented in a software block. The presented results obtained from the performed numerical experiment show that the temperature levels of soil adjacent to the thermal well determined with and without taking the heat of porous moisture condensation processes may differ from each other by more than 3°C. The results from experimentally approbating the application of a so-called effective soil thermal conductivity coefficient that takes into account the latent heat of porous moisture phase transitions in soil in modeling the GSHP thermal operating conditions are presented. The results of the performed experiments show that porous moisture phase transitions may have a very significant influence on the effective thermal conductivity of soil. The effective thermal conductivity values of soil may differ from each other by several times depending on the soil system operating conditions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. G. P. Vasilyev, N. V. Peskov, V. A. Lichman, V. F. Gornov, and M. V. Kolesova, “Simulating the thermal operating conditions in the thermal wells of ground-source heat-pump heat supply systems. Part I: Accounting the porous moisture freezing processes in soil,” Therm. Eng. 62 (8), (2015), DOI: 10.1134/S0040363615080081

    Google Scholar 

  2. J. W. Lund, D. H. Freeston, and T. L. Boyd, “Direct utilization of geothermal energy 2010 worldwide review,” Geothermics, No. 40, 159–180 (2011).

    Article  Google Scholar 

  3. G. P. Vasil’ev, “Operating experience with geothermal heat-pump heat-supplying systems and the technical aspects of integrating them rationally in the energy balance of Russia,” Therm. Eng. 51 (6), 459 (2004).

    Google Scholar 

  4. G. P. Vasil’ev, “Results of full-scale investigations of the thermal operating conditions of an experimental energyefficient house,” Stroit. Mater., Oborud., Tekhnol. XXI Veka, No. 6, 3–5 (2002).

    Google Scholar 

  5. S. C. Gupta, “The classical Stefan problem: basic concepts, modeling and analysis,” in North Holland Series in Applied Mathematics and Mechanics (JAI Press, 2003), http://elsevier.com.

    Google Scholar 

  6. H. Yang, P. Cui, and Z. Fang, “Vertical-borehole ground-coupled heat pumps: a review of models and systems,” Applied Energy, No. 87, 16–27 (2010).

    Article  Google Scholar 

  7. L. Lamarche, S. Kajl, and B. Beauchamp, “A review of methods to evaluate borehole thermal resistances in geothermal heat-pump systems,” Geothermics, No. 39, 187–200 (2010).

    Article  Google Scholar 

  8. M. G. Tarabanov, V. D. Korkin, and V. F. Sergeev, Humid Air: A Handbook (NP AVOK, Moscow, 2004) [in Russian].

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. INSOLAR-INVEST, Bol’shaya Filevskaya ul. 32, korp. 3, Moscow, 121433, Russia

    G. P. Vasilyev, N. V. Peskov, V. A. Lichman, V. F. Gornov & M. V. Kolesova

  2. Moscow State University, Moscow, 119991, Russia

    N. V. Peskov

Authors
  1. G. P. Vasilyev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. N. V. Peskov
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. V. A. Lichman
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. V. F. Gornov
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. M. V. Kolesova
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Original Russian Text © G.P. Vasilyev, N.V. Peskov, V.A. Lichman, V.F. Gornov, M.V. Kolesova, 2015, published in Teploenergetika.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Vasilyev, G.P., Peskov, N.V., Lichman, V.A. et al. Simulating the thermal operating conditions in the thermal wells of ground-source heat-pump heat supply systems. Part II: Consideration of porous moisture phase transitions in soil. Therm. Eng. 62, 751–756 (2015). https://doi.org/10.1134/S0040601515100109

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0040601515100109

Keywords

Search

Navigation