Authors

Non-uniformity of geothermal well heat pump temperature field

UDC 536.1

Non-uniformity of geothermal well heat pump temperature field

Baranov I.V., Krylov V. А., Chernoozersky V. А., Nikitin А. А.

Abstract
The article deals with temperature field of heat pump geothermal well. In designing heat pump systems calculation methods of geothermal wells with temperature filed uniform along the well length are used. Common physical notions about thermal field distribution in technical systems allow assuming temperature distribution in heat pump geothermal well to be of non-uniform character. To verify it three dimensional parametric model of test stand was developed by Flow Simulation module of the SolidWorks software. It allows calculating temperature field distribution in a simulated well on the basis of the model and finite element method. The numerical model obtained shows the non-uniformity of the temperature field. The research shows some disadvantages of the exiting calculation methods. Then, new calculation method for geothermal heat exchangers taking into account temperature filed non-uniformity and, therefore, increasing heat pump efficiency should be developed.

Keywords: heat pump, temperature field, test stand, thermal conductivity

All references

II All-Russian congress of young scientists. On April 9-12, 2013, Electronic collection of theses of reports of the congress of young scientists. Warm and physical instrument making. Theoretical bases warm and hladotekhnik. Vol. 4. P. 10. (in Russian)
Vasilyev G.P. Heatcold supply of buildings and constructions with use of low-potential thermal energy of blankets of Earth. Monograph. Moscow, 2006. 176 p. (in Russian)
VIESSMAN, instruction on design. Vitocal 300/350, thermal pumping installations. (in Russian)
Karl Ochsner. Geothermal Heat Pumps. A Guide for Planning and Installing,First published by Earthscan in the UK and USA in 2007, 67 р.
Lykov A.V. Theory of heat conduction. Moscow, 1967. (in Russian)
Shtym A.S., Markelova I.A. Systems of heatcollection for geothermal thermal pumps. Vestnik VolgGASU. Seriya: Str-vo i arkhit. 2011. Vol. 23(42). p. 126–133. (in Russian)
Oppelt, T., Riehl, I., Gross, U. (2010). Modelling of the borehole filling of double U-pipe heat exchangers. Geothermics, 39(3), р. 270-276.
Krylov V.A., Nikitin A.A., Chernoozersky V.A. The experimental bench for research of distribution of a heat flux in soil, the Collection of theses of reports of the congress of young scientists. St. Petersburg: NIU ITMO, 2014. Vol. 4. (in Russian)
Krylov V.A., Nikitin A.A., Chernoozersky V.A. Numerical modeling of distribution of heat fluxes in systems with geothermal heat exchangers, the Collection of theses of reports of the congress of young scientists. St. Petersburg: NIU ITMO, 2014. Vol. 4. (in Russian)
Rei D., Makmaikl D. Thermal pumps. Moscow: Energoizdat, 1982. 224 p.
Platunov E.S., Baranov I.V., Kuslieva E.V. Automatic instrument for measuring thermal physical characteristics of moisture containing materials.Vestnik Mezhdunarodnoi akademii kholoda. 2009. No 3. (in Russian)
Baranov I.V., Nikitin A.A. Complex measurements of heatphysical characteristics of the moisture containing materials when freezing and defrosting. Vestnik Mezhdunarodnoi akademii kholoda. 2007. No 1. p. 24-27. (in Russian)
Tambulatova E.V., Platunov E.S., Baranov I.V. Results of research of thermal physical properties of sucrose aqueous solutions. Vestnik Mezhdunarodnoi akademii kholoda. 2010. No 3. p. 42-47. (in Russian)