Study of functioning of heat exchanger in soils with different thermal diffusivity

О. S. Kovyazin


It was found with the help of mathematical model of the process of heat exchange between the air moving in vertical heat exchanger and the massif of soil, which connects energetic factors of the soil heat exchanger with its parameters as well as natural-climatic conditions that effective thermal energy during the term of heat exchanger functioning depends linearly on thermal diffusivity of soil both for separate heat exchanger and for two heat exchangers located at 4m between axes. Calculative experiment was conducted with application of the packet of calculative hydrodynamics ANSYS Fluent. Temperature field of the air being cooled and of the massif of soil has been detected for the soils with different thermal diffusivity. It has been found that temperature diffusivity of the soil is a determinative factor of energy potential of soil and has a dramatic effect on the effective thermal capacity especially for long-term functioning of soil heat exchanger. From the soil with temperature diffusivity 2,68 m2/s  we can obtain approximately 3,6 times as more effective thermal energy while heat exchanger is functioning than from the soil with temperature diffusivity 0,83 m2/s.


surface layers of the Earth; thermal energy; soil heat exchanger; thermal diffusivity of the soil


Bruyaka V. A., Fokin V. G., Soldusova E. A., Glazunova N. A., Adeyanov I. E., 2010. Engineering analysis in ANSYS Workbench. Samara: Ed. Samara State Technical University, 271 p. (in Russian).

Kovyazin A. S., 2017. Substantiation of the thermal insulation thickness of the inner pipe of a ground heat exchanger. Vestnik dvigatelestroyeniya (1), 19—24 (in Russian).

Kovyazin A. S., Velichko I. G., 2013. Influence of the material and wall thickness of the casing of the soil heat exchanger on heat removal from the soil mass. Visnyk Natsionalnoho universytetu «Lvivska politekhnika» (758), 57—63 (in Russian).

Loytsyanskiy L. G., 2003. Mechanics of fluid and gas. Moscow: Drofa, 840 p. (in Russian).

Lyuke A., 2011. Primary energy as a criterion of energy efficiency. Energosberezheniye (4), 8—12 (in Russian).

Ray D., McMichael D., 1982. Heat Pumps. Moscow: Energoizdat, 224 p. (in Russian).

Snegirev A. Yu., 2009. High-performance computing in technical physics. Numerical simulation of turbulent flows. St. Petersburg: Publishing house of Polytechnic University, 143 p. (in Russian).

Building codes and regulations 2.02.04-88, 2005. Foundations and foundations on permafrost soils. Moscow: Ed. State Unitary Enterprise — Design Products Center, 52 с. (in Russian).

ASHRAE Handbook. 2017 HVAC Application. Chapter 34, Energy Resources.

Menter F. R., 1993. Zonal two equation k-ω turbulence models for aerodynamic flows. AIAA Paper 93-2906. 21 p.

Shevchenko I., Kovyazin A., Kamiński J. R., Szeptycki A., 2017. Simulation of thermal field in soil. Problemy Inżynierii Rolniczej. № 1(95). Р. 57—65.



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