Обоснование соотношения площадей поперечного сечения грунтового теплообменника для геотермальной вентиляции
Journal Title: Математичне моделювання - Year 2016, Vol 1, Issue 2
Abstract
JUSTIFICATION FOR RATIO OF CROSS-SECTIONAL AREAS OF GROUND HEAT EXCHANGER FOR GEOTHERMAL VENTILATION Koviazin A. S. Abstract Effective management of the livestock industry is impossible without full feeding and create optimal conditions for the animals, which are mainly determined by the microclimate. Provision of optimal microclimate in livestock buildings requires a considerable amount of energy that is expended to 15 % of the funds manufacturers. Cooling (heating) supply air for livestock buildings can be carried out with the help of geothermal ventilation that allows the use of thermal energy of the surface of the Earth. The operating element of the geothermal ventilation are ground heat exchangers. For efficient use of ground heat exchanger is required to justify its geometrical parameters, one of which – the ratio of the cross sectional area of the inner tube to the cross sectional area of the tube space. The purpose of this article is to improve the efficiency of geothermal ventilation by the rational justification of the correlation of cross-sectional areas of ground heat exchanger. Air cooling better with increasing ratio of the cross sectional area of the inner tube to the cross sectional area of the tube space owing to the increase of air velocity in the tube space and increase the heat transfer coefficient on the surface of the casing tube of ground heat exchanger. On the other hand, increasing the area ratio leads to an increase in pressure loss in a ground heat exchanger. When the ratio of the areas at the level of 0.618 (the Golden ratio) and take place a minimum loss of pressure and effective thermal power of ground heat exchanger close to the maximum values for different volumetric supply of air. To improve the efficiency of ground heat exchanger is assumed that the ratio of the cross-sectional area of the inner tube to the cross-sectional area of the tube space should amount the Golden ratio. References [1] Koviazin A. S., Velichko I. G. Vliyanie materiala i tolshiny stenki obsadnoy truby gruntovogo teploobmennika na teplootbor iz massiva grunta [Influence of the material and casing wall thickness of a ground heat exchanger on energy extraction rate]. Lvov, Herald of national University "Lviv Polytechnic" "Power system. Engineering the environment. Automation", no. 758, 2013, pp. 57-62. (In Russian) [2] Koviazin A. S. Vliyanie na energosyom formy poperechnogo secheniya gruntovogo teploobmennika [Influence of the cross-section shape of a ground heat exchanger on energy extraction rate]. Kharkov, Bulletin of Kharkov national technical University of agriculture named Peter Vasilenko, "Technical systems and technology of animal husbandry", no. 132, 2013, pp. 251-255. (In Russian) [3] Shevchenko I., Koviazin A. Modelirovanie prirodnogo temperaturnogo poliya poverhnostnyh sloev Zemli [Simulation of the natural temperature field of the surface layers of the Earth]. An international journal on operation of farm and agri-food industry machinery: Motrol. Comission of motorizatin and energetics in agriculture, vol. 15, no. 3. Lublin-Rzeszóv, 2013, pp. 228-234. (In Russian) [4] Koviazin A. S., Dolgikh D. A. Obosnovanie dliny i diametra gruntovogo teploobmennika [Ground of the diameter and length of ground heat exchanger]. Glevaha, Mechanization and electrification of agriculture, 2013, pp. 96-105. (In Russian) [5] Bronstein I. N., Semendiaev K. A. Spravochnik po matematike dlya inzhenerov i uchashihsya vtuzov [Handbook of mathematics for engineers and pupils of technical colleges]. Moscow, 1986. 544 p. [6] Lykov A. V. Teoriya teploprovodnosti [Theory of thermal conductivity]. Moscow, 1967. 600 p. [7] Kreith F., Black W. Z. Osnovy teploperedachi [Basic heat transfer]. Moscow, 1983. 512 p. [8] Ivanov V. L., Leont'ev A. I., Manushin E. A. and oth. Teploobmennye apparaty i sistemy ohlazhdeniya gazoturbinnyh i kombinirovannyh ustanovok [Heat exchangers and cooling systems gas turbine and combined plants]. Moscow, 2004. 592 p. [9] Kovalnogov N. N., Kovrizhnykh E. N. Osnovy gidravliki [Basic of hydraulics]. Ulyanovsk, 2004. 86 p. [10] Loitsyansky L. G. Mehanika zhidkosti i gaza [Mechanics of liquid and gas]. Moscow, 2003. 840 p. [11] Orlov M. E. Teoreticheskie osnovy teplotechniki. Teplomassoobmen [Theoretical basis of heat engineering. Heat and mass transfer]. Ulyanovsk, 2013. 204 p. [12] Reay D., MacMichael D. Teplovie nasosy [Heat pumps. Design and applications]. Moscow, 1982. 224 p. [13] Andreas Lucke Pervichnaya energiya kak kriteriy energeticheskoy effektivnosti [The primary energy as the criterion of energy efficiency]. Moscow, Information and publishing company "AVOK-PRESS", no. 4, pp. 8-12. (In Russian)
Authors and Affiliations
А. С. Ковязин
Keywords
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