Please use this identifier to cite or link to this item:https://hdl.handle.net/20.500.12259/85184
Type of publication: Straipsnis kitose duomenų bazėse / Article in other databases (S4)
Field of Science: Mechanikos inžinerija / Mechanical Engineering (T009)
Author(s): Kavolėlis, Bronius
Title: Karvidės vėdinimo sistemos reguliavimo metodo sudarymas
Other Title: Evaluation regulation methods of the cowshed ventilation system
Is part of: Žemės ūkio inžinerija. , [T.] 38, Nr. 1 (2006)
Extent: p. 40-52
Date: 2006
Keywords: Kraigo plyšys;Vėdinimo anga;Savitasis plotas;Reguliavimas;Ridged opening;Ventilation opening;Specific area;Regulation
Abstract: Taikant statybinės šiluminės fizikos ir aerodinamikos principus bei atlikus tipiškų karvidžių statybinių ir technologinių rodiklių analizę sudarytas naujas natūralaus vėdinimo sistemos parametrų apskaičiavimo ir reguliavimo metodas, pagal kurį užterštam orui šalinti kraigo plyšio plotas atitinka šalčiausio laikotarpio (šalčiausio penkiadienio) reikalingą vėdinimo intensyvumą ir nereguliuojamas, o šviežiam orui įeiti angų sienose plotas keičiamas priklausomai nuo lauko oro temperatūros pagal sudarytą formulę. Tipiškoms pastaraisiais metais statomoms karvidėms rekomenduotinas užterštam orui šalinti kraigo plyšio savitasis plotas (plotas gyvulio bendrosios šilumos srauto kilovatui arba 500 kg masės karvei, duodančiai 18 kg pieno per parą) – 0,05-0,07 m². Didžiausias šviežiam orui įeiti angų vienoje išilginių sienų savitasis plotas – apie 0,12 m²/kW. Krentant lauko oro temperatūrai nuo 25 °C šilumos iki 20°C šalčio šis plotas sumažinamas 80 %
The objective of the work is to compose the new regulation and calculation method for natural ventilation system parameters, according which, in order to eliminate polluted air, the opening of cowshed ridge would satisfy the required ventilation intensity during the coldest period without being regulated. The width of openings in the wall for fresh air is changed according outside temperature, subject to the equation. While composing the method, analytical researches were used, applying construction thermal physics and aerodynamic principles. The ultimate equations were related to the construction and technological factors of recently built and perspective cowsheds. In order to increase the universality of the method the width of the ventilation openings are expressed in total animal heat flow unit. The equation for calculation of specific width of ridge openings for elimination of polluted air was composed; as well as the equation for calculation of specific width of wall openings for fresh air. For practical application of this method the data was collected about constructions and technological rates of 21-24 m width cowsheds in 160-230 places. As a result the equation was composed, according to which the width of the openings for fresh air was regulated. The recommended specific width of ridge openings for elimination of polluted air (the width per one total animal heat flow kilowatt) is 0.05-0.07 m²/kW. The greatest specific width of openings in the one longitudinal wall for fresh air is 0.12 m²/kW. When outside temperature decreases from plus 25 °C to minus 20 °C this width is reduced to 80 %
Internet: https://hdl.handle.net/20.500.12259/85184
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

Files in This Item:
marc.xml7.39 kBXMLView/Open

MARC21 XML metadata

Show full item record
Export via OAI-PMH Interface in XML Formats
Export to Other Non-XML Formats

Page view(s)

34
checked on Dec 11, 2019

Download(s)

6
checked on Dec 11, 2019

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.