Effect of construction shape and materials on indoor microclimatic conditions inside the cowsheds in dairy farms
Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, CZ165 21 Prague, Czech Republic
The aim of this paper is to present the results of microclimatic research focused on the indoor conditions in cowsheds and milking parlours in two dairy farms. The attention is paid mainly to the construction and materials used for buildings, which can influence together with technological equipment and system of ventilation the microclimatic conditions inside the cowsheds. In the frame of this research main parameters of internal and external properties of climate (air temperature, humidity, globe temperature, THI, BGHI and concentration of CO2) during the hot summer were measured and evaluated. Results of long time and short time measurements show very important role of used materials and shape of buildings. The research results show that the use of principles of passive air conditioning can contribute significantly to the improvement of internal microclimate. Reduced amplitude of temperature oscillation was 42.4% of amplitude of outside air temperature in cowshed with massive construction and 91.7% in modern light building. The average phase shift of temperature oscillations, expressed as a time delay of internal temperature rise behind the external temperature rise was about 2.8 hours and time delay of drop of internal temperature behind external temperatures drop was 3.3 hours in massive cowshed. The same parameters in modern light cowshed were only 1.1 hours and 0.5 hours.