Neapšiltintos Karvides Optimalus Temperatūrinis‐dregmes Režimas

Kavolėlis, B.; Bleizgys, Rolandas

doi:10.3846/16486897.2006.9636884

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The constant body temperature of the animal ensures the normal functioning of its body. However, this process can be disrupted if the animal lays on a cold floor (Sallvik, 1998;Kavolelis, Bleizgys, 2006). In this case, the animal is subject to dual environmental conditions to which its body can not fully adapt, i.e.…”

Section: Introductionmentioning

confidence: 99%

The Regime of Cowshed Environment and Ground Soils Temperature

Šadzevičius

Gurskis

Skominas

et al. 2018

Proccedings of International Scientific Conference "RURAL DEVELOPMENT 2017"

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The quantity and quality of milk depends not only on milking or milk storage equipment but also on cow's well-being. A cow lying on the animal bed gives a certain amount of heat, as intense heat exchanges occur on the ground through the floor. When lying, the blood in the cow's udder flows more intensely. It is known that for the formation of one liter of milk 500 liters of blood should flow through the cow's udder. The amount of milk is highly dependent from the micro-climate of the animal's bed, during the rest of the cow. The poorly installed or inappropriately designed bearing bed's floors do not meet the physiological needs of the animals from a thermal point of view, much more energy loss occurs. Often there are cases where cold-frozen animals suffer from various cold diseases and their productivity decreases. Therefore, no less attention should be paid to the cow's bed floor. The article analyses the temperature regime of the base of the cowshed and the ground of its environment during the regular period. The structure of the cowshed building is energy-heated, with bearing vault structures. Cows are kept tied up in re-bars. The floor of the cowshed room is installed on the ground. The ground floor temperature is fixed in 3 boreholes under the floor and also in 3 wells near the cowshed ground. Temperatures were fixed up to 6 meters deep. The fields of distribution of the base of the cowshed and its ground temperature are established during the regular period. Analysis of the temperature of the base of the cowshed and its environment showed that the ground temperature is influenced by the amount of heat released by the animal, which transmits itself not only to the room, but also to the base ground through the floor of the bearing bed. Since the bed's floor is installed on the ground, the amount of heat loss caused by the animal through the floor depends not only on the thermal properties of the floor, but also on the base ground temperature regime. Extremely intense heat exchanges through the base ground occur during the coldest period of the year.

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Section: Introductionmentioning

confidence: 99%

The Regime of Cowshed Environment and Ground Soils Temperature

Šadzevičius

Gurskis

Skominas

et al. 2018

Proccedings of International Scientific Conference "RURAL DEVELOPMENT 2017"

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Natural Ventilation of Animal Sheds Due to Thermal Buoyancy and Wind/Natūralus Tvarto Vėdinimas Veikiant Gravitacinei Ir Vėjo Traukai/Воздухообмен Животноводческого Помещения Под Действием Тепловых Избытков И Ветра

Kavolėlis

Bleizgys²,

Čėsna³

2008

Journal of Environmental Engineering and Landscape Management

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Journal of Environmental Engineering and Landscape ManagementPublication details, including instructions for authors and subscription information:Abstract. In designing a natural ventilation system for animal sheds it is necessary to assess the ventilation induced by thermal buoyancy and wind forces during different seasons and under different animal housing conditions. By applying analytical and experimental investigation a methodology was prepared to establish ventilation intensity caused by thermal buoyancy and wind and data were achieved on thermal buoyancy and wind values and their relationship. The innovation of the methodology can be described by the fact that a simple equation was formed to calculate the air speed in inlet and outlet openings, a mathematical expression of thermal buoyancy and wind ratio was achieved and the required inlet opening area to let in fresh air compared with the outlet opening area to let out polluted air was substantiated to ensure that all polluted air is removed through a rooftop open in winter. It was calculated that the average air speed in the rooftop outlet opening of a typical cold-type cowshed is 1.3 m/s (when there is no wind, this speed decreases to 0.3 m/s), thermal buoyancy and wind ratio is 0.27 and in order to have all polluted air removed through the rooftop open in winter the inlet opening area in the walls must not exceed 40% of the rooftop opening area. The accuracy of the prepared methodology was tested under natural conditions of barn operation when the distance between air inlet openings and outlet openings was 6.5 m. During the investigation indoor and outdoor temperatures, air speed in the outlet and wind speed were measured. During the experiments the difference of indoor and outdoor temperatures varied from -2 to +16 o C and air speed in the outlet -from 1.2 to 1.9 m/s. The analytical results reflect the mean values of experimental data under natural conditions of operation rather accurately. The difference between the experimental and calculated air speed values in the outlet opening was insignificant and was within 0-8% range.

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Neapšiltintos Karvides Optimalus Temperatūrinis‐dregmes Režimas

Cited by 2 publications

References 4 publications

The Regime of Cowshed Environment and Ground Soils Temperature

The Regime of Cowshed Environment and Ground Soils Temperature

Natural Ventilation of Animal Sheds Due to Thermal Buoyancy and Wind/Natūralus Tvarto Vėdinimas Veikiant Gravitacinei Ir Vėjo Traukai/Воздухообмен Животноводческого Помещения Под Действием Тепловых Избытков И Ветра

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