Temperature and humidity regime of the uninsulated cowshed

Abstract

Having carried out the literature analysis it has been established that the relative air humidity in spacious cowsheds is often high and even exceeds the relative air humidity outside by 15 %. It is considered that the reason for high humidity is inadequate ventilation in the cowshed. The work objective is to substantiate reasoned values of temperature and humidity regime in a cowshed which are necessary in designing and operating a ventilation system. Analytical and experimental research methods have been applied using the principles of thermophysics. An equation relating relative humidity in a cowshed with the temperature difference between the inside and outside air has been drawn. Another equation showing the biggest allowed temperature difference to prevent condensation of water vapour on the internal surface of external barriers has been drawn. Analytical and experimental research has substantiated that probable minimum relative humidity in a cowshed is about 5 % lower than relative humidity outside. The reasoned temperature difference between the inside and outside air during cold season is about 4 °C, when the heat transfer rate of walls and roof was 4.5 W/(m2-K).