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A COMPUTER MODEL FOR OPTIMISATION OF THE INTERNAL CLIMATE IN ANIMAL HOUSING DESIGN
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Proceedings of the Seventh International Symposium, 18-20 May 2005 (Beijing, China) Publication Date 18 May 2005 701P0205.(doi:10.13031/2013.18351)
Authors: P.Liberati, P. Zappavigna
Keywords: animal housing, climate control, simulation model
Climate control is essential in animal production, but building parameters concerning the internal
climate may not always be reliable if calculated in a conventional stationary way. As an aid for
design, a software tool has been developed to simulate the transitory climatic conditions inside
closed buildings such dairy cow barns or pig houses.
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Main program inputs were: wall, roof and floor material layers (including insulating air
interspace), building orientation, opening specifications (size and position), overall geometrical
dimensions, kind of breeding, latitude and longitude. Furthermore wind speed and direction were
considered. The program output concerns heat balance (sensible and latent) and temperature
humidity index over the day. The simulation model accounted for the daily sun path, the eventual
roof shadowing on the walls, and the water evaporation from the floor and the manure. Heat
transmission through walls was calculated by the finite difference method. Natural ventilation
has been evaluated numerically calculating firstly the neutral plane, and then calculating the air
flow at each time step due to buoyancy and wind effects (this last using the pressure coefficients
method). The model had been validated through a comparison between the calculated internal air
temperature and humidity and real values measured in a house for fattening pigs.
The complete simulation of internal climate permits the optimisation of the thermal performance
of the buildings during the whole year. This allows a means to reach the best compromise (in
terms of building design) between the opposite requirements of the cold winter and hot summer