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Defining upper critical temperatures for an effective climate control to reduce heat stress CIGR Journal
Sanz, Salvador Calvet.
The definition of homeotherm animal responses to temperature has traditionally based on metabolic and thermal physiology studies. The thermoneutral zone is defined as the range of ambient temperature within which metabolic rate is at a minimum, and within which temperature regulation is achieved by non-evaporative physical processes alone. As temperature raises, animals the upper critical temperature is reached, which is the ambient temperature above which thermoregulatory evaporative heat loss processes of a resting thermoregulating animal are recruited. These temperatures depend on a variety of factors including animal species and breed, age, adaptation or animal status, among others. These are influenced by other environmental conditions such as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal Production Heat stress; Precision livestock farming; Critical temperature; Welfare; Indicators; Climate control.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4782
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Effectiveness of horizontal air flow fans supporting natural ventilation in a Mediterranean multi-span greenhouse Scientia Agricola
López,Alejandro; Valera,Diego Luis; Molina-Aiz,Francisco Domingo; Peña,Araceli.
Natural ventilation is the most important method of climate control in Mediterranean greenhouses. In this study, the microclimate and air flow inside a Mediterranean greenhouse were evaluated by means of sonic anemometry. Experiments were carried out in conditions of moderate wind (≈ 4.0 m s-1), and at low wind speed (≈ 1.8 m s-1) the natural ventilation of the greenhouse was supplemented by two horizontal air flow fans. The greenhouse is equipped with a single roof vent opening to the windward side and two side vents, the windward one being blocked by another greenhouse close to it, while the leeward one is free of obstacles. When no fans are used, air enters through the roof vent and exits through both side vents, thus flowing contrary to the thermal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate control; Microlimate; Sonic anemometry.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400001
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Heat and moisture production in growing-finishing pigs and broilers CIGR Journal
Aarnink-FBC, Andre.
Heat and moisture production are important parameters for designing ventilation and climate control systems in livestock housing. In 2002 a report was published of the CIGR Section II Working Group on Climatization of Animal Houses ‘Heat and moisture production at animal and house levels’ with formula to calculate heat and moisture production for different livestock categories. The objective of this paper is to discuss these CIGR formula for growing-finishing pigs and broilers. Results from calculated heat and moisture production with the relatively simple formula in the CIGR report were compared with results from a more comprehensive model. From this comparison the following conclusions were drawn: 1) The relatively simple CIGR formula to calculate total...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Livestock housing; Climate control; Heat production; Moisture production; Sensible heat; Latent heat; Pigs; Poultry.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4781
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