Using meteorological data to determine the risk of heat stress
A mathematical model of thermodynamic changes in the moist air inside a stable was designed using a computer program called MathCAD. Calculations of air temperature and humidity were carried out in poultry houses with layer hens. They were based on outdoor air characteristics and hens' biologic...
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| Vydané v: | Research in Agricultural Engineering (Praha) Ročník 52; číslo 2; s. 39 - 47 |
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| Hlavní autori: | , |
| Médium: | Journal Article |
| Jazyk: | English |
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Prague
Czech Academy of Agricultural Sciences (CAAS)
01.06.2006
Czech Academy of Agricultural Sciences |
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| ISSN: | 1212-9151, 1805-9376 |
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| Abstract | A mathematical model of thermodynamic changes in the moist air inside a stable was designed using a computer program called MathCAD. Calculations of air temperature and humidity were carried out in poultry houses with layer hens. They were based on outdoor air characteristics and hens' biological production. Meteorological data were monitored hourly from May to August during the years 2000 to 2002. The calculated values were used to assess the potential of evaporation cooling in mild climatic conditions. The model may also be used to calculate the time the animals spend at a certain temperature before it is lowered by cooling. For example, in June 2002, the time the animals were exposed to 27 deg C was reduced from 39 to 22 h, and in July, it was from 33 to 4 h. |
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| AbstractList | This paper first proposes a technique of computing air temperature and humidity in stables based on outdoor air parameters and biological production of animals. The computation technique is outlined. The calculated values are then used to assess the potential of evaporation cooling in mild climatic conditions. Graphs illustrate the assumed effect of evaporation cooling equipment inside a stable housing of egg laying hens. Used in the computation were hourly meteorological readings obtained during the period May to August in years 2000 to 2002, in the locality with a potential installation of a cooling system. Other Graphs illustrate the time the animals spent in an environment with a particular air temperature. For instance in June 2002, the time animals in the stable were exposed to temperatures 27°C or higher was reduced by using an air cooling system from 39 h to 22 h, and in July 2002 from 33 h to 4 h. The envisaged model can be modified for other kinds of gallinaceous poultry and pigs. A mathematical model of thermodynamic changes in the moist air inside a stable was designed using a computer program called MathCAD. Calculations of air temperature and humidity were carried out in poultry houses with layer hens. They were based on outdoor air characteristics and hens' biological production. Meteorological data were monitored hourly from May to August during the years 2000 to 2002. The calculated values were used to assess the potential of evaporation cooling in mild climatic conditions. The model may also be used to calculate the time the animals spend at a certain temperature before it is lowered by cooling. For example, in June 2002, the time the animals were exposed to 27 deg C was reduced from 39 to 22 h, and in July, it was from 33 to 4 h. |
| Author | Neuberger, P.(Ceska Zemedelska Univ., Prague (Czech Republic). Technicka Fakulta) Sleger, V.(Ceska Zemedelska Univ., Prague (Czech Republic). Technicka Fakulta) E-mail:sleger@tf. czu.cz |
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| Cites_doi | 10.13031/2013.30798 10.1017/S0003356100023266 10.1006/jaer.2000.0550 10.13031/2013.40457 10.1038/207415a0 |
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| References | Silva (ref9) 2005 ref4 ref6 Black (ref1) 1986; 3 ref5 ref0 Chyský (ref3) 1977; 73 ref2 (ref7) 1990 |
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| SubjectTerms | ACONDICIONAMIENTO DE AIRE air AIR CONDITIONING Air cooling air humidity AIR TEMPERATURE ALOJAMIENTO PARA AVES Animal production Animals biological production Climatic conditions CLIMATISATION Computation CONTROL AMBIENTAL CONTROLE DU MILIEU COOLING Cooling systems DESEMPENO EN LA POSTURA Egg laying eggs ENFRIAMIENTO ENVIRONMENTAL CONTROL ESTRES TERMICO EVAPORACION EVAPORATION evaporation cooling Evaporative cooling GALLINA PONEDORA GALLINAS Graphs HEAT STRESS Heat tolerance HENS HUMEDAD RELATIVA HUMIDITE RELATIVE humidity LAYER CHICKENS laying hens LAYING PERFORMANCE LOGEMENT DES VOLAILLES MATHEMATICAL MODELS Meteorological data MODELE MATHEMATIQUE MODELOS MATEMATICOS PERFORMANCE DE PONTE POULE PONDEUSE POULETTE POULTRY HOUSING REFROIDISSEMENT RELATIVE HUMIDITY risk STRESS THERMIQUE TEMPERATURA DEL AIRE TEMPERATURE DE L'AIR temperature-humidity index VENTILACION VENTILATION |
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| Title | Using meteorological data to determine the risk of heat stress |
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