Zoneamento do potencial de uso de sistemas de resfriamento evaporativo no sudeste brasileiro

Carvalho, Valcimar Ferreira de; Yanagi, Tadayuki; Ferreira, Leandro; Damasceno, Flávio Alves; Silva, Mariano P.

doi:10.1590/s1415-43662009000300020

Cited by 11 publications

(11 citation statements)

References 9 publications

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“…In the cities of the bioclimatic zone 8, mechanical ventilation is required during the whole day, and also for the most part at night, due to its always warm environment, demanding greater energy consumption for this purpose. Especially, in the zones of high temperature throughout the day, the use of evaporative cooling systems is feasible, in order to reduce the temperature to values close to the temperature of the wet bulb and thus obtain a higher efficiency [12,13]. It must be considered that this system is only restricted to Af climates (as in the case of Salvador -BA), due to having high relative humidity during the greater part of the year [16].…”

Section: Resultsmentioning

confidence: 99%

“…In Brazil, during the chickens phase in cold conditions, producers choose to close the broiler barns and only perform minimum ventilation [11], since the productive performance of the chicken behaves better in "cold" environments. The reason is that the thermoregulatory system is better adapted to retain heat than to dissipate it [13], thus, in general, heating is not done in the adult phase.…”

Section: Resultsmentioning

confidence: 99%

“…However, this effect is null when the temperature of the dry bulb is equal to the body temperature of the bird, and there is a need to use evaporative cooling methods. The use of these systems allows the reduction of the temperature of the dry bulb up to 11°C in some regions, particularly in Brazil, the average of this reduction is 6°C [12][13][14]. The evaporative cooling systems have been used in thermal environmental control applications to improve human, plant and animals comfort conditions [15].…”

Section: Introductionmentioning

confidence: 99%

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Comfort and energy consumption in a hybrid tunnel-type broiler barn in different bioclimatic zones of Brazil

Hernandez

Guerra-García

Folgôa-Baptist

2019

DYNA

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Poultry production is influenced directly by its environmental conditions and, therefore, the conditions of comfort, animal welfare, and energy consumption of the facilities. The objective of this study was to carry out an assessment of the climatization needs of a negative pressure ventilated broiler barn in 12 Brazilian cities, located in the 8 bioclimatic zones of the country. It was found that, cities located in bioclimatic zones 1 and 2 require a higher energy consumption for heating during the chicks phase (0-21 days), while zones 7 and 8 require more energy for cooling during the chickens phase (22-42days). The cities located in zones 3, 4, 5 and 6 present the best comfort conditions and the greatest energy savings for the two phases.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comfort and energy consumption in a hybrid tunnel-type broiler barn in different bioclimatic zones of Brazil

Hernandez

Guerra-García

Folgôa-Baptist

2019

DYNA

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“…Segundo Carvalho et al (2009), regiões com altos valores de temperatura do ar associados aos das altas umidades relativas, são limitantes ao uso de sistemas de resfriamento evaporativo, porém durante os meses mais quentes e menos úmidos os sistemas de resfriamento evaporativo, apresentam melhor desempenho.…”

Section: Resultsunclassified

Uso do sistema de resfriamento adiabático evaporativo no conforto térmico de vacas da raça girolando

Almeida

Pandorfi

Guiselini

et al. 2011

Rev. bras. eng. agríc. ambient.

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RESUMOObjetivou-se, com esta pesquisa, avaliar diferentes tempos de exposição dos animais à climatização no curral de espera sobre os índices de conforto, parâmetros fisiológicos e produção de leite de vacas girolando 7/8. Consideraram-se tratamentos quatro tempos de exposição dos animais ao sistema de resfriamento adiabático evaporativo (SRAE), 0, 10, 20 e 30 min. O experimento foi realizado durante a estação de verão, com duração de 56 dias. Utilizaram-se 16 vacas com produção média de 18 kg de leite d -1, adotando-se delineamento em quadrado latino 4 x 4. A temperatura de bulbo seco (Tbs, °C) e a umidade relativa (UR, %), foram registradas a cada minuto o que permitiu determinar a eficiência do SRAE por meio do índice de temperatura e umidade (ITU) e entalpia (h). A frequência respiratória (FR), temperatura retal (TR) e temperatura de pelame (TP), foram medidas antes e depois da climatização. O tratamento 30 min permitiu manter as variáveis ambientais e os índices de conforto dentro dos limites recomendados. As variáveis fisiológicas (FR, TR e TP) mostraram valores inferiores no tratamento 30 min, o que refletiu positivamente na produção de leite, com aumento de 4,4%, quando comparado com o tratamento 0 min. Palavras-chave: ambiência, biometeorologia animal, bovinos leiteirosUse of adiabatic evaporative cooling system in thermal comfort of Girolando cows ABSTRACT The objective of this research was to evaluate different times of exposure of animals to cooling in the waiting pen on the comfort index, physiological parameters and milk production of girolando 7/8 cows. As treatments, four times of exposure of animals to adiabatic evaporative cooling system (AECS), 0, 10, 20 and 30 min were considered. The experiment was conducted during the summer season and lasted 56 days. Sixteen cows were used with an average daily milk production of 18 kg, distributed in 4 x 4 Latin square design. The dry bulb temperature (DBT) and relative humidity (RH) were recorded every minute, which allowed to determine the efficiency of the AECS through the Temperature and Humidity Index (THI) and enthalpy (h). The respiratory rate (RR), rectal temperature (RT) and temperature of the coat (TC) were measured before and after cooling. The 30 min treatment kept the environmental variables and the comfort indexes within recommended limits. The physiological variables (RR, RT and TC) were lower in the 30 min treatment and reflected positively on milk production, which increased 4.4% compared to the 0 min treatment.

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“…As the T air outside the poultry house was 34.5 ºC, the evaporative pads contributed to the average cooling of 7.3 ºC. Franco et al (2011) and Carvalho et al (2009) state that air cooling by evaporative pads can lead to a reduction of up to 11 ºC compared to the external temperature.…”

Section: Methodsmentioning

confidence: 99%

Diagnosis and validation by computational fluid dynamics of poultry house with negative pressure ventilation

Cunha

Lopes

Furtado

et al. 2019

Rev. bras. eng. agríc. ambient.

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Negative pressure ventilation in poultry houses has been used to enable the correction of their internal microclimates, and studies point to the heterogeneous distribution of air along the aviaries and the inadequacy of the environmental variables to the recommended ranges for thermal comfort of adult birds, especially in the hottest hours of the day. This study aimed to diagnose the facilities of a poultry house in the state of Paraíba, Brazil, regarding the distribution of environmental variables and thermal comfort; develop a computational model and validate it for Computational Fluid Dynamic - CFD simulations. Air temperature (Tair), air relative humidity (RH) and air velocity (Vair) data allowed characterizing the internal environment by comparison with the recommended ranges for each variable and by the temperature-humidity-velocity index (THVI). The poultry house does not provide comfort for the housed adult birds, between 12 and 14 h, with THVI indicating alert and Tair, RH and Vair values outside the recommended ranges; the CFD model for the poultry house was validated with Tair averages collected in the field of 27.75 ± 1.35 ºC and simulated of 27.85 ± 0.55 ºC, mean values of RH collected of 83 ± 12% and simulated of 78 ± 3%, and means of Vair collected of 2.35 ± 1.35 m s-1 and simulated of 2.50 ± 1.50 m s-1.

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Zoneamento do potencial de uso de sistemas de resfriamento evaporativo no sudeste brasileiro

Cited by 11 publications

References 9 publications

Comfort and energy consumption in a hybrid tunnel-type broiler barn in different bioclimatic zones of Brazil

Comfort and energy consumption in a hybrid tunnel-type broiler barn in different bioclimatic zones of Brazil

Uso do sistema de resfriamento adiabático evaporativo no conforto térmico de vacas da raça girolando

Diagnosis and validation by computational fluid dynamics of poultry house with negative pressure ventilation

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