Neiton Silva Machado

ASPERSÃO DE ÁGUA DE CHUVA ARMAZENADA SOBRE A COBERTURA DE AVIÁRIOS COM TELHAS DE AÇO NA REGIÃO CENTRO OESTE DO BRASIL

Objetivou-se com este trabalho estudar os principais efeitos da aspersao de agua de chuva armazenada sobre a cobertura de telhas de aco de instalacoes comerciais para producao de frangos de corte, na regiao centro-oeste do Brasil. Foram avaliados variaveis climaticas, temperatura da superficie inferior das telhas, indices zootecnicos e indices de conforto termico. Adicionalmente, foram avaliados o tempo de funcionamento, o consumo de agua e o consumo de energia pelo sistema de resfriamento. O delineamento experimental foi inteiramente casualizado com dois tratamentos e tres repeticoes: Tratamento um - tres aviarios equipados com sistema de resfriamento interno, modo tunel com pressao negativa, e aspersao de agua de chuva armazenada sobre a cobertura de telhas de aco (CA); Tratamento dois - tres aviarios identicos aos do tratamento 1 embora, sem aspersao de agua sobre a cobertura (SA). O tratamento CA, em media, proporcionou a reducao de 19,5°C na temperatura media da superficie interna das telhas no horario mais critico do dia as 15:00h e reduziu a temperatura media do ambiente ao nivel das aves em 1,9 °C. Ademais, os indices de conforto termico no tratamento CA apresentaram valores inferiores durante todo periodo experimental, houve reducao no tempo de funcionamento do segundo grupo de exaustor em 4,8 %, no terceiro grupo em 7,5 % e na bomba de nebulizacao interna em 9,6 %, reduzindo assim o consumo de energia eletrica, reducao na mortalidade, melhoria na conversao alimentar e aumento no ganho de massa corporal media das aves ao abate

AVALIAÇÃO DO CONJUNTO MOTOR GERADOR MONOFÁSICO ALIMENTADO COM BIOGÁS PURIFICADO DA FERMENTAÇÃO ANAERÓBIA DE DEJETOS DE SUÍNOS - DOI: 10.13083/1414-3984.v22n04a04

The generation of electricity using organic residue from animal production farms is not very well known in Brazil. Therefore, the objective of this study was to evaluate the technical feasibility of using a 30 kVA monophase generator engine set in order to generate electricity by the combustion of purified biogas. It was used three physicochemical processes for removing hydrogen sulphide, which were wet filtration (0.1 m3 H2O + 20 kg of CaO and 10 kg of charcoal); dry filtering (50 kg flat wire annealed No. 06 and 10 kg of charcoal) and filtering in series (wet filtering followed by dry filtering), fillings the filters with the same proportions. Performance of the generator engine set was evaluated as a function of operating time. Based on the results, it could be concluded that on average the filtering systems reduced emission of SO2 and CH4 of the generator engine set and maintained emission of H2S. The wet filtering with calcium hydroxide resulted in the highest theoretical and observed yields for the generator engine set set, which were 29% and 12%, respectively.

Evaluation of a system of roof cooling in broiler sheds in the Brazilian central-west.

The use of captured rainwater to evaporatively cool roofs is an interesting alternative for the sustainable development of broiler production. Alleviating heat stress contributes to better results in the productive performance of the animals. The objective of this research was to evaluate the efficiency of a roof evaporative cooling system in promoting environmental thermal comfort and productive performance of broilers chickens. The energy savings due to roof evaporative cooling was also determined. This work was carried out in the Company Perdigao Agroindustrial S/A - Brazil, during the final phase of life of the birds. Six broiler sheds were equipped with internal misting systems and tunnel ventilation, and three of these were also equipped with additional cooling via evaporative roof cooling. Each house held 22,700 broilers of the Cobb line, with a density of 14 broilers per m2. The maximum reduction of the interior air temperature at the level of the birds was 1.9 oC, when the maximum temperature of external air reached 29.8 oC. The black globe humidity index (BGHI) ranged from 77 to 86, at the birds’ level. The reduction in operation of exhaust fans was up to 7.5% and in misting cooling pump was up to 9.6%, in the three houses. The water consumption was approximately 5,865 L/h. The system also provided reduction in the mortality of the birds 2.03%, improved feed conversion efficiency of 0.14, and increased the average body mass of broilers by 0.109 kg per animal.