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Orientador: Paulo César Razuk / Banca: Augusto Ronchi Junior / Banca: Waldemar Gastoni Venturini Filho / Resumo: O produtor de leite de cabra, com o apoio e incentivo de entidades governamentais, privadas e ONGs; agrega tecnologia ao leite garantindo uma melhor distribuição de renda e qualidade de vida, fixando-se cada vez mais no campo. O resfriamento do leite após a ordenha é a melhor medida para retardar a proliferação natural das bactérias e sua temperatura deverá ser reduzida de 36 ºC para 4 ºC no período máximo de 2 horas em cada ordenha. O tempo transcorrido entre a primeira ordenha e seu recebimento na usina de beneficiamento deverá ser, no máximo, de 48 horas. Neste trabalho propõe-se projetar e analisar tanques de resfriamento de leite com capacidades úteis de 320, 500 e 2000 litros em aço inoxidável austenítico AISI 304, utilizando-se do coeficiente global médio (U) e das temperaturas médias de saturação do fluido de refrigeração (X) obtidos em ensaios experimentais. Um objetivo secundário foi verificar a possibilidade da utilização de caixas d'água de polietileno com a mesma capacidade dos tanques, por ser um produto acessível, de baixo custo e que atende as exigências sanitárias, visando obter um produto que possa substituir o aço inoxidável, mas descartou-se esta possibilidade, pois o fundo plano destas caixas dificultaria a retirada do produto e a limpeza. Nos cálculos envolvidos na geometria para a construção dos tanques, utilizou-se da relação entre a altura cilíndrica e o diâmetro que contemplasse respectivamente, o número... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The goat milk producer, with support and encouragement of governmental and private agencies as well as NGOs, aggregate technology to milk production ensuring a better distribution of income and life quality for all his family, making it possible the maintenance of the country life. The milk cooling ater the milking process is the best alternative to delay the natural proliferation of bacteria. The milk temperature should be reduced from 36 ºC to 4 ºC in a maximum period of time of two hours for each milking. The elapsed time between the first milking and the milk delivery in the processing plant shall be at most 48 hours. In this work, we propose to design and analyze milk cooling AISI 304 austenitic stainless ateel 320, 500 and 2000 liters tanks, using the mean global coefficient (U) and mean saturation temperatures of the refrigeration fluid (X), obtained experimentally. Besides stainless steel built tanks, accessible low cost polyethylene watertanks, with same dimensions of the steel tanks, attending the necessary sanitary requirements were used, aiming for an alternative product that can replace stainless steel. However, this possibility was rejected, because its flat basis would make it hard the product removal and its cleaning. During the geometric calculations in the manufacturing of the tanks, the relationship betwwen the cylindrical height and the diameter was defined in order to provide the golden ratio and batch square... (Complete abstract click electronic access below) / Mestre

Made available in DSpace on 2014-06-11T19:25:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-03-24Bitstream added on 2014-06-13T18:26:32Z : No. of bitstreams: 1 salvadeo_vm_me_bauru.pdf: 454404 bytes, checksum: f9533c97cafb5b981d239b02a0bf9213 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O produtor de leite de cabra, com o apoio e incentivo de entidades governamentais, privadas e ONGs; agrega tecnologia ao leite garantindo uma melhor distribuição de renda e qualidade de vida, fixando-se cada vez mais no campo. O resfriamento do leite após a ordenha é a melhor medida para retardar a proliferação natural das bactérias e sua temperatura deverá ser reduzida de 36 ºC para 4 ºC no período máximo de 2 horas em cada ordenha. O tempo transcorrido entre a primeira ordenha e seu recebimento na usina de beneficiamento deverá ser, no máximo, de 48 horas. Neste trabalho propõe-se projetar e analisar tanques de resfriamento de leite com capacidades úteis de 320, 500 e 2000 litros em aço inoxidável austenítico AISI 304, utilizando-se do coeficiente global médio (U) e das temperaturas médias de saturação do fluido de refrigeração (X) obtidos em ensaios experimentais. Um objetivo secundário foi verificar a possibilidade da utilização de caixas d'água de polietileno com a mesma capacidade dos tanques, por ser um produto acessível, de baixo custo e que atende as exigências sanitárias, visando obter um produto que possa substituir o aço inoxidável, mas descartou-se esta possibilidade, pois o fundo plano destas caixas dificultaria a retirada do produto e a limpeza. Nos cálculos envolvidos na geometria para a construção dos tanques, utilizou-se da relação entre a altura cilíndrica e o diâmetro que contemplasse respectivamente, o número... / The goat milk producer, with support and encouragement of governmental and private agencies as well as NGOs, aggregate technology to milk production ensuring a better distribution of income and life quality for all his family, making it possible the maintenance of the country life. The milk cooling ater the milking process is the best alternative to delay the natural proliferation of bacteria. The milk temperature should be reduced from 36 ºC to 4 ºC in a maximum period of time of two hours for each milking. The elapsed time between the first milking and the milk delivery in the processing plant shall be at most 48 hours. In this work, we propose to design and analyze milk cooling AISI 304 austenitic stainless ateel 320, 500 and 2000 liters tanks, using the mean global coefficient (U) and mean saturation temperatures of the refrigeration fluid (X), obtained experimentally. Besides stainless steel built tanks, accessible low cost polyethylene watertanks, with same dimensions of the steel tanks, attending the necessary sanitary requirements were used, aiming for an alternative product that can replace stainless steel. However, this possibility was rejected, because its flat basis would make it hard the product removal and its cleaning. During the geometric calculations in the manufacturing of the tanks, the relationship betwwen the cylindrical height and the diameter was defined in order to provide the golden ratio and batch square... (Complete abstract click electronic access below)

Master of Agribusiness / Department of Agricultural Economics / Arlo Biere / The objective of this thesis is to examine the factors that a producer will want to consider when choosing the milk cooling and storage system for the dairy farm. The two systems studied are the traditional, on-farm, bulk tank system and the more recently developed, direct tanker loading system that uses glycol chilling plates. As a long-term investment, the choice of the refrigeration and storage system will have an impact on at least four dimensions of the dairy business. The capital cost of the milk cooling/storage system can range from 2% to 5% of the total capital investment in the farm. Milk cooling costs can also account for as much as 25% of the farm’s total electric costs. The system selected can also have an impact on the hauling charges and the hauling charges can account for as much as 10% of the dairy’s gross revenue. Lastly, the storage system selected may influence the range of markets available to the producer as not all processors accept milk from farms using direct tanker loading. Using an economic engineering approach, three hypothetical farm sizes were considered: milking 700, milking 1,400, and milking 2,100 cows. Capital and operating cost data were collected from three major dairy equipment manufacturers that service the Upper Midwest. Capital expenses for each size farm were priced for conventional bulk tanks and then also priced for glycol plate chiller systems that load directly into tanker trailers. The comparison of annualized costs of ownership for all three farm sizes shows only minor differences in the two systems. For the 700 cow farm, a direct tanker loading system saved 0.24% over the total capital investment; for the 1,400 cow farm, a direct tanker loading system saved 0.97%; and for the 2,100 cow farm, a direct tanker loading system saved 1.19%. Thus, differences in hauling charges, which will vary with each situation, become critical to the choice. Because the overall cost of the two systems are so close, one can expect that the peripheral and non-economic issues may be much more influential on each producer’s decision. Given the known differences in hauling charges, one can conclude that for the 700 cow farm, conventional tanks would be the preferred choice. For the 1,400 cow farm and the 2,100 cow farm, the determining factors come down to the differences in hauling charges and long-term goals for the farm business.