Custo energético de construção de uma instalação para armazenagem de feno

Abstract

O trabalho teve como objetivo obter uma estimativa da energia empregada na construção de uma estrutura utilizada para armazenamento de fardos de feno, em um sistema de produção animal. Para tanto utilizaram-se os coeficientes energéticos levantados pela Fundação Centro Tecnológico de Minas Gerais (CETEC). O valor obtido foi de 587,09 MJ.m-2, o qual foi amplamente diferente daqueles observados na literatura. Da energia total empregada na construção da instalação os itens fechamentos, estrutura de cobertura, piso e fundações representaram 50,35, 27,71, 18,72 e 3,22%, respectivamente. Considerando o sistema de produção de feno de alfafa e "coast-cross" como um todo, a instalação contribuiu com somente 0,14 e 0,16% da composição do custo energético anual destas culturas, respectivamente.

Energetic efficiency of a deep bed swine production system

“…These results are corroborated by ANGONESE et al (2006), & SANTOS & LUCAS JUNIOR (2004) and SOUZA et al (2009) that also showed higher consumption in the category of direct energy. In Table 6, it is shown the preponderance of direct energy through ration (80.57%) used as animals´ food.…”

“…For this same parameter, ANGONESE et al (2006) have evaluated the energy efficiency of such system in the finishing phase and have found out that the ration represented 95.28% of the total direct energy. In that same line of thought, SANTOS & LUCAS JUNIOR (2004) worked with the energy balance in broiler sheds and also showed that the diet was the largest component of energy intake, representing 86.50% of all the energy consumed directly by farming system.…”

“…SANTOS & LUCAS JUNIOR (2004) reported that wood shavings used as bedding accounted for 10.2% of the total direct energy invested in a broiler shed.…”

“…Moreover, concerning the use of fuels and lubricants, working with forage crops CAMPOS et al (2005) and CAMPOS et al (2004) observed that fuels and lubricants, respectively, 75.05 and 59.61% of the total energy consumption, assuming greater contribution in the direct energy of the systems studied.…”

“…On the other hand, the energy of organic fertilizer in the swine deep bed format was determined by using bomb calorimeter PARR 1261, according to the methodology described in SANTOS & LUCAS JÚNIOR (2004), where we got the value of 14.55 MJ kg -1 . Based on the coefficients of energy input and output, for the calculations of the energy conversion of some energy components involved in the production shed for swine deep bed, we have used the equations contained in SANTOS & LUCAS JUNIOR (2004) …”