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Encontro de Energia no Meio Rural



Abstract

OLIVEIRA, Celso Eduardo Lins de, PLAZA, Saturnino de La and GARCIA, José Luis. Simulações do custo de energia para calefaçã0 em casas de vegetação para cinco cidades brasileiras. In Procedings of the 5th Encontro de Energia no Meio Rural, 2004, Campinas (SP) [online]. 2004 [cited 30 May 2024]. Available from: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022004000200043&lng=en&nrm=iso> .

Using the values of the global heat loss coefficient (U) calculated with the equations of the lineal model developed by OLIVEIRA (2003), and with the 30 year-old values, the energy can be calculated by square meter that would be necessary to obtain a temperature set point of 15ºC, to a greenhouse of 132 m2. They were chosen the cities of Cascavel, Curitiba, Florianópolis, Porto Alegre and São Paulo. To each place the medium day of the months was used to determine the convenience of the heating that the minimum average went under 15ºC. Observing the medium minimum temperatures is easy to verify that the support of alone heat would be justified for a crop with high energy need and excellent commercial value, as it can be the case of the crop of some ornamental species. The value of estimated energy was multiplied by the euros cost for Kwh for fuel-oil, natural gas and diesel, being simulate the heating use for heat fan and radiant floor, combined or not with two techniques of energy saving: use a double layer or plastic tunnel over the crop. Should even consider that in all the chosen places frost risk exists, what can influence in the profitability of many crops. The city of Florianópolis went to that presented smaller thermal solicitations and, therefore smaller costs, the city of Curitiba already demonstrated the needs of a support system for eight months and, therefore, larger costs. The technical more efficient it is the use of combined radiant floor with plastic tunnel, being the combustible more economic is fuel-oil.

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