Resumo

LOPEZ S, Maiquel; MUJICA C, Albi  e  DUARTE N, Leonel. Approach on the mathematical formulation for the calculation of the losses for evaporation and haulage in low pressure trasmitters. Rev Cie Téc Agr [online]. 2011, vol.20, n.2, pp. 65-69. ISSN 2071-0054.

In this work it was carried out a theoretical-practical study in a test bank outdoors with the low pressure transmitter that the machines of central pivot, Spray, Senninger and IIRD use. The losses by real evaporation and haulage (PEA) and for empiric equations, based on the measures with water pluviometer that arrives to the land are calculated. Besides the main variables that intervene in the process; as well as to propose an equation for the calculation of them, making an analysis of multiple regression. The results reflected that the losses for real evaporation and haulage (PEA) in the transmitters of low pressure oscillated from 1,21% to 30,03%, while those calculated by the proposal empiric equation fluctuated from 1,97% to 25,17%. The fundamental variables that it contributed are the study to estimate the losses for evaporation and haulage (PEA), the work pressure, wind speed and the deficit of the vapor of water pressure. It was also achieved the equation of better adjustment with R2 = 0,904439 according to the carried out analysis of multiple regression.

Palavras-chave : losses; evaporation; transmitter.

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