Comparative Analysis of the Coefficients of Energy Efficiency at the Various Levels of the Energy ExpenditureD. IVANOV

Research Institute for Mechanization and Electrification of Agriculture, BG-1080 Sofia, Bulgaria

AbstractIVANOV, D. 1999. Comparative analysis of the coefficients of energy efficiency at the various levels of the energy expenditure.

Bulg. J. Agric. Sci., 5: 963-974A comparative analysis of the coefficients of energy efficiency of the theoretical models in the different possible production conditions was carried out. The theoretical correlations of the different types of coefficients of energy efficiency on the theoretical model, developed by the author, were studied and established. The marginal possible values of the coefficient of energy efficiency at maximum possible energy returns, when a certain grain production physically makes sense, were established. A comparative analysis of the respective coefficients of energy efficiency was carried out by means of model value replacement.

It was established that all theoretical variants of correlations between realistic energy returns of grain crops and the respective production energy expenditures the energy difference is the highest at optimal levels of energy expenditures and moderate energy returns (yields). In all theoretical variants of alteration of the constant effect of solar energy in grain crops the optimal coefficient of energy efficiency is higher than the analogous coefficients at higher levels of energy returns. It was established that in all theoretical variants of alteration of the coefficient of energy efficiency at maximum possible energy returns, the optimal coefficient of energy efficiency is higher than the analogous coefficients at higher levels of energy returns.

Key words:comparative analysis, coefficients of energy, grain production, theoretical model, optimal levels of energy efficiency