%0 Journal Article %T COMPLEX ASSESSMENT OF EFFICIENCY OF POWER UNITS USING THE RENEWABLE POWER SOURCES %A Shishkin, N.. %K solar water heaters, windmill, biogas installations, thermal energy, electrical energy, cost of installations %J Vestnik of Astrakhan State Technical University %D 2014 %N 2014 %P 7 %I Astrakhan State Technical University