The utilization of low grade heat for concentration of cane or beet juice through evaporation using low pressure vapours or steam in single or multi effects evaporation is described in the present invention. In the present invention, this low pressure steam or vapours from pans, evaporators and exhaust turbines which are otherwise discarded as waste from the system is used for concentration of the cane or beet juice. This low pressure operation or low pressure boiling of juice reduces inversion, scale and colour formation with reduced sugar losses through inversion. Another positive effect of present invention is that power generation through the turbine increase considerably because of the elimination of bleed steam. This further improves the turbine efficiency and save fuel for the same designed power output.
