Comparative Analysis between Single- and Two-Stage District Water Heating by Backpressure Steam Turbine

In the article is estimated the profit of the transition from single to two-stage district water heating by back pressure steam turbine. It is obtained theoretical expressions for extra produced and consumed power in a two-stage heating system compared to one single-stage. An innovation in the expressions is presentation of extra powers as ratio to the turbine heat load. By using the expressions is obtained results for these powers under certain assumptions. The results of extra produced and consumed powers from the formulas are compared with results from models of a concrete steam turbine installation.