How to select the capacity of the back pressure unit of a power plant with a heating area of ​​5 mil

All extraction condensing units are shut down during the winter heating season and only back pressure units operate to achieve an operating thermal efficiency of 80% and power generation coal consumption less than 200 g/kWh

Thanks to this mode of operation, the profit made from heating the factory in winter completely compensated for the losses in the period without heating, and the economic benefits throughout the year were considerably improved.