(Solved): A single pass type surface steam condenser is to be designed for a 120MW geothermal plant. The ...

A single pass type surface steam condenser is to be designed for a $120\mathrm{MW}$ geothermal plant. The expected steam supply pressure and temperature are $160\mathrm{bars}$ and $500^{?}\mathrm{C}$ respectively, while the condenser pressure is to be kept at $0.08\mathrm{bars}$. The inlet and outlet temperatures are to be kept at $25^{?}\mathrm{C}$ and $35^{?}\mathrm{C}$ respectively and the condensate is to be saturated water. Determine the number of tubes required if the internal and external diameters of the available tubes are $260\mathrm{mm}$ and $300\mathrm{mm}$ respectively and space requirements restrict the tube length to $4.8\mathrm{m}$. Neglect any losses and assume that the expansion in the turbine is isentropic. Take: $h_0$ (steam side) $=5,000\mathrm{W}/{\mathrm{m}}^{20}\mathrm{C};h_i$ (water side) $=1000\mathrm{W}/{\mathrm{m}}^{20}\mathrm{C};f_i$ (water side fouling factor $)=0.0002{\mathrm{m}}^{20}\mathrm{C}/\mathrm{W};k$ (conductivity of tube material) $=82\mathrm{W}/{\mathrm{m}}^{?}\mathrm{C}$.