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Table 1 Component specification of the demonstration plant

From: Making use of geothermal brine in Indonesia: binary demonstration power plant Lahendong/Pangolombian

Component Description
Primary heat exchanger 2 × Shell-and-tube heat exchanger with brine on the tube side and hot water (HW) on the shell-side; 2xAFT-types in series, heat transfer area: 2 × 310 m2, Thermal capacity = 2  × 2250 kW
Heat transfer rate = 1100 W m−2 K−1, LMTD = 7.1 K
Each vessel with 2 passes on shell and tube side
Tube design: OD = 19.05 mm, Thickness = 1.65 mm, Length: = 6.1 m, Pitch = 28.575, Tube pattern:90, Number = 2  × 860
Shell side design: cross baffles, Cut = 21.2%, Spacing = 598 mm, Number = 9 (each pass)
Design data tube side: flow rate = 35 kg/s, inlet temperature = 172.5 °C, outlet temperature = 142.5, pressure drop = 12 kPa
Design data shell side: flow rate = 35 kg/s, inlet temperature = 135 °C, outlet temperature = 165 °C, pressure drop = 23 kPa
Evaporator/preheater Shell-and-tube heat exchanger with hot water on the tube side and working fluid on the shell-side; staggered arrangement
Recuperator Shell-and-tube heat exchanger with finned tubes: working fluid vapor on the shell-side and liquid on the tube side
Condenser Shell-and-tube heat exchanger with working fluid on the shell-side and cooling water (CW) on the tube side
Dry cooler Horizontal tube bundle with finned tubes, cooling water flow inside the tubes and forced air flow across the tube bundle; forced air flow by means of variable speed fans
Heat exchange surface: 6 × 2999.8 m2
Surface reserve: 26%
Thermal capacity: 6 × 583.0 kW
Design data air-side: Volume flow rate = 6× 157,127 m3/h, Inlet temperature = 30 °C, Outlet temperature = 43 °C
Design data tube-side: Volume flow rate = 6 × 50.7 m3/h, Inlet temperature = 49 °C, Outlet temperature = 39 °C, Pressure loss = 0.28 bar
Heat transfer coefficient: 36.52 W m−2 K−1
Electrical power consumption: 6 × 5.88 kW
Turbogenerator Hermetic turbogenerator with radial-inflow, nozzle stage and axial outflow; rotational speed 12,000 rpm
Working fluid pump Magnetically coupled centrifugal pumps; two pumps in parallel, head = 214 m, flow rate = 2 × 26 m3/h
Hot water pump Variable speed centrifugal pump: Head = 25 m, flow rate  = 150 m3/h
Cooling water pump Variable speed centrifugal pump: Head = 16 m, flow rate = 370 m3/h