Binary Geothermal Plant: Evaporator Pinch Point

Most geothermal resources on Earth are "medium enthalpy" — hot enough to be useful, too cool to flash directly into turbine-grade steam. Binary (Organic Rankine Cycle) plants solve this by boiling a low-boiling-point working fluid such as isobutane, R245fa or n-pentane in a heat exchanger against the hot brine, running a closed fluid loop through its own turbine, condenser and pump while the brine is simply reinjected underground. This simulator models the real energy balance of that evaporator: set the brine inlet temperature, the evaporating temperature (a stand-in for operating pressure), the working-fluid flow rate and the fluid itself, and watch net power output, cycle efficiency, heat duty and — most importantly — the evaporator's pinch-point temperature difference respond live, including the warning that fires when the pinch collapses and the heat exchanger becomes physically unbuildable at that flow rate.