A renewable energy system for the (co)generation of electricity and cooling in sunny areas of the world

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A renewable energy system for the (co)generation of electricity and cooling in sunny areas of the world consists of a solar Organic Rankine Cycle (ORC) power system, whose discharged thermal power is used to power an absorption refrigerator. The thermal power collected by the solar troughs and transferred to the working fluid (MDM) is 100 kW. The ORC power plant implements the supercritical and regenerated cycle configuration. The reduced pressure of the working fluid in the primary heat exchanger is Pr = 1.15, the temperature at the inlet of the turbine is 305°C, the temperature in the condenser is 100°C. The minimum temperature difference in the regenerator is 20 K. The isentropic efficiency of the turbine and the pump are 0.85 and 0.65, respectively. The auxiliaries’ consumption, including the solar field recirculation pump but excluding the main ORC pump, is 10% of the turbine gross power. The COP of the absorption refrigerator is 0.5. Calculate the electric power and the cooling power delivered by this system in these conditions. Calculate also the mass flow rate of diesel fuel if the same electric and cooling power were obtained with an engine generating both the electricity and the electricity for a compression refrigerator. The diesel engine efficiency is 0.35, while the coefficient of performance of the vapor compression refrigerator is COP = 4.5.

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