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PENYELESAIAN SOAL TERMODINAMIKA (siklus udara standar) ………….

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Heat Conduction problems (Numerical Methods)   Energy from the Oceans (Problems)

Problem 1

An OTEC powerplant of the Claude type (Open type) has an ideal turbine operation between 25 and 15 C. For a turbine output of 1 MW, calculate: (a) mass flowthe rate of steam (kg/s), (b) the mass flow rate of warm water (kg/s) if the evaporator temperature drop is 2 C, (c) the mass flow rate of cold water (kg/s) if the evaporator temperature drop is 2 C, (d) the cold water pipe diameter (m) if the water velocity in it is not to exceed 1 m/s.  Problem 2

An OTEC powerplant of the Claude type (Open type) use 10e7 lbm/h of warm water surface water at 70 F. The evaporator temperature is 66 F. The condensor pressure is 0.25 psia. The turbine polytropic efficiency is 0.84. the combined turbine-generator mechanical and electrical efficiency is 0.87.  Calculate: (a) the steam mass flow  rate into the turbine (lbm/s) , (b) the gross generator output (kW), (c) the gross cycle efficiency, and (d) the cold water pipe diameter (ft) if the cold water temperature and velocity in the pipe are 56 F and 1.0 ft/s, respectively  Problem 3

An Anderson OTEC cycle generates 150MW of nett power. It uses ammonia as the working fluid. Ammonia vapor is generated at 70F saturated and condenses at 50F. The turbine has an adiabatic efficiency of 0.80 and the turbine-generator has a combined mechanical-electrical efficiency of 0.88. The temperature drop of the ocean warm water in the evaporator and rise of the cold water in the condenser are both 8F. 14% of the gross output of the generator is used for plant pumps and other auxiliaries. Calculate: (a) the ammonia mass and volume flow rates, in pound mass per hour and cubic feet per minute at turbine inlet, (b) the warm and cold water mass and volume flow rates, in pound mass per hour and cubic feet per minute , and (c) plant nett thermal efficiency.