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22nd International Congress of Mechanical Engineering (COBEM 2013) November 3-7, 2013, Ribeirão Preto, SP, Brazil For analysis of OTEC plant to produce 100 MW, some considerations were made. It is assumed that the isentropic efficiency of the turbine and pump are equal to 90%. The condenser and the boiler are modeled as isobaric. The temperature of the ocean surface (warm part) at the input TW,i and output TW,o boiler are, respectively, 28 o C and 24 o C. The temperature of the cold part of the ocean at the input TC,i and the output TC,o of the condenser are respectively 4 ° C and 8 °C. It is considered that the overall heat transfer coefficient in the boiler UW and condenser UC are equal to 1000 2 W/m .K. To analyze the performance of the working fluid in the OTEC plant was used the ESS software, with the advantage of having the thermodynamic properties of the working fluid and still able to perform mathematical routines. The variables selected to be analyzed in the EES are boiler pressure Pboil and condenser pressure Pcond. Through combining various pressures of the boiler and condenser, then obtained the specific power Pe for each working fluid. The mathematical model for this purpose is based on the first law of thermodynamics to open systems operating in steady state, with variations of kinetic and potential energy negligible. The mass flow of the working fluid cycle may be calculated as: & m& = W c y c l e ( 1 ) where h3 is the specific enthalpy from the saturated steam in stage 3 and h1 is the specific enthalpy from the saturated liquid at state 1. The rate of heat transference which enters in the cycle per unit of mass flow of the working fluid can be calculated by combination the mass and energy balance at the boiler: & m& & m& & m& & m& The net power developed by the cycle per unit of mass flow rate of the working fluid can be calculated as: Qin =h−h (2) 32 Qout =h−h (3) 41 Wt =h−h (4) 34 Wp =h−h (5) 2l &&& Wnet =Wt −Wp m& m& m& (6) (7) ISSN 2176-5480 h3 −h4 −(h2 −h1) The rate of heat transfer which leaves the cycle per unit of mass flow of the working fluid can be calculated by the combination of the mass and energy balance in the condenser: The power developed by the turbine per unit of mass flow of the working fluid can be calculated by the combination of the mass and energy balance in the turbine: The power consumed by the pump per unit of mass flow of the working fluid can be calculated by the combination of the mass and energy balance at the pump: The thermal efficiency of the cycle η is defined as: & η=Wnet m& & Qin m& The heat transference rate which enters the cycle can be calculated using the Eqs. (2) and (1), in others words: 602PDF Image | PERFORMANCE ANALYSIS OF FLUIDS R12, R152A, R134A AND R500 FOR AN ORGANIC RANKINE CYCLE USED IN AN OTEC POWER PLANT
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