Performance Analysis of Closed-type OTEC Cycle using Waste Heat

doi:2011.25.1.80

J. Ocean Eng. Technol. > Volume 25(1); 2011 > Article

J. Ocean Eng. Technol. 2011;25(1):80-84.
DOI: https://doi.org/10.5574/KSOE.2011.25.1.080

Lee Ho-Saeng,Jung Dong-Ho,Hong Seok-Won,Kim Hyeon-Ju

Marine Structure.Plant Research Department KORDI,Marine Structure.Plant Research Department KORDI,Marine Structure.Plant Research Department KORDI,Marine Structure.Plant Research Department KORDI

폐열 이용 폐쇄형 해양온도차발전 사이클의 성능

이호생,정동호,홍석원,김현주

한국해양연구원 해양구조물.플랜트연구부,한국해양연구원 해양구조물.플랜트연구부,한국해양연구원 해양구조물.플랜트연구부,한국해양연구원 해양구조물.플랜트연구부

Keywords: Closed-type ocean thermal energy conversion, Deep seawater, Generator, Waste heat

핵심용어: 폐쇄형 해양온도차발전, 해양심층수, 재생기, 폐열

Abstract

The cycle performance of closed ocean thermal energy conversion (OTEC) system with 50 kW gross power was evaluated to obtain the basic data for the optimal design of OTEC using waste heat such as solar power, discharged heat from condenser of power plant. The basic thermodynamic model for OTEC is Rankine cycle, and the surface seawater and deep seawater were used for the heat source of evaporator and condenser, respectively. The cycle performance such as efficiency, heat exchanger capacity, etc. was analyzed on the variation of temperature increase by waste heat. The cycle efficiency increased and necessary capacity of evaporator and condenser decreased under 50kW gross power with respect to the temperature increase of working fluid. Also, when the temperature increase is about $13.5^{circ}C$, the heat which can be used is generated. By generator with 0.9 effectiveness under the simulated condition, the cycle efficiency was improved approximately 3.0% comparing with the basic cycle.