Open Cycle OTEC Thermal-Hydraulic Systems Analysis and Parametric Studies

We have developed an analytic thermohydraulic systems model of the power cycle and seawater supply systems for an open cycle ocean thermal energy conversion (OTEC) plant that allows us ready examination of the effects of system and component operating points on plant size and parasitic power requirements. This paper presents the results of three parametric studies on the effects of system temperature distribution, plant gross electric capacity, and the allowable seawater velocity in the supply and discharge pipes. The paper also briefly discusses the assumptions and equations used in the model and the state-of-the-art component limitations. The model provides a useful tool for an OTEC plant designer to evaluate system trade-offs and define component interactions and performance.