Noncondensable Gas Composition and Outgassing Rates in the Open-Cycle OTEC System with Direct-Contact Condensation

by Stephen K. Oney,
Hans J. Krock,

Document Type: Proceeding Paper

Part of: Ocean Energy Recovery


This paper will present the results of recent measurements of noncondensable release from an open-cycle ocean thermal energy conversion (OC-OTEC) system in a direct-contact condensation configuration. These measurements are the first of their nature to be performed on a prototype OC-OTEC power system using actual sea water and can be used to predict noncondensable release rates for future OC-OTEC power plant designs. An in-line Leybold-Inficon Quadrex 100 Residual Gas Analyzer (Mass Spectrometer) system was used to measure noncondensable partial pressures at the exhaust of the direct-contact condenser (DCC) from which the extent of outgassing of both the cold and warm water feed streams were derived. Reported data predict nearly 100% outgassing of the noncondensables in the cold water stream and approximately 70-75% outgassing of the noncondensables in the warm water stream. A breakdown of the relative contribution of each noncondensable gas is included.

Subject Headings: Hydro power | Rivers and streams | System analysis | Thermal analysis | Thermal power | Power plants | Ocean engineering | Energy conversion

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