Optimum Removal of Noncondensable Gases for Open Cycle OTEC System

by T. Kajikawa, MITI, Electrotechnical Lab, Japan,
K. Nishiyama, MITI, Electrotechnical Lab, Japan,
M. Amano, MITI, Electrotechnical Lab, Japan,
H. Takazawa, MITI, Electrotechnical Lab, Japan,



Document Type: Proceeding Paper

Part of: Ocean Energy Recovery

Abstract:

For an open cycle OTEC system the dissolved gases in warm surface seawater are evolved in the flash evaporator. Those behave as noncondensable gases in the condenser and degrade the condensing heat transfer performance. The noncondensable gases continuously enter the condenser. It is necessary to reject some parts of them from the condenser by an exhaust system. The objective of this paper is to clarify the optimum removal of noncondensable gases for an open cycle OTEC system by introducing the reject ratio of the noncondensable gases and entrainment ratio function as the parameters. In the analysis the effects of the concentration of noncondensable gases the condensing heat transfer performance and the condensing temperature are included. The net power output per unit warm seawater flow rate is represented as the function of reject ratio. Both the optimum reject ratio and the amount of net power output are highly affected by the entrainment ratio function.

Subject Headings: Dissolved gases | Thermal power | Steam power | Sea water | Heat transfer | Entrainment | Temperature effects

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