Use of Mixtures as Working Fluids in Ocean Thermal Energy Conversion Cycles. Phase II. Final Report, August 15, 1976--February 28, 1978

摘要

During Phase II of this research program, the following elements of research have been performed: (1) the thermodynamic properties of ammonia, water and ammonia-water mixtures have been correlated in the range of conditions applicable to OTEC cycles, (2) the OTEC cycle simulator OTEC-3 was modified so that ammonia-water mixtures could be used as working fluids, (3) a working fluid recycle loop was added around the evaporator, (4) a first pass optimization program was developed for use in OTEC cycle design, (5) a sensitivity analysis was performed on the OTEC ammonia cycle in order to provide an optimized base case for later comparison with ammonia-water cycles, (6) a preliminary correlation of the transport properties of ammonia-water mixtures was selected, based on literature correlations, (7) a preliminary investigation of the effects of water leakage on ammonia cycle heat transfer coefficients was performed, (8) an investigation of the overall effects of water leakage on an ammonia OTEC cycle was performed, and (9) an initial optimization was made for an OTEC cycle using an ammonia-water mixture as the working fluid. (ERA citation 04:042666)