Influences on OTEC Cycle: Effects of Temperature Fluctuations
Explore the effects of temperature fluctuations on an OTEC cycle. The project involves investigating three working fluids - Ammonia, Ammonia-water, R32, and R134a, using a model implemented in MATLAB. Results show a decrease in power and efficiency proportional to temperature difference, with recommendations for further optimization and experiments.
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Presentation Transcript
Analysis of External Influences on an OTEC cycle Vilborg Gu j nsd ttir 1 Challenge the future Challenge the future
The Project What are the effects of temperature fluctuations on the OTEC cycle? Based on previous optimization of the OTEC cycle Model created Experiments performed to validate the model Three working fluid researched Ammonia Ammonia water R32 R134a 2 Challenge the future
The model Steady state off design model Implemented in MATLAB Thermodynamic properties from the REFPROP database Experiments performed with pure ammonia to validate the model 3 Challenge the future
The Thermodynamic cycle 4 Challenge the future
The OTEC Demo 5 Challenge the future
Validation 6 Challenge the future
Results 7 Challenge the future
Results 8 Challenge the future
Conclusions Decrease in power and efficiency is proportional to the decrease in temperature difference Warm and cold seawater temperature fluctuations have similar effects Each degree difference has high impact Mass flow of the working fluid can be varied to improve the performance slightly 9 Challenge the future
Recommendations Combine the off design model with optimizing model Perform more experiments with more sensors Confirm pressure drop correlations Confirm heat transfer correlations for ammonia water 10 Challenge the future
1st Ocean Energy colloquium Questions ? June 2015 11 Challenge the future Challenge the future
