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Task Task Description Deliverable 1 Develop Mechanistic Models of s-CO2 Turbomachinery The Subcontractor shall develop accurate mechanistic models of turbomachinery that can be used to predict the design point and off- design point operation of s-CO2 power cycles. It has been shown by many researchers, for example Gong et al. (2006), that the pressure-flow behavior of a compressor can be most concisely expressed as a relationship between the head coefficient (representing the dimensionless pressure rise) and the flow coefficient (representing the dimensionless flow rate). Such a relationship is unique for a particular machine, but defines the pressure-flow behavior of that machine over a wide range of operating conditions. The efficiency of the compressor can also be expressed as a function of the flow coefficient. Using these dimensionless behaviors, developed based on data for specific machines, the Subcontractor will develop robust approaches to characterize the compressor behavior over a range of conditions. The turbine is most conveniently represented as a fixed area restriction (assuming it is a fixed nozzle device). The efficiency of the turbine is adequately captured as a function of the ratio of the tip speed to the isentropic (or spouting) velocity. Again, these parameters and functions should be obtained based on consideration of a particular machine; but the approach will represent that machine over a wide range of operating conditions. The pressure/flow operating point of the system is then set by matching the head-flow behavior of the compressor with the flow resistance afforded by the turbine (and, to a lesser extent, the heat exchangers). With the pressures and flow computed, the efficiency of each device can be obtained from associated efficiency functions. The Subcontractor shall follow such an approach to characterize the supercritical turbine. Bi-monthly report presented to the technical monitor via teleconference or other means that allow for questions and discussion. See schedule above table. 2 Integrate Components into Power Cycle System Model Methods of representing the combined off-design performance of the entire system (not just the turbomachinery) will need to be developed and coded into TRNSYS. Development of detailed supercritical carbon dioxide models that capture the behavior of the heat exchangers and turbo machinery and its implementation into TRNSYS is the major goal for this project. The manner that these models will be implemented in TRNSYS will be determined in the course of this research. The TRNSYS implementation may rely on empirical performance maps or it may be implemented with a detailed model coded for TRNSYS. Bi-monthly report presented to the technical monitor via teleconference or other means that allow for questions and discussion. See schedule above table. 3 Written Summary Report – Research to Date An interim summary report shall be prepared at the conclusion of the study in the form of summary report. It is expected that the student investigator will be a PhD candidate and will not have concluded his/her Summary report due February 15, 2012. 3PDF Image | Supercritical CO2 Power Cycles for Use in Concentrating Solar Power
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