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The output has been consolidated into a single file output.txt. This file has information on the heat exchanger dimensions, fluid statepoints at every location in the cycle, the work requirements of compressors, and the efficiency of the cycle. A.3 Troubleshooting CYCLES III usually runs without any problem, but if problems are encountered they will usually be due to excessive pressure drops or failure of the precooler to converge. Pressure drops can be reduced simply by expanding the pipes in the pipe model to increase flow area. The precooler will fail to converge if its volume is too small for the power rating of the system. The message on the screen output will read: function tp2-not converged Increasing the precooler volume, or the initial guess of the precooler volume for optimizations, will resolve the problem. In CYCLES III, the efficiency of the PCS is calculated using two methods. The first is based upon the heat added and heat rejected in the precooler. th Qadded Qrejected Qadded The second calculation is based on the work of the turbomachinery. WT WC th Eqn. A-1 Eqn. A-2 Qadded Both calculations should produce the same result, but slight differences will result depending on how finely spaced the fluid property tables are. Also, pressure drops in piping and kinetic energy changes affect the static enthalpy in pipe flows, which translates to changes in turbomachinery work, contributing to differences in the two efficiency calculations. In addition, the coolant will lose heat through the pipe walls to the atmosphere. This is generally negligible. The two calculation methods for thermal efficiency are displayed as eta1 and eta2 in the file output.txt. If they are substantially different, the tables should be regenerated with finer spacing. The other way to increase the accuracy is to reduce the number labeled as tolerance in the input file. Otherwise, their difference can be viewed as an uncertainty in the calculation. 134PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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