![]() ![]() The direct-integration method has been applied to wet gas compression data by Hundseid to illustrate the large difference between the Schultz and direct-integration methods for wet gas compression. ![]() Therefore, the method is better suited for high-pressure ratio impellers or applications with significant property variation. A major advantage of the direct-integration method over the Schultz method is that the fluid properties are calculated for each step in the calculation instead of an average. The direct-integration method has been shown by Huntington to be more accurate than the Schultz method, and is compared among different equations of state by Hundseid. From the method, the polytropic head and efficiency for the compressor are determined when the calculated discharge temperature matches the actual value. In this method, the polytropic efficiency is estimated for the calculation and held constant for all iteration steps. Therefore, a direct integration method has been used to quantify wet gas compression by iterating along incremental pressure steps through the compression process. In wet gas compression, however, the compression process is expected to have a significant effect on the fluid properties due to phase change of the liquid. In the method, the inlet and exit conditions of the compressor are used along with gas properties taken at the average conditions between the inlet and exit. The equations of PTC-10 are based on the method presented by Schultz to characterize compressor polytropic performance using real gases instead of the ideal gas assumption. Dirk Büche, in Compression Machinery for Oil and Gas, 2019 Direct Integration ApproachĬharacterizing the performance of wet gas compression is difficult when defining a polytropic efficiency using the widely accepted equations from ASME PTC-10. ![]()
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7/2/2023 04:12:12 pm
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