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118 steady-state second law efficiency for the implicit and infinite-NTU models for a system with NTU~500. In this case both the Infinite-NTU and implicit models have less than ~3% error with meshes as coarse as 100 Nodes. Note that the infinite-NTU model converges at nearly zero error indicating at NTU~500 the infinite-NTU assumption is an excellent approximation. The explicit model results are not included in Figure 6.18 because of stability issues encountered at relatively fine mesh sizes for the test conditions. Figure 6.19: Model accuracy sensitivity to node count for a large NTU system (NTU~500) While the implicit model and infinite-NTU models return results of comparable accuracy, the implicit model comes with a significantly larger computational cost. If the explicit model remains stable it returns very accurate results, but its stability requires very fine meshes and corresponding computation time. The stability requirements of the simplified explicit model incur too large a time penalty for it to be considered further for long-term simulation. Figure 6.20 shows a case analogous to Figure 6.19 but with a lower NTU value of 100. In this case the performance of the implicit model is virtually the same as the NTU~500 case, with error approaching zero as the mesh size increases. The error of the infinite- NTU model decreases as the node count decreases, it then becomes large as the nodePDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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