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The values obtained from the simulation model are not statistically different from the values for the value stream map. Similarities can be determined by the confidence interval of each process’ cycle times. For example, 7.53 ± 7.51 with α of 95% indicates that the value can vary from 7.52 to 7.54 min/MBF; no values were found outside the confidence interval. Differences between the model and the VSM can be product of sampling error. Kelton et. al (2011) explains sampling error as follows: “the simulation model results match the expectation in probabilistic sense, but we either haven’t run the model long enough or for enough replications.” However, the confidence intervals of the values showed that they are not statistically different, so they were considered appropriate for the simulation. Also, throughput was compared for the model and VSM. An approximate throughput of 1,057,000 BF for Plant C and 3,249,300 BF for Plant D (Table 33) was obtained. Differences were not considered statistically different according to the confidence intervals obtained for each parameter. For example, the throughput of Plant C was 1,057,000 BF with a confidence interval of ±1, which means that the throughput can vary from 1,056,000 to 1,058,000. Differences between the values can be product of the variability and randomness of the simulation software. Table 33. Throughput comparison between VSM and SimioTM model Throughput Model 1,057,000 BF 3,249,300 BF After validating the base model, two new models were derived from the base model: air drying with vacuum drying (case A) and vacuum drying without air drying (case B). Little’s Law worst practical case was used to compare the results from Plant C and D. Equation 4 and 5 of Little’s Law formula was applied for both cases A and B with the objective to calculate the WIP0 and determine if the production lines were working efficiently by using vacuum drying. If the WIP are lower than the WIP0 it means that the production line is not working efficiently (worst case); and if the WIP is higher than the WIP0 (best case) it means that the line Company Plant C 1,057,875 BF VSM Plant D 3,250,000 BF 112PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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