Batches of 4 (A-D) products are produced (in a flowshop plant) using the equipment processing times in Table P3.18 (all times are given in hours).

It is decided to operate using a campaign time of 600 h (1 month). The relative numbers of batches to meet current demand are n_A = n_B = n_C = 3n_D. Determine the numbers of each batch of A, B, C, and D for the 600 h campaign time, for the following scenarios:

• Produce each product using single-product campaigns, that is, produce all A, then switch to B, etc.
• Produce multiple products using the sequence AAABBBCCCDAAABBBCCCD….
• Would the result change for Part (b) if a uis (unlimited intermediate storage) process was used instead of the zw (zero-wait) process used in Part (b)?
• For Part (a), determine the amount of storage needed for each product to meet the demand over the 600 h campaign time.

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Table P3.18 Equipment Processing Times for Problem 3.18 Equipment Mixer Reactor Product AProduct BProduct CProduct D 1.5 3.5 2.0 5.0 2.0 12.0 2.5 3.0 Still 4.0 Dryer 2.0 Packaging 3.5 Total volume of product produced in 1 month (m³)10.0 2.0 3.0 5.0 2.5 2.5 15.0 3.0 4.0 2.0 5.5 3.0 5.0