Problem 12.4: Explain why the actual maximum safe cycle
From Chapter 12 Problem Set. Level 3: Optimization.
Question
Explain why the actual maximum safe cycle count may be lower than the value you calculated, considering pH, temperature, and the interactions between scaling parameters.
Answer
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(a) Q = 750 tons × 15,000 BTU/hr per CT ton = 11,250,000 BTU/hr. (b) Recirc = 750 × 3 GPM/ton = 2,250 GPM. (c) E = 2,250 × 10 × 0.85 ÷ 1,000 = 19.1 GPM. (d) B = 19.1 ÷ (4 − 1) = 6.37 GPM. M = 19.1 + 6.37 = 25.5 GPM. Check: M = 19.1 × 4 ÷ 3 = 25.5 GPM. ✓