Discussion
Deutsch-Anderson efficiency for a precipitator at four plate areas, with a migration velocity of 0.10 m/s and a flow of 100 m3/s.
| Plate area (m2) | Exponent Aw/Q | Efficiency (per cent) |
|---|---|---|
| 2000 | 2.0 | 86.5 |
| 4000 | 4.0 | 98.2 |
| 6000 | 6.0 | 99.75 |
| 8000 | 8.0 | 99.97 |
What does the table show about the cost of high efficiency?
Answer: B
The first two thousand square metres buy 86.5 points and the last two thousand buy about a fifth of one. Thinking in penetration rather than efficiency makes the pattern obvious, since penetration simply falls by a constant factor each time.
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