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Pumps > Cooling towers > Flashcards

Cooling towers Flashcards

1
Q

Range

A

T3-T4

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2
Q

Approach

A

T4 - Twb1

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3
Q

Make up water requirement using mass balance

A
  1. mw3 - mw4 = ma (w2-w1)
  2. mw5 = mw3 - mw1
  3. mw5 = ma (w2-w1)
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4
Q

Energy balance

A
  1. mw3h3 + mah1 + m5h5 = mw4h4 + mah2
  2. mw3 + mah1 + mw5t5 = mw4cpwt4 + mah2
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5
Q

Heat Balance

A

Heat absorbed by air = heat rejected by water
ma (h2 - h1) = mw3 Cp (t3-t4)

Water evaporated
mw3 - mw4 = ma (w2 - w1)

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6
Q

Cooling Tower efficiency (Nct)

A

Nct = range/range + approach
= t3 - t4 / t3 - twb

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Pumps (4 decks)

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