## Mtd

where MTD = mean temperature difference.

Table 1. Energy Needs, Fluid 1

Conventional

85% Regeneration

Steam required

Assuming average steam cost:

\$6.00 per 1000# Steam cost/h Annual steam cost

Heat 100 GPM 50 200°F 50,000 X 150

Heat 100 GPM 50 177.5°F by cooling fluid 2 from 200 to 72.5°F

= 7500 lb/h to heat to 200°F 5°'°0<^ 22 5 = 1125 lb/h suppemental heat to raise temperature to 200°F

7.5 X \$6.00 = \$45.00/h \$45.00 X 24 X 365 = \$394,200

Table 2. Energy Needs, Fluid 2

Conventional

85% Regeneration

Equivalent refrigeration required

Using available 85°F cooling-tower water

Assuming average water cost of \$0.05 per 1000 gal Water cost/h Annual water cost

Cool 100 GPM 200 50°F 7,500,000

12,000

200 gpm to cool 200 ->• 90°F 200 X 60 = 12,000 GPH

Cool 100 GPM

200 ->• 72.5°F by heating fluid 1 from 50 to 177.5°F .15 X 625 = 93.5 tons supplemental cooling to lower temperature to 50°F None

None

None None

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