1] Content of modification
Installation of Drain trap

2] Cost-down facts
Install condensate drain from critical points in the compressed air system without any loss of compressed air.- Operating cost-down.

Air leak points : 33 points
▶ Comp'(Inter-cooler, After-cooler, Separator) : 21 points
▶ Air receiver : 4 points
▶ Dryer : 8 points

Manual ball valve for condensate : 4 points

▶ Amount of 7Kg/㎤ pressure air leak at 4 points: 1,116㎥ (reference to air flow chart)

Air leak volume of comp room at factory #2

▶ 1,116㎥/min x 33 points = 38,478㎥/min
* Air capacity of piston type of 300 hp : 38.2㎥/min

Air loss cost of factory #2 comp' room

▶ 39.478㎥/min x 9.6won/㎥(unit cost of air/1㎥) = 369.39won/min
* Amount of air loss per year :146,277,962won (reference to air flow chart)

mount of energy saving by installing drain trap at factory #2 comp. room

▶ 146,277,946won/annual.

Investment : 38,357,000 won
▶ Installation fee : 30,000,000 won
▶ Deprecation cost : 3,857,000 won /year
▶ Financial cost : 4,500,000 won/year

Saving facts
▶ Operating cost down : 146,277,964won/year

Expectation money

▶ 146,000,000 won/annual

Feedback on investment

▶ 0.21month

<Condition>
Comp' : 250HP(PISTON TYPE)
Loading rate : 80%, Efficiency : 80%
▶30.4㎥/minx60x0.8x0.8=1.167㎥/hr

Electricity

▶ Compressor motor : 188KW
▶ Moto for ooling water : 5KW
▶ Unit cost of electricity : 51won /KWH
{(188 + 15KW) x 51won}÷1,167㎥/hr = 8.87won/㎥

Maintenance fee (6,000,000won per year : result of 1997)

▶ 6,000,000won÷(1,167㎥ x 24hr x 300day)= 0.71won/㎥

Facility depriciation fee

▶ Price of compressor : 50,000,000won, Dryer : 20,000,000won and life of them : 20 years.
{(70,000,000won-7,000,000won)÷20 year}÷ (1,167㎥/hrx24hrx300day)
= 0.37won/㎥

Depriciation fee of absorption gel : 3,000,000 won/5 year

▶ (3,000,000won-300,000won)÷5years｝÷ (1167㎥/hrx24hrx300day) = 0.06won/㎥

Unit cost of 1

▶ 1+2+3+4 = 9.6won /㎥