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Training course on energy efficiency in SMEs - engine-sme.eu

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Step 6: Calculat<strong>in</strong>g the<br />

effective power<br />

To calculate the <strong>efficiency</strong> of the compressor, use the<br />

c<strong>on</strong>ta<strong>in</strong>er fill<strong>in</strong>g method as follows. Shut off the outlet from<br />

the storage c<strong>on</strong>ta<strong>in</strong>er and measure the time the compressor<br />

takes to reach the maximum pressure.<br />

As with the calculati<strong>on</strong> to determ<strong>in</strong>e leakage, the pressure<br />

difference should not be too small and the average pressure<br />

should corresp<strong>on</strong>d to the actual pressure required.<br />

To calculate the effective power of producti<strong>on</strong> use the<br />

follow<strong>in</strong>g equati<strong>on</strong>:<br />

QL =<br />

V x 3,600<br />

t<br />

x [pe2 - pe1]<br />

www.eng<strong>in</strong>e-<strong>sme</strong>.<strong>eu</strong><br />

Q [m 3 /h]: difference between maximum and m<strong>in</strong>imum pressure<br />

V [m3]: volume of the storage c<strong>on</strong>ta<strong>in</strong>er<br />

t [sec]:<br />

time for fill<strong>in</strong>g up the storage c<strong>on</strong>ta<strong>in</strong>er to a<br />

predeterm<strong>in</strong>ed level<br />

Pe2 [bar]: pressure of the storage c<strong>on</strong>ta<strong>in</strong>er at maximum pressure<br />

Pe1 [bar]: pressure of the storage c<strong>on</strong>ta<strong>in</strong>er at m<strong>in</strong>imum pressure

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