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

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

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EXAMPLE – Calculat<strong>in</strong>g losses<br />

from leaks<br />

unit value remark<br />

VD [m 3 ] 10 volume of the storage c<strong>on</strong>ta<strong>in</strong>er and of the system<br />

t [sec] 600 time for the pressure to drop from higher to lower level<br />

pe2 [bar] 11 pressure of the storage c<strong>on</strong>ta<strong>in</strong>er at the higher level<br />

(start of measurement)<br />

pe1 [bar] 9 pressure of the storage c<strong>on</strong>ta<strong>in</strong>er at the lower level<br />

(end of measurement)<br />

QL [m 3 /h] 120 leakage between maximum and m<strong>in</strong>imum pressure<br />

Q [m 3 /h] 1200 average demand of compressed air<br />

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

= [%] 10 > 5 % for small plant<br />

> 15-20 % for larger plant

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