Ventilation Systems: Operation and Testing - GHDonline
Ventilation Systems: Operation and Testing - GHDonline
Ventilation Systems: Operation and Testing - GHDonline
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Conservation of Energy<br />
• TP = SP + VP or<br />
T P = S P + V P<br />
• Energy losses:<br />
– Acceleration of air<br />
– Hood entry<br />
– Duct losses: friction (function of system materials & design)<br />
– Fitting losses: contractions & expansions<br />
• T P1 = T P2 + h L<br />
now substitute T P = S P + V P<br />
• S P1 + V P1 = S P2 + V P2 + h L<br />
Bench Grinder Hood<br />
Pressure Graphs for TP, SP, <strong>and</strong> VP<br />
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