Calculation for vacuum creation in heat exchanger
[B][U]Data:[/U][/B]
Time (t) = 30 min = 1800 s
Dia of drains (D[SUB]d[/SUB]) = 0.0525 m
Dia of bleeder vents on CWR (D[SUB]b[/SUB]) = 0.0525 m
No. of drains operated (N[SUB]d[/SUB]) = 4 drains
No. of bleeders on CWR (N[SUB]b[/SUB]) = 2
Volume of tank (V) = 5.7 m[SUP]3[/SUP]
Density of water (ρ[SUB]w[/SUB]) = 1000 kg/m[SUP]3[/SUP]
Density of air (ρ[SUB]a[/SUB]) = 1000 kg/m[SUP]3[/SUP]
[B][U]Solution:[/U][/B]
Area of Drain (A[SUB]d[/SUB]) = 0.00864 m[SUP]2[/SUP]
Flow-rate (Q) =0.00316 m[SUP]3[/SUP]/s
Velocity of water (v[SUB]w[/SUB]) =0.36 m/s > 3m/s within erosion velocity range
I need to calculate no. of bleeder vents required for the following data. i m stuck here. the vents are to be of 0.0525 mm. Also i want to calculate how much vacuum is created in our current condition if we are using 2 bleeder vents (this is the no currently being used but causing vacuum creation)