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Air CompressorAir Discharge Volume : Technical Data

Normal | Pressure drop in direct piping | Ventilation volume | Drain volume

Various calculations

Ventilation volume

Calculation(example)
Q = H

γ•Cp(t2-t1)•60
Q : Ventilation volume [m/min]
H : Heat generation [kcal/h]
γ : Air specific gravity 1.2 [kg/m3]
Cp : Air specific heat 0.24 [kcal/kg• ºC]
t1 : Outdoor temperature [ºC]
t2 : Indoor temperature [ºC]
(1kW = 860kcal/h)
Example 1
Entire ventilation without dryer
Model: Z55A4 type
Heat generation : H = 55 [kW] × 860 [kcal/h]
= 47300 [kcal/h]
= t2–t1 = 5 [ ºC]

◊ Ventilation volume

Q = 47300

1.2 × 0.24 × 5 × 60		 = 547[m3/min]

◊ Vent window area

A = Q

60 × ν × α
ν : Air speed m/sec
α : Vent window opening ratio

Let ν = 2 [m/sec], α = 60 [%]

A = 547

60 × 2 × 0.6 		= 7.6[m2]
Example 2
Local ventilation (duct ventilation) without dryer
Model: Z55A
Heat generation : H = 55 [kW] × 860 [kcal/h] × 0.05
= 2365 [kcal/h]
= t2–t1 = 5 [ºC]

◊ Ventilation volume

  2365  
Q = = 27.4[m3/min]
  1.2 × 0.24 × 5 × 60  

◊ Vent window area

Intake air volume Q1 = Ventilation volume + Outgoing air volume
= 27 + 140 = 167[m3]
A = Q

60 × ν × α
ν : Air speedm/sec
α : Vent window opening ratio

Let ν = 2 [m/sec], α = 60 [%]

A = 167

60 × 2 × 0.6		 = 2.3[m2]
Example 3
Entire ventilation with dryer
Model: Z55A
Heat generation : H = 55 [kW] × 860 [kcal/h]
= 47300 [kcal/h]
Dryer DN55 11024 [kcal/h] = t2–t1 = 5 [ºC]

◊ Ventilation volume

Q = 473000 + 11024

1.2 × 0.24 × 5 × 60		 = 675[m3/min]

◊ Vent window area

A = Q

60 × ν × α
ν : Air speedm/sec
α : Vent window opening ratio

Let ν = 2 [m / sec], α = 60 [%]

A = 675

60 × 2 × 0.6		 = 9.3[m2]
Example 4
Local ventilation with dryer
Model: Z55A
Heat generation : H = 55 [kW] × 860 [kcal/h] × 0.05
= 2365 [kcal/h](the natural heat discharge is supposed to be 5%)
Dryer DN55 11024 [kcal/h[ = t2–t1 = 5 [ºC]

◊ Ventilation volume

Q = 2365 + 11024

1.2 × 0.24 × 5 × 60		 = 155[m3/min]

◊ Vent window area

Intake air volumeQ１ = Ventilation volume + Outgoing air volume
= 155 + 140 = 295[m3/min]
  Q
ν : Air speed m/sec
α : Vent window opening ratio
A =
  60 × ν × α

Let ν = 2 [m/sec], α = 60 [%]

A = 295

60 × 2 × 0.6		 = 4.1[m2]