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Preliminary Sizing of Compressed Air Receiver


You may already read my blog about how to size air compressor and instrument air capacity. Please check this link if you have not read the article. I hope you find it useful.

As a continuation of the post, I want to share you how to size capacity of compressed air receiver.

Compressed air receiver is used as buffer and storage medium between the compressor and air consumers.

A common formula used to size compressed air receiver is as followed:

V = (t/60) x C x pa/(p1-p2)

Where:

V = volume of receiver tank (m3)

t = time for the receiver to go from upper to lower pressure limit (minute)

C = air consumption (m3/h)

pa = atmospheric pressure (1.01 bara)

p1 = maximum tank pressure (bara)

p2 = minimum tank pressure (bara)

 

Example Sizing of Compressed Air Receiver

For an air compressor system with air consumption 100 Nm3/h, with actual supply pressure 8 barg (8.84 atma) and actual supply temperature 30oC (303.15 K), maximum tank pressure 9 barg (10.01 bara), minimum tank pressure 7 barg (8.01 bara) and 15 minutes time for the receiver to go from upper to lower pressure – the volume of the receiver tank can be calculated by following step.

Step 1: Calculate air consumption (C) at actual condition

Air consumption at actual condition can be simply calculated by using the following formula:

P1 x V1/ T1 = P2 x V2/T2

­Where:

P1 = Pressure at standard condition (1 atma)

T1 = Temperature at standard condition (273 K)

V1 = Air consumption at standard condition (Nm3/h)

P2 = Pressure at actual condition (atma)

T2 = Temperature at actual condition (K)

V2 = Air consumption at actual condition (m3/h)

Equation above is modified into:

V2 = P1 x (V1/ T1) x (T2/P2)

V2 = 1 x (100/273) x (303.15/8.84)

V2 = 12.56 m3/h

So, air consumption at actual condition is 12.56 m3/h.

 

Step 2: Calculate air receiver capacity

Use this formula to estimate air receiver capacity:

V = (t/60) x C x pa/(p1-p2)

V = (15/60) x 12.56 x 1.01/(10.01-8.01)

V = 1.58 m3

So, estimated air receiver capacity is 1.58 m3.

I hope you find this post useful.

Tired of calculationg by yourself? Click this link to download spreadsheet of preliminary sizing of air receiver capacity.

 

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