Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Pollution Concentration in Rooms

Concentration of a pollution in a limited space as a room depends on the amount of polluted material spread in the room, supply of fresh air, outlets positions and construction, principles used for supply and outlet from the space.

Sponsored Links

The concentration of a pollution in a limited space as a room, container, tank etc. depends on

  • amount of polluted material spread in the room or space
  • amount of fresh supply air or fluid
  • the outlet positions and constructions
  • the principles used for supply and outlet from the space
  • fluid flow in the space

pollution concentration in room

The generic equation for pollution concentration (amount of polluting product to amount of fluid in space (like air a room)) can be calculated

c = q / n V (1 - e-nt) + (c1 - c2) e-nt + c2                                      (1)

where

c = concentration in the space (or in the room) at perfect mix (m3/m3) (kg/kg)

q = amount of pollution added to the space (m3/h) (kg/h)

n = volume changes per hour (h-1)

V = volume or mass of the space (m3) (kg)

e = the number 2.72..

t = time (h)

c1 = concentration in the space at start (m3/m3) (kg/kg)

c2 = concentration in the supply fluid (m3/m3) (kg/kg)

If the start concentration (t = 0) of the space and the concentration in the supply fluid is zero, equation (1) can be reduced to

c = q / n V (1 - e-nt)                                   (2)

Note! After some time the concentration in the room will stabilize. The table below shows the value of c when the amount of pollution q = 1, and the volume of the space V = 1.

For full table - rotate the screen!

Pollution Concentration in Rooms
Volume changes per hour
(1/h)
Concentration of pollution - c - (m3/m3) (kg/kg)
Time - t - (min)
1020408016032064012802560
0.5 0.1599 0.3070 0.5669 0.9732 1.4728 1.8610 1.9903 2.0000 2.0000
1 0.1535 0.2835 0.4866 0.7364 0.9305 0.9952 1.0000 1.0000 1.0000
2 0.1417 0.2433 0.3682 0.4653 0.4976 0.5000 0.5000 0.5000 0.5000
4 0.1216 0.1841 0.2326 0.2488 0.2500 0.2500 0.2500 0.2500 0.2500
8 0.0921 0.1163 0.1244 0.1250 0.1250 0.1250 0.1250 0.1250 0.1250
16 0.0582 0.0622 0.0625 0.0625 0.0625 0.0625 0.0625 0.0625 0.0625
32 0.0311 0.0312 0.0312 0.0313 0.0313 0.0313 0.0313 0.0313 0.0313
64 0.0156 0.0156 0.0156 0.0156 0.0156 0.0156 0.0156 0.0156 0.0156

pollution concentration in room

Sponsored Links

Related Topics

  • Ventilation

    Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Sponsored Links

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

Citation

This page can be cited as

  • The Engineering ToolBox (2003). Pollution Concentration in Rooms. [online] Available at: https://www.engineeringtoolbox.com/room-polution-concentration-d_120.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































12.8.9

Sponsored Links
.