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

Heating Water by Injecting Steam

Water can be heated by injecting steam.

Sponsored Links

For some applications a direct heating of water by injecting steam may be convenient. A direct heating system is very simple since it don't require heat exchangers. Fouling of surfaces, which may be a major problem in certain processes, is also avoided.

The required steam flow rate in an steam injection process can be calculated as

ms = P / (hg - (t cp))                                  (1)

where

ms = steam flow rate (kg/s)

P = heat transfer rate or power from the steam (kW)

hg = specific total enthalpy of the steam before the control valve (kJ/kg)

t = final temperature of the water after the heating (oC) 

cp = specific heat water (kJ/kg)

The specific heat of evaporated steam is related to zero degrees Celsius. 

Example - Heating a Water Volume by Injecting Steam

100 liter (kg) of water is heated from 20 oC to 80 oC in 5 minutes (300 s). The specific heat of water is 4.2 kJ/kgoC and the power required to heat the water can be calculated as

P = (100 kg) (4.2 kJ/kgoC) ((80 oC) - (20 oC)) / (300 s)

   = 84 kW

The absolute steam pressure is 220 kPa and the total enthalpy of the steam is 2711 kJ/kg. The required steam flow rate can be calculated as

ms = (84 kW) / ((2711 kJ/kg) - ((80 oC) (4.2 kJ/kgoC)))

     = 0.035 kg/s

     = 127 kg/h  

The total steam consumption for the heating process can be calculated as

q = (0.035 kg/s) (300 s)

   = 10.5 kg

Sponsored Links

Related Topics

Related Documents

Sponsored Links

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 (2008). Heating Water by Injecting Steam. [online] Available at: https://www.engineeringtoolbox.com/steam-injecting-d_1058.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

















































9.29.12

Sponsored Links
.