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

Sensible Heat Flow

Sensible heat is dry heat causing change in temperature but not in moisture content

Sensible Heat Flow - SI-Units

The sensible heat flow can be expressed in SI-units (metric) as

Qs = cp ρ q Δt / 3600                            (1)


Qs = sensible heat flow (kW)

cp = 1.005* - specific heat air (kJ/kg K)

ρ = 1.202* - air density at standard conditions (kg/m3)

q = air flow (m3/hr)

Δt = temperature (oC)

* Note that air properties changes with temperature. Interpolate values if necessary.

Sensible Heat Flow - English (Imperial) units

In English (imperial) units the sensible flow heat can be expressed as

Qs= 60 cp ρ q Δt = 1.075 q Δt                                    (2)


Qs = sensible heat flow (Btu/hr)

cp = 0.2388 - specific heat (Btu/lboF)

ρ = 0.075 - air density at standard conditions (lb/ft3)

q = air flow in (ft3/min)

Δt = temperature difference (oF)

Example - Sensible Heat Flow

10000 m3/h of air is transported through a building with the ventilation system. The temperature of the make up air is 0 oC. The temperature of the room air is 20 oC.

The sensible heat flow can be calculated as

Ql = (1.005 kJ/kg) (1.202 kg/m3) (10000 m3/h) ((20 oC) - (0 oC)) / 3600 

    = 67 kW

Related Topics

  • Air Psychrometrics

    Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.

Related Documents


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

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .


This page can be cited as

  • The Engineering ToolBox (2004). Sensible Heat Flow. [online] Available at: [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