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# 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)

where

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)

where

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 - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

## Related Documents

• ### Cooling and Heating Equations

Latent and sensible cooling and heating equations - imperial units.
• ### Cooling Load - Latent and Sensible Heat

Latent and sensible cooling loads to consider when designing HVAC systems.
• ### Great Sensible Heat Factor - GSHF

The Great Sensible Heat Factor is the ratio sensible to total heat in a cooling coil.
• ### Latent Heat Flow

Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed.
• ### Room Sensible Heat Factor - RSHF

Room Sensible Heat Factor - RSHF - is defined as the sensible heat load divided by the total heat load in a room
• ### Sensible Heat Ratio - SHR

The ratio Sensible Heat (or Cooling) Load to the Total Heat (or Cooling) Load.

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## Citation

• The Engineering ToolBox (2004). Sensible Heat Flow. [online] Available at: https://www.engineeringtoolbox.com/sensible-heat-flow-d_702.html [Accessed Day Month Year].

Modify the access date according your visit.

9.29.12