# Sensible Heat Formula

## Sensible Heat Formula

Sensible Heat Formula is for students to calculate sensible heat emitted into the atmosphere. This formula called Sensible Heat Formula will help students find out the value of emission of a specific type of heat called sensible heat.

## What is sensible heat?

Sensible heat is a type of energy that is either received or released into the atmosphere. Sensible heat is only concerned with changes in the temperature of gases or materials, not with phase shifts. The transition between the solid, liquid, and gas phases has an impact on latent heat. The air flow in an electric furnace is calculated using the Sensible Heat Formula.

### Sensible Heat Formula

The Sensible Heat Formula can be written as Qsensible= 1.10 x cfm x (to – ti).

Here, the symbols represent

Qsensible = Heat gain from outside in Btu/h

1.10 = product of heat capacity of air 0.018 Btu/oF

Cfm = rate of flow of air entering from outside

to= Temperature outside in oF

ti = Temperature inside in oF

### Sensible Heat Examples

Some examples of the Sensible Heat Formula can be found as follows, but the students must first understand the SI unit of the Sensible Heat Formula. When air is heated or cooled, the sensible heat involved (also known as the heating or cooling capacity) can be computed in SI units as

hs = cp ρ q dt

where

hs = sensible heat (kW)

cp = specific heat of air (1.006 kJ/kg oC)

ρ = density of air (1.202 kg/m3)

q = air volume flow (m3/s)

dt = temperature difference (oC)

Whereas in Imperial units as

hs = 1.08 q dt

where

hs = sensible heat (Btu/hr)

q = air volume flow (cfm, cubic feet per minute)

dt = temperature difference (oF)

### Sensible Heat vs. Latent Heat

The primary distinction between sensible and latent heat is that sensible heat will either cause an increase in temperature or a reduction in temperature. The temperature change in latent heat will be continuous and unchanging.