Heating Ventilating and Air Conditioning

Physics

Electromagnetic Radiation

# What is the formula for heat loss calculation in insulations?

###### Wiki User

###### August 04, 2007 8:27PM

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatcond.html

## Related Questions

###### Asked in Industrial Engineering, Mechanical Engineering

### What is formula for boiler efficiency?

boiler efficiency
calculation methods:
Input-output method
η = Output / Input
Output is defined as the heat that is absorbed by working fluid.
Input is defined as the chemical heat of fuel plus the heat that is
added to working fluid, air, gas and other fluid circuit in which
the fluid circuit across thin layer.
Heat Loss Method
Heat loss method is the method that is used to calculate the
percentage amount of heat which is not useful. This method is very
effective used in an attempt to find potential savings of boiler
with heat balance.
There are several factors act as the source of heat loss
combustion. These factors will be used to calculate boiler
efficiency based on heat loss method. The source of heat loss can
be seen as following below:
a. Heat loss due to dry flue gas
Heat loss due to dry flue gas is the heat loss which is
contained in dry flue gas such as CO2, O2 and N2. These gases are
one of causes of heat loss in combustion process. The high
temperature of flue gas coming out from boiler affect amount of
heat loss.
The weight and heat loss of dry flue gas of combustion of coal
can be calculated as following formula:
Wdfg = mCO2 + mSO2 + mO2 + mN2
Eloss dfg = Wdfg x Cp x (To - Ts)
Where:
Wdfg = weight of dry flue gas (kg/kg coal)
Eloss dfg = heat loss in dry flue gas (kJ/kg)
To = temperature of dry flue gas coming out from boiler
Ts = temperature of surrounding
by Gajanan Nalegaonkar

###### Asked in Physics

### What is heat gain and heat loss?

###### Asked in Geometry

### What is the relationship between heat loss and surface area?

Well,
If the surface area is small, say 1 m2 . And the temperature is
1000C
You lose only 2% of your heat.
But if the surface area is big/largel, say 10 m2 . And the
temperature is still 1000C
You lose only 20% of your heat.
So the bigger your surface area the bigger your heat loss
is.
Warning: It is a example, the calculation is not correct!

###### Asked in Math and Arithmetic, Geometry

### What is the formula for the R - value?

simply put r-value= temperature differenceXareaXtime/heat
loss
the standard uses 75degrees on one side of a substance and the
heat loss is measured across the substance this heat loss is then
quantified by a temperature measurement of the noon standard
temperature this becomes the temperature difference in the
equation. the area is just that, in square feet and the time is in
hours and the heat loss in Btu's.
you
dandan the heatin man