Combustion thermal energy calculator

fuel energy to thermal power conversion

Description

You can use this calculator to calculate how much power you can get from burning a certain liquid or gaseous fuel. It is possible to use the calculator in the reverse sense, to calculate the required amount of fuel to obtain the required power.

The power that is the subject of the calculation is actually thermal energy per unit of time that is obtained by burning fuel and can be used for space heating or for technological needs in the process industry.

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And even more... Subscribed users have access to the full set of 19 calculators available as Java™ Web start application or download Windows™ 64bit application.

Full year subscription

Monthly cost
\$250/month

Full year subscription \$29.95/year

Action
Calculation setup
Combustion heat power
Fuel heat values and density
Flow rates

Exclusive calculator

On exclusive calculator page you can use the online calculator without interference from advertisements, additional text, links and other content that is not required for the calculations themselves. A pure experience of using a calculator as with a desktop application.

An exclusive version of the calculator is available to registered users. Choose the right subscription duration and start using the exclusive service.

Description

q - Volume flow rate
Fuel flow rate in terms of units of volume per unit of time
ṁ - Mass flow rate
Fuel flow rate in terms of units of mass per unit of time
P - Power - heat power
Energy needed for combustion in unit of time
P1 - Actual power
Useful heat energy - power after reduction due to energy losses in energy conversion from combustion heat to, for example, hot water heat energy
LHV_V - Heat value
Heat energy created during combustion in units of volume
LHV_G - Heat value
Heat energy created during combustion in units of mass
ρ - Density of fuel
This value is only required if you want to calculate flow rate or heat power in different units (as per unit of mass or volume).
η - Efficiency
Energy losses coefficient ratio between actual heat power and combustion heat power that represents efficiency of energy conversion.

Efficiency coefficient is used to represent losses in energy conversion from combustion energy to energy available for end use like hot water heat energy from boiler. If you have specified hot water heat energy demand P1 and if you know boiler efficiency - η, calculator gives you required actual heat power from combustion like P1/ η. You can select not to use this feature by selecting η in Omit section.

Calculation setup

Select value to calculate. You should input values for not selected one.
P
heat power calculation
fuel flow rate calculation
LHV_V/LHV_G
fuel heat value calculation
Select value to input. Not selected one will be calculated.
P
heat power
P1
actual heat power
Select value to input. Not selected one will be calculated.
q
volume flow rate
mass flow rate
Select value to input. Not selected one will be calculated.
LHV_V
lower heat value in terms of volume
LHV_G
lower heat value in terms of mass
Use η in calculation
for calculation of actual energy after energy losses in combustion process
Use ρ in calculation
for conversion between mass and volume

When is this calculator suitable?

You can use the calculator for calculation of heat energy (heat power) that fuel is releasing during combustion. The calculator is also suitable for inverse calculation. You can also calculate the fuel flow rate from available heat power.

Available calculation scenarios

1. Calculation of fuel flow rate for given heat energy (heat power).

This calculation scenario is the case when you want to know how much fuel is required to produce specified heat energy - power.

2. Calculation of heat energy (heat power) created from the combustion of the specified fuel flow rate.

This calculation scenario is the case when you know fuel flow rate, and you want to know how much heat energy that fuel can create during combustion.

3. Calculation of fuel heat value for given heat power and flow rate.

This calculation scenario is the case when you want to check the heat value (or quality of fuel) based on the specified flow rate and released heat energy - power.

What else has to be known to perform the calculation?

You can enter flow rates as the mass or volume flow rate. If you provide density value, the calculator calculates the flow rate that you didn't enter.

You can select if you want to have energy efficiency in calculation or not.

Efficiency coefficient is used to represent losses in energy conversion from combustion energy to energy available for end users like hot water heat energy from the boiler. If you have specified hot water heat energy demand P1 and if you know boiler efficiency - η, the calculator gives you required actual heat power from combustion like P1/ η.

You can select not to use this feature by selecting η in Omit section.

Calculator start selection

Read all about available deployments. In any way of utilizing calculator, Internet connection is not required, but nice to have for authentication at least.