#### 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 P_{1} and if you know boiler efficiency - η,
calculator gives you required actual heat power from combustion
like P_{1}/ 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
- ṁ
- 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
- P
_{1} - actual heat power

- Select value to input. Not selected one will be calculated.
- q
- volume flow rate
- ṁ
- 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.