Burner and fuel consumption rate

[MTGreen]

I don't know how to determine the fuel consumption rate of a gas burner and would like to seek for help.
Also, is there any relationship between the number of rings of gas burner and the fuel consumption rate?

 

[russ_watters]

Welcome to PF!

Rings? What rings? Yes, we can help, but you'll need to be more descriptive.

 

[MTGreen]

Hi russ, I'm referring to the cast iron ring stove burner (or ring gas burner).

 

[MTGreen]

When we purchase a gas burner stove, it comes with a heat value like in MJ/hr. I wonder how this value comes from and how could it be determined.

 

[russ_watters]

Hi russ, I'm referring to the cast iron ring stove burner (or ring gas burner).

Like this?:

Yes, a larger burner will generally use more gas to produce more heat.

When we purchase a gas burner stove, it comes with a heat value like in MJ/hr. I wonder how this value comes from and how could it be determined.

It comes directly from the energy capacity of the fuel. If we're talking about natural gas, it has an energy density of 56 MJ/kg. https://en.wikipedia.org/wiki/Energy_density#Energy_densities_ignoring_external_components

Figure 70% combustion efficiency and about 50% heat transfer efficiency (that one can vary a lot) and you can easily calculate the fuel flow rate based on desired heating.

 

[CWatters]

Here in the UK gas rings are usually rated in Watts (Actually in kW). To work out the rate of gas consumption you have to know the energy density of the fuel as Russ said.

 

[MTGreen]

Russ,
Yes, the figure shows the burner that I'm talking about.
So, if we use energy density (MJ/kg) to calculate fuel consumption rate (MJ/hr), it means that we need to know the fuel flow flate (kg/hr).
However, how could we determine this fuel flow rate?

 

[MTGreen]

Is it related to the flowrate provided by the power company?
If yes, then how to determine the fuel flowrate for stoves with 2 and 3 rings?
As more the number of rings, the higher is the fuel consumption rate.
Thank you for your help!

 

[CWatters]

There are three variables...
Power
Flow rate
Energy density

If you know any two you can work out the third. Which two do you know?