# How to calculate a gas burner dimensions?

I am trying to calculate the dimesnions of a natural gas burner for a hospital. The burner will be heating water. I have calculated the thermal duty that needs to be produced and the water mass flow, but I haven't found equations that will allow me to calcuate any characteristics of the final construction.

My approach so far is treating the burner as if it was a gas CSTR. The problem is that I havent really found any literature doing the same thing, so I doubt that this apporach is right.

Does anyone know of the relative literature for my problem or has to suggest any tactic I should use?

• I think you guesstimate the total BTU you want and ask for bids from vendors. They will likely calculate BTU requirements on their own. I know from refineries there are dramatically different type of burners when you get to industrial applications. Dec 12, 2020 at 22:27
• Thanks for your comment @blacksmith37! However my goal is go calculate the size myself because I need to present the ideal burner. Choosing a burner from the market is a step afterwards. Dec 12, 2020 at 22:41
• I would have thought the "ideal burner" is the number of BTUs you need, given the likely efficiency of the heat exchanger. Obviously a heat exchanger that is 40% efficient will need twice as much heat input as one that is 80% efficient. I really don't see what a CSTR has to do with the calculation. Dec 13, 2020 at 3:34
• Burner and boiler design ist also determined by teat transfer and managing the flame temeprature. Just talk to vendors already.
– mart
Dec 13, 2020 at 20:30
• And what makes you believe the ideal solution is a burner and not multiple? You must spread fuel and air, mixing them and igniting them. A huge blob of fuel will be suboptimal. A jet engine would be too far optimized for generating mechanical power in the form of pressure and flow (you only need the thermal heat). In addition, don't forget that a hospital cannot have any downtime so maybe something where 5 units, of which any one can be taken down for maintenance while still meeting needs with 4, would be better?
– Abel
Aug 31, 2023 at 1:23