Fuel Rates

The units of BTU/Bhp-hr is energy over energy units. The kg/kW-hr is mass over energy units.

You just need to convert BTU to kg using your lower calorific value.

I am not sure about trying to equate the BTU/BHp-Hr to Kg/Kw-Hr but if what you really wish to know is how many Kg of gas you need to produce the same amount of energy there is in a Kw-Hr then the missing thing is 1 Joule is the amount of energy you use if you use 1 Watt for 1 Second therefore

1KWHr = 1,000 Watts x 3,600 seconds = 3,600Kj = 3.6Mj

And if you wish to know how much gas is need to do this then

3,600Kj ÷ 46,500Kj/Kg = 0.0774Kg = 77.4g

If that's knot what you wish to know pleas give us some more details about what your are trying to equate and where the BTU/BHp-Hr comes from.

bhp when talking about fuel usually means boiler horsepower or 33,523.7 btu/hr (btuh) (that's the number I have, although different sources give slightly different values. 33,500 btuh is a good estimate). Most firetube boilers are rated in boiler horsepower. 1 bhp will produce about 34 pounds (lbs) of steam per hour which could drive a 1 hp steam engine. The actual btuh rating of bhp has changed over time

Most watertube boilers are rated in lbs-steam/hr output. Small hot water boilers are rated in output btuh.

A kilowatt-hr is equal to 3412 btu.

1 kg = 2.205 lbs

You need to know what the btu content is per lb of fuel to convert to kilograms. Fuel oil #2 is about 19,000 btu/lb (actual amount depends on th source)

However, if you are talking about boiler horsepower, the boiler efficiency has to be taken into consideration as a boiler's BHP rating is based on output. Nominally 80% is used for boiler efficiency when calculating fuel rate (i.e. 33,500 btuh/.80). If it is desired to be more accurate, the efficiency of the boiler at the conditions it will be operated needs to be determined.

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Best of luck

crm:

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