measuring unit

[leonardo110389]

Hello everyone by scrolling a book today I found this unit of measure:

nm3/bkw-hr​

Can someone tell me what it means and how can I express it in yes?
Thank you.

 

[numero1]

I gamble an answer, without any source that gives me that.

nm3 = newton per cubic meter
bkw = british kilowatt now
hr = horse (steam horses) even if I have always seen hp

What book did you find that terminology?

 

[meccanicamg]

what formula are they talking about? What context is it? Isn't that a writing error?

 

[meccanicamg]

I think we are talking about some units of measurement of the international system and other unfair writings. I think you're talking about energy performance or similar. the units of measurement are about those... See page 29 http://www.cspmi.it/content/5457.pdf

 

[paulpaul]

Hello everyone by scrolling a book today I found this unit of measure:

nm3/bkw-hr​

Can someone tell me what it means and how can I express it in yes?
Thank you.

Hi.

It is a common expression to indicate the specific consumption of a natural gas powered engine (or the reverse of the specific consumption of a gas compressor).

nm3: indication is not to indicate normal m3, i.e. m3 reported to normal conditions (atmoseric pressure and 0 °c)
bkw: idem as above, but to indicate the brake power (brake)

the unit of time to call (it should indicate h and non hr) indicates a volume flow (nm3/h).

the formula can therefore be read as the flow (in "nm3/h") necessary for each kw of power to the brake or also as the necessary gas volume (nm3) for each kwh of mechanical energy "produced" from the engine. Basically, if you know engine absorption (in "bkw") you can calculate gas consumption (in nm3/h). is a value reported on the catalogs of motor builders, and varies according to different parameters, the most important of which are the load, the speed, the ambient temperature - and thus written - also the calorific power of the fuel.

should be correctly written as m3/kwh, specifying apart the reference conditions of m3 and kw: for convenience it is used n and b.

multiplying the numberer for the heat power of the fuel (referred in this case to nm3) you get the reverse of the engine performance, adimensional.

Hi.

 

[tartufon80]

Hi.

It is a common expression to indicate the specific consumption of a natural gas powered engine (or the reverse of the specific consumption of a gas compressor).

nm3: indication is not to indicate normal m3, i.e. m3 reported to normal conditions (atmoseric pressure and 0 °c)
bkw: idem as above, but to indicate the brake power (brake)

the unit of time to call (it should indicate h and non hr) indicates a volume flow (nm3/h).

the formula can therefore be read as the flow (in "nm3/h") necessary for each kw of power to the brake or also as the necessary gas volume (nm3) for each kwh of mechanical energy "produced" from the engine. Basically, if you know engine absorption (in "bkw") you can calculate gas consumption (in nm3/h). is a value reported on the catalogs of motor builders, and varies according to different parameters, the most important of which are the load, the speed, the ambient temperature - and thus written - also the calorific power of the fuel.

should be correctly written as m3/kwh, specifying apart the reference conditions of m3 and kw: for convenience it is used n and b.

multiplying the numberer for the heat power of the fuel (referred in this case to nm3) you get the reverse of the engine performance, adimensional.

Hi.

Good morning!

looking on the net to try to understand what asked leonardo110389, I came across this file, in which he finds the unit of measurement reported by him.
trying to give me an explanation for the bkw (I didn't know) I found this page on wiki, going back to the brake power.
But I couldn't understand that "hr."... thank you for the paulpaul explanation!! :finger:

 

[paulpaul]

Good morning!

looking on the net to try to understand what asked leonardo110389, I came across this file, in which he finds the unit of measurement reported by him.
trying to give me an explanation for the bkw (I didn't know) I found this page on wiki, going back to the brake power.
But I couldn't understand that "hr."... thank you for the paulpaul explanation!! :finger:

Don't worry.
I had in mind the caterpillar engines, with which I had to deal relatively often!
one of the things that most makes me "imbestialire" is the inaccuracies on units of measurement, especially in official documents of important builders (as in this case): It doesn't take much to be precise (symbols, capital and tiny in the right place)!
...and then you should implement in this forum the ability to write the formulas correctly! :tongue:

 

[tartufon80]

Don't worry.
I had in mind the caterpillar engines, with which I had to deal relatively often!
one of the things that most makes me "imbestialire" is the inaccuracies on units of measurement, especially in official documents of important builders (as in this case): It doesn't take much to be precise (symbols, capital and tiny in the right place)!
...and then you should implement in this forum the ability to write the formulas correctly! :tongue:

I agree, we should be more correct. Obviously not to all captain prof rompip... and to school. :biggrin:
for formulas would really help, alternatively you can make some screenshots from the word microsoft equation, at least in the case of formulas of a certain type.
The fact remains, as you said, that looking around even great builders do a little as they seem... :bekle: