Definition of Heat Outputs

[Mechwill]

Hi everyone,

I understand it sounds very fundamental. I am working on a small low pressure boiler design. To find out what the BTU output is, I am familiar with Q=m*cp*delta_T. The water inlet and outlet temperatures have been measured as well as the water flow rate. This will give you a general ideal of the heat exchange rate of this boiler.

However, there is another way to determine the heat output ant that is by analyzing the exhaust emission, which provides the data of efficiency, flue temperature, net temperature, and etc. Using these data, the heat input and output can also be calculated.

The questions I have is that is there a direct relationship between these two heat outputs?

Does the efficiency that shows from the emission analyzer mean the efficiency of the boiler?

 

[berkshire]

You would also have to have the fuel input to the boiler as well.
B.E.

You are judged not by what you know, but by what you can do.

 

[25362]

http://www.engineeringtoolbox.com/boiler-efficiency-d_438.html

 

[Mechwill]

Thanks a lot 25362