Author Question: How is net stack temperature determined? What will be an ideal ... (Read 13 times)

serike · **on:** Jul 26, 2018

How is net stack temperature determined?

What will be an ideal response?

Question 2

Calculate the amount of heat in BTUs required to change 5 pounds of 10F ice to 242F steam?

What will be an ideal response?

fdliggud · **Reply #1 on:** Jul 26, 2018

Answer to Question 1

Stack temperature - ambient temperature = net stack temperature

Answer to Question 2

The heat required to increase the temperature of 5 pounds of ice from 10F to

32F is calculated using the specific heat formula:

BTUs = pounds x F T x specific heat capacity in BTU per pound.

BTUs=5 lb x 22 x 0.5 = 55 BTUs

The heat required to melt 5 pounds of ice is calculated using the latent heat

formula:

BTU = weight x latent heat factor

BTU= 5 x 144 = 720 BTUs

The heat required to increase the temperature of 5 pounds of water from 32F

to 212F is calculated using the specific heat formula:

BTUs = pounds x F T x specific heat capacity in BTU per pound.

BTUs=10 lb x 180 x 1 = 1800 BTUs

The heat required to boil 5 pounds of water is calculated using the latent heat

formula:

BTU = weight x latent heat factor BTU= 5 x 970 = 4850 BTUs
The heat required to increase the temperature of a pound of steam from 212F to 242F is calculated using the specific heat formula:

BTUs = pounds x F T x specific heat capacity in BTU per pound. BTUs=5 lb x 30 x 0.5 = 75 BTUs
Finally, sum the results

55 BTUs + 720 BTUs + 1800 BTUs + 4850 BTUs + 75 BTUs = 7500 BTU