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
Homeostasis is analogous to regulation of temperature via a thermostat.
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