BTU/hr calculation
BTU/hr calculation
(OP)
I have a small container that I am looking to purchase a heater for that I can adjust the temp. Can someone help me with calculation for required BTU/hr? Details below.
Surface Area: 9.388 ft2
Room Temp: 70F
Desired temp in container: up to 750F
Well insulated.
Mcmaster Carr says this but it doesn't make sense (unit wise) to me. It would be saying ft2*F=BTU/hr????
Step 1: Determine the surface area of your floor, walls, and ceiling in square feet:
(2 x length x width)+(2 x length x height)+(2 x width x height)
Step 2: Estimate your heat loss factor by choosing the description that best fits your building:
Very well sealed and insulated = .25
Well sealed, but not insulated = .75
Not well sealed or insulated = 1.25
Step 3: Decide how much you want the temperature to rise in ° F:
If you don't currently have interior heat this would be the difference between the outside temperature and your desired temperature. If adding to existing heat this would be the difference between your current temperature and your desired temperature.
Step 4: Multiply the results from steps 1-3 for your estimated Btu/hr. requirement. You may need to consider more than one heater to meet your total requirement.
Surface Area: 9.388 ft2
Room Temp: 70F
Desired temp in container: up to 750F
Well insulated.
Mcmaster Carr says this but it doesn't make sense (unit wise) to me. It would be saying ft2*F=BTU/hr????
Step 1: Determine the surface area of your floor, walls, and ceiling in square feet:
(2 x length x width)+(2 x length x height)+(2 x width x height)
Step 2: Estimate your heat loss factor by choosing the description that best fits your building:
Very well sealed and insulated = .25
Well sealed, but not insulated = .75
Not well sealed or insulated = 1.25
Step 3: Decide how much you want the temperature to rise in ° F:
If you don't currently have interior heat this would be the difference between the outside temperature and your desired temperature. If adding to existing heat this would be the difference between your current temperature and your desired temperature.
Step 4: Multiply the results from steps 1-3 for your estimated Btu/hr. requirement. You may need to consider more than one heater to meet your total requirement.





RE: BTU/hr calculation
So the equation works out to BTU/HR
It looks like you will need 1,596 BTU/Hr
RE: BTU/hr calculation
perhaps a little further explanation of the situation will result is better responses.
good luck!
-pmover
RE: BTU/hr calculation
What I have is a rectangular box with a smaller 2.5 in. diameter tube attached (about 3 ft. long). The air will be blown into the rectangular box through the tube and out to the room. I'm not sure what material I will use yet. My desired temp. will most likely not be that high and I think will be too costly to make it to those standards. We will most likely blow only warm air though there to get a rough estimate of what is happening. (maybe 120F).
RE: BTU/hr calculation
RE: BTU/hr calculation
box volume is about 2880in3
what is the 1.08 in your equation?
RE: BTU/hr calculation
How fast is the air moving?
Your original posting implied something totally different than your last post is apparently saying.
TTFN
RE: BTU/hr calculation
It looks like you have 1.67 Ft^3 of volume and you are moving 105 CFM. That gives you 63 air changes per minute. I would say that regardless of your box material or insulation, if you introduce air at the desired temperature, you will be able to hold that temperature and conduct your tests.
Now to IRstuff's point, I still don't know what you are trying to accomplish either.
RE: BTU/hr calculation
basically what the system is trying to do is simulate the exhaust of a car. The box is the exhaust manifold and the pipe is the exhaust pipe. Heat affects our results (im not sure how much) so thats why i am looking into a heater. my initial thought was "lets get real temps" in the pipe and now I don't want the high costs of trying to acheive those results so i want maybe 120F. I would like to use plexiglass for the box now which can handle temps up to 250F I believe.
RE: BTU/hr calculation
RE: BTU/hr calculation
There are commercial heat guns used for shrinking shrink tube that should get plenty hot:
http://www.uline.com/ProductDetail.asp?model=H-491
Are you simulating the pulsations, the gas content?
TTFN
RE: BTU/hr calculation
IRStuff has requested clarification.
fyi, when unclear, vague, and/or ambiguous data is provided, the results are just the same. as you can note in the responses, they vary.
i'm considering in making a notification to have this posting removed; and request that you start anew (that is, be a little more explicit to what the situation is). in fact, i will make the notification.
please make future postings a little more clearer and concise so as to receive concise and clear responses.
meanwhile, good luck!
-pmover