Thermal Numeracy: Difference between revisions
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Thermal numeracy refers to understanding the quantities of heat produced, emitted, and transferred in various physical phenomena. | Thermal numeracy refers to understanding the quantities of heat produced, emitted, and transferred in various physical phenomena. | ||
*BTU - 1 lb water raise by 1 degree F | |||
*BTU of wood is 8k-9k per lb -[http://extension.oregonstate.edu/lincoln/sites/default/files/home_heating_fuels_ec1628-e.pdf] | |||
*U value of insulation is BTU/(hr*sq ft*deg F). It is the inverse of R value - [http://bwgreenhouse.ca/R-valueU-value.html] | |||
*Fireplace heat loss from chimney can be 80-90% - [https://indianamichiganpower.com/save/eNewsletter/ViewStory.aspx?StoryID=178] | *Fireplace heat loss from chimney can be 80-90% - [https://indianamichiganpower.com/save/eNewsletter/ViewStory.aspx?StoryID=178] | ||
*At high temperatures, temperature in degrees F is about 2x that of degrees C. Specifically, ~9/5 times. | *At high temperatures, temperature in degrees F is about 2x that of degrees C. Specifically, ~9/5 times. | ||
*Glenwood 5000 stove is rated for 100k BTU, with 11 sf of heat exchange area - about 10k BTU/SF | *Glenwood 5000 stove is rated for 100k BTU, with 11 sf of heat exchange area - about 10k BTU/SF | ||
*1 kW ~ 3000 BTU/hr | *1 kW ~ 3000 BTU/hr | ||
*Black pipe is only $12/square foot (10k BTU) of heat exchange area using 1" pipe! -[https://docs.google.com/presentation/d/1xTUzDwmhszU4VwrCzDTLW_LENnYHIbPXisFgCwlOvg4/edit#slide=id.g6773fc365_0_0] | *Black pipe is only $12/square foot (10k BTU) of heat exchange area using 1" pipe! - [https://docs.google.com/presentation/d/1xTUzDwmhszU4VwrCzDTLW_LENnYHIbPXisFgCwlOvg4/edit#slide=id.g6773fc365_0_0] | ||
*1/2" PEX power production - 22 BTU/hr for 1 foot of length - [http://www.pexuniverse.com/content/pex-tubing-sizes-floor-output]. 500 feet per trough = 11k BTU | |||
*Cord of wood is $235, and 4000 lb - [https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8&client=ubuntu#q=how%20much%20does%20a%20cord%20of%20wood%20cost] | |||
*Thermal expansion coefficient of water is 1/10000 for F - [http://www.engineeringtoolbox.com/cubical-expansion-coefficients-d_1262.html] | |||
Latest revision as of 01:31, 1 December 2015
Thermal numeracy refers to understanding the quantities of heat produced, emitted, and transferred in various physical phenomena.
- BTU - 1 lb water raise by 1 degree F
- BTU of wood is 8k-9k per lb -[1]
- U value of insulation is BTU/(hr*sq ft*deg F). It is the inverse of R value - [2]
- Fireplace heat loss from chimney can be 80-90% - [3]
- At high temperatures, temperature in degrees F is about 2x that of degrees C. Specifically, ~9/5 times.
- Glenwood 5000 stove is rated for 100k BTU, with 11 sf of heat exchange area - about 10k BTU/SF
- 1 kW ~ 3000 BTU/hr
- Black pipe is only $12/square foot (10k BTU) of heat exchange area using 1" pipe! - [4]
- 1/2" PEX power production - 22 BTU/hr for 1 foot of length - [5]. 500 feet per trough = 11k BTU
- Cord of wood is $235, and 4000 lb - [6]
- Thermal expansion coefficient of water is 1/10000 for F - [7]