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btu calc question

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Posted by rcam001@hotmail.com on February 15, 2009, 9:36 am
 
Hi All

My solar air heater moves 1250 cfm of air. One day in Jan it ran for 6
hrs and the average temp increase from cold side to hot was 13.7 deg
F....how many BTU's did I produce?

TY
rob

Posted by lemur on February 15, 2009, 9:50 am
 
Hi All

My solar air heater moves 1250 cfm of air. One day in Jan it ran for
6
hrs and the average temp increase from cold side to hot was 13.7 deg
F....how many BTU's did I produce?


TY
rob



Posted by schooner on February 15, 2009, 10:32 am
 

http://www.builditsolar.com/References/Measurements/CollectorPerformance.htm  


Posted by Ron Rosenfeld on February 15, 2009, 7:01 pm
 On Sun, 15 Feb 2009 01:36:38 -0800 (PST), "rcam001@hotmail.com"


http://www.builditsolar.com/References/Measurements/CollectorPerformance.htm#AirCollector

BTU = Volume of Air * Air Density * (Temp increase) * specific heat of air

Specific heat of air is 0.24 BTU/lb-F

Approximately 100,000 BTU.  The calculation depends on the air density at
the collector.  That depends on altitude and temperature.  I'm guessing
0.065 lb/ft^3

--ron

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