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JRMichler · 06-07-16, 08:29 PM

I use 0.018 BTU/ft^3/deg F, the same as bmxeroh. It's almost certainly more accurate than typical temperature and airflow measurements. A one degree error on inlet and outlet temperatures could cause 10% error on temperature rise, plus another 10% air flow error, results in an easily believable 20% error. Accurate BTU measurements in HVAC systems can be a real challenge.

The largest assumption is that you are not adding or removing moisture. Then you would need a psychrometric chart.

06-07-16, 08:29 PM	#5
JRMichler Apprentice EcoRenovator Join Date: Apr 2012 Location: Phillips, WI Posts: 109 Thanks: 10 Thanked 30 Times in 25 Posts	I use 0.018 BTU/ft^3/deg F, the same as bmxeroh. It's almost certainly more accurate than typical temperature and airflow measurements. A one degree error on inlet and outlet temperatures could cause 10% error on temperature rise, plus another 10% air flow error, results in an easily believable 20% error. Accurate BTU measurements in HVAC systems can be a real challenge. The largest assumption is that you are not adding or removing moisture. Then you would need a psychrometric chart.