The discussion focuses on calculating the British Thermal Units (BTU) gain from a fireplace heat scavenger with an 80 Cubic Feet per Minute (CFM) blower. Using the formula BTU/hr = 1.082 x CFM x ΔT, where ΔT is the temperature difference between the output and input temperatures, the output temperature is stated as 350 degrees Fahrenheit and the input temperature as 70 degrees Fahrenheit. This results in a temperature difference (ΔT) of 280 degrees Fahrenheit, leading to a calculated BTU/hr output of 1,000.8 BTU/hr.
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https://www.engineeringtoolbox.com/air-properties-d_156.html said:
- Specific heat capacity (Cv) air at 0°C and 1 bara: 0.7171 kJ/kgK = 0.17128 Btu(IT)/(lbm °F) or kcal/(kg K)