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https://www.e-education.psu.edu/egee102/node/2057
Inside temp = 70 ° F − Outside temp = − 43 ° F Δ T = 27 ° F. Now area is given, A is, we already calculated 80ft 2 and R-value is also given as 22 which is 22 ft 2 °F hour over BTU. Δ T = 27 ° F A = 80 f t 2 R = 22 f t 2 ° F h B T U. Now, heat loss, BTUs per hour, is …
https://www.energyvanguard.com/blog/converting-heating-and-cooling-loads-air-flow-physics
4.5 = (ft^3/1 minute) * (delta BTU/1 lb. of air) * (60 minutes/1 hour) * (1 lb. of air/13.35 ft^3) Above, the ft^3, minute, and lb. of air terms cancel, leaving 60/13.35, which equals 4.45, which is then rounded to 4.5. My goal in demonstrating this to students is so they can see what all is contained in that “4.5” vs.
https://www.atlenv.com/building-ventilation-the-proper-air-changes-per-hour-ach
The most common term used to refer to the amount of outside air that needs to be introduced into a building is Air Changes per Hour (ACH). The ACH can vary widely depending upon what is going on inside the building: for example – it is generally considered that 4 ACH’s is the minimum air change rate for any commercial or industrial building.
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http://www.descoenergy.com/pdf/HVAC%20Formulas.pdf
15 ft.3 of air to burn 1 ft.3 of methane produces: 16 ft.3 of flue gases: 1 ft.3 of oxygen 12 ft.3 of nitrogen 1 ft.3 of carbon dioxide 2 ft.3 of water vapor Another 15 ft.3 of air is added at the draft hood GAS PIPING (Sizing – CF/hr.) = Input BTU’s Heating Value Example: ___ 80,000 Input BTU’s_____ 1000 (Heating Value per CF of Natural Gas)
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